为研究桑枝氨基酸含量情况,采用酸水解、异硫氰酸苯酯柱前衍生、超高效液相色谱仪法对采自重庆不同区县的9个采样点、3个品种共18批次桑枝中的17种氨基酸含量进行测定。结果表明,17种氨基酸在各自质量浓度范围内,峰面积和浓度呈现良好的线性关系,相关系数r为0.997 9~0.999 9。18批次桑枝样品中均检出17种氨基酸,桑枝中氨基酸总量为41.09~111.70 mg/g,平均含量为64.48 mg/g;必需氨基酸的总含量为16.88~35.45 mg/g,平均含量为23.53 mg/g;药用氨基酸总量为22.98~59.99 mg/g,平均含量为35.58 mg/g。不同品种桑枝在氨基酸种类上基本无差异,但含量差异较大,其中含量最高的脯氨酸和谷氨酸平均含量为10.49 mg/g和6.37 mg/g,分别占氨基酸总量的16.27%和9.88%。结果表明桑枝中氨基酸种类丰富,含量较高。该研究可为深入研究桑枝的药用价值提供基础资料。
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