一有效三氧化二硼的测定试剂转化糖溶液:蔗糖500g 加水325ml,于水浴上加热搅拌使其溶解。加热至85℃,加入0.1N 盐酸溶液40ml,于此温度保温1小时。然后加入0.1N 氢氧化钠溶液40ml。若颜色太深,可加入适量的活性碳脱色,过滤后稀释至750ml。操作方法称取试样1g,加水100ml,煮沸5分钟。趁热过滤,用热水洗涤。滤液中加入2～3滴甲基橙指示剂,滴加稀盐酸至红色,煮沸1～2分钟,迅速冷却至室温。用盐酸和氢氧化钠调至溶液刚变黄色,加入10～15滴酚酞指示剂,10ml 转化糖,以0.1N 标准氢 An effective measurement of boron trioxide reagent Transformed sugar solution: sucrose 500g add water 325ml, heated in a water bath to dissolve. Heated to 85 ℃, 0.1N hydrochloric acid solution was added 40ml, incubated at this temperature for 1 hour. Then 40 ml 0.1N sodium hydroxide solution was added. If the color is too dark, add an appropriate amount of activated carbon bleaching, diluted to 750ml after filtration. Method of operation Weigh the sample 1g, add water 100ml, boil 5 minutes. Filter while still hot and wash with hot water. The filtrate was added 2 to 3 drops of methyl orange indicator, dropping dilute hydrochloric acid to red, boil 1 to 2 minutes, rapidly cooled to room temperature. With hydrochloric acid and sodium hydroxide solution just changed yellow, add 10 to 15 drops of phenolphthalein indicator, 10ml of invert sugar, 0.1N standard hydrogen