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Publication date: 22 May 2009

Padma S. Vankar, Rakhi Shanker, Shalini Dixit, Debajit Mahanta and S.C. Tiwari

The purpose of this paper is to evaluate the efficiency of ultrasonication on new natural dye obtained from leaves and stem extracts of Daphne papyraceae using metal mordant for…

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Abstract

Purpose

The purpose of this paper is to evaluate the efficiency of ultrasonication on new natural dye obtained from leaves and stem extracts of Daphne papyraceae using metal mordant for good cotton, silk and wool dyeing prospects. It also proposes to effect the characterisation of the colorant.

Design/methodology/approach

For effective natural dyeing with leaves and stem extracts of D. papyraceae, both conventional and sonication methods for cotton, silk and wool dyeing were carried out using metal mordants. The purpose of using sonication was for betterment of dye uptake, improved dye adherence and good wash and light fastnesses. Results show marked improvement by the chosen dyeing method. Simultaneously, chemical characterisation of the colorant was carried out by first column chromatographic separation of the crude extract, followed by spectral analysis of the isolated products.

Findings

The superiority of sonicator dyeing over conventional dyeing in terms of enhanced resource productivity and, as a result, reduced wastes makes it the established best available technique in the natural dyeing industry. This fact has been examined for several natural dyes. Use of sonicator shows marked enhancement for cotton‐, silk‐ and wool‐dyed fabrics. Typical bath liquor to fabric ratio for conventional dyeing varies from 20:1 to 15:1 and for sonicator dyeing from only 12:1 to 10:1, thereby reducing specific water and energy consumption by 30 and 50 per cent, respectively. The cycle time for dyeing was also reduced by 50 per cent and this would benefit the dyeing process with more tonnage of fabric per unit time and with lower waste generation. This would also result in improved capacity utilization leading to enhanced productivity levels in the dyeing houses.

Research limitations/implications

Although metal mordanting with copper sulphate and potassium dichromate is not ecofriendly, only 2 per cent of these metal salts has been used to prepare different shades with leaves and stem extracts of D. papyraceae for cotton, silk and wool fabrics.

Practical implications

The method developed for natural dyeing of cotton, silk and wool fabrics using sonication in conjunction with metal mordanting has shown marked improvement. The chemical composition of the crude extract shows the presence of flavonoids and other specific natural pigments.

Originality/value

The method developed for natural dyeing of cotton, silk and wool fabrics using stem and leaves extracts of D. papyraceae under sonication in conjunction with metal mordanting has shown marked improvement in terms of dye adherence and fastness properties and can thus be recommended for industrial application. This is a new source of natural dye.

Details

Pigment & Resin Technology, vol. 38 no. 3
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 10 November 2014

Debajit Sarma, M. S. Akhtar, Partha Das, Puspita Das, Ganesh Gadiya, Neetu Shahi and A. Ciji

The present study aims to determine the proximate and mineral composition of important coldwater food fishes in the North Eastern Indian upland region to assess their nutritional…

182

Abstract

Purpose

The present study aims to determine the proximate and mineral composition of important coldwater food fishes in the North Eastern Indian upland region to assess their nutritional quality.

Design/methodology/approach

The paper is of original work and the analyses were performed using AOAC (1990). Data were analyzed by one-way analysis of variance (ANOVA) and determined by Duncan’s Multiple Range Test using SPSS (Version 19).

Findings

Crude protein levels ranged from 16-20 per cent, crude fat (CF) 9.60-1.54 per cent and ash 3.5-0.99 per cent. Moisture content was in the range of 71-78 per cent. The lowest moisture content was observed in Semiplotus semiplotus and highest in Labeo dero. Sodium, potassium and calcium content ranged from 92-309, 692-1435, 467-2021 mg/100g, respectively. Maximum concentration of potassium was found in Labeo dero followed by Labeo pangusia. Selenium was most abundant in L. dero, Labeo dyocheilus, Sanguina sanguine, Barilius bendelisis, Garra mullya, L. pangusia and Neolissochilus hexagonolepis. The maximum level of iron was evidenced in Tor tor.

Originality/value

The results obtained revealed that all the ten studied fishes are rich sources of nutrients including protein, macro and micro-minerals, which will be a healthy addition to human diet and will act as a ready reference for the nutritionists and other stakeholders.

Details

Nutrition & Food Science, vol. 44 no. 6
Type: Research Article
ISSN: 0034-6659

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