One-step enzymatic synthesis of blue pigments from geniposide for fabric dyeing |
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Authors: | Y J Cho S Y Kim J Kim E K Choe S I Kim H J Shin |
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Institution: | (1) BRD School of Biosciences, Sardar Patel Maidan, Sardar Patel University, Vadtal Road, Satellite Campus, P.O. Box No. 39, Vallabh Vidyanagar, 388120, Gujarat, India |
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Abstract: | In this study, we describe a one-step chemoenzymatic reaction for the production of natural blue pigments, in which the geniposide
from Gardenia extracts is transformed by glycosidases to genipin. Genipin is then allowed to react with amino acids, thereby
generating a natural blue pigment. The β-glycosidases, most notably isolase (a variant of β-glucanase), recombinant β-glucosidase,
Cellulase T, and amylases, were shown to hydrolyze geniposide to produce the desired pigments, whereas the α-glycosidases
did not. Among the 20 tested amino acids, glycine and tyrosine were associated with the highest dye production yields. The
optimal molar ratio of geniposide to glycine, two reactants relevant to pigment production, was unity. The natural blue pigments
produced in this study were used to dye cotton, silk, and wool. The color yields of the pigments were determined to be significantly
higher than those of other natural dyes. Furthermore, the color fastness properties of these dyes were fairly good, even in
the absence of mordant. |
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