洋葱总糖水分测定方法探讨

Discussion on Determination Method of the Total Sugar Moisture in Onion

目的探讨洋葱总糖的水分测定方法。方法分别用直接干燥法、减压干燥法、甲苯蒸馏法、海砂拌样减压干燥法测定洋葱总糖的水分，从中选择合适的测定方法。结果直接干燥法、减压干燥法测定耗时长。甲苯蒸馏法测定时，样品易高温下脱水碳化。而采用海砂拌样减压干燥法适合洋葱总糖的水分检测。结论采用海砂拌样减压干燥法简便、易行、实用，适用洋葱总糖样品的分析。

Objective： to discuss a total sugar moisture detecting method in onion, method：The direct drying method, vacuum drying method, distillation method with toluene, drying method and sea - sand dealing with samples are used to measure the moisture content of the onion total sugar separately, then the right method was chosen from these methods for determination, results： direct drying method and vacuum drying method consumes long time. The sample was carbonized easily and lost the moisture content at the high temperature during the measurement process by distillation method with toluene . the drying method which uses sea sand to deal with samples could successfully determines in vacuum, conclusion： the drying method which uses sea sand to deal with samples is simple and practicable, can be used for the moisture determination of the onion total sugar samples.