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Journal articles on the topic 'Coloured acidic'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

G., S. SADANA, S. KUNHIPURAYIL P., and T. SANE R. "A Simple Extractive Colourimetric Determination of Pyrocyclidine Hydrochloride from Pharmaceutical Preparation using Food Colours." Journal of Indian Chemical Society Vol. 63, Feb 1986 (1986): 238–40. https://doi.org/10.5281/zenodo.6253273.

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Department of Chemistry, G. N. Khalsa College, Matunga, Bombay-400 019 Department of Chemistry, Ramnarain Ruia College, Matunga, Bombay-400 019 <em>Manuscript received 26 February 1985, accepted 15 November 1985</em> A simple colorimetric method for the estimation of procychdine hydrochloride from its pharmaceutical formulations is described. The method is based on the formation of coloured complexes by the drug with reagents, like sunset yellow. Carmoisine-S and Fast Red-E in acidic medium The coloured ion-pair complexes formed are quantitatively extracted under the experimental conditio

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2

Sanghi, Rashmi, and Bani Bhattacharya. "Comparative Evaluation of Natural Polyelectrolytes Psyllium and Chitosan as Coagulant Aids for Decolourization of Dye Solutions." Water Quality Research Journal 40, no. 1 (2005): 97–101. http://dx.doi.org/10.2166/wqrj.2005.009.

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Abstract The aqueous solutions of three different highly coloured anionic dyes (reactive, acidic and direct dyes), commonly used in the dyeing process, were studied for decolourization by coagulation. For optimum results the variables studied with polyaluminium chloride (PAC) were pH, dosage and temperature. Coagulation efficiencies of natural polyelectrolytes such as psyllium and chitosan alone or as coagulant aids in conjunction with PAC were studied and compared. In conjunction with a minimal dose of PAC, chitosan and psyllium were found to be very effective for the decolourization of acidi

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3

Ibrahim, Amany M. A. "Charge transfer complexes of Schiff bases derived from 2-aminobenzothiazole with some acidic and nonacidic acceptors." Canadian Journal of Chemistry 71, no. 3 (1993): 318–24. http://dx.doi.org/10.1139/v93-047.

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When Schiff bases derived from 2-aminobenzothiazole were reacted with di- and trinitrobenzene derivatives as acidic and nonacidic acceptors in the ratio of 1:1, stable coloured charge transfer complexes (CTC's) were obtained. The structure and stoichiometry of the CTC's were studied by elemental analysis.as well as by electronic absorption and infrared and nuclear magnetic resonance spectra. The CTC's derived from nonacidic acceptors were stabilized via intermolecular π–π* and n–π* transitions while those derived from acidic acceptors were formed by intermolecular π–π* transitions and a proton

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4

Stiborová, Marie, Befekadu Asfaw, and Pavel Anzenbacher. "Ce(IV)-mediated formation of benzenediazonium ion from a non-aminoazo dye, 1-phenylazo-2-hydroxy-naphthalene (Sudan I) and its binding to DNA." Collection of Czechoslovak Chemical Communications 54, no. 7 (1989): 2021–26. http://dx.doi.org/10.1135/cccc19892021.

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Ce(IV) ions in acidic medium convert a carcinogenic non-aminoazo dye, 1-phenylazo-2-hydroxy-naphthalene (Sudan I) into an ultimate carcinogen, which binds to calf thymus DNA. The principal product of Sudan I oxidation by the Ce(IV) system is the benzenediazonium ion. A minor product is the dihydroxyderivative of Sudan I, 1-(4-hydroxyphenylazo)-2,6-dihydroxynaphthalene. Other minor coloured products (yellow and brown) were not identified. The principal product (the benzenediazonium ion) is responsible for the carcinogenicity of Sudan I, as it covalently binds to DNA. Ce(IV) ions in acidic mediu

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Suvardhan, K., S. Ramanaiah, K. Suresh Kumar, et al. "Spectrophotometric Determination of Chromium in Water, and Pharmaceutical Samples Using 1-Naphthol." E-Journal of Chemistry 2, no. 1 (2005): 6–14. http://dx.doi.org/10.1155/2005/140534.

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Facile and sensitive spectrophotometric methods for the determination of trace and ultra trace amounts of chromium (VI) are described. 4-aminoantipyrine (APP) reacts with 1-naphthol (NPL) in presence of oxidising agent potassium dichromate in acidic medium to produce red coloured product having λmaxof 485 nm. The molar absorptivity and Sandell's sensitivity were 2.07x104l mol-1cm-1and 0.00240 μg/cm2respectively. The colour is stable for more than 6 h. The system obeys Beer's law in the range, 2-18 μg for determination of chromium (VI). The detection limits of chromium (VI) is 0.048 μg mL-1. Th

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6

Ragnar, M., T. Eriksson, and T. Reitberger. "Detection of Radicals Generated by Strong Oxidants in Acidic Media." Holzforschung 53, no. 3 (1999): 285–91. http://dx.doi.org/10.1515/hf.1999.048.

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Summary A new method to study superoxide and hydroxyl radicals in aqueous solution in the pH range 1 to 6 is described and critically evaluated. The method primarily detects superoxide, which reacts with tetranitromethane (TNM) by reductive cleavage. The strongly coloured nitroform anion (ε350nm = 15000M−1 cm−1) formed, is easily measured in a spectrophotometer or in a stopped-flow equipment. Hydroxyl radicals are measured indirectly. In a first step the hydroxyl radical reacts with iso-propyl alcohol to give acetone and superoxide. The superoxide formed is then in a second step detected with

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7

Wathon, Muhammad Hizbul, Endang Susilowati, Sri Retno Dwi Ariani, and Latifah Sari. "Complexation and Colour Stability of Anthocyanins from the Extracts of Java Plum Fruits (Syzygium cumini) with Selected Metal Cations (Al3+, Fe3+, and Ca2+) at Various pHs." Science and Technology Indonesia 10, no. 1 (2025): 43–55. https://doi.org/10.26554/sti.2025.10.1.43-55.

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Anthocyanins are highly coloured polyphenols, a class of flavonoids, which are natural, non-toxic, and water-soluble compounds. Because of that, anthocyanins have been used in numerous applications, such as natural colorants for foods, beverages, and textiles. However, anthocyanins have some drawbacks regarding their stability towards temperature, pH, and light, leading to degradation. One method to improve anthocyanins’ stability can be achieved through a complexation reaction of anthocyanins with metal cations. Thus, this study aimed to investigate the stability and colour profiles of anthoc

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8

Câmara, José S., Monica Locatelli, Jorge A. M. Pereira, et al. "Behind the Scenes of Anthocyanins—From the Health Benefits to Potential Applications in Food, Pharmaceutical and Cosmetic Fields." Nutrients 14, no. 23 (2022): 5133. http://dx.doi.org/10.3390/nu14235133.

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Anthocyanins are widespread and biologically active water-soluble phenolic pigments responsible for a wide range of vivid colours, from red (acidic conditions) to purplish blue (basic conditions), present in fruits, vegetables, and coloured grains. The pigments’ stability and colours are influenced mainly by pH but also by structure, temperature, and light. The colour-stabilizing mechanisms of plants are determined by inter- and intramolecular co-pigmentation and metal complexation, driven by van der Waals, π–π stacking, hydrogen bonding, and metal-ligand interactions. This group of flavonoids

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9

Cejpek, K., and J. Velíšek. "Advances in Chemistry of Isothiocyanate-derived Colourants." Czech Journal of Food Sciences 27, Special Issue 1 (2009): S207—S210. http://dx.doi.org/10.17221/1092-cjfs.

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This study is focused on the reactions of isothiocyanates (ITCs) in the presence of amino compounds leading to coloured structures <I>via</I> substituted 2-thiohydantoins. A series of complementary experiments has been done and appropriate reaction conditions and structural prerequisites have been defined. Low-molecular colourants isolated and characterised from the model systems can be sorted into three groups. Yellow to red diastereomeric dehydrodimers of 2-thiohydantoin derivatives that contain an acidic methylene group are formed in mixtures consisted of ITCs and amino acids wi

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10

(Miss), SWETA UPADHYAY, and K. GUPTA V. "Extractive Photometric Determination of Hydroxylamine." Journal of Indian Chemical Society Vol. 63, Aug 1986 (1986): 769–71. https://doi.org/10.5281/zenodo.6297694.

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Department of Chemistry, Ravishankar University, Raipur-492 010 <em>Manuscript received 25 March 1986, revised 21 July 1986, accepted 12 August 1986</em> An extractive spectrophotometric method is described for the determination of hydroxylamine. The colour reaction is based upon the well known diazotising and coupling reaction. Hydroxylamine is oxidised by iodine to nitrite, which diazotises with <em>p</em>-nitroaniline to form a diazonium salt, and then coupled with diphenylamine in acidic medium. The pink coloured chloroform extract dye has an absorption maxima at 540 nm. Beer's law is

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11

Fitriani, Dewi, Aprilia Donna Novitasari, and Lilies Wahyu Ariani. "UJI STABILITAS WARNA ANTOSIANIN EKSTRAK BUNGA TELANG PADA BERBAGAI PH DAN UJI POTENSI ANTIBAKTERI." Jurnal Buana Farma 4, no. 4 (2024): 388–94. https://doi.org/10.36805/jbf.v4i4.1188.

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Anthocyanins are flavonoid compounds that can be found in red, orange, purple, and blue coloured plants. The colour stability of these compounds is generally affected by temperature, pH and solvents. Anthocyanins tend to be stable at acidic pH and unstable at alkaline pH. Telang flower is a plant that has anthocyanin content. This anthocyanin content provides many benefits both in the health and food fields. The purpose of this study was to determine the effect of variations in solvent pH on the extraction of telang flowers on yield, extract pH, colour stability and to test antibacterial activ

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12

Bernaś, Emilia, and Grzegorz Fiutak. "The Influence of Pre-Treatment, Preservation Method, and Storage Time on Carotenoid and Chlorophyll Profile in Nettle Juices and its Relation to Colour Changes." Acta Universitatis Cibiniensis. Series E: Food Technology 27, no. 2 (2023): 199–212. http://dx.doi.org/10.2478/aucft-2023-0017.

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Abstract One of the most valuable health-promoting plants used in the production of functional, green drinks is nettle. Acidic environments, oxygen, high temperature, and enzymes can negatively affect the colour of green juices, which is an important aspect for consumers. Therefore, the study analyzed the effect of pre-treatment, preservation method (freeze-drying, freezing, sterilization), and storage on the profile of carotenoids and chlorophylls (HPLC) in nettles juices and its correlation with colour changes (CIELAB). All the examined parameters impacted the profile of both groups of compo

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13

Baker, P., D. Matthews, and A. Hope. "The Preparation and Characterization of Colloidal Polypyrrole." Australian Journal of Chemistry 47, no. 1 (1994): 1. http://dx.doi.org/10.1071/ch9940001.

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This paper describes the preparation and properties of colloidal polypyrrole. The polypyrrole was prepared by the oxidation of pyrrole with potassium persulfate in acidic, 25% aqueous, ethanol at 95°C. Absorption spectra showed that the reaction produced both unoxidized polypyrrole (ppy0) and oxidized polypyrrole ( ppy +), which were separated by precipitating the ppy + with water. The resulting ppy + was readily redispersed in ethanol to yield a strongly coloured , transparent, dispersion. Cyclic voltammetry of the dispersion yielded well defined peaks for reduction and reoxidation with a sta

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14

Mathew, Ceema, Shashikala Metri, C. Raja Vardhan, B. Lakshmi Prasanna, Shakapuram Neha, and Nekkanti Subash. "Ultra Sensitive Visible Spectroscopic Methods for Cefpodoxime Proxetil Using NQS and PDAC Reagents." International Research Journal of Pure and Applied Chemistry 25, no. 6 (2024): 134–44. https://doi.org/10.9734/irjpac/2024/v25i6891.

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Very sensitive and accurate visible spectrophotometric methods were developed and validated to quantify Cefpodoxime Proxetil in API and marketed formulation. Method A is based on the measurement of absorbance of a reddish-orange coloured chromogen at 454.9 nm, formed by the condensation reaction of the primary amino group of Cefpodoxime Proxetil with NQS reagent. Method B is based on the measurement of absorbance of a light yellowish green coloured chromogen at 401.3 nm, due to the Schiff’s base formed between Cefpodoxime Proxetil and PDAC reagent in acidic medium. Beer-lambert’s law is obeyed

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15

Revanasiddappa, H. D., and M. A. Veena. "Sensitive Spectrophotometric Methods for the Determination of Ascorbic Acid." E-Journal of Chemistry 5, no. 1 (2008): 10–15. http://dx.doi.org/10.1155/2008/714295.

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Two simple and sensitive spectrophotometric methods (A and B) have been described for the determination of ascorbic acid. Method A is based on the oxidation of ascorbic acid (AA) by known excess of Se(IV) in hydrochloric acid medium and subsequent determination of unreacted Se(IV) by reacting it with iodide in the same acid medium to liberate iodine, which react with starch to form a stable blue coloured iodine-starch complex, which shows maximum absorbance at 590 nm. Method B is based on the oxidation of ascorbic acid (AA) by known excess of Cr(VI) in sulphuric acid medium and the determinati

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16

Haneef, Jamshed. "Spectrophotometric Determination of Ampicillin Using Chromogenic Reagents (MBTH and PDAC) and their Application in Pharmaceutical Formulations." Journal of Pharmaceutical Research Science & Technology 7, no. 2 (2023): 54–61. http://dx.doi.org/10.31531/jprst.1000172.

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The present work highlights the spectrophotometric method development and validation for the assay of ampicillin, a broad-spectrum β-lactam antibiotic. Two methods have been proposed by employing popular chromogenic reagents viz 3-methyl 2-benzothiazolinone hydrazone (MBTH) and para dimethyl amino cinnamaldehyde (PDAC). Method A involves the coupling of ampicillin with MBTH in the presence of ferric chloride through the oxidative mechanism, resulting in the formation of green coloured solution with a maximum absorption peak at 620 nm. In method B, the condensation reaction of ampicillin with a

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17

Wathon, Muhammad Hizbul, Endang Susilowati, and Sri Retno Dwi Ariani. "Anthocyanins from Java Plum Fruits (<i>Syzygium cumini</i>) and Their Stability in Various pHs." Journal of Biomimetics, Biomaterials and Biomedical Engineering 62 (October 24, 2023): 51–61. http://dx.doi.org/10.4028/p-2wmfyn.

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Anthocyanins exhibit exciting colours in plants. Java plum fruit (Syzygium cumini) is considered a non-conventional and rarely consumed fruit with high levels of anthocyanins. This study was conducted to extract, purify, and characterise anthocyanins from dried Java plum fruits. The stability of anthocyanins was also studied. Anthocyanins in this study were extracted from dried Java plum fruits using acidified water (0.01% HCl, v/v) as a sustainable solvent. The crude extracts were loaded into a solid phase extraction (SPE) column packed with Amberlite-XAD-7HP with sequential elution. The etha

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18

Šopová, Barbora, and Matilda Zemanová. "Electrolytic colouring of anodized aluminium on tin basis." Acta Chimica Slovaca 12, no. 1 (2019): 8–13. http://dx.doi.org/10.2478/acs-2019-0002.

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Abstract The aim of the study was to find parameters of electrolytic colouring on tin basis to form uniform black coatings on anodized aluminium. A two steps electrolytic process consisting of aluminium anodization in a sulphuric acid electrolyte and colouring in tin acidic electrolyte was used. Among parameters influencing the colouring process, AC colouring voltage, composition of the counter electrode and agitation of the colouring electrolyte were studied. Spectrocolorimetry was applied to analyse the quality of the colouring. Thickness of the coloured and sealed anodized specimens was als

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G., Ramanjaneyulu, Raveendra Reddy P., Krishna Reddy V., and Sreenivasulu Reddy T. "Direct and derivative spectrophotometric determination of cobalt with 5-bromosalicylaldehydethiosemicarbazone." Journal of Indian Chemical Society Vol. 80, Aug 2003 (2003): 773–76. https://doi.org/10.5281/zenodo.5836488.

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Department of Chemistry, Sri Krishnadevaraya University, Anantapur-515 003, India <em>Manuscript received 16 June 1999, revised 11 February 2003, accepted 12 March 2003</em> A simple and sensitive spectrophotometric method is developed for the determination of cobalt in aqueous DMF medium. The metal ion forms a brown coloured complex with 5-bromosalicylaldehydethiosemicarbazone (5-BSAT) in acidic medium. The complex shows absorption maximum at 410 nm. Beer's law is obeyed in the range 0.29-5.89<em>µ</em>g ml<sup>-1</sup> of cobalt(ll). A method for the determination of cobalt by thir

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20

Wongkhantee, S., V. Patanapiradej, C. Maneenut, and D. Tantbirojn. "Effect of acidic food and drinks on surface hardness of enamel, dentine, and tooth-coloured filling materials." Journal of Dentistry 34, no. 3 (2006): 214–20. http://dx.doi.org/10.1016/j.jdent.2005.06.003.

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21

Hossain, M. F., and M. S. Islam. "Impact of Transplants Age on the Nutritional Quality of Cherry Tomatoes." Journal of Food and Agriculture 17, no. 2 (2024): 1–15. https://doi.org/10.4038/jfa.v17i2.5320.

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The age of transplants for planting in a local environment is important for better quality cherry tomato (Solanum lycopersicum var. cerasiforme) production. A field experiment was conducted during the winter (October 2023 to March 2024) to evaluate the effect of transplant age at the time of planting on fruit quality parameters (total soluble solids (TSS), moisture, ash, fiber, fat, pH, and vitamin C) in two cherry tomato varieties: BARI tomato-11 (red-coloured fruits) and Philippines variety (yellow-coloured fruits). Cherry tomato plants were cultivated at four different transplant ages (21,

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Pradeep, Mishra, and Garg Gopal. "Spectrophotometric estimation of aceclofenac in tablets." Journal of Indian Chemical Society Vol. 83, Jan 2006 (2006): 103–4. https://doi.org/10.5281/zenodo.5816517.

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Department of Pharmaceutical Sciences, Dr. H. S. Gour University, Sagar-470 003, Madhya Pradesh, India <em>E-mail</em> : pmishra51@rediffmail.com Fax : 91-7582-264236 <em>Manuscript received 28 July 2004, revised 7 January 2005, accepted 21 June 2005</em> A new simple, precise, highly specinc and economical spectrophotometric method for the determination of aceclofenac In Its pharmaceutical dosage forms has been developed. The method is based on the formation of a coloured complex of the drug with ferric nitrate In acidic medium, which has absorption maximum at 470 nm. Beer's Jaw is o

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Jignesh, B. Patel, and Sudhakar Padmaja. "Adsorption of anionic dyes on aluminium treated corn cobs powder." Journal of Indian Chemical Society Vol. 81, Jun 2004 (2004): 474–78. https://doi.org/10.5281/zenodo.5833417.

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Department of Applied Chemistry, Faculty of Technology & Engineering, The Maharaja Sayajirao University of Baroda, Kalabhavan, Vadodara-390 00 1, India <em>E-mail </em>: p_padmaja2001 @yahoo.com <em>Manuscript received 7 January 2002, revised 4 December 2003. accepted 13 January 2004</em> Untreated textile effluents are highly toxic as they contain a large number of metal complex dyes. The effluents discharged from various textile and dyeing industries are hazardous coloured effluents. The uptake of anionic dyes by aluminium treated corn cobs powder have been studied by batch technique. Ma

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Kaushish, Payal, Drishti D, Shagufta Jabin, Jyoti Chawla, and Priti Gupta. "Studies on Minimization of Pollutants from Sugar Industry Effluent by Using a Combination of Metal Coagulant and Polymer." Oriental Journal Of Chemistry 40, no. 3 (2024): 722–27. http://dx.doi.org/10.13005/ojc/400312.

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World is facing lot of health issues due to industrial wastewater pollution. Increasing population and industrialization are one of the main causes of water pollution. In general, industrial wastewater contains suspended, colloidal and dissolved impurities. Industrial effluent may be either excessively acidic or alkaline and may contain high concentration of coloured matter. In this study, coagulation-flocculation method has been used for minimization of contaminants from sugar industry effluent. Lime has been used in conjunction with poly diallyl dimethyl ammonium chloride (PDADMAC) for reduc

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Kuliev, K. A. Sultanzade S. S. Maharramova L. M. Melikova A. Y. Amanullayeva G. İ. "COMPLEX FORMATION IN A LIQUID-LIQUID EXTRACTION SYSTEM CONTAINING COBALT (II), 2, 6-DITIOL-4-ETYLPHENOL AND PHENANTROLINE." INDO AMERICAN JOURNAL OF PHARMACEUTICAL SCIENCES 05, no. 07 (2018): 6370–79. https://doi.org/10.5281/zenodo.1311173.

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<em>2,6-dithiol-4-ethylphenol (DTEP) has been synthesized and characterized with IR and NMR spectroscopic methods. A simple and spectrophotometric methods has been developed for the determination of trace amounts of cobalt (II). The reagents forms an blue coloured insoluble in water complex with cobalt (II) in acidic medium (pH 2.5-8.5). In the presence of hydrophobic amines form ternary complexes. As hydrophobic amine phenantroline (Phen) were used. The molar absorptivity of coloured species are 3.12×10<sup>4</sup> L.mol<sup>-1</sup> cm<sup>-1</sup>. Beer’s law is obeyed

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26

Borş, Andreea, Cristina Molnar-Varlam, and Melinda Székely. "The behaviour of composites, glass ionomers and compomers in erosive conditions – in vitro study." Acta Medica Marisiensis 60, no. 5 (2014): 200–203. http://dx.doi.org/10.2478/amma-2014-0042.

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Abstract Objective: The aim of this in vitro study was to evaluate the influence of erosive conditions on the wear resistance of aesthetic direct restorative materials. Methods: Six dental filling materials were tested: two composites (Filtek Z550 and X-tra fil), two compomers (Dyract Extra and Twinky Star) and two glass ionomers (Ketac Molar and Fuji II LC). Twenty disks (10mm×2mm) of each material were prepared (n=120) and kept in artificial saliva at 37˚C for 24 hours. Specimens were cycled in acidic soft drink (Coca-Cola) 5×/day, for 5’, over 30 days. Initial surface roughness ISR (Ra-μm)

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Guillaumin, Jean-Jacques, Chantal Riboulet, and Jean-Louis Gatien. "Epipactis exilis (Baumann et Baumann) Delforge, une espèce d’orchidée nouvelle pour l’Auvergne et pour la France / Epipactis exilis (Baumann et Baumann) Delforge, a new species of orchid for the Auvergne region and for France." Revue des sciences naturelles d'Auvergne 73, no. 1 (2009): 3–10. https://doi.org/10.3406/rsna.2009.1019.

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Epipactis exilis has been discovered on 30th June 2007 in the Auvergne region (commune Saint-Diéry, department Puy-de-Dôme). Hitherto, the species was known only in the Balkan peninsula, continental Italia and Sardinia. About at the same time as in the Auvergne (summer 2007), the species was also observed in the Cévennes (department Gard) by A. Gevaudan, a specialist of genus Epipactis. Epipactis exilis is the recent name for the ancient Epipactis gracilis Baumann & Baumann). It is included in subsectio Phyllanthes of sectio Euepipactis of genus Epipactis. Subsectio Phyllanthes is characte

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HĂISAN, BIANCA-MARIA, ALEXANDRA-GEORGIANA APOSTICĂ, and LAURA BULGARIU. "Quantitative Spectrophotometric Determination of Au(III) Ions in Aqueous Solution with Basic Violet 10 Dye." Buletinul Institutului Politehnic din Iași, Secția Chimie și Inginerie Chimică 70, no. 1 (2024): 23–34. https://doi.org/10.5281/zenodo.11145069.

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Spectrophotometric determination of Au(III) ions with Basic Violet 10 dye is a rapid, sensitive and accurate method that can be used in quantitative analysis. The colour reaction occurs immediately in acidic aqueous solution (pH = 0, HCl solution), and this represents an important advantage from a practical point of view. The qualitative parameters of coloured Au(III)-complex (maximum wavelength (500 nm), width of the spectral band (120 nm) and molar absorption coefficient (2.55·10<sup>4</sup> L·mol<sup>-1</sup>·cm<sup>-1</sup>)) suggest the possibility of using this react

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Okeniyi, F. A., and O. A. Osinowo. "Comparative morphology and ph of the alimentary tract in Archachatina marginata and Achatina achatina." Journal of Agricultural Research and Development 20, no. 1 (2021): 82–100. http://dx.doi.org/10.4314/jard.v20i1.8.

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A study was carried out to investigate the comparative morphology and pH of the gut in the Giant African Land Snails, in Archachatina marginata and Achatina achatina respectively. The crop is long, distended and less fleshy with reddish brown coloured juice (5.8 ml volume) in A. marginata, while it is short, compact and fleshy with greenish brown coloured juice (3.2 ml volume) in A. achatina. The digestive gland was heavier (17.36 vs. 15.74 g) in the latter than the former. The absolute weight of the crop in A. marginata was significantly (p<0.05) higher than in A. Achatina, however, the ab

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Shang, Yan, Changsheng Liu, Carlos Fernandez, et al. "The analysis and fabrication of a novel tin-nickel mixed salt electrolytic coloured processing and the performance of coloured films for Al-12.7Si-0.7Mg alloy in acidic and alkali corrosive environments." International Journal of Precision Engineering and Manufacturing 18, no. 1 (2017): 93–98. http://dx.doi.org/10.1007/s12541-017-0011-x.

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Browne, Kenneth A., Amy Chau, Janice Cline, and Maria Savage. "Impact of an unusual disulfide transformation on detection of isothermal amplification products." Canadian Journal of Chemistry 99, no. 1 (2021): 79–86. http://dx.doi.org/10.1139/cjc-2020-0302.

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Detection of infectious pathogens such as HIV-1, HPV, and SARS-CoV-2 from biospecimens is critical to healthcare. Particularly sensitive and specific diagnostic techniques to accomplish this include molecular amplification and detection tests of nucleic acids from pathogens. Such tests are comprised of reagent compositions to facilitate hybridization of primers and probes that are complementary to specifically amplified sequences of the analyte target. One of these reagents from an isothermal molecular assay occasionally changed its physical appearance over time, generating interest into the c

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M., Renuka, and Hussain Reddy K. "Spectrophotometric determination of mercury in water samples using 2,4-dihydroxyacetophenone acetoylhydrazone." Journal of Indian Chemical Society Vol. 91, Apr 2014 (2014): 751–56. https://doi.org/10.5281/zenodo.5718135.

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Department of Chemistry, Sri Krishnadevaraya University, Anantapur-515 003, Andhra Pradesh, India <em>E-mail </em>: khussainreddy@yahoo.co.in.com <em>Manuscript received 23 April 2013, revised 22 July 2013, accepted 12 September 2013</em> A very simple, highly selective, direct and non-extractive spectrophotometric method for the determination of trace amounts of mercury(II) is developed using newly synthesized 2,4-dihydroxyacetophenone acetoylhydrazone (DAAH). The reagent reacts with mercury(II) in a slightly acidic medium (pH 6.5, sodium acetate-acetic acid buffer) to form yellow coloured 1

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Ahern, CR, MMG Weinand, and RF Isbell. "Surface soil-pH map of Queensland." Soil Research 32, no. 2 (1994): 212. http://dx.doi.org/10.1071/sr9940213.

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Surface soil pH can influence biological activity, nutrition and various chemical processes in the soil. Low pH or acidity is causing major concern in southern Australia, prompting requests for details on the extent, severity and distribution of acidic soils in Queensland. By creating a soil pH database, using an appropriate base map, rainfall isohyets and GIS technology, a coloured pH map of surface soils was produced at a 1:5000000 scale for the entire State. As most samples were from virgin or little disturbed sites, the map generally reflects naturally occurring soil pH. Developed horticul

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Masaki, Yusei, Shin Ichi Hirano, and Naoko Okibe. "Microbial Community Structure Analysis of Blood Pond Hell Hot Spring in Japan and Search for Metal-Reducing Microbes." Advanced Materials Research 1130 (November 2015): 45–49. http://dx.doi.org/10.4028/www.scientific.net/amr.1130.45.

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Blood Pond Hell (Chinoike Jigoku) is located in the hot spring town of Beppu, in Kyushu Island of Japan, and features a unique hot, acidic, red-coloured pond. This study aimed to investigate the microbial diversity in this unique extreme environment and eventually to isolate useful acidophilic microbes. The initial PCR (using bacteria-or archaea-specific primers) on environmental samples detected the presence of bacteria, but not archaea. The following random sequencing analysis confirmed the presence of a large bacterial diversity at the site (123 clones comprising 18 bacterial and 1 archaeal

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Jelínek, František, Pavel Hron, and Františka Hozmanová. "Gastrointestinal Stromal Tumour in a Guinea Pig: a Case Report." Acta Veterinaria Brno 78, no. 2 (2009): 287–91. http://dx.doi.org/10.2754/avb200978020287.

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The objective of this contribution was to present a case report of gastrointestinal stromal tumour (GIST) in one guinea pig: a pet animal, male, 3.5 year of age, tricolour. Approximately for five weeks before death wasting, in spite of good appetite, decreased locomotor activity, soft and malodorous faeces were observed by the owner. The animal spontaneously died and at necropsy a grey-pink coloured tumour of walnut size located in the terminal segment of the ileum was observed. A solid malignant tumour of mesenchymal appearance was diagnosed histologically. One part of the sample consisted of

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K., M. Reddy, Suresh Kumar K., Suvardhan K., Krishnaiah L., and Chiranjeevi P. "Determination of fenitrothion in water samples by spectrometry using new reagents iminodibenzyl and 4-amino-5-hydroxy-2,7-naphthalene disulfonic acid." Journal of Indian Chemical Society Vol. 82, Aug 2005 (2005): 764–67. https://doi.org/10.5281/zenodo.5830318.

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Environmental Monitoring Section, Department of Chemistry, S. V. University, Tirupati-517 502, India <em>E-mail</em> : chiranjeevi_sai@yahoo.co.in <em>Manuscript received 26 September 2003, revised 27 September 2004, accepted 19 May 2005 </em> Simple and sensitive spectrophotometric methods for the determination of fenitrothion in either pure form or in its formulations are described. The methods are based on the diazotization of reduced fenitrothion followed by coupling with alcoholic iminodibenzyl (IDB) in acidic medium to give a purple coloured product having aƛ<sub>min</sub> of 575 nm

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Pignon, H., C. Brasquet, and P. Le Cloirec. "Coupling ultrafiltration and adsorption onto activated carbon cloth: application to the treatment of highly coloured wastewaters." Water Science and Technology 42, no. 5-6 (2000): 355–62. http://dx.doi.org/10.2166/wst.2000.0535.

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The aim of this work is to evaluate the efficiency of Activated Carbon Cloths (ACCs) as a refining treatment of membrane filtration in the case of effluent streams containing both dyes and suspended solids (SS) or colloids responsible for turbidity. It is divided into two parts. First, dye adsorption experiments are carried out. Kinetics and isotherms enable us to show the feasibility of the adsorption and to study the influence of different operating conditions. The results demonstrate that adsorption is enhanced under acidic conditions, the adsorption capacity being increased by 40% in some

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Nitare, J., A. M. Ainsworth, E. Larsson, et al. "Four new species of Hydnellum (Thelephorales, Basidiomycota) with a note on Sarcodon illudens." Fungal Systematics and Evolution 7, no. 1 (2021): 233–54. http://dx.doi.org/10.3114/fuse.2021.07.12.

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Four new Hydnellum species are described. Hydnellum roseoviolaceum sp. nov. grows in dry pine heaths on acidic, sandy soil. It is close to H. fuligineoviolaceum, another pine-associated species, but differs by smaller spores, an initially rose-coloured instead of violet flesh in fresh basidiomata and a mild taste. Hydnellum scabrosellum sp. nov. grows in coniferous forests on calcareous soil. It shares a general morphology with H. scabrosum, which also is its closest relative. It differs by having smaller and slenderer basidiomata and by the yellowish ochraceous colour of flesh and spines in d

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MAJEED, Haza Satar. "PARAMETRIC OPTIMIZATION OF DYES ABSORPTION USING POLYPROPYLENE IMINE DENDRIMER FROM TEXTILE WASTEWATER." MINAR International Journal of Applied Sciences and Technology 04, no. 02 (2022): 217–23. http://dx.doi.org/10.47832/2717-8234.11.25.

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Recently, Dendrimers are famous for monodispersed, highly branched, three dimensional, macromolecular nanoscopic architecture with several groups of the reactive end. Dendrimers work as dye removal agents from the two systems liquid-solid or liquid-liquid. This study tackles the textile dyes removal from aqueous solutions by Reactive Black 5 (RB5), Acid Blue 7 (AB7), Reactive Red 198 (RR198), Acid Green 25 (AG25), poly (propylene imine) dendrimer (PPI). and have been utilized as model dyes. Operational parameters influence the removal of dye like the concentration of dye, the concentration of

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Earle, J. Chris, Hamish C. Duthie, and David A. Scruton. "Analysis of the Phytoplankton Composition of 95 Labrador Lakes, with Special Reference to Natural and Anthropogenic Acidification." Canadian Journal of Fisheries and Aquatic Sciences 43, no. 9 (1986): 1804–11. http://dx.doi.org/10.1139/f86-224.

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Phytoplankton abundances and accompanying morphometric, physical, and chemical data from 95 Labrador lakes were subjected to statistical analysis to determine the structure of the phytoplankton communities and to relate environmental factors to the patterns observed. Factor analysis of the 22 measured physical and chemical variables reduced the data to six derived environmental factors: hardness, dystrophy, lake size, salinity, oligotrophy, and seasonality. The analysis showed that the low-pH lakes are associated with dystrophy and hence are likely to be naturally acidic. There was no evidence

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SAKELLARIADOU, F. "Spectroscopic studies of humic acids from subsurface sediment samples collected across the Aegean Sea." Mediterranean Marine Science 7, no. 2 (2006): 11. http://dx.doi.org/10.12681/mms.166.

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Natural humic acids are biogenic, structurally complex and heterogeneous, refractory, acidic, yellow-to black-coloured organic polyelectrolytes of relatively high molecular weight. They occur in all soils, sediments, fresh waters, and seawaters. Humic acids represent the largest portion of nonliving soil organic matter. In the present paper, humic substances were isolated from marine subsurface sediment samples collected across the Aegean sea (in Greece) and especially from a marine area extending northwards of the Samothraki plateau towards the north-eastern part of the island of Crete. In a

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N., D. Dinesh, Nagaraja P., and S. Rangappa K. "A facile and sensitive spectrophotometric analysis of sulfonamides in pure form and its pharmaceuticals." Journal of Indian Chemical Society Vol. 80, Oct 2003 (2003): 934–36. https://doi.org/10.5281/zenodo.5839520.

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Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore-570 006, India <em>E-mail : </em>rangappaks@yahoo.com                     <em>Fax : </em>91-95821-2518835, 2421263 <em>Manuscript received 19 August 2002, revised 25 February 2003, accepted 4 March 2003</em> A sensitive and simple spectrophotometric method for the determination of sulfonamides in either pure form or its pharmaceutical formulations is described. The method is based on the formation of red colour

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MUESCHKE, NICHOLAS J., OLEG SCHILLING, DAVID L. YOUNGS, and MALCOLM J. ANDREWS. "Measurements of molecular mixing in a high-Schmidt-number Rayleigh–Taylor mixing layer." Journal of Fluid Mechanics 632 (July 27, 2009): 17–48. http://dx.doi.org/10.1017/s0022112009006132.

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Molecular mixing measurements are reported for a high-Schmidt-number (Sc~ 103), small-Atwood-number (A≈ 7.5 × 10−4) buoyancy-driven turbulent Rayleigh–Taylor (RT) mixing layer in a water channel facility. Salt was added to the top water stream to create the desired density difference. The degree of molecular mixing was measured as a function of time by monitoring a diffusion-limited chemical reaction between the two fluid streams. The pH of each stream was modified by the addition of acid or alkali such that a local neutralization reaction occurred as the two fluids molecularly mixed. The prog

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Kuliev, K. A. İbrahimov H.İ. Ismailova Sh. Y. Aliyev S.G. Mamedova Sh.A. "SPECTROPHOTOMETRIC DETERMINATION OF VANADIUM (IV, V) USING DITHIOLPHENOLS AND AMINOPHENOLS." INDO AMERICAN JOURNAL OF PHARMACEUTICAL SCIENCES 06, no. 02 (2019): 3267–78. https://doi.org/10.5281/zenodo.2560540.

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<em>Dithiolphenole (DP) has been synthesized and characterized with IR and NMR spectroscopic methods. A simple and spectrophotometric methods has been developed for the determination of trace amounts of vanadium (IV, V). The reagents forms an blue coloured insoluble in water complex with vanadium (IV, V) in acidic medium (pH 2.5-8.5). In the presence of hydrophobic amines form ternary complexes. As hydrophobic amine 2,6-bis (N, N-dimethylaminomethyl)-4-methylphenol(AP<sub>1</sub>),2 (N, N-diethylaminomethyl)-4-bromophenol(AP<sub>2</sub>), 2,6-bis (N, N-dimeth

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Vichare, Manasee, and Prashant Masali. "A Study on Bioadsorption of Synthetic Dye Using Guava (Psidium guajava) Leaves." Volume 5 - 2020, Issue 9 - September 5, no. 9 (2020): 215–18. http://dx.doi.org/10.38124/ijisrt20sep167.

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Guava (Psidium guajava, white Indian) is common fruit bearing plant found throughout the Indian peninsula. It is said to be native to Mexico and Southern America and now can be found in many of the Asian countries. It is grown in tropical and sub-tropical region around the world. Guava leaves have shown many properties like antibacterial, bioadsorbent, etc. The bioadsorbent property can be exploited to remove coloured residues from water bodies. Problems like water pollution have arisen due to rapid industrialization and urbanization. Various harmful dyes like Coomassie brilliant blue, used in

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Elizabeth Paul, Dr Sara, Dr Divya Reddy, Dr Santhosh T Paul, and Dr Shuhaib A Rahman. "Comparative Evaluation of Erosive Potential of Different Pediatric Liquid Medications on Primary Tooth Enamel and Tooth Coloured Restorative Materials." RGUHS Journal of Dental Sciences 13 (2021): 30–36. http://dx.doi.org/10.26715/rjds.13_2_8.

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Aim: The aim of the present study was to investigate the erosive potential of pediatric liquid analgesics and their effect on primary enamel, glass ionomer and composite resin restorations. Methods: Selected medications were analysed in triplicates with regard to pH and titratable acidity. Eighteen specimens each of glass ionomer, composite resin and primary enamel were prepared and stored in 100% relative humidity at 37ºC for 7 days. After baseline surface roughness analysis using 3D optical profilometer, specimens were randomly distributed according to immersion media into three groups (n=6)

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Acharyulu, M. L. N., P. V. S. R. Mohana Rao, and I. Siva Ramakoti. "Condensation Methods for the Determination of Darunavir in Pure and Pharmaceutical Formulations." International Journal of ChemTech Research 13, no. 4 (2020): 394–401. http://dx.doi.org/10.20902/ijctr.2019.130408.

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Two visible spectrophotometric methods were developed Aand B for the determination of Darunavir in pure and pharmaceutical formulations. The methods are based on condensation reaction with PDAB (Method-A) and ONB (Method-B) in presence of acidic medium with the primaryamine group in DNV. The coloured products exhibit absorption λmax at 639 nm and 452nm for methods A and B respectively. Regression analysis of Beer-Lambert plots showed good correlation in the concentration ranges 10-60μg/ml, 50-300 μg/ml, correlation co-efficients are 0.9983, 0.9989;Sandell’s sensitivities are9.9833 x 10-3, 3.04

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P., Jagadeesh U. Srikanth M. M. Eswarudu* P. Srinivasa Babu Sk. Aneesh P.S.H. R. Khan S. Sai Pooja K. Naga Rani. "NEW VALIDATED EXTRACTIVE SPECTROPHOTOMETRIC METHOD FOR THE DETERMINATION OF RUFINAMIDE IN BULK AND ITS PHARMACEUTICAL DOSAGE FORM." INDO AMERICAN JOURNAL OF PHARMACEUTICAL SCIENCES o6, no. 06 (2019): 11798–805. https://doi.org/10.5281/zenodo.3244150.

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<em>A simple, precise, selective and affordable spectrphotometric method has been developed for the determination of Rufinamide in its bulk and pharmaceutical dosage form. The method was based on ion-pair complex formation between the drug and anionic dye i.e. Bromothymol blue in acidic medium (pH 2.0-4.0). The coloured complex formed was quantitatively extracted into chloroform and measured wavelength at 416.5 nm. Beer’s law was obeyed in the concentration range of 10-60µg/ml with correlation coefficient (n=6) ≥ 0.997. The stoichiometry of the complexes formed between drug and

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B., Narayana, Mathew Mendalin, V. Sreekumar N., and Vipin K. "A facile spectrophotometric method for the determination of copper( II) using variamine blue as a chromogenic reagent." Journal of Indian Chemical Society Vol. 80, Oct 2003 (2003): 937–38. https://doi.org/10.5281/zenodo.5839526.

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Department of Studies in Chemistry, Mangalore University, Mangalagangothri-574 199, India <em>E-mail : </em>nbadiadka@yahoo.co.uk                        <em>Fax : </em>91-824-2287367 <em>Manuscript received 23 September 2002, revised 20 February 2003, accepted 2 April 2003</em> A rapid and sensitive spectrophotometric method is described for the determination of trace amounts of copper using variamine blue (VB) as a chromogenic reagent. The method is based on the reaction of coppe

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Sativa, Siti Oryza, Muhammad Ali Zulfikar, Ervin Tri Suryandari, and Muhammad Nasir. "Effect of Composite Composition in Nanofiber for Degradation of Humic Acid Solution." Advanced Materials Research 1162 (April 2021): 87–92. http://dx.doi.org/10.4028/www.scientific.net/amr.1162.87.

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One of the basic needs for human is clean water. Many lowlands and marshy areas in larger islands in Indonesia such as Sumatra and Kalimantan are the source of peat water. This type of water is harmful for people living in such areas and it cannot be used directly for drinking and living. According to the standard quality of good water, peat water does not meet the requirements as a source of water for daily life. Peat water is acidic, red-brownish coloured, and it contains higher organic matters especially humic acid and its derivatives. Photocatalysis process is one of the promising way to t

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