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Extraction of natural dyes from Alpinia blepharocalyx K. Schum. for dyeing of silk fabric
Author(s) -
Wang Chunxia,
Xu Changhai,
Tian Anli,
Fu Shaohai,
Wang Chaoxia
Publication year - 2013
Publication title -
coloration technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 1472-3581
DOI - 10.1111/j.1478-4408.2012.00407.x
Subject(s) - mordant , dyeing , extraction (chemistry) , silk , natural dye , chemistry , sodium hydroxide , potassium hydroxide , nuclear chemistry , potassium , pulp and paper industry , chromatography , materials science , organic chemistry , composite material , engineering
Natural dyes were extracted from the leaves and stems of Alpinia blepharocalyx K. Schum. Analysis of the designed experiment revealed that extraction at a plant/water ratio of 1:20 could reach an optimal production of natural dyes when extraction was performed at 80 °C, for 4 h, under 20 min ultrasound, in the presence of 10 g/l sodium hydroxide, and with two extractions. The extracted natural dyes were applied to the dyeing of silk fabrics using different methods, including or excluding a mordant. It was found that mordants had a significant effect on the colour of dyed silk fabrics. The silk fabric dyed with the pre‐mordant method using potassium aluminium sulphate as a mordant showed a bright yellow with a higher colour strength. The optimal dyeing conditions were reached when the extracted natural dyes were pre‐mordanted with 10 g/l potassium aluminium sulphate at pH 6, and for a 20 min dyeing time.