San-ei Gen F.f.i., Inc.

Kazuhiro Emura

Masamitsu Moriwaki

Takatoshi Koda

Yutaka Higashimura

Hisashi Tanaka

Noriko Kuze

Junko Shirai

The present invention provides a method for producing isoquercitrin, &#x3b1;-glycosylisoquercitrin, and rhamnose, the method comprising a step of naringin-degrading enzyme treatment during the isoquercitrin production from rutin in the presence of an edible component, such as gelatin, wheat gluten, chitosan, lecithin, a glycerol fatty acid ester, xanthan gum, carrageenan, sodium chondroitin sulfate, casein, enzymatically decomposed gelatin, sodium alginate, konjac extract, gellan gum, guar gum, soybean protein, agar, pectin, yeast extract, egg-white peptide, cluster dextrin, gum arabic, arginine, sodium metaphosphate, karaya gum, locust bean gum, sodium pyrophosphate, glucosamine, chitin, sodium glutamate, dextrin, trehalose, or a grain-based food ingredients. According to the present invention, isoquercitrin and &#x3b1;-glycosylisoquercitrin, which are of use as antioxidants, anti-fading agents, flavor change inhibitors, etc., can be produced in enhanced yields.

Method for manufacturing &#x3b1;-glycosylisoquercitrin, intermediate product and by-product thereof

The present invention provide an anti-fading agent for a pigment, characterized by comprising as active ingredients at least one oligosaccharide selected from the group consisting of nigerooligosaccharide, maltooligosaccharide and panose, when so required, in addition of an antioxidant. The anti-fading agent of the invention can advantageously inhibit fading in colors (including fading in colors by light irradiation and heat treatment) of natural pigments such as anthocyanin-based pigments, flavonoid-based pigments, carotenoid-based pigments and the like, and is useful for colored beverage and food products, pharmaceutical drugs, cosmetics and the like with which the fading in colors may be a problem.

Method for inhibiting fading of a natural pigment using nigerooligosaccharide or maltooligosaccharide or panose with or without an antioxidant

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Toyonaka, Japan

Kazuhiro Emura