Original scientific paper

The tinctorial stability of carthamin on polysaccharides and related substances

Koshi Saito ; Saito Phyto- Science Institute, Biochemical Laboratory, Phyto-Dye Division, Sapporo, Japan

Abstract

Various saccharides and related substances were mixed with carthamin in aqueous solutions and their effects on red colour stability compared. At a low temperature range (5 °C), mono- and disaccharides contributed to preservation of the carthamin red colouration. No mono- and disaccharides could relieve carthamin from being bleached at a high temperature (30 °C). Among polysaccharides and their derivates (tested at 30 °C for 24 h in the dark), Avicel cellulose was most effective for the retention of the red colour of carthamin (52 %). Chitin was also promising (41 %). CM-Cellulose, Sephadex G-15 and starch followed this (25, 17 and 13 %, respectively). The effects of alginic acid, chitosan, hyaluronic acid, agar and xylan were still further reduced (11, 8, 8, 7, and 5 % respectively). The adsorption of carthamin towards filter papers was investigated as a function of temperature, pH, buffer concentration and buffer types. To adsorb the red dye effectively, low temperature and high pH were found to be preferable. Buffer types were also contributive. Carthamin adsorption in citrate buffer at pH 4.5 with four different molar concentrations was not significant (24.7 -20.9 %), if compared with data without any buffer added (20.8 %). FT IR spectrometric analyses of carthamin adsorbed cellulose indicated that hydrogen bonding was involved in the carthamin/cellulose interaction. Based on the data, a hypothetical scheme to characterize a stable binding formation between carthamin and cellulose called the SAITO EFFECT was proposed.

Keywords

carthamin; dye; polysaccharide; cellulose; monosaccharides; stabilizers; colouration; textile; food

Hrčak ID:

160534

URI

https://hrcak.srce.hr/160534

Publication date:

31.12.1998.

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