Premium
Application of deaerated water in extraction of colorants from dyer's saffron florets
Author(s) -
Ogawa Ikuko,
Yamano Hideki,
Miyagawa Kinjiro
Publication year - 1999
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19991114)74:7<1701::aid-app13>3.0.co;2-b
Subject(s) - extraction (chemistry) , absorbance , water extraction , carthamus , dyeing , chemistry , nuclear chemistry , chromatography , organic chemistry , traditional medicine , medicine
The efficiency of the application of deaerated water that has no dissolved gases in extraction of colorants from dyer's saffron ( Carthamus tinctorius L.) was examined. Dyer's saffron contains about 7% yellow colorants, saffrole yellow, and 0.3% red colorants, carthamine. Saffrole yellow must be removed completely from dyer's saffron before the carthamine extraction, because if saffrole yellow is present in carthamine‐red dyeing, the resulting color is yellowish. Carthamine is one of the colorants that decomposes with heat. The application of deaerated water in the extraction of these two colorants was examined. With the extraction of saffrole yellow, the maximum absorbances of extract solutions are the same as those in air‐present water. The rate constants in deaerated water are lower than those in air‐present water. With the extraction of carthamine, the ratios of the maximum value of cumulative absorbance in deaerated water to those in air‐present water are 124 ± 7% at 0°C and 118 ± 10% at 25°C. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 1701–1704, 1999