Log in

Relevant bibliographies by topics / Acid colour / Journal articles

To see the other types of publications on this topic, follow the link: Acid colour.

Journal articles on the topic 'Acid colour'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Acid colour.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Griber, Yu. "Chromatic characteristics of acid colour." Bulletin of Science and Practice, no. 10 (October 14, 2017): 318–27. https://doi.org/10.5281/zenodo.1012423.

Full text

Abstract:

The research object is the term acid, which used to describe the colour in the Russian language as a description, clarifying the colour characteristics and not pointing to a certain tone, but recently has been increasingly used as an autonomous word. The subject of the study is the chromatic image of the colour name acid. The research goal is to continue the tradition of the psycholinguistic description of the system of colour naming in the Russian language, to define the significative and denotative structure of the colour name acid and to conduct a graphical analysis of the obtained data usi

APA, Harvard, Vancouver, ISO, and other styles

2

Kapilraj, N., S. Keerthanan, and M. Sithambaresan. "Natural Plant Extracts as Acid-Base Indicator and Determination of Their pKa Value." Journal of Chemistry 2019 (April 10, 2019): 1–6. http://dx.doi.org/10.1155/2019/2031342.

Full text

Abstract:

Commonly used indicators for acid-base titrations are synthetic, and this work was focused to identify the eco-friendly natural indicators and to determine their pKa values. The analytical potential of the flower extracts is very promising as seen in its application in acid-base titrimetry. These selected flower extracts were found to perform well in titrating strong acid-strong base than in weak acid-strong base. We have obtained a sharp and clear colour change from red to brownish yellow for the Bougainvillea glabra extract, from red to yellow for the Bauhinia purpurea extract, and from red

APA, Harvard, Vancouver, ISO, and other styles

3

A., K. lndrayan. "Natural dyes as neutralization indicators-a short review." Journal of Indian Chemical Society Vol. 80, May 2003 (2003): 505–9. https://doi.org/10.5281/zenodo.5839478.

Full text

Abstract:

Deparatment of Chemistry, Gurukula Kangri University, Hardwar-249 404, India <em>E-mail:</em> akindray@sancharnet.in <em>Manuscript received 12 November 2002</em> Some of the naturally occurring coloured substances are pH-sensitive giving distinctly different colours in acid and basic mediums. Some of them, like the red cabbage aqueous extract, are colour-sensitive even to the same medium pH variation also and make a very good laboratory experiment for pH determination. Anthocyanidins are among the commonly occurring natural pigments. Natural colours giving a sharp, distinct and stable colour

APA, Harvard, Vancouver, ISO, and other styles

4

Ghosh, Rahul Ranjan, Y. C. Radhalakshmi, and S. Periyasamy. "Comparative Study on Dyeing Behaviours of Tasar and Tasar Blended Silk Fabrics." Chemical Science International Journal 33, no. 3 (2024): 109–18. http://dx.doi.org/10.9734/csji/2024/v33i3898.

Full text

Abstract:

Tasar silk is widely sought after because to its natural beauty, durability, sustainability, and cultural relevance. Despite the long-standing yearning for Tasar textiles in their natural colour, weavers can only manufacture a limited number of different designs and types of the silk.It has become necessary to dye the Tasar fabric a different colour since the younger generation requires 100% Tasar cloths in a range of styles and colour combinations.Some manufacturers are now dyeing Tasar fabrics in smaller quantities, but their processing quality is subpar due to non-compliance with correct pr

APA, Harvard, Vancouver, ISO, and other styles

5

Napoli, Giuseppe, Chiara Zitelli, Domenico Corapi, and Andrea di Schino. "Titanium Alloys Anodic Oxidation: Effect of Experimental Parameters on Surface Colouring." Materials Science Forum 941 (December 2018): 730–34. http://dx.doi.org/10.4028/www.scientific.net/msf.941.730.

Full text

Abstract:

The present study is focused on analysing the change of colours of anodized titanium and effects of applied electrolytic voltages on chromatics. The titanium specimens were anodized in 20 g/L citric acid and 20 g/L baking soda electrolyte by use of different voltages. The colours of anodized titanium were measured with a spectrophotometer and then evaluated in the CIELAB colour space. It is found that different volt produces different colours. Anodizing in the range of 15 V to 150 V produces respectively a wide spectrum of colour ranging from brown to fuchsia. It can be concluded that the colo

APA, Harvard, Vancouver, ISO, and other styles

6

Johnson, Gani, Joshua Yakubu, Ago Mikyitsabu Atoshi, and Sarki Atoma-ti Emmanuel. "Extraction, Characterization and Application of Natural Dye Extract from Beetroot (Beta vulgaris) on Cotton Fabric." African Journal of Sciences and Traditional Medicine 1, no. 1 (2024): 207–20. https://doi.org/10.58578/ajstm.v1i1.3496.

Full text

Abstract:

Using a Soxhlet system, natural dye was extracted from beetroot (Beta vulgaris) and applied to cotton fabric. With the use of FT-IR, GC-MS, and UV-visible spectroscopy, the extracted dye was analyzed. On the cotton cloth that had been dyed, the properties of scouring, wash fastness, and light fastness were assessed. Using a mordant, the cotton fabric was treated with the natural dye extract. The dye extract has a red colour. According to the FTIR characterization data suggested the presence of N-H, C-H, C=C, C-H, C-N and C-Cl functional groups in the dye extract. Fifty one compounds were isola

APA, Harvard, Vancouver, ISO, and other styles

7

Gupta, Poonam, and Khayal Garg. "Study of preparation of Herbal indicator from selected flower parts for acid base titration: A Green Chemical Approach." Research Journal of Chemistry and Environment 28, no. 9 (2024): 30–32. http://dx.doi.org/10.25303/289rjce030032.

Full text

Abstract:

Suffering from the rapid depletion of the natural resource, the current world scenario calls for the need of sustainable development so as to obtain ecofriendly environment. Flowers impart beauty to the nature, pleasure to the heart and attract insects for pollination by their diversified colour, fragrance, shape and size. The variation in colour of flowers is due to the presence of pigments present in the petals or bracts. One of these pigments is anthocyanin which is a natural plant pigment. These pigments impart different colours in acidic and basic medium. This change in colour forms the b

APA, Harvard, Vancouver, ISO, and other styles

8

Saeidi, G., and G. G. Rowland. "The effect of temperature, seed colour and linolenic acid concentration on germination and seed vigour in flax." Canadian Journal of Plant Science 79, no. 3 (1999): 315–19. http://dx.doi.org/10.4141/p98-100.

Full text

Abstract:

In Canada, the edible-oil type of flax (Linum usitatissimum) known as solin must have a linolenic acid concentration of less than 5% and a yellow seed colour. The yellow seed distinguishes solin from regular, high-linolenic acid linseed flax. Both altered fatty acid ratios and seed colour can have a negative impact on seed germination. The effects of temperature, seed colour and seed linolenic acid concentration on germination and seed vigour were studied in four populations that were near-isogenic for seed colour and linolenic acid level. For all populations, a germination temperature of 5 °C

APA, Harvard, Vancouver, ISO, and other styles

9

Lemr, Karel, and Milan Kotouček. "Evaluation of colour changes of screened acid-base indicators." Collection of Czechoslovak Chemical Communications 54, no. 2 (1989): 346–60. http://dx.doi.org/10.1135/cccc19890346.

Full text

Abstract:

Based on computer-assisted calculations, six screened indicators were prepared and used for visual titration end point indication. Three of them were evaluated in terms of objective colour characteristics. Their colour changes were characterized in the CIE-xy (1931) international colorimetric system, by the Helmholtz coordinates, complementary Qx, Qy coordinates, perceptibility and course of the ΔJ/ΔpH = f(pH) function. In addition, new indices were introduced, viz. partial quality indices IE, Ip and Im, related with the colour difference between the two indicator species (IE), their colour pu

APA, Harvard, Vancouver, ISO, and other styles

10

Puminat, W. "Maintain the Chili Colour of a Sea-food Dipping Sauce in Product Processing." Food Science and Nutrition Studies 3, no. 4 (2019): p133. http://dx.doi.org/10.22158/fsns.v3n4p133.

Full text

Abstract:

Products of sea-food dipping sauce were prepared by sugar, water, acid, salt with chili and herbs. In the experiments, products were prepared and designed on a factor model for the study on the program. They were designed as factorial 4×2×4 by management with RBCD on conditions model of blanching, heating and cooling for the study on chili colour. The results of the experiments performed on physicochemical properties of product such as Brix 50.0-66.9 pH 3.52-4.29, Aw 0.814-0.879, solid content 2.80-5.75 g/100g, chlorophyll a 0.20-1.66, chlorophyll b 1.38-4.13. Colour value of products was L*29

APA, Harvard, Vancouver, ISO, and other styles

11

Saeidi, G., and G. G. Rowland. "The effect of autoclaving wilt nursery soil on emergence in flax." Canadian Journal of Plant Science 80, no. 4 (2000): 725–27. http://dx.doi.org/10.4141/p99-179.

Full text

Abstract:

Emergence of flax (Linum usitatissimum L) is affected by seed colour and seed linolenic acid concentration. The role of soil and soil microorganisms in this relationship was studied in near isogenic populations for seed colour and linolenic acid level. In growth chamber experiments, the emergence of flax from autoclaved soil was greater than from non-autoclaved soil. This effect was greater for yellow seed than brown seed. Seed with high (50%) levels of linolenic acid had greater emergence than seed with low (2%) levels of linolenic acid in both soil types. The protective effect of brown seed

APA, Harvard, Vancouver, ISO, and other styles

12

Zhao, Guang Yuan, Yang Chang, and Wei Zong. "Studies on the Quality Change of Cloudy Jujube Juice during Storage." Advanced Materials Research 634-638 (January 2013): 1537–41. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.1537.

Full text

Abstract:

120 day storage experiment at 4°C, 25°C and 37°C of Cloudy Jujube Juice was conducted. The content of polyphenols, ascorbic acid, and the colour were assessed by analysis techniques. During the storage period of juice, the L* value decreased and the a*value increased with prolonged storage time and increased temperature. The degree of color changing as well as the loss of tannin and ascorbic acid in the juice increased as the prolonged storage time and increased temperatures. The colour change (△E) of juice during the storage was caused mainly by the degradation of ascorbic acid and the oxidat

APA, Harvard, Vancouver, ISO, and other styles

13

Grundy, J. R. "A colour atlas of acid etch technique." Journal of Dentistry 14, no. 1 (1986): 45. http://dx.doi.org/10.1016/0300-5712(86)90107-7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Birman, Birman, S. Hafidhawati Andarias, and Agus Slamet. "Natural dye plants for buton woven fabric in Wabula Village, Buton District." Jurnal Biolokus 7, no. 1 (2024): 39. https://doi.org/10.30821/biolokus.v7i1.1365.

Full text

Abstract:

This study aims to document the species and parts of plants, processing, and colours produced in the dyeing process of Buton woven fabrics. The research was conducted in July-October 2019. The method used was descriptive-qualitative through observation and interviews with 30 weaving crafters in Wabula Village, Buton Regency. Data were analysed by descriptive analysis. The results showed that the plants used were the leaves and stems of tarum (<em>Indigofera tinctoria</em> L.) to get blue colour, jackfruit stems (<em>Artocarpus heterophyllus</em> L.) to get brown colour,

APA, Harvard, Vancouver, ISO, and other styles

15

Damia Fakhira Abdul Halim, Arnida Hani Teh, and Haslaniza Hashim. "Antioxidant and Colour in Selected Local Fruits." Journal Of Agrobiotechnology 15, S1 (2024): 98–109. http://dx.doi.org/10.37231/jab.2024.15.s1.378.

Full text

Abstract:

Fruit pigments are associated with the presence of antioxidants. This study determined the content of antioxidant components (total phenolic content (TPC), ascorbic acid, beta carotene and lycopene) and colour in selected local fruits (papaya, watermelon, dragon fruit, wax apple, and jackfruit). The TPC, ascorbic acid, beta carotene and lycopene were determined spectrophotometrically. Ascorbic acid content was determined using the 2,6-Dichlorophenolindophenol (DCPIP) titration method. Colour was assessed by tristimulus colorimetry based on the reflection spectrum. Total soluble solids (TSS) we

APA, Harvard, Vancouver, ISO, and other styles

16

Didja, Pascaline, Gilles Nkouam, Musongo Balike, et al. "Optimization of Raw Material, Decolourizing Earth and Temperature Use in the Decolourization of Palm Oil." American Journal of Chemical Engineering 13, no. 1 (2025): 20–35. https://doi.org/10.11648/j.ajche.20251301.13.

Full text

Abstract:

The objective of this study was to evaluate the influence of raw material, decolourizing earth and temperature on the colour of bleached palm oil. Two types of decolourizing earth (American and Indian) were used. A four-factor centered composite response surface design was used to determine the effects of the different mentioned factors on the colour response of bleached palm oil at two DOBIs (2.3 and 1.3). The results obtained indicate that Indian earth with DOBI 2.3 oil has the colour variation contour lines at the high level of 16.0 red and at low level of 15.3 red. The decrease in colour a

APA, Harvard, Vancouver, ISO, and other styles

17

Sehrawat, Rachna, Paramjit S. Panesar, Tanya L. Swer, and Anit Kumar. "Response surface methodology (RSM) mediated interaction of media concentration and process parameters for the pigment production by Monascus purpureus MTCC 369 under solid state fermentation." Pigment & Resin Technology 46, no. 1 (2017): 14–20. http://dx.doi.org/10.1108/prt-08-2015-0077.

Full text

Abstract:

Purpose This paper aims to extract colour from micro-organisms (as a source of natural pigments) using agro-industrial substrates to replace synthetic media by solid state fermentation. Nature is filled with colours. Due to health and environmental consciousness among people, use of synthetic colour has declined, and so the need to develop colour from cheap and easily available natural sources (plants, animals, micro-organisms and algae) using a cost-effective technique with higher yield and rapid growth. Monascus purpureus colour is a potent source of compounds (Dimerumic acid, Monacolin-k an

APA, Harvard, Vancouver, ISO, and other styles

18

Soares, Juliana Breda, João Finamor, Fabio Pinto Silva, Liane Roldo, and Luis Henrique Cândido. "Analysis of the influence of polylactic acid (PLA) colour on FDM 3D printing temperature and part finishing." Rapid Prototyping Journal 24, no. 8 (2018): 1305–16. http://dx.doi.org/10.1108/rpj-09-2017-0177.

Full text

Abstract:

Purpose This paper aims to analyse the effect of different polylactic acid (PLA) colours used on fused deposition modelling (FDM), considering the product finishing quality produced with the same process conditions. Design/methodology/approach The methodology adopted was to design a virtual modelling object and three-dimensional (3D) print it with FDM with different PLA colours (natural, green and black), using the same parameters. 3D scanning and scanning electron microscopy was used to analyse the model finishing of each sample. Fourier-transform infrared spectroscopy analysis, thermogravime

APA, Harvard, Vancouver, ISO, and other styles

19

Stojkoski, Viktor, and Mateja Kert. "Design of pH Responsive Textile as a Sensor Material for Acid Rain." Polymers 12, no. 10 (2020): 2251. http://dx.doi.org/10.3390/polym12102251.

Full text

Abstract:

The chemical composition of rainwater can serve as an indicator of the excess of acidifying air pollutants. The pH value of rainwater in the presence of sulphur dioxide and nitrogen oxides, the precursors of acid rain, falls below pH 5.6, which is the limit value for acid rain. In this research, the tailoring of halochromic textile was examined for the design of a functional textile that can serve as a sensor and inform the wearer about the presence of pollutants in the air by means of an immediate colour change. For this purpose, a polyamide 6 fabric was dyed with the pH-sensitive Bromocresol

APA, Harvard, Vancouver, ISO, and other styles

20

Saguer, E., S. Altarriba, C. Lorca, D. Parés, M. Toldra`, and C. Carretero. "Colour Stabilization of Spray-Dried Porcine Red Blood Cells Using Nicotinic Acid and Nicotinamide." Food Science and Technology International 9, no. 4 (2003): 301–7. http://dx.doi.org/10.1177/108201303036092.

Full text

Abstract:

The effect of nicotinic acid (NA) and nicotinamide (NAm) on colour parameters (CIE L*, a*, b*) of spray dried red blood cells and colour stability during a 7-weeks storage period at room temperature were investigated. The influence of pH on the colour of powder stabilized with NA or NAm was also determined by using starch gels as a model matrix. The results showed that nicotinic acid at 2% (w/v) considerably prevented colour deterioration of haemoglobin concentrate during spray-drying as well as during the storage period. The powder obtained was clearer, redder and more yellow than the control

APA, Harvard, Vancouver, ISO, and other styles

21

Lee, S. V., A. N. Hadi, Z. H. Z. Zainal Abidin, et al. "Thermal and UV degradation of roselle anthocyanin extract and its mixtures with poly(vinyl alcohol) in different acid." Pigment & Resin Technology 44, no. 2 (2015): 109–15. http://dx.doi.org/10.1108/prt-03-2014-0025.

Full text

Abstract:

Purpose – The purpose of this paper is to observe the colour and thermal stability of natural red dye consisting of anthocyanin with addition of different aqueous acids and applied as coating films. Design/methodology/approach – The natural red dye was extracted from Hibiscus sabdariffa L. (roselle) flowers and mixed with 1 per cent hydrochloric acid, 5 per cent acetic acid, 5 per cent citric acid and 5 per cent oxalic acid. All the dye samples were exposed to heat and UV-B to observe the colour stability by calculating the half-life and rate of reaction. In coating film application, each of t

APA, Harvard, Vancouver, ISO, and other styles

22

Mínguez-García, David, Pablo Díaz-García, Jaime Gisbert-Payá, and Marilés Bonet-Aracil. "Emulsion Nanofibres as a Composite for a Textile Touch Sensor." Polymers 15, no. 19 (2023): 3903. http://dx.doi.org/10.3390/polym15193903.

Full text

Abstract:

The combination of a nanofibre net and textile support represents an interesting composite capable of conferring various properties. Nanofibres are so thin that they can be easily damaged by human touch. In this study, we hypothesised that dyeing nanofibres with different colours from their textile supports would result in a colour difference upon their degradation, providing evidence that the composite has been touched and acting as a touch sensor. Two different methods were studied: directly inserting the dye into the polymer via electrospinning or creating a coloured liquid emulsion encapsu

APA, Harvard, Vancouver, ISO, and other styles

23

McCune, Bruce, Wilmer H. Perera, Xinhui Yu, and Kerry McPhail. "Visualizing usnic acid with anisaldehyde reagent." Lichenologist 56, no. 5 (2024): 193–200. https://doi.org/10.1017/s002428292400015x.

Full text

Abstract:

AbstractThe pale yellowish tint of usnic acid in a lichen thallus itself is a commonly used character in identification keys, particularly in the genus Cladonia. Furthermore, the presence of usnic acid is phylogenetically significant in numerous groups of lichens. While the distinctive colour of usnic acid is readily visible when present in high concentrations, it is commonly problematic to discern when in low to moderate concentrations. We explored the use of an anisaldehyde reagent for visualizing usnic acid. Using both usnic acid-containing Cladonia samples and pure usnic acid, this reactio

APA, Harvard, Vancouver, ISO, and other styles

24

Saeidi, G., and G. G. Rowland. "Seed colour and linolenic acid effects on agronomic traits in flax." Canadian Journal of Plant Science 79, no. 4 (1999): 521–26. http://dx.doi.org/10.4141/p99-019.

Full text

Abstract:

Solin flax (Linum usitatissimum L.) is an edible-oil crop that must have less than 5% linolenic acid in its seed oil and a yellow seed coat. Seed vigour of solin is often lower than that of brown-seeded linseed flax and this lower seed vigour has been associated with both seed colour and linolenic acid levels. To evaluate the agronomic affect of this relationship, paired near-iso-genic populations of flax differing in seed coat colour and linolenic acid concentration were selected from different crosses and sown in field trials at the Kernen Crop Research Farm, University of Saskatchewan in 19

APA, Harvard, Vancouver, ISO, and other styles

25

Jain, Vinod K., Shibu G. Pillai, and Parin H. Kanaiya. "Synthesis of Calix[4]resorcinarene Based Dyes and its Application in Dyeing of Fibres." E-Journal of Chemistry 5, s1 (2008): 1037–47. http://dx.doi.org/10.1155/2008/980290.

Full text

Abstract:

Four new ʻupper rimʼ azocalix[4]resorcinarene have been synthesized by coupling calix[4]resorcinarene with different diazotized aromatic compounds of sulphanilic acid, anthranilic acid,o-aminophenol andp-aminobenzoic acid. The prepared compounds were characterized based on m.p., elemental analysis, FT-IR,1H-NMR. These dyes have been used for the dyeing of textile fibres like cotton and wool. Their fastness properties such as fastness to sunlight, water, washings, and perspiration have also been studied. The synthesized dyes have been employed for computerized colour strength determination thro

APA, Harvard, Vancouver, ISO, and other styles

26

P, Adhiyaman, Kanchana S, and Hemalatha G. "Extraction, Stabilistiaon and Utilisation of Natural Food Colours from Grape Fruit Rind." Madras Agricultural Journal 99, December (2012): 905–9. http://dx.doi.org/10.29321/maj.10.100224.

Full text

Abstract:

Investigation was carried out to develop natural food colour powder from grape fruit rind (waste) by spray drying. The colour was extracted with water and solvents viz., acetone, ethanol and citric acid. The experimental results showed that the 3 % citric acid extraction was best and the filtrate was spray dried at different drying air temperature (180, 200 and 220ºC) and flow rate (25 and 30 ml / min) using 10, 15 and 20 % of maltodextrin (MD). The yield recovery was maximum at 200ºC with a flow rate of 25 ml / min at 20 % maltodextrin. The stability of the colour was analysed by exposing the

APA, Harvard, Vancouver, ISO, and other styles

27

Neacsa, Ana, Dan Macarovici, and Vasile Cerghizan. "Study Concerning the Qualitative Improvement of Formic Acid and Sodium Formate." Revista de Chimie 59, no. 1 (2008): 37–40. http://dx.doi.org/10.37358/rc.08.1.1702.

Full text

Abstract:

The technical grade formic acid containing iron ions under the maximum limits (0,015 % Fe) presents sometimes a pink colour affecting the quality. In order to eliminate this colour the formic acid solution was passed through several absorbents. Among those, the best proved to be the cationite C 100 H. The pink colour dissapears at an iron content below 0,002% Fe. The crystalline powder of the technical grade sodium formate become agglomerate by the absorbtion of the atmospheric humidity. This phenomenon may be prevented by covering the crystals with a sodium stearate film (0,5 � 0,1 % sodium s

APA, Harvard, Vancouver, ISO, and other styles

28

Patgiri, Rupam, Bapan Saha, Nilpawan Sarma, Ziaur Rahman, and Ruhul Amin Bepari. "Theoretical Validation of Reversible Acidochromism of a Cinnamaldehyde based Scaffold with Experimental Investigations." Asian Journal of Chemistry 36, no. 4 (2024): 837–43. http://dx.doi.org/10.14233/ajchem.2024.30911.

Full text

Abstract:

Present study explores the reversible acidochromism displayed by cinnamaldehyde derivative-based scaffold (P1), which is highly sensitive to variations in acidity and basicity. Upon exposing to an acidic environment, the solution containing P1 undergoes a vivid colour shift from yellow to a vibrant pink-fuchsia colour due to the conversion of imine within P1 into its quinonoid form. The color change can be completely reversed by adding a basic material, demonstrating the reversible acidochromic behavior of the P1 system. Moreover, the practical application of this acidochromic property is demo

APA, Harvard, Vancouver, ISO, and other styles

29

Herranz, J. L., R. Arteaga, and J. A. Armijo. "Change in Hair Colour Induced by Valproic Acid." Developmental Medicine & Child Neurology 23, no. 4 (2008): 386–87. http://dx.doi.org/10.1111/j.1469-8749.1981.tb02006.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Herranz, J. L., R. Arteaga, and J. A. Armijo. "Change in Hair Colour Induced by Valproic Acid." Developmental Medicine & Child Neurology 23, no. 3 (2008): 386–87. http://dx.doi.org/10.1111/j.1469-8749.1981.tb02473.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Damian, Cristina, and Mircea Oroian. "Effect of thermal treatment on antioxidant activity and colour of carrot purées." Analele Universitatii "Ovidius" Constanta - Seria Chimie 24, no. 1 (2013): 35–38. http://dx.doi.org/10.2478/auoc-2013-0007.

Full text

Abstract:

AbstractTotal antioxidant activity, levels of bio-active compound groups and instrumental colour of carrot purée subjected to thermal treatment (70°C/2 min) were measured. The method applied to the dosage of ascorbic acid was with 2,6-diclorophenolindophenol. Total phenols (TP) in purée were determined using the Folin- Ciocalteau method and antioxidant activity by the use of DPPH free radical method. The colour of the samples was measured using a Hunter-Lab colour meter. Heat treatment caused a rapid decrease in ascorbic acid. Phenolic contents were in general unaffected by thermal treatment.

APA, Harvard, Vancouver, ISO, and other styles

32

Hendriks, W. H., M. F. Tarttelin, and P. J. Moughan. "The amino acid composition of cat (Felis catus) hair." Animal Science 67, no. 1 (1998): 165–70. http://dx.doi.org/10.1017/s1357729800009905.

Full text

Abstract:

AbstractThe amino acid composition of cat hair was determined by conventional 24-h acid hydrolysis and non-linear least-squares extrapolation to time zero of the amino acid composition data from a series of hydrolysis intervals. Twenty-five individual samples of cat hair, consisting of four colours, were also analysed (24-h hydrolysis) to determine if there was an effect of hair colour on amino acid composition. Amino acids were determined following HCl hydrolysis (6 mol/l) with cysteine and methionine determined by performic acid oxidation of the sample prior to hydrolysis.There was no signif

APA, Harvard, Vancouver, ISO, and other styles

33

Yuan, Jiang-Feng, Yu-Ting Lai, Zhuo-Yao Chen, et al. "Microwave Irradiation: Effects on the Change of Colour Characteristics and Main Phenolic Compounds of Cabernet Gernischt Dry Red Wine during Storage." Foods 11, no. 12 (2022): 1778. http://dx.doi.org/10.3390/foods11121778.

Full text

Abstract:

Wine colour is an essential organoleptic property considered by consumers. In this paper, the potential effects on colour characteristics and the content of main phenolic compounds in red wine under microwave irradiation were investigated during wine storage. The results showed that the changing trend of colour characteristics of microwave-treated and untreated wines was very similar. Moreover, total phenolic compounds, total monomeric anthocyanins, main anthocyanins, main flavonoids, and main phenolic acids (gallic acid; caffeic acid; syringic acid; (+)-catechin; Cy-3-glu; Mv-3-glu) also show

APA, Harvard, Vancouver, ISO, and other styles

34

Bernava, Aina. "The Use of Disperse Dyes for Dyeing of Recycled Polyethylene Terephthalate Fibres." Key Engineering Materials 903 (November 10, 2021): 100–105. http://dx.doi.org/10.4028/www.scientific.net/kem.903.100.

Full text

Abstract:

Recycled polyethylene terephthalate (r-PET) is a widely recycled plastic employed for new textile production in the world. It reduces environmental impact and lowers cost of the production. For the traditional dyeing of polyethylene terephthalate (PET), commercial disperse dyes are generally used. In presented research the recycled r-PET fibres 6 den dyeing with disperse dyes Itosperse: Red, Blue and Yellow (concentration 3 Wt. %) were examined and the influence of the intensifier of a salicylic acid (with concentration of 4 - 10 g/L) in dye bath was investigated. The colour properties of dyed

APA, Harvard, Vancouver, ISO, and other styles

35

Budiarto, Kurniawan, Lizia Zamzami, and Otto Endarto. "Effect of salicylic and ascorbic acids on post-harvest vase life of Chrysanthemum cut flowers." Horticultural Science 49, No. 1 (2022): 38–47. http://dx.doi.org/10.17221/151/2020-hortsci.

Full text

Abstract:

Flower vase life is one important aspect in determining the flower quality in the cut flower chrysanthemum. The use of ascorbic or salicylic acid as preservative solutions was expected to have an impact on the prolonged duration of the cut flower freshness. The research was designed in two parallel experiments. The first dealt with salicylic acid, while the second focused on ascorbic acid. Both experiments were arranged in a factorial completely blocked randomised design. Two chrysanthemum varieties, i.e., ‘Reagent Sunny’ and ‘Yellow <br />Fiji’ were the first factor and concentrations o

APA, Harvard, Vancouver, ISO, and other styles

36

Woods, D. L., and G. Séguin-Swartz. "An investigation on linkage between white flower colour and erucic acid in summer rape." Canadian Journal of Plant Science 78, no. 1 (1998): 109–11. http://dx.doi.org/10.4141/p96-151.

Full text

Abstract:

A dominant gene for white flower colour, derived from Brassica albogabra, is shown to be closely linked to a gene for seed erucic acid in summer rape (Brassica napus). This observation conflicts with a previous report on material of the same origin, where independent inheritance of these characters was reported. Key words: Brassica napus, flower colour, erucic acid, linkage, summer rape

APA, Harvard, Vancouver, ISO, and other styles

37

Umar, Mohammed, Aliyu El-Hassan, Dahiru Umar, and Saidu Abubakar. "THE USE OF Cassia sieberiana DC FLOWER EXTRACT AS AN INDICATOR IN ACID-BASE TITRATION." International Journal of Recent Research in Physics and Chemical Sciences (IJRRPCS) 10, no. 2 (2024): 83–85. https://doi.org/10.5281/zenodo.10656878.

Full text

Abstract:

<strong>Abstract:</strong> An Indicator is an organic substance which shows a wide range of colour changes depending on the relative proportion of hydrogen or hydroxide ions present in solution of that substance. In long search for less hazardous and eco-friendly chemical substances from natural products several scientists had extensively work on the use of flower extract as indicators and has proof to be effective. About 40g each of the flower petals were washed and grounded in a mortar with a pestle, and transferred into two different beakers one containing 400cm<sup>3</sup> of ethanol and t

APA, Harvard, Vancouver, ISO, and other styles

38

Mäthger, Lydia M., Steven B. Roberts, and Roger T. Hanlon. "Evidence for distributed light sensing in the skin of cuttlefish, Sepia officinalis." Biology Letters 6, no. 5 (2010): 600–603. http://dx.doi.org/10.1098/rsbl.2010.0223.

Full text

Abstract:

We report that the skin of cuttlefish, Sepia officinalis , contains opsin transcripts suggesting a possible role of distributed light sensing for dynamic camouflage and signalling. The mRNA coding for opsin from various body regions was amplified and sequenced, and gene expression was detected in fin and ventral skin samples. The amino acid sequence of the opsin polypeptide that these transcripts would produce was identical in retina and fin tissue samples, but the ventral skin opsin transcripts differed by a single amino acid. The diverse camouflage and signalling body patterns of cephalopods

APA, Harvard, Vancouver, ISO, and other styles

39

NOUR, Violeta, Mira Elena IONICA, and Ion TRANDAFIR. "Bioactive Compounds, Antioxidant Activity and Color of Hydroponic Tomato Fruits at Different Stages of Ripening." Notulae Botanicae Horti Agrobotanici Cluj-Napoca 43, no. 2 (2015): 404–12. http://dx.doi.org/10.15835/nbha43210081.

Full text

Abstract:

This experiment was carried out in order to study the simultaneous effect of on-vine ripening and examined cultivars on fruit quality, color development and antioxidant content in two different types of tomatoes. â€˜Admiroâ€™ and â€˜Kometâ€™ (normal average fruit weight) and â€˜Cheramyâ€™ (cherry type) cultivars grown in hydroponic culture were used. Dry matter, soluble solids, titratable acidity, ascorbic acid, lycopene, b-carotene, total phenolic, total flavonoid content and hydrophilic antioxidant activity were measured in six ripening stages. Color of fruits was determined by CIELab system

APA, Harvard, Vancouver, ISO, and other styles

40

Saito, Koshi, and Kei-Ichi Miyamato. "Alginic acid and hyaluronic acid, effective stabilizers of carthamin red colour in aqueous solutions." Acta Societatis Botanicorum Poloniae 63, no. 2 (2014): 185–86. http://dx.doi.org/10.5586/asbp.1994.025.

Full text

Abstract:

Sodium salts and free forms of two heterosaccharides, alginic and hyaluronic acids were mixed with carthamin in a buffer at pH 5.5 and their preservation effects of carthamin red colour were screened after incubation for 24 h at 3-5<sup>o</sup>C in the dark. The effects observed were (alginic acid/hyaluronic acid, % on average): 69.3/60.3, for which the values are higher by 40.9 and 29.1%, respectively, compared with those of the control which was conducted with no addition of heterosaccharides. Alginic acid is a more promising stabilizer than haluronic acid, indicating that active

APA, Harvard, Vancouver, ISO, and other styles

41

Renita, A. Annam, S. Sai Bhargav, and Evin Joy. "Advanced Oxidation Process by Electro-Fenton Reagent." Advanced Materials Research 984-985 (July 2014): 159–63. http://dx.doi.org/10.4028/www.scientific.net/amr.984-985.159.

Full text

Abstract:

This paper deals with the advanced oxidation using Electro-fenton reagent for the degradation of azo-dyes in textile effluents. Discharge of textile effluents causes inevitable pollution of water resources which calls for further treatment methods. In this experiment, textile effluent samples were treated with iron electrodes with the reagents, hydrogen peroxide and ferrous sulfate .The acid dye effluents which were used in this study are Acid Orange 7, Acid Red 88, and Acid Violet 7. The temperature was set to 40° C. Samples of 20 ml were analyzed for Biological Oxygen Demand (BOD), Chemical

APA, Harvard, Vancouver, ISO, and other styles

42

Student. "YELLOW SKIN A BETTER PREDICTOR?" Pediatrics 84, no. 6 (1989): A45. http://dx.doi.org/10.1542/peds.84.6.a45a.

Full text

Abstract:

If kernicterus develops in an infant due to high serum bilirubin, low reserve albumin, and acidosis, bilirubin acid will also be deposited in the skin. In consequence, it seems possible that the yellow colour of the skin is correlated with that of the brain, to the extent that bilirubin deposition in the skin has occurred by precipitation of bilirubin acid. If so, the intensity of the yellow colour of the skin may be a somewhat better predictor of brain damage than the serum bilirubin concentration and measurement of the colour of the skin may theoretically be of clinical utility.

APA, Harvard, Vancouver, ISO, and other styles

43

Hudecová, Agáta, Marcela Hricová, Mária Petková, Roderik Plavec, Zita Tomčíková, and Anna Ujhelyiová. "Colour masterbatches and their use in polylactic acid fibres dyeing." Acta Chimica Slovaca 16, no. 1 (2023): 62–72. http://dx.doi.org/10.2478/acs-2023-0006.

Full text

Abstract:

Abstract This article is focused on the preparation of colour masterbatches from renewable sources based on polylactic acid, which were modified with inorganic pigments. Titanium dioxide, carbon black, and iron oxides were used as inorganic pigments. Due to the composition of the prepared colour PLA masterbatches, the influence of the inorganic pigment on the rheological and thermal properties was monitored. Rheological properties were determined using a capillary viscosimeter and a rotary rheoviscosimeter with a geometry plate/plate. The colour PLA masterbatches prepared in this way were subs

APA, Harvard, Vancouver, ISO, and other styles

44

Akinoso, R., SA Aboaba, and WO Olajide. "Optimization of roasting temperature and time during oil extraction from orange (Citrus sinensis) seeds: A response surface methodology approach." African Journal of Food, Agriculture, Nutrition and Development 11, no. 47 (2011): 5300–5317. http://dx.doi.org/10.18697/ajfand.47.10625.

Full text

Abstract:

Nutritionally, oils obtained from oilseeds provide the calories, vitamins and essential fatty acids in the human diet in an easily digested form. The rate of vegetable oil consumption is increasing compared with animal fat due to its low sterol. In addition to being nutritious, edible vegetable oils also have industrial uses. Separation of oil from oil seeds is an important processing operation because it affects the quality and quantity of oil obtained from the oil seeds. Literature on oil extraction from some cultivars of citrus seeds showed good potential, therefore, focus on optimization o

APA, Harvard, Vancouver, ISO, and other styles

45

Cordero, A. Punta, F. J. Barragán de la Rosa, and A. Guiraum. "Spectrophotometric determination of sulfanilic acid and sulfonamides in pharmaceutical samples with potassium 1,2-naphthoquinone-4-sulfonate." Canadian Journal of Chemistry 67, no. 10 (1989): 1599–605. http://dx.doi.org/10.1139/v89-244.

Full text

Abstract:

An accurate and simple method is proposed for the determination of sulfanilic acid in the presence of sulfonamides. This method is based on measuring the intensity of the red colour that develops when sulfanilic acid is allowed to react with potassium 1,2-naphthoquinone-4-sulphonate (NS) in a chloroaceticchloroacetate buffer at pH 3,4. Colour development reaches completion after 2 h, allowing sulfanilic acid to be quantified spectrophotometrically at 470 nm (ε = 4.7 × 103 L mol−1 cm−1). The main product causing colour formation, potassium 1,2-naphthoquinone-4-(N-aminophenylen-4-sulphonate) (NS

APA, Harvard, Vancouver, ISO, and other styles

46

Guerrero-Beltrán, J. A., B. G. Swanson, and G. V. Barbosa-Cánovas. "High Hydrostatic Pressure Processing of Mango Puree Containing Antibrowning Agents." Food Science and Technology International 11, no. 4 (2005): 261–67. http://dx.doi.org/10.1177/1082013205056401.

Full text

Abstract:

Natural mango puree and purees containing cysteine ( Cys, 200 ppm) or ascorbic acid ( AA, 500ppm) were treated at high hydrostatic pressure, HHP (379 to 586 MPa) for selected times (0, 0.033, 5, 10, 15 and 20min) to assess changes in polyphenoloxidase (PPO) activity. Mango purees were stored at 31°C. Colour parameters ( L*, a* and b*) were analysed to evaluate colour stability. PPO activity was inhibited from 93.8 to 89.7 or 85.5 enzyme activity units (EAU) after adding AAor Cys, respectively. Such inhibition was improved after applying HHP, by an average of 69.5± 10.6, 4.2 ± 2.2 and 47.0 ± 35

APA, Harvard, Vancouver, ISO, and other styles

47

Kantouch, F., and A. Ragheb. "Preparation and Characterisation of Polyacrylic Acid Leucaena Gum as a Thickener in Reactive Dye Printing Pastes." Engineering Plastics 5, no. 2 (1997): 147823919700500. http://dx.doi.org/10.1177/147823919700500207.

Full text

Abstract:

Polyacrylic acid-leucaena gum was prepared by the polymerisation of acrylic acid on leucaena gum using potassium persulphate as initiator. The rheological properties of the gums and their utilisation as thickening agents in printing cotton fabrics with reactive dyes were investigated. It was found that polyacrylic acid-leucaena gum pastes are characterised by a non-Newtonian pseudoplastic behaviour. The apparent viscosity depends on the amount of acrylic acid. Cotton fabric samples printed with cibacron blue 3R acquire soft handle and colour fastness properties nearly identical with those prin

APA, Harvard, Vancouver, ISO, and other styles

48

Kantouch, F., and A. Ragheb. "Preparation and Characterisation of Polyacrylic Acid Leucaena Gum as a Thickener in Reactive Dye Printing Pastes." Polymers and Polymer Composites 5, no. 2 (1997): 139–44. http://dx.doi.org/10.1177/096739119700500207.

Full text

Abstract:

Polyacrylic acid-leucaena gum was prepared by the polymerisation of acrylic acid on leucaena gum using potassium persulphate as initiator. The rheological properties of the gums and their utilisation as thickening agents in printing cotton fabrics with reactive dyes were investigated. It was found that polyacrylic acid-leucaena gum pastes are characterised by a non-Newtonian pseudoplastic behaviour. The apparent viscosity depends on the amount of acrylic acid. Cotton fabric samples printed with cibacron blue 3R acquire soft handle and colour fastness properties nearly identical with those prin

APA, Harvard, Vancouver, ISO, and other styles

49

Arkan, N. D., T. Setyawardani, and A. H. D. Rahardjo. "Physicochemical and functional properties of yoghurt made of cow milk, colostrum, and milk-colostrum combination." Food Research 6, no. 1 (2022): 188–95. http://dx.doi.org/10.26656/fr.2017.6(1).120.

Full text

Abstract:

Yoghurt made from milk, colostrum and their combination are one of the innovations in product development. Colostrum is rich in nutrients that can be used as a functional food ingredient. This study aimed to analyze the physicochemical properties (colour, total solids, and fatty acids) and functional properties (antioxidant activity and fatty acid profile) of yoghurt made of additional colostrum. Colostrum is rich in nutrients for functional food ingredients. A total of six treatments of yoghurt made with milk-colostrum mixture (100:0%, 80:20%, 60:40%, 40:60%, 20:80% and 0:100%) added. Each tr

APA, Harvard, Vancouver, ISO, and other styles

50

Giuffrè, Angelo Maria, Manuela Caracciolo, Marco Capocasale, Clotilde Zappia, and Marco Poiana. "Effects of Shortening Replacement with Extra Virgin Olive Oil on the Physical–Chemical–Sensory Properties of Italian Cantuccini Biscuits." Foods 11, no. 3 (2022): 299. http://dx.doi.org/10.3390/foods11030299.

Full text

Abstract:

Olive oil is recognised for its beneficial effects on human health, mainly due to it containing oleic acid (a monounsaturated fatty acid), whereas fats of animal origin or margarine, which are often used in recipes for biscuit production, contain mainly saturated fatty acids. The aim of this study was to evaluate the shelf-life and physicochemical properties of biscuits and of the fats contained in original recipe Italian Cantuccini biscuits (50% cow’s butter and 50% margarine). Additionally, the sensory properties of the biscuits were evaluated, including their colour, appearance, taste, flav

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!