为了能够准确测定麦芽、麦汁和啤酒中的戊聚糖,通过比较地衣酚-盐酸法和间苯三酚法在测定不同样品时的精密度和回收率得出:间苯三酚测定麦芽中戊聚糖较为准确,通过测定几种麦芽,发现不同品种的麦芽之间戊聚糖存在较大的差异;麦汁不能直接采用两种方法测定,经过酵母发酵处理之后的麦汁采用地衣酚-盐酸法测定时结果较为准确;地衣酚-盐酸法测定啤酒的戊聚糖较为准确,通过测定几种啤酒,发现不同啤酒中戊聚糖存在明显差异。

In order to determine pentosan in the malt,wort and beer accurately,orcinol-hydrochloric acid and phloroglucinol methods were used to compare accuracy and recovery.The results showed that Phloroglucdinol method could determine the content of pentosan in malt accurately and several varieties of malt identified are quite different from each other.Both methods do not directly measure wort,but when fermented by yeast,orcinol-hydrochloric acid method could determinate pentosan accurately.Orcinol-hydrochloric acid method can determine pentosan in beer accurately and big differences among several varieties of beer were also determined.