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Production of luteolin extracts from Reseda luteola and assessment of their dyeing properties
Author(s) -
Cerrato Alfonso,
De Santis Diana,
Moresi Mauro
Publication year - 2002
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.1160
Subject(s) - dyeing , wool , methanol , extraction (chemistry) , leaching (pedology) , raw material , solvent , boiling , pulp and paper industry , chemistry , luteolin , materials science , particle size , chromatography , composite material , organic chemistry , environmental science , soil water , flavonoid , soil science , engineering , antioxidant
In this work, several experiments were performed sequentially in 50 cm 3 shaken tubes and a 1 dm 3 stirred extractor, thus allowing methanol to be selected as the most appropriate leaching solvent for luteolin from leaves, stems and flowers of weld ( Reseda luteola ). The extraction capability of methanol at 25 °C was found to be about 7 times greater than that of boiling water at pH 10. A composite design experiment allowed the effects of particle size and liquid/solid ratio to be determined, thus resulting in an optimal luteolin extraction yield of 8.6 ± 0.2 g kg −1 dried weld material when leaching plant particles sieved through 0.5 mm openings with 40 dm 3 methanol kg −1 . Preliminary dyeing tests on pre‐mordanted raw cotton and wool standard specimens gave rise to dyed specimens with the same greenish‐yellow hue but greater or smaller values of lightness and chroma respectively. Despite all dyed specimens exhibiting a minimum resistance to a simulated acid perspiration solution, the resistance to fading of dyed wool specimens was generally greater than that of cotton ones. © 2002 Society of Chemical Industry