Anderson D M, Howlett J F, McNab C G
Food Addit Contam. 1985 Oct-Dec;2(4):225-30. doi: 10.1080/02652038509373549.
Guar gum, powdered endosperm from the seeds of the legume Cyamopsis tetragonolobus, is a galactomannan which contains 2.5-4.5% of a proteinaceous component. Data presented for 11 bulk commercial samples show that the most abundant amino acids are glycine, glutamic acid, aspartic acid, serine and alanine, but that their relative proportions vary considerably. The proportions of other amino acids, e.g. histidine, isoleucine, phenylalanine, threonine, tyrosine and valine are remarkably constant. There appear to be some correlations between viscosity and the glycine, arginine and proline contents. Data for the amino acid compositions of several chemical derivatives of a medium-viscosity gum guar sample indicate that the proteinaceous component is retained but suffers variable modification. The amino acid profile for guar gum differs extensively from those for gum arabic and gum karaya; this provides a useful analytical supplement to sugar determinations for studies of admixtures of these hydrocolloids.
瓜尔豆胶是从豆科植物瓜尔豆种子的胚乳中提取的粉末状物质，是一种半乳甘露聚糖，含有2.5 - 4.5%的蛋白质成分。针对11个批量商业样品的数据表明，含量最丰富的氨基酸是甘氨酸、谷氨酸、天冬氨酸、丝氨酸和丙氨酸，但它们的相对比例差异很大。其他氨基酸，如组氨酸、异亮氨酸、苯丙氨酸、苏氨酸、酪氨酸和缬氨酸的比例则相当恒定。粘度与甘氨酸、精氨酸和脯氨酸含量之间似乎存在一些相关性。一种中粘度瓜尔豆胶样品的几种化学衍生物的氨基酸组成数据表明，蛋白质成分得以保留，但发生了不同程度的修饰。瓜尔豆胶的氨基酸谱与阿拉伯胶和刺梧桐树胶的氨基酸谱有很大差异；这为这些水胶体混合物研究中的糖分测定提供了有用的分析补充。
