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Relationship between the physico-chemical Property of Xanthan and its Antioxidative Activity in Emulsion.

乳液中黄原胶的理化性质与其抗氧化活性的关系。

基本信息

批准号：
07680038
负责人：
SHIMADA Kazuko
金额：
$ 1.47万
依托单位：
Yamaguchi Prefectural University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07680038/
关键词：
Xanthan Antioxidant Chelation Iron-binding property Dissolved oxygen Emulsion Viscosity Cellulase ピルビン酸

项目摘要

Xanthan have been considered as stabilizing an oil/water (O/W) emulsion by increasing the viscosity of the aqueous phase and inhibiting its coalescence. Xanthan chelated such as a metal ion as Fe^<2+> between two side chains with a pyruvate residue and thereby inhibited the oxidation of soybean oil in the emulsion. The effects of emulsion viscosity and oil-droplet size on the oxidation of soybean oil in O/W emulsions containing xanthan or other polysaccharides were investigated. The antioxidative effects were evaluated by measuring the Fe^<2+>-induced consumption of oxygen dissolved in the O/W emulsion. The degree of oxygen consumption was, from the lowest, in the order of xanthan<pectin<guar gum<Tragacanth gum, and was closely related to the Fe^<2+>-binding ability of the polysaccharides. The oxygen consumption was also affected by the viscosity of the aqueous solution in the emulsion, but not by the oil-droplet size.The viscosities of xanthan and deacetylated xanthan solutions were decreased by the treatment of cellulase (Trichoderma viride). The deacetylated and cellulase-treated xanthan was smaller in molecular size. Both low-molecular-weight xanthans retained the pyruvate residue, Fe^<2+>-binding and chelating abilities (dissociation constant and number of binding sites), and showed strong antioxidative activity.The antioxidative mechanism for xanthan can be accounted for primarily by its high metal-binding ability, and additionally by its viscous behavior.

黄原胶被认为是通过增加水相粘度和抑制其聚结来稳定油/水（O/W）乳液的。黄原胶在两个侧链之间与丙酮酸残基螯合了Fe^<2+>等金属离子，从而抑制了乳化液中大豆油的氧化。研究了乳状液粘度和油滴大小对含黄原胶或其他多糖的油水乳状液中大豆油氧化的影响。通过测定油水乳状液中Fe^<2+>诱导的溶氧量来评价其抗氧化效果。耗氧量从低到低依次为黄原胶<果胶<瓜尔胶<黄芪胶，并与多糖的Fe^<2+>-结合能力密切相关。耗氧量也受乳液中水溶液粘度的影响，但不受油滴大小的影响。纤维素酶（木霉）的处理降低了黄原胶和脱乙酰黄原胶溶液的粘度。脱乙酰化和纤维素酶处理的黄原胶分子尺寸较小。两种低分子量黄原胶均保留了丙酮酸残基、Fe^<2+>-结合和螯合能力（解离常数和结合位点数），并表现出较强的抗氧化活性。黄原胶的抗氧化机制主要是由于它的高金属结合能力，以及它的粘性行为。