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Article
Publication date: 8 February 2021

Siddhesh Umesh Mestry, Umesh Ratan Mahajan, Aswathy M. and Shashank T. Mhaske

The purpose of this paper is to use the bio-based resource as the starting material for the synthesis of azo dye. Cardanol is one of the most used bio-based resources for carrying…

Abstract

Purpose

The purpose of this paper is to use the bio-based resource as the starting material for the synthesis of azo dye. Cardanol is one of the most used bio-based resources for carrying out the synthesis of various compounds having numerous end applications. The study presents an attempt to develop an azo dye from Cardanol having end applications in pH-responsive dyes.

Design/methodology/approach

The cardanol was sulfonated to block the para position by which ortho positioned hydroxyl group after diazotization and coupling will provide necessary pH-sensitivity. The diazotization of two naphthalene derivatives, i.e. 1-naphthol-8-amino-3,6-disulfonic acid (H-acid) and 7-amino-4-hydroxy-2-naphthalene sulfonic acid (J-acid) was carried out using the standard practice, and the diazotized compounds were coupled with the sulfonated cardanol. The obtained dyes were characterized by Fourier transform infrared, nuclear magnetic resonance, carbon-hydrogen-nitrogen-sulfur analysis and hydroxyl value. The colour properties were checked using UV-vis spectrophotometry and density functional theory, while thermogravimetric analysis was used for the thermal degradation studies of both the dyes.

Findings

Water-soluble cardanol-based azo dyes were prepared successfully having good thermal stability, and the obtained results are being presented in this paper.

Originality/value

The originality lies between the use of cardanol as a bio-based resource for the synthesis of azo-dye and the obtained azo-dye has the pH-sensitivity.

Details

Pigment & Resin Technology, vol. 50 no. 3
Type: Research Article
ISSN: 0369-9420

Keywords

Article
Publication date: 2 May 2017

Hatem E. Gaffer, Mohamed R. Elgohary, Hassan Ali Etman and Saad Shaaban

The purpose of this paper was to synthesize novel antibacterial reactive dyes for dyeing cotton fabrics.

Abstract

Purpose

The purpose of this paper was to synthesize novel antibacterial reactive dyes for dyeing cotton fabrics.

Design/methodology/approach

Four synthetic novel antibacterial reactive dyes based on sulfonamide (D1-D4) have been synthesized by the coupling reaction of sulfonamide diazonium salt with sulfonamido-cyanurated 7-amino-4-hydroxynaphthalene-2-sulfonic acid “j-acid”. The chemical structure of the synthesized dyes was secured by their spectral data [infra red (IR) and proton Nuclear magnetic Resonance (1HNMR)].

Findings

The prepared reactive dyes (D1-D4) were applied to cotton fabrics. Optimum conditions of the dying samples at sodium sulfate 100 g/l, liquor ratio (L.R.) 1:10, sodium carbonate 20 g/l at 80°C (D1, D2 and D4), 60°C (D3 for 60 min) were investigated. The fastness properties toward washing, perspiration, rubbing and light were evaluated. Dyed fabrics showed good light fastness property and good to very good washing and perspiration fastness properties according to the gray scale. Antimicrobial activities for synthesized dyes showed excellent activity against gram-negative organisms such as Pseudomonas aeruginosa and Proteus mirabilis faecalis, whereas very good activity against gram-positive organisms such as Staphylococcus aureus and Enterococcus faecalis with respect to the standard drugs ampicillin and chloramphenicol.

Originality/value

The principle advantages in this study were that the synthesis of novel synthesized dyes by introducing bisulfonamide-based moieties to increase the antimicrobial activity of the cellulose fabrics could be used as a medical textile, short reaction time and reaction procedure conducted in few steps, the work up is convenient and thus the starting material can be easily prepared.

Details

Pigment & Resin Technology, vol. 46 no. 3
Type: Research Article
ISSN: 0369-9420

Keywords

Article
Publication date: 1 April 1927

The Departmental Committee appointed in June, 1924, to inquire into the question as to whether and to what extent the practice of treating flour with chemical substances is…

Abstract

The Departmental Committee appointed in June, 1924, to inquire into the question as to whether and to what extent the practice of treating flour with chemical substances is objectionable on grounds of health and whether it is desirable that the practice should be prohibited or restricted, have issued their report. The Committee observe :—

Details

British Food Journal, vol. 29 no. 4
Type: Research Article
ISSN: 0007-070X

Article
Publication date: 1 August 2001

Galal H. Elgemeie, Maher H. Helal and Heba M. El‐Sayed

The synthesis and chemistry of nitrogen heterocyclic azo compounds have been extensively studied. Many derivatives of this type were proved to be excellent dyes. Presents a…

1174

Abstract

The synthesis and chemistry of nitrogen heterocyclic azo compounds have been extensively studied. Many derivatives of this type were proved to be excellent dyes. Presents a systematic and comprehensive survey of all recently synthesised nitrogen heterocyclic azo dyes according to dyeing methods.

Details

Pigment & Resin Technology, vol. 30 no. 4
Type: Research Article
ISSN: 0369-9420

Keywords

Article
Publication date: 1 August 1977

Jennifer Brice, Nick Childs, Roger M Shrigley, George Berriman, Janina S Morris and Alan Day

ANY GOOD DICTIONARY will define its terms, and this is a good precedent to follow. What is meant by ‘the affability factor’ comprises many elements which act together to create a…

Abstract

ANY GOOD DICTIONARY will define its terms, and this is a good precedent to follow. What is meant by ‘the affability factor’ comprises many elements which act together to create a favourable environment for a) first use of the library, and b) for the encouragement of repeat visits.

Details

New Library World, vol. 78 no. 8
Type: Research Article
ISSN: 0307-4803

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