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1 – 10 of 47Monthon Nakpathom, Buppha Somboon, Nootsara Narumol and Rattanaphol Mongkholrattanasit
The purpose of this study is to investigate the possibility of dyeing polyester (PET) fabric with natural dye extracted from annatto seeds using high temperature dyeing method.
Abstract
Purpose
The purpose of this study is to investigate the possibility of dyeing polyester (PET) fabric with natural dye extracted from annatto seeds using high temperature dyeing method.
Design/methodology/approach
PET fabric was dyed with annatto extract by varying dyeing parameters (temperature, time, pH and dye concentration) to determine the optimum dyeing conditions. The influences of KAl(SO4)2, FeSO4, gallnut mordants or a commercial UV absorber on colour yield and fastness properties were further studied.
Findings
Optimum results were obtained when the fabric was dyed at 130°C for 30 min in a dyebath containing 15 per cent (owf) annatto dye at pH 6. The dyed fabric had an orange shade and exhibited good to excellent wash, crock, perspiration fastness and fair light fastness. Further dyeing with mordants or UV absorber mostly resulted in lower colour yield and similar fastness properties.
Research limitations/implications
Although the light fastness was slightly improved to moderate level for the sample with UV absorber, a noticeable colour staining on cotton portion of multi-fibre fabric occurred when subjected to standard washing test. Compared to C.I. Disperse Orange 73, the annatto dye exhibited comparable colour fastness but had inferior light fastness when dyed at approximately the same colour strength.
Originality/value
Natural colourants from annatto seeds can be used to dye PET fabric at high temperature without mordants, yielding deep orange shade and satisfactory fastness properties. This study provides a promising application to reduce the environmental impact of synthetic dyes.
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Simone Alves Monteiro da Franca, Rodrigo Nunes Cavalcanti, Marta S. Madruga, Deyse Alves Pereira, Cristiani Viegas Brandão Grisi, Marciane Magnani, Geany Targino de Souza Pedrosa and Carolina Lima Cavalcanti de Albuquerque
The objective of this study was to evaluate the technical-economic process efficiency of obtaining simultaneous lipo-soluble (LSF) and water-soluble (WSF) fractions from annatto…
Abstract
Purpose
The objective of this study was to evaluate the technical-economic process efficiency of obtaining simultaneous lipo-soluble (LSF) and water-soluble (WSF) fractions from annatto seeds.
Design/methodology/approach
The batches of annatto seeds were submitted to the refrigerated solid-liquid extraction process in four stages: pre-extraction, aqueous extraction, separation by decantation and filtration. After that, LSF and WSF from annatto seeds were obtained. The process efficiency and the quality of LSF and WSF were analyzed in terms of average yield and bioactive compounds (bixin, norbixin, phenolics and flavonoids) and their antioxidant and antimicrobial activities. Furthermore, they were economically evaluated in terms of costs of manufacturing and profitability parameters.
Findings
The process was efficient in terms of overall average yield (LSF = 8.68% and WSF = 2.76%) (w/w) and in terms of quality, mainly with higher average yields of bixin (82.34% in LSF) and norbixin (29.59% in WSF) (w/w). The concentration of bioactive compounds in the fractions promoted an increase in inhibiting free radicals (DPPH* and ABTS*+) and in the ferric-reducing power (FRAP). LSF showed a minimum inhibitory concentration of 0.06 mg mL-1 for S. aureus and 0.13 mg mL-1 for S. Typhimurium and S. Enteritidis. The lowest manufacturing costs were obtained for the LSF due to its higher extraction yield compared to the WSF. Plants on an industrial scale of 100 and 1000 L were considered economically viable, with a return on investment of 5 and 2 years.
Originality/value
Thus, fractions (WSF and LSF) can be applied as natural additives, as sources of bioactive compounds for nutraceutical and/or pharmaceutical, and in the development of other innovative processes. These results have practical applicability for pharmaceutical and food industry.
Highlights
Green processing of annatto seeds obtains fractions rich in antioxidant compounds.
Efficiently presents a high yield of bixin and other bioactive compounds.
Effective in concentrating compounds that inhibit microbial growth.
Fractions are more accessible sources of bioactive compounds for isolation.
Cost of manufacturing (COM) and profitability are studied.
Green processing of annatto seeds obtains fractions rich in antioxidant compounds.
Efficiently presents a high yield of bixin and other bioactive compounds.
Effective in concentrating compounds that inhibit microbial growth.
Fractions are more accessible sources of bioactive compounds for isolation.
Cost of manufacturing (COM) and profitability are studied.
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Padma S. Vankar and Afreen Begum
Replacing conventional mordants by benign mordants, rare earth (RE) salts have been used in the process of natural dyeing with annatto seed extract. The purpose was threefold …
Abstract
Purpose
Replacing conventional mordants by benign mordants, rare earth (RE) salts have been used in the process of natural dyeing with annatto seed extract. The purpose was threefold – first, to increase the dye uptake through these new mordants; second, to have better fastness properties of dyed swatches and third, to have lesser effluent pollution, as the new RE mordants are used in one-tenth quantities only.
Design/methodology/approach
Sustainable natural dyeing was attained by using RE salts as mordant in one-tenth quantity, for natural dyeing, replacing the conventional mordants such as alum and ferrous sulphate. Annatto extract has been used as natural dye.
Findings
Through the study, it was inferred that the natural dyeing using annatto seed extract gives very good colour depth on the dyed swatches and also shows marked improvement in fastness properties.
Research limitations/implications
Research implication is that often it is expected that any new chemical used in the textile processing adds on to the effluent load; however, contrary to that, this study found that the use of RE salt is very beneficial as it is used in smaller quantities, but gives far better dyeing results.
Practical implications
RE salts can be used in natural dyeing without causing any harm to the environment and dyers.
Social implications
Use of RE salts in natural dyeing is a new concept. It is a very safe technology and can be used without causing any harm to the environment and the dyers.
Originality/value
This study is unique as it focuses on the use of RE salts in natural dyeing replacing the conventional mordants, which are used ten times more in quantity.
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Sandra Bergamini Leonardo, Marco Antonio Pinheiro Silveira, Paloma María Teresa Martinez-Sánchez and Maria do Carmo Romeiro
This paper aimed to analyze the contribution of the interorganizational relationship (IOR) factors trust and knowledge resources to the relational and transactional performance of…
Abstract
Purpose
This paper aimed to analyze the contribution of the interorganizational relationship (IOR) factors trust and knowledge resources to the relational and transactional performance of a Brazilian agricultural cluster formed by small farmers.
Design/methodology/approach
A survey was conducted using a questionnaire divided into groups of variables, each group seeking to identify one of the three constructs: trust, knowledge resources and relational and transactional performance. A theoretical framework was elaborated and later compared with survey results, which were analyzed using exploratory factor analysis (EFA) and partial least squares–structural equation modeling (PLS-SEM).
Findings
Correlations between trust and relational and transactional cluster performance varied according to actors involved, being significant between some actors and not significant between others. Knowledge resources, on the other hand, proved to be significantly relevant for cluster performance, considering both relational and transactional measures.
Research limitations/implications
It was made in a Brazilian single cluster and its conclusions cannot be generalized.
Practical implications
Farmers cannot innovate with the efficiency and effectiveness that the process demands. They need complementary capacity that apparently is not in the agricultural cluster. Research and development involve knowledge and techniques that empirical knowledge alone may not provide. And much of the formal knowledge is embedded in universities and research institutes. If there were investments by public entities in research and development to improve the culture and its by-products, this could contribute to improving the income of farmers.
Social implications
This study provided a photograph of the current scenario of a Brazilian agricultural cluster. Changes in trust and knowledge resources could affect cluster relational and transactional performance. Special attention is deserved to the important role of scientific research on agricultural clusters to strengthen the capacity of critical analysis by the researcher who, with the results in hand, makes them public, hoping that the shared information can contribute with the research of other scholars and improve the quality of life of farmers involved.
Originality/value
This study offers empirical evidence that trust and knowledge resources can contribute to a Brazilian agricultural cluster performance, which can be analyzed considering both relational and transactional measures. These findings brought new fact to Singh and Shrivastava’s (2013) research.
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Most countries seek to impose control on the chemical treatment of both human and animal food. Some, such as the U.S.A., attempt it by highly detailed regulations, in terms most…
Abstract
Most countries seek to impose control on the chemical treatment of both human and animal food. Some, such as the U.S.A., attempt it by highly detailed regulations, in terms most orthodox and almost psychically specific, which seem most complicated compared with our own simplified food ordinances; other countries, such as many of the newer states, treading cautiously in their virgin fields of law‐making, pass broad, enabling laws, leaving details to be filled in later. Although the object is the same in all countries, it is nothing short of amazing how the pattern of legislation manages to be so divergent, and applied for reasons that are not always apparent. In published regulations and laws, there would seem to be less intent on making a country's food exports conform to the legislative requirements of importing countries than in prescribing standards for its home products; the end results have produced food law chaos, rarely seen in other branches of law. A notable exception, the only one, to these irregular developments, and with particular reference to food additive control, are the common decrees and directives of the European Economic Community, representing the six Common Market countries. Its Council prescribes quality standards for individual foods, specific purity standards for preservatives and other additives which may be used for human consumption, and although this standardisation is only beginning, it deserves study, especially the manner in which the community regulations are enforced.
K. Chandrasekaran and M. Senthil Kumar
The purpose of this paper is to explore the synergic effect of wild turmeric (Curcuma Aromatica Salisb.) and holy basil (Ocimum Tenuiflorum L.) combination herbal extracts…
Abstract
Purpose
The purpose of this paper is to explore the synergic effect of wild turmeric (Curcuma Aromatica Salisb.) and holy basil (Ocimum Tenuiflorum L.) combination herbal extracts treatment on the moisture management properties of cotton, lyocell and micro-denier single jersey knitted fabrics and the factors affecting it, which is intended for the development of healthcare apparel products.
Design/methodology/approach
The pre-treated single jersey knitted fabrics of cotton, lyocell and micro-denier polyester fabrics were given finishing treatment with the wild turmeric (Curcuma Aromatica Salisb.) and holy basil (Ocimum Tenuiflorum L.) combination herbal extract proportions of 100%:0%, 75%:25%,50%:50%; 25%:75% and 0%:100%. The D-optimal factorial design developed using Design Expert software was used for the study. The finishing treatments were carried out using the pad−dry−cure method. The aim of the work is to find out the influence of combination herbal extract proportion, textile material and their interaction effect on the moisture management properties.
Findings
The ANOVA results revealed that the overall moisture management properties of single jersey knitted fabrics are influenced by the material type, combination herbal extract proportion and the interaction between material type and the combination herbal extracts proportion. The overall moisture management properties of combination herbal extracts treated cotton single jersey fabrics are found to be better than that of lyocell and micro-denier polyester fabrics due to their excellent accumulative one-way transport capability after the finishing treatment. Among the combination herbal extract proportions, 50:50 per cent combination herbal extract proportion was found to be better than other proportions.
Originality/value
The study on the moisture management properties of combination herbal extracts of wild turmeric (Curcuma Aromatica Salisb.) and holy basil (Ocimum Tenuiflorum L.) is a novel attempt to explore the synergic effect of active constituents in both the herbs.
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Organic cotton, which is produced without any chemical fertilizers and pesticides, is playing a vital role in creating a less harmful environment. An investigation of the…
Abstract
Organic cotton, which is produced without any chemical fertilizers and pesticides, is playing a vital role in creating a less harmful environment. An investigation of the properties of weft knitted fabrics produced from organically made cotton vis-à-vis regular cotton knitted fabric is reported. The yarn is made with both organically produced and regular cotton, and the fabric is knitted by using single jersey machines. The fabrics are subsequently dyed by using natural dyes. The naturally dyed knitted fabrics are examined for shrinkage, bursting strength, abrasion resistance, and colour fastness properties. The result shows that the knitted fabrics produced from organically grown cotton is superior in performance in comparison with fabrics produced from regular cotton.
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Scolastica Manyim, Ambrose Kipchumba Kiprop, Josphat Igadwa Mwasiagi, Cleophas Mecha Achisa and Mark Peter Odero
The majority of the synthetic dyes have been found to be non-biodegradable, toxic and carcinogenic. As a result, there has been a growing trend toward the use of natural dyes as…
Abstract
Purpose
The majority of the synthetic dyes have been found to be non-biodegradable, toxic and carcinogenic. As a result, there has been a growing trend toward the use of natural dyes as alternates to synthetic dyes. This shift calls for more research to come up with more sources of natural dyes to satisfy their increasing demand. Euclea divinorum plant has been used traditionally as a source of dye, however, its textile dyeing properties have not been studied. This study aims to determine the textile dyeing properties of E. divinorum extract.
Design/methodology/approach
Optimization of dyeing conditions of Euclea divinorum natural dye extract on the cotton fabric was done using response surface methodology (RSM). The combined effects of examined dyeing conditions on the relative color strength (K/S) were studied using a central composite experimental design. Analysis of variance (ANOVA) was used to determine the significance of the statistical model generated for the study. Mordanting effects were measured using standard ISO wash, rub and lightfastness tests.
Findings
The optimum dyeing conditions were found to be 68 min, pH 3.3 and 82°C with color strength 0.609. Temperature and pH showed some interaction effects during the dyeing experiments. The predicted optimum K/S value was validated experimentally using the optimum conditions and was found to be in agreement with the experimental values. All the metallic mordants used enhanced the color strength and provided a variety of brown shades, therefore, a suitable alternative for the toxic synthetic dyes.
Originality/value
Optimization of dyeing conditions of Euclea divinorum dye on cotton using RSM and mordanting at optimal conditions has not been done elsewhere.
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Van Helmont considered he had found it in water, and thus records his famous Brussels experiment: