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Journal articles on the topic 'Color reagents'

Author: Grafiati

Published: 7 June 2025

Last updated: 2 August 2025

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1

Amalendu, Sinhababu, and Kundu Somenath. "Modified ninhydrin spray reagent for the identification of amino acids on TLC plates." Journal of Indian Chemical Society Vol. 91, Apr 2014 (2014): 651–55. https://doi.org/10.5281/zenodo.5717948.

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Natural Product Laboratory, Department of Chemistry, The University of Burdwan, Burdwan-713 104, West Bengal, India <em>E-mail</em> : sinhababu04@yahoo.co.in, sinhababu04@gmail.com <em>Manuscript received online 07 August 2013, accepted 09 September 2013</em> Detection of amino acids has utmost importance for the evaluation of protein structure and also for the determination of the C-terminal units of degraded proteins. TLC is an important tool for the identification of amino acids by various specific and non-specific spray reagents. Among the reagents used, ninhydrin is the most popular becau

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Amalendu, Sinhababu, and Basu Sarmistha. "Identification of amino acids on thin layer chromatograms by modified ninhydrin reagent." Journal of Indian Chemical Society Vol. 91, Mar 2014 (2014): 563–67. https://doi.org/10.5281/zenodo.5717758.

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Natural Product Laboratory, Department of Chemistry, The University of Burdwan, Burdwan-713 104, West Bengal, India <em>E-mail</em> : sinhababu04@yahoo.co.in <em>Fax</em> : 91-342-2530452/2634200 <em>Manuscript received online 17 April 2013, revised 19 July 2013, accepted 19 July 2013</em> Spray reagents are very useful for detecting amino acids on thin layer chromatoplates. It is well known that ninhydrin is most widely used as a spray reagent for identification of amino acids due to its high sensitivity, although it produces same purple/violet color with all amino acids, except in two cases

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Sarmistha, Basu, and Sinhababu Amalendu. "Detection of amino acids on TLC plates with modified ninhydrin reagent." Journal Of Indian Chemical Society Vol. 91, Jan 2014 (2014): 159–62. https://doi.org/10.5281/zenodo.5746922.

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Natural Product Laboratory, Department of Chemistry, The University of Burdwan, Burdwan-713 104, West Bengal, India <em>E-mail </em>: sinhababu04@yahoo.co.in Fax : 91-342-2530452/2634200 <em>Manuscript received online 28 January 2013, revised 04 February 2013, accepted 09 February 2013</em> Thin layer chromatography is an important tool for detecting amino acids by several spray reagents. Ninhydrin is the most well known spray reagent for identification of amino acids due to its high sensitivity. But, it produces same purple/violet color with all amino acids, except proline and hydroxy proline

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Ningtyas, Karisma Wulan, Zulfikar Zulfikar, and Bambang Piluharto. "Identification of Ibuprofen, Ketoprofen and Diclofenac by Using Test Strip Based on Imobilized Spesific Reagent on Nata De Coco Membrane." Jurnal ILMU DASAR 16, no. 2 (2016): 49. http://dx.doi.org/10.19184/jid.v16i2.1520.

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Identification of ibuprofen, ketoprofen and diclofenac can be done by using simple method, it is called test strips. Test strip is made by immobilized specific reagents with entrapment technical on membrane matrix, which the used membrane nata de coco. Immobilization reagents with entrapment techniques aimed to trap reagent molecules in the space between the supporting material.The success of this imobilization can be seen from membran changing color after additional reagent and there is no leeching after additional sample on membrane. The used reagent for this identification is methyl red for

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Sentat, Triswanto, Henny Nurhasnawati, and Yunita Rachma Dwinand. "DEVELOPMENT OF PAPER-BASED COLOR TEST-STRIP FOR PARACETAMOL DETECTION IN JAMU." Jurnal Ilmu Kesehatan 7, no. 2 (2020): 137–42. http://dx.doi.org/10.30650/jik.v7i2.1231.

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Chemical medicine which are synthetic chemicals or isolation products must not be added to herbal medicine, that was standared by Indonesian Head of the Drug and Food Control Agency in statement regarding Criteria and Procedure for Registration of Traditional Medicines, Standardized Herbal Medicines, and Phytofarmaka. This study aims to develope prototype of paper-based color test-strip to identify paracetamol trace in several types of Indonesian herbal medicine, better known as Jamu. Research conducted with experimental research wich make paper test-strip prototype by immobilizing reagents in

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Walash, Mohamed I., Abed Abou Ouf, and Fatma B. Salem. "Colorimetric Determination of Sympathomimetic Amines Methyldopa and Noradrenaline." Journal of AOAC INTERNATIONAL 68, no. 1 (1985): 91–95. http://dx.doi.org/10.1093/jaoac/68.1.91.

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Abstract The chromogenic reagent p-dimethylaminocinnamaldehyde (PDAC) is introduced for the determination of the sympathomimetic amines methyldopa and noradrenaline. The method is based on measurement of the orange color developed when the alkaline solution of methyldopa and noradrenaline is allowed to react with PDAC at pH 5.0. The color developed obeys Beer's law in the concentration range 0.1-1.5 mL of 2 x 103M solution of noradrenaline and methyldopa. The results are compared with those obtained with another chromogenic reagent, pdimethylaminobenzaldehyde (PDAB). Determinations on dosage f

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RAKHMATILLAEVA, INDIRA ANVAROVNA1, and SHOKHISTA POLVANNAZIROVNA1 OLTIEVA. "REAGENTS IN THE ANALYSIS OF ALKALOIDS: A COMPREHENSIVE REVIEW." Multidisciplinary Journal of Science and Technology 5, no. 5 (2025): 91–99. https://doi.org/10.5281/zenodo.15346020.

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Alkaloids represent a diverse class of naturally occurring nitrogen-containing compounds with significant pharmaceutical and toxicological properties. This review examines the various reagents employed in the qualitative and quantitative analysis of alkaloids, focusing on their chemical principles, applications, and limitations. The classical precipitation reagents, color-forming reagents, and modern analytical techniques are discussed in detail. Special attention is given to the selectivity, sensitivity, and specificity of these reagents for different alkaloid classes. This comprehensive over

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Abdullayeva, Rayhon Aminovna Ataullayev Zokir Makhsudovich. "DETERMINATION OF THE AMOUNT OF IRON IONS USING ORGANIC REAGENTS." THEORETICAL ASPECTS IN THE FORMATION OF PEDAGOGICAL SCIENCES 2, no. 2 (2023): 188–89. https://doi.org/10.5281/zenodo.7565394.

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Currently, in colorimetric analysis, the concentration of Mn ion is determined using its characteristic color. However, few metal ions produce such strong colors, especially at low concentrations. Many colored complexes can be formed from metal ions and organic or inorganic complexing agents. These complexes are the result of interaction between Lewis acid (metal ion) and Lewis base (complex former) [1]. An ideal color-forming reagent requires that it be stable and selective (even specific) and that it reacts rapidly to form soluble, highly colored complexes.

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Grishkovets, V., and L. Yakovishin. "DETECTION REAGENTS FOR TRITERPENE GLYCOSIDES OF ARALIACEAE PLANTS." Scientific Notes of V.I. Vernadsky Crimean Federal University. Biology. Chemistry 11, no. 2 (2025): 344–51. https://doi.org/10.29039/2413-1725-2025-11-2-344-351.

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A comparative evaluation of the effectiveness of various detecting reagents was carried out in terms of detection limit and differences in the coloration of chromatographic zones for different triterpenoid series. It was shown that the most effective detecting reagents are those based on phosphotungstic acid with the addition of aromatic aldehydes (para-hydroxybenzaldehyde and vanillin) and sulfuric acid. It was demonstrated that the spots of glycosides from the β-amyrin series – namely oleanolic acid, echinocystic acid, and erythrodiol – are stained pink, whereas the spots of glycosides of he

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Kozhinova, E. S., A. V. Tumskaia, and I. V. Kosyreva. "The use of aromatic aldehydes for the test determination of cefotaxime." Industrial laboratory. Diagnostics of materials 89, no. 8 (2023): 5–11. http://dx.doi.org/10.26896/1028-6861-2023-89-8-5-11.

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Indicator papers based on immobilized reagents with their subsequent digital image processing are widely used for the quick and cheap screening study of drugs when assessing the content of the main substance in drugs for the presence of counterfeits. Indicator papers based on reagents immobilized on a cellulose matrix 4-dimethylaminocinnamic aldehyde (DMACA), 4-dimethylaminobenzaldehyde (DMAB), and 3-methoxy-4-hydroxybenzaldehyde (vanillin) were proposed for the determination of β-lactam antibiotic cefotaxime. To specify optimal conditions for the immobilization of reagents on a solid matrix,

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B.Yeşim, Büyükakıncı. "Investigation of dyeing methods on wool fabrics with hibiscus and its antibacterial efficiency." Industria Textila 68, no. 02 (2017): 103–7. http://dx.doi.org/10.35530/it.068.02.1288.

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The present paper deals with the application of natural dyes extracted from powdered Hibiscus flowers and leaves on 100 % woolen fabric. For this puposes, two mordants (copper sulphate, CuSO4.5H2O and tin (II) chloride, SnCl2) and the application methods (pre-, meta-, post- mordanting) were used and their effects on dyeability, color characteristics, fastness properties and antibacterial activities of dyed-mordanting woolen fabric were investigated and evaluated. The color fastness with respect to washing and rubbing was quite satisfactory for both mordant reagents. Unless cupper sulphate was

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Belopukhov, Sergey L., Alexey V. Jevnerov, Andrey V. Bochkarev, and Ravil F. Baibekov. "Test method for determining phosphate ions in organic products and soil using blister cells." Butlerov Communications 61, no. 3 (2020): 92–98. http://dx.doi.org/10.37952/roi-jbc-01/20-61-3-92.

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A test method for the determination of phosphates in environmental objects has been developed, the determination of phosphate ions can be carried out in the field, the analysis of one sample is carried out for 10-15 minutes. Color characteristics can be monitored both visually and using color processing programs for smartphones such as ON Color Measure or Light Analyzer. Variants of compositions of a series of placers are proposed for visually blister colorimetric determination of phosphate ion concentrations in a blister cell (tablet for tablets) containing a mixture of reagents. The placers

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Tomokuni, K., and Y. Hirai. "Factors affecting determination of delta-aminolevulinate by use of Ehrlich's reagent." Clinical Chemistry 32, no. 1 (1986): 192–93. http://dx.doi.org/10.1093/clinchem/32.1.192.

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Abstract We investigated the formation of delta-aminolevulinic acid (ALA)-pyrrole and subsequent color development used in determining ALA in urine. Of three condensation reagents examined--acetylacetone, ethyl acetoacetate, and methyl acetoacetate--the last was the best. When the ALA-pyrrole is reacted with Ehrlich's reagent in ethyl acetate according to one procedure, the optimum concentration of perchloric acid in the reagent is 0.5 to 1.0 mol/L. Its optimum concentration is 1.0 to 2.3 mol/L when the reaction takes place in water.

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Wang, Liang, Weitao Li, Luqiao Yin, et al. "Full-color fluorescent carbon quantum dots." Science Advances 6, no. 40 (2020): eabb6772. http://dx.doi.org/10.1126/sciadv.abb6772.

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Quantum dots have innate advantages as the key component of optoelectronic devices. For white light–emitting diodes (WLEDs), the modulation of the spectrum and color of the device often involves various quantum dots of different emission wavelengths. Here, we fabricate a series of carbon quantum dots (CQDs) through a scalable acid reagent engineering strategy. The growing electron-withdrawing groups on the surface of CQDs that originated from acid reagents boost their photoluminescence wavelength red shift and raise their particle sizes, elucidating the quantum size effect. These CQDs emit bri

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Aziz, M. Rifqi, Chatarina Lilis Suryani, and Ichlasia Ainul Fitri. "Physicochemical Characterization of Simplicia Sambiloto (Andrographis paniculata) Powder with Types and Concentrations of Reagents in the Formation of Zn-Chlorophyll Complexes." JITIPARI (Jurnal Ilmiah Teknologi dan Industri Pangan UNISRI) 9, no. 1 (2024): 54–66. http://dx.doi.org/10.33061/jitipari.v9i1.8982.

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During the process of making sambiloto simplicial which involves heat, it can cause degradation of chlorophyll. Increasing the stability of chlorophyll can be done by forming Zn-chlorophyll complexes with metals which are be able to form complexes where more stable than Mg such as by using Zn. The aim of this research is to determine how the physical and chemical characteristics of the bitter simplicia powder produced are influenced by the type of reagent and the concentration of the reagent when heated in an oven. Simplicia bitter powder is made through a sorting, grinding and sieving process

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Han, Seungyoon, Yeon Hun Jeong, Ju Hae Jung, et al. "Spectrophotometric Analysis of Phosphoric Acid Leakage in High-Temperature Phosphoric Acid-Doped Polybenzimidazole Membrane Fuel Cell Application." Journal of Sensors 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/5290510.

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High-temperature proton exchange membrane fuel cells (HT-PEMFCs) utilize a phosphoric acid- (PA-) doped polybenzimidazole (PBI) membrane as a polymer electrolyte. The PA concentration in the membrane can affect fuel cell performance, as a significant amount of PA can leak from the membrane electrode assembly (MEA) by dissolution in discharged water, which is a byproduct of cell operation. Spectrophotometric analysis of PA leakage in PA-doped polybenzimidazole membrane fuel cells is described here. This spectrophotometric analysis is based on measurement of absorption of an ion pair formed by p

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17

Wang, Lun, Haoxin Shi, Chunlin Sun, and Zhongyi Wang. "Synthesis of Rhodanine Color Reagents and the Color Reaction with Cu(Ⅱ)." Chinese Journal of Applied Chemistry 11, no. 5 (1994): 91–94. http://dx.doi.org/10.3724/j.issn.1000-0518.1994.5.91.

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18

Wang, Lun, Haoxin Shi, Chunlin Sun, and Zhongyi Wang. "Synthesis of Rhodanine Color Reagents and the Color Reaction with Cu(Ⅱ)." Chinese Journal of Applied Chemistry 11, no. 5 (1994): 91–94. http://dx.doi.org/10.3724/j.issn.1000-0518.1994.5.9194.

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19

Almog, Joseph, Genyia Levinton-Shamuilov, Yaron Cohen, and Myriam Azoury. "Fingerprint Reagents with Dual Action: Color and Fluorescence." Journal of Forensic Sciences 52, no. 2 (2007): 330–34. http://dx.doi.org/10.1111/j.1556-4029.2007.00383.x.

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20

Hidayat, Mochammad Amrun, Yunita, Rahma Riska Panida, Indah Yulia Ningsih, and Bambang Kuswandi. "Development of The Scanometric Method for Caffeine Determination in Pharmaceutical Preparations." Jurnal Riset Kimia 16, no. 1 (2025): 113–20. https://doi.org/10.25077/jrk.v16i1.756.

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The caffeine assay can be developed by using sensitive reagents for caffeine detection, such as sodium periodate (NaIO4), acetic acid (CH3COOH), and 3-methyl-2-benzothiazolinone hydrazone (MBTH) inside 96-microwell plate. The addition of caffeine solution could change the color of the reagent from white to deep blue which can be then scanned and quantified by a flatbed scanner and the color image analysis program, known as the scanometric method. Analytical characterization such as linearity, LOD, LOQ, precision, accuracy, and stability of the developed method was established by using caffeine

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Lestari, Dwi, Mutia Dewi, Suci Cahya Ningsih, and Hidayati Hidayati. "IDENTIFIKASI BORAKS PADA PENTOL BAKSO YANG DI KELURAHAN AIR HITAM DENGAN PEREAKSI KULIT BUAH NAGA MERAH (Hylocereus polyhizus)." Jurnal Riset Kefarmasian Indonesia 3, no. 1 (2021): 58–64. http://dx.doi.org/10.33759/jrki.v3i1.125.

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Borax is often misused to preserve various foods such as wet noodles, meatballs, rice cake, rhombus and so on. Red dragon fruit skin contains secondary metabolites, namely anthocyanin, anthocyanin is the most important and widespread dye in the skin of red dragon fruit, but the use of red dragon fruit peels has not been studied much naturally. The purpose of this study was to identify borax on the meatball sold in the Air Hitam district with the red dragon fruit skin reagent (Hylocereus polyhizus). This research is experimental with data collection techniques by accidental sampling. In this st

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Yalaletdinova, Alina, Maria Malkova, Margarita Vozhdaeva, Pavel Serebryakov, Olga Kantor, and Evgeny Kantor. "Prediction of optimal coagulant and flocculant dosage for water treatment at surface water intake." E3S Web of Conferences 480 (2024): 02009. http://dx.doi.org/10.1051/e3sconf/202448002009.

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Reagent treatment is one of the main methods of source water treatment in water supply plants. Suitable values of coagulant and flocculant doses, as a rule, are selected experimentally, and do not vary depending on seasonal changes in indicators. Therefore, to achieve high efficiency of water treatment, there is a need to determine the doses of coagulant and flocculant for the whole year and for separate seasonal periods in order to compare them. Regression analysis allowed us to quantitatively describe the relationships between turbidity, color, oxidizability and hardness of the source water

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Gorodecky, Vladimir, Semen Semenikhin, Nailya Daisheva, Natalya Kotlyarevskaya, and Alla Fabritskaya. "Identification of influential patterns of chemical treatment of sugar production thick juice and remelt syrups on the beet sugar quality." BIO Web of Conferences 46 (2022): 01004. http://dx.doi.org/10.1051/bioconf/20224601004.

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Laboratory studies have been carried out on the effect of chemical treatment with the use of various sulfite-containing reagents of sugar production concentrated intermediates - thick juice and remelt syrups on the beet sugar quality. It has been established that the chemical treatment of concentrated intermediates with the use of sulfur dioxide provides a greater reduction in their color compared to sodium bisulfite – from 996,7 to 830,30 and 857,30 ICUMSA units, respectively. It has been established that chemical treatment with the use of sulfite-containing reagents improves the quality of t

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Tatyana, Artyukh, Kupalova Galyna, Bazylevych Viktor, Hryhorenko Inna, and Ternova Alla. "IMPROVING A PROCEDURE FOR DETERMINING THE ASSAY OF GOLD IN A PRECIOUS ALLOY OF DIFFERENT COMPOSITION USING A TOUCHSTONE." Eastern-European Journal of Enterprise Technologies 2, no. 12 (98) (2019): 6–19. https://doi.org/10.15587/1729-4061.2019.165408.

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We report testing the yellow and white jewelry alloys based on gold that contains nickel, zinc, palladium, using a touchstone by applying various chemical reagents and XFA (X-ray fluorescence analysis). We have improved the procedure for assessing the conformity of assay of the precious alloys based on gold, considering the content of component composition by using the results from rubbing the alloys on a touchstone. It was established that the magnitude of gold assay for precious alloys in the system AuAgZnCu, determined under the action of the reagent "chloric gold" on the touchsto

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Stall, Alan, Feng-Jun Luan, Mark Edinger, Maria Jaimes, Jeanne Elia, and Yu Chen. "Improved identification of leukocyte sub-populations using new bright fluorochrome reagents in multi-color flow cytometric analysis. (124.11)." Journal of Immunology 188, no. 1_Supplement (2012): 124.11. http://dx.doi.org/10.4049/jimmunol.188.supp.124.11.

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Abstract With many cell surface markers expressed at very low levels the ability to identify (and sort) biologically relevant sub-populations by flow cytometry is often limited by the availability of fluorescent reagents sufficiently bright to resolve these markers. In the past year multiple new fluorochromes have been developed which have significantly improved brightness compared to previously available reagents. In particular, BD Horizon™ PE-CF594 and BD Brilliant Violet™ 421 reagents can be 2-5 times brighter than equivalent PE reagents which have typically been the brightest available. Th

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Polski, J. M. "Simplification of Clinical Flow Cytometry by Adoption of Premixed Antibody Panels." American Journal of Clinical Pathology 154, Supplement_1 (2020): S112—S113. http://dx.doi.org/10.1093/ajcp/aqaa161.246.

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Abstract Introduction/Objective Multiparameter flow cytometry (MFC) is the standard of care for the diagnosis and monitoring of hematopoietic and lymphoid neoplasms. While MFC is a mature technology, new innovations are brought to the market. Such an innovation is the ClearLLab10C, FDA-cleared, 4-tube, 10-color, dry, premixed antibody panels (Beckman Coulter Diagnostics, Brea, California). Our laboratory decided to implement this new reagent system combined with 10-color clinical flow cytometer, Navios EX from the same vendor. This paper describes the clinical validation results for leukemia/l

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Genshaw, M. A. "Color aspects of reagents used visually in clinical analysis." Color Research & Application 10, no. 4 (1985): 235–44. http://dx.doi.org/10.1002/col.5080100413.

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Namba, Kosuke, Ayumi Osawa, Akira Nakayama, et al. "Synthesis of yellow and red fluorescent 1,3a,6a-triazapentalenes and the theoretical investigation of their optical properties." Chemical Science 6, no. 2 (2015): 1083–93. http://dx.doi.org/10.1039/c4sc02780a.

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., Zuriani, Irwana Wahab, and Safwan . "Bougainvillea Flower Extract Utilization as Eosin Substitute in Worm Eggs Microscopic Observation." International Journal of Science and Healthcare Research 8, no. 3 (2023): 399–404. http://dx.doi.org/10.52403/ijshr.20230354.

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Introduction: Flavonoids, glycosides, alkaloids, phlobatannins, saponins, steroids, tannins, and terpenoids are all known components of bougainvillea flowers. The betalain compounds betasianin and betaxanthin, which give bougainvillea flowers their color, are present. Betalains are water-soluble pigments classified into betacyanins (red) and betaxanthins (yellow). The eosin dye, which can stain worm eggs, is comparable to the pigment in bougainvillea flowers. Because reagents are expensive, raw materials from the local area must be used instead. Local raw materials can replace eosin reagents.

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Jaluddin, Siti Nurhazlin, Zainiharyati Mohd Zain, Mohamed Izzharif Abdul Halim, Muhd Fauzi Safian, Mohd Azri Abdul Rani, and Mohamed Sazif Mohamed Subri. "Preliminary Evaluation of Gunshot Residue (GSR) Using 3-Aminophenol as a Substitute in Modified Griess Test." Indonesian Journal of Chemistry 21, no. 6 (2021): 1550. http://dx.doi.org/10.22146/ijc.68265.

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In forensic ballistics, gunshot residue (GSR) particles can be detected using screening or presumptive tests which are mainly focused on the chromophoric reaction. Most tests serve as an initial indication for a forensic investigator at the crime scene before instrumental analysis for definitive identification. The screening methods are known to be convenient, have fast analysis, and minimal preparation. In GSR analysis, the well-known method of detecting GSR known as the Modified Griess Test (MGT) requires acid and heat for the reaction. Therefore, this study demonstrated a new and rapid scre

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Rahmawati, Suci, Marliza Marliza, Rose Intan Perma Sari, Nori Wirahmi, Oktoviani Oktoviani, and Sipriyadi Sipriyadi. "SKRINING FITOKIMIA INFUSA DAUN SUNGKAI (Peronema canescens Jack.) DENGAN METODE REAKSI WARNA." Journal Pharmacopoeia 2, no. 2 (2023): 120–27. http://dx.doi.org/10.33088/jp.v2i2.482.

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Sungkai (Peronema canescens Jack) was used traditionally as a medicine to help relieve fever, malaria and flu. In general, people was used sungkai leaves in the form as infusion. This study was aimed to screening of secondary metabolite of Sungkai leaf infusion using the color reaction method. The sample in this study was sungkai leaf that obtained from Bengkulu city. The infusion was obtained by boiling 10 gram of sungkai leaf simplicia with 100 ml of distilled water for 15 minutes at 90 0C until a concentration of 10% (w/v) was obtained. Secondary metabolite screening was carried out using t

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Bashratyan, Roman, Feng-Jun Luan, Stephanie Widmann, et al. "Tools to simplify panel design for multi-color flow cytometry experiments." Journal of Immunology 198, no. 1_Supplement (2017): 81.22. http://dx.doi.org/10.4049/jimmunol.198.supp.81.22.

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Abstract While flow cytometry continues to be a critical tool for immunologists, one of the more difficult aspects of this practice is panel design. Fully resolving dim populations of interest can be challenging. Low antigen density, fluorescence spillover, available fluorochromes and limited catalog offerings are just a few of the factors that make panel design difficult often leading to sub-optimal resolution. Previously, we have shown that following a basic set of principles can reduce the number of iterations needed to maximize the resolution for populations of interest. Here we show how r

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Kardos, Ibolya, and Zoltán Gácsi. "Investigation of Microstructure of Cast Iron by Color Etching." Materials Science Forum 752 (March 2013): 167–74. http://dx.doi.org/10.4028/www.scientific.net/msf.752.167.

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A lot of phases can be present in the structure of cast iron depending on the quality and the heat treatment processes. By using the color etching, the different phases – e.g. the carbides – can exactly be identified and their quantity can be measured. The carbide of iron (cementite) or other types of carbides existing in the structure have a significant influence on the properties of cast product therefore strict prescriptions regulate their quantity mainly in case of making cast products for the motor-car industry. In the course of our experiments performed by using the color etching, we pro

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Rahmi Nurhaini, Muchson Arrosyid, and Titik Susanti. "Identifikasi Golongan Senyawa Flavonoid Ekstrak Etanol Daun Anting-Anting (Acalypha indica L.)." CERATA Jurnal Ilmu Farmasi 12, no. 1 (2021): 42–46. http://dx.doi.org/10.61902/cerata.v12i1.225.

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    Anting-anting leaf is one type of plant that has medicinal properties and has not been widely used by the community. Previous research stated that the ethanol extract of Anting-anting has secondary metabolite compounds such as saponins, flavonoids, alkaloids, tannins. Flavonoids are a source of antioxidants that can inhibit premature aging caused by free radicals produced by pollution. Flavonoids can be used to avoid deadly diseases including heart disease and cancer. The purpose of this study was to determine the class of flavonoid compounds present in anting-antin

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Bogacheva, Natalya V., Ksenia A. Tarbeeva, and Natalya Yu Ogorodova. "DEVELOPMENT OF STEP-BY-STEP METHOD FOR PRODUCING SILVER NANOPARTICLES BY CITRATE METHOD." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 63, no. 5 (2020): 65–69. http://dx.doi.org/10.6060/ivkkt.20206305.6171.

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The article presents an algorithm for developing a step-by-step method for producing silver nanoparticles 30-35 nm in size, taking into account the establishment at each stage of the necessary ratio of concentrations and volumes of reagents. In the work, silver nitrate and sodium citrate anhydrous were used by «Sigma-Aldrich» (USA). All test solutions were prepared by the gravimetric method. To weigh the reagents, we used Adventurer electronic analytical balances («OHAUS», USA) (with a resolution of 0.0001 g). The size and density of silver nanoparticles were estimated using a JEM-1011 electro

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Gorodetsky, V. O., S. O. Semenikhin, N. M. Daisheva, and N. I. Kotlyarevskaya. "Identification of influential patterns of sulfitation treatment of sugar production thick juice and remelt on the beet sugar quality." New Technologies 18, no. 2 (2022): 35–43. http://dx.doi.org/10.47370/2072-0920-2022-18-2-35-43.

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It is well known that in order to obtain crystalline sugar of a high quality category (Extra and TS1), it is necessary to ensure the production of concentrated sugar-containing intermediates with the lowest possible color, since it is these intermediates that directly determine the color of the resulting crystalline sugar. Laboratory studies have been carried out on the effect of sulfitation treatment using various reagents, namely, sulfurous anhydride and sodium bisulfite, of concentrated intermediates – thick juice and remelt syrup B+C of sugar production on the quality of beet sugar. It has

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Anggraini, Citra Dewi, S. Susiana, Putri Yurida Sari, Randi Dwi Anggriawan, and Muhamad Firdaus. "PERFORMA (PAPER TEST KIT FORMALIN) AS THE ALTERNATIVE SELECTION TO IMPROVE THE QUALITY OF FOOD INGREDIENTS." KnE Life Sciences 2, no. 1 (2015): 168. http://dx.doi.org/10.18502/kls.v1i0.101.

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Research on "PERFORMA" or Paper Test Kits Formalin is as an alternative to improve the quality of food selection. It is aiming to get a paper test kit that can detect formaldehyde contented in foodstuffs practically, fast, easy, and inexpensive. The method used in this study is an experimental method which is part of a quantitative method that aims to manipulate and control variables. The data collection is based on the research and the observation of the color change on the paper test kit is generated from Schiff reagent test, in which the paper test kit will give a purple color response when

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Quawsar, Ali M., Farjana Afrin, Mst IA Begum, Md G. Haider, Shah MA Rauf, and Hossain M. Golbar. "Differentiation Of Meat From Dead And Slaughtered Animals Based On Hemoglobin Content." Journal of Bio-Science 32, no. 1 (2024): 31–39. http://dx.doi.org/10.3329/jbs.v32i1.74986.

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Meat from dead animal is not good for human consumption. Slaughtering of animal results in 75-85% bleeding efficiency whereas dead animals do not bleed at all. Considering these views, this work aimed to develop a protocol for the differentiation of meat from dead and slaughtered animals based on hemoglobin content. Meat samples collected from dead and slaughtered layer, broiler and Sonali chickens and cattle were analyzed with two reagents viz. leucomalachite green (LMG) and tetramethyl benzidine (TMB). In brief, the muscle tissue was chopped, in triplicate, and placed in distilled water to l

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Vurobi, Selauco, Thiago Ferreira de Andrade, and Osvaldo Mitsuyuki Cintho. "Utilization of Color Metallography in Characterization of a Modified SAE 4118H Steel Submitted to Isothermal Treatments." Materials Science Forum 805 (September 2014): 242–47. http://dx.doi.org/10.4028/www.scientific.net/msf.805.242.

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A modified SAE 4118H steel was subjected to isothermal treatments between 700 °C and 400 oC every 50 °C range, with the intention of evaluating the decomposition of austenite at constant temperature. It was varied time of stay in the isothermal treatment between 15 and 28800 seconds depending on the treatment temperature. After each isothermal treatment and standard metallographic preparation, the samples were etched with color metallography reagents for revealing the microstructure obtained. At temperatures of 700oC to 550°C the steel showed microstructure composed of ferrite and pearlite. Be

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Kusumawati, Endang, Bunga Liswandila, Erisca Saputri, and Tifa Paramitha. "Characterization and Treatment Pharmaceutical Wastewater by Photo-Fenton Process." Research in Chemical Engineering (RiCE) 4, no. 1 (2025): 38–43. https://doi.org/10.30595/rice.v4i1.269.

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The characteristics of the PT X pharmaceutical wastewater influent were a pH of 7.18, a COD of 384 mg/L, and a red-brown color. The Chemical Oxygen Demand (COD) has not met the quality standards based on the Ministry of Environment and Forestry Regulation No. 5 of 2014. The red-brown color was caused by wastewater containing rifampicin as a component of the tuberculosis drug. The objectives of this study were treating the real pharmaceutical wastewater to reduce COD and color by varying the molar ratio of the Fenton reagents and to identify the influence of the neutralization process. The Fent

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Sri K., Bhavya, Hema B., Sumakanth M., and Anil Damarancha. "TWO SENSITIVE CHROMAGENIC METHOD DEVELOPMENT AND VALIDATION OF MOLNUPIRAVIR IN BULK AND PHARMACEUTICAL DOSAGE FORM." INDIAN DRUGS 62, no. 02 (2025): 68–77. https://doi.org/10.53879/id.62.02.14451.

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Molnupiravir is an antiviral medication which is utilized to treat COVID-19. Mechanism of action involves increasing the occurrence of mutations in viral RNA, which subsequently hampers the replication of SARS-CoV-2 in humans. This study focuses on the visible method development & validation for analyzing molnupiravir in bulk & dosage form using visible spectroscopy. To assess the chromogenic properties of molnupiravir, different reagents were employed. Notably, a color change was observed with the FC reagent and MBTH reagent. An ELICO SL-210 UV-Visible spectrometer was employed in thi

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Johansson, Ulrika, Na Li, Natalie Golts, and Suraj Saksena. "Standardized Approach for Monitoring Plasma Cell Disorders." Journal of Immunology 204, no. 1_Supplement (2020): 159.16. http://dx.doi.org/10.4049/jimmunol.204.supp.159.16.

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Abstract Multi-color flow cytometry using consensus surface markers (CD138, CD38, CD19, CD45, CD27, CD56, CD81, and CD117), intracellular kappa and lambda, as well as other auxiliary markers is routinely used for the identification and characterization of plasma cells. Here, we describe the development of a modular 10-color plasma cell panel for immunophenotyping of the plasma cell compartment. The panel was developed as an 8-color dried backbone, manufactured in a single test-per-tube, ready to use format. The dried backbone can be supplemented with liquid (drop in) reagents, which provides t

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Vurasko, Alesja Valer'evna, Inna Gennadyevna Pervova, Irina Olegovna Shapovalova, Yakov Vladimirovich Kazakov та Ekaterina Yuryevna Patrakova. "SORPTION PROPERTIES OF SILICА-CONTAINING CELLULOSE FROM RICE HUSK". chemistry of plant raw material, № 4 (4 грудня 2024): 369–79. https://doi.org/10.14258/jcprm.20240413780.

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Cellulose-based sorbents from renewable sources, more specifically, plant cell membranes, are getting increasingly used as solid-phase matrix carriers in hybrid reagent indicator test systems, since the sorbents can provide high sensitivity to the toxicants to be detected/determined due to combining two operations - concentration and registration of the analytical signal, directly in the sorbent phase. The study was aimed to reveal relationships between the properties of preserved natural silicon dioxide during oxidative-organosolv delignification of rice husk and on the sorption properties. I

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Peşman, Emrah, and Mehtap Parlak. "Recycling of colored office paper. Part II: Post-bleaching with formamidine sulfinic acid and hydrogen peroxide." BioResources 13, no. 3 (2018): 4841–55. http://dx.doi.org/10.15376/biores.13.3.4841-4855.

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In this study, the optimization of formamidine sulfinic acid (FAS) and hydrogen peroxide (P) bleaching stages of pre-bleached blue, red, yellow, green, and mixed colored office papers was investigated. The FAS was performed as a strong color stripping reagent on blue and green colored samples. However, due to reduced amine compounds FAS was not found to be effective on the red colored samples. In contrast, effective results were obtained with hydrogen peroxide on the red and yellow colored samples. These results showed that the two reagents must be used together in a sequence. Therefore, in th

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Bakhtin, Andrey V., and Marina O. Slyuta. "QUALITY RESEARCH OF PAPER COLOR MANAGEMENT SYSTEMS." Bulletin of the Saint Petersburg State Institute of Technology (Technical University) 63 (2022): 100–103. http://dx.doi.org/10.36807/1998-9849-2022-63-89-100-103.

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Paper color is one of the most important indicators of paper quality. Currently there is no information on functional color management systems. The study contains an analysis of information on the quality of color management on various paper machines for the production of printed papers. The research methodology consisted in the formation of a sample of numerical values of color coordinates in the CIE system from the archives of the APCS servers and laboratories of quality departments at factories. The analysis of the quality of operational control systems was carried out on the basis of the c

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Chang, Shang-Tzen, and Jyh-Horng Wu. "Stabilizing Effect of Chromated Salt Treatment on the Green Color of Ma Bamboo (Dendrocalamus latiflorus)." Holzforschung 54, no. 3 (2000): 327–30. http://dx.doi.org/10.1515/hf.2000.055.

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SummaryProcessed bamboo culms capable of maintaining the greenish color in their skin have increased economic value. The use of protectors to preserve the green color and to improve the color fastness of bamboo culms has, therefore, attracted great interest in the industry. In this paper three exposure tests, including accelerated UV lightfastness, outdoor weathering, and indoor exposure, were used to evaluate the color fastness of ma bamboo (Dendrocalamus latiflorusMunro) treated with chromium based reagents. Experimental results revealed that bamboo culms treated with CCP (chromated copper p

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Dushkin, S., T. Shevchenko, and O. Galkina. "USE OF MODIFIED REAGENTS SOLUTIONS WHEN PREPARING DRINKING WATER." Municipal economy of cities 6, no. 166 (2021): 141–45. http://dx.doi.org/10.33042/2522-1809-2021-6-166-141-145.

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Currently, attention is paid to the intensification of the process of natural and wastewater treatment, improvement of technology, development of new effective methods of intensification of water treatment. This will simplify the existing technology of water treatment, reduce labor-intensive processes of preparation and dosing of reagents, reduce the cost of operating treatment plants, increase their productivity, improve quality and reduce the cost of treated water. Treatment of water with a modified coagulant solution allows to increase the hydraulic size of the coagulated suspension. The st

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Okamoto, Shunya, Yuto Mori, Shota Nakamura, et al. "Proposal of a Rapid Detection System Using Image Analysis for ELISA with an Autonomous Centrifugal Microfluidic System." Micromachines 15, no. 11 (2024): 1387. http://dx.doi.org/10.3390/mi15111387.

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In this study, with the aim of adapting an enzyme-linked immunosorbent assay (ELISA) system for point-of-care testing (POCT), we propose an image analysis method for ELISAs using a centrifugal microfluidic device that automatically executes the assay. The developed image analysis method can be used to quantify the color development reaction on a TMB (3,3′,5,5′-tetramethylbenzidine) substrate. In a conventional ELISA, reaction stopping reagents are required at the end of the TMB reaction. In contrast, the developed image analysis method can analyze color in the color-developing reaction without

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Nurmila, Nurmila, H. Sinay, and Theopilus Watuguly. "IDENTIFIKASI DAN ANALISIS KADAR FLAVONOID EKSTRAK GETAH ANGSANA (Pterocarpus indicus Willd) DI DUSUN WANATH KECAMATAN LEIHITU KABUPATEN MALUKU TENGAH." Biopendix: Jurnal Biologi, Pendidikan dan Terapan 5, no. 2 (2019): 65–71. http://dx.doi.org/10.30598/biopendixvol5issue2page65-71.

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Background: Medicinal plants have many benefits that make it a traditional medicine for society. One of the medicinal plants used by the community, especially the Wanath Hamlet community, is the angsana gum (Pterocarpus indicus Willd.) In treating diseases. Method: This study aims to identify and analyze flavonoid levels in angsana sap (Pterocarpus indicus Willd.) In Wanath Hamlet qualitatively (flavonoid color test) and quantitative (flavonoid content analysis). Results: The results show a change in color to yellow which indicates that the sap is positive for flavonoids, while in

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Guan, Xue Mei, and Ming Hui Guo. "Study on the Relationship between Surface Color of Veneer and Dyeing Technique for Pinus sylvest var. mongolica." Advanced Materials Research 113-116 (June 2010): 1270–74. http://dx.doi.org/10.4028/www.scientific.net/amr.113-116.1270.

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Dyeing experiment was conducted to explore the effects of dyeing concentration, Penetrant concentration, ash concentration, salt concentration, dyeing temperature and dyeing time, Fixing time, liquor ratio on surface coloration of Pinus sylvest var. mongolica as test material and reactive brilliant red X-3B as reagents. Color difference was measured by amulti-lightsource spectrophotometer, and results showed that dye concentration for the effects of color difference was monotonous relationship, and the other the impact of changed in both convex and concave, and finally to determined the optima

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