生物活性低聚半乳糖牛乳的理化及感官特性分析

Physiochemical indexes and sensory characteristics of bioactive galactooligosaccharides rich bovine milk

对生物活性低聚半乳糖牛乳进行了理化以及感官特性分析。采用高效阴离子交换色谱-脉冲安培检测器对活性乳中的低聚半乳糖进行定性、定量分析。结果表明,活性乳中生成低聚半乳糖质量分数为0.881g/100g,转化率为17.0%。经过乳成分检测,活性乳中含乳脂肪0.10%,蛋白质3.26%,非脂乳固体8.68%,乳糖4.42%(均为质量分数),质量分数皆符合灭菌乳国家标准。经色差仪检测,该活性乳与原料牛乳的明度、红绿色差有显著性差异(P<0.05),在黄蓝颜色及总色差上有极显著差异(P<0.01)。活性乳呈微黄色、外观均一,感官评定结果显示,活性乳有较强的奶香味,甜度较高,与原料乳的滋味、气味及组织状态没有显著性差异,而色泽及甜度则差异极显著(P<0.01)。

The analysis of physicochemical indexes and sensory properties of the invented bioactive galacto-oligosaccharide（GOS） rich bovin milk were studied.High performance anion exchange chromatography with pulsed amperometric detection was used for qualitative and quantitative analysis of the GOS milk.The results showed in this product,the concentration of GOS reached 0.881g/100g,and the GOS conversion rate attained 17.0%.The fat in the GOS milk was 0.10%,the protein was 3.26%,the non-fat milk solids was 8.68%,and the lactose was 4.42%.All the amounts of ingredients are in compliance with national standards of sterilized milk product.The color of GOS milk is light yellow with homogeneous appearance.Its brightness and red-green chromatic aberration were significant different from the raw milk（P0.05）,and the total color and yellow-blue chromatic aberration were extremely significant different from the raw milk（P0.01）.From the sensory evaluation results,there was no significant difference between the GOS milk and the raw milk in taste,smelling and texture,while the color and sweetness were significantly different（P0.01）.