研究冷冻干燥、喷雾干燥、真空干燥、热风干燥对甲壳低聚糖品质的影响。以不同的干燥方式制备甲壳低聚糖粉,测定产品的物性、还原糖、总糖及游离氨基含量和抗氧化活性等质量指标。冷冻干燥产品的还原糖、总糖、游离氨基的含量以及清除OH.的能力最高,产品的色泽和溶解性较好;喷雾干燥产品各项指标均较接近冷冻干燥;真空干燥产品除了清除O2-.能力外,其他指标不及冷冻干燥和喷雾干燥,但优于热风干燥;热风干燥产品色泽较深,还原糖、总糖、游离氨基含量以及清除OH.的能力、溶解性都不及其他3种干燥方式。相对于其他3种干燥方式,喷雾干燥较适合甲壳低聚糖的工业化生产。
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The target of this manuscript was to investigate the effect of vacuum freeze drying,spray drying,vacuum drying and hot air drying on the quality of chitooligosaccharides.For this,Chitooligosaccharides powder was made by different drying methods.Physical properties,contents of reducing sugar,total sugar and free amino groups,antioxidative activity were determined.It was found that vacuum freeze-dried product possessed the highest contents of reducing sugar,total sugar and free amino groups,and exhibited the best hydroxyl free radical scavenging capacity,color,and solubility.The quality of spray-dried product was almost the same as that of vacuum freeze-dried product.The tested indices of vacuum dried product were better than that of hot air dried but less than vacuum freeze dried and spray dried product except its superoxide anion radical scavenging activity.Hot air drying produced the poorest chitooligosaccharides powder which possessed dark color,poor solubility,low content of free amino groups,reducing and total sugar.Among of them,spray drying is more suitable for the actual industrial production.
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