Methanol extract of Lycium barbarism L. was refluxed and the content of betaine was determined separately by spectrophotometry and HPLC with NH2 stationary phase without derivatization of betaine.

• 试验采用甲醇加热回流提取枸杞甜菜碱，分光光度法和NH2柱未经衍生高效液相色谱法分别测定甜菜碱含量。