牡丹花纯露营养酸奶的研制及品质分析

Study on Peony Pure Dew Nutritional Yogurt and Quality Analysis

以牡丹花纯露添加量、发酵剂接种量、白砂糖添加量为单因素指标,牡丹花纯露酸奶的酸度、pH、持水力、质构特性及感官评分为考核指标,利用响应面分析法对牡丹花纯露酸奶发酵配方进行优化,并对产品的理化指标、微生物指标及抗氧化活性进行分析。结果表明,牡丹花纯露酸奶的最佳发酵配方为牡丹花纯露添加量4.0%,发酵剂接种量0.2%,白砂糖添加量7%,在此优化工艺条件下牡丹酸奶的感官评分为96分,与预测值(96.242分)相近;牡丹花纯露酸奶的硬度3.892 N,弹性0.9985 mm,胶黏性3.275 N,凝聚性0.851,粘度1.43 mJ,均优于未添加牡丹花纯露的酸奶;牡丹花纯露酸奶持水力为81.5%,pH4.23,蛋白质含量3.01 g/100 g,脂肪含量2.88 g/100 g,酸度78.85°T,乳酸菌数为1.5×10^(8) CFU/mL,大肠杆菌未检出,检测结果均符合食品安全国家标准;牡丹花纯露酸奶(浓度为25 mg/mL时)对DPPH和羟自由基的清除率分别为63.2%、59.5%,抗氧化能力显著优于原味酸奶。牡丹花纯露酸奶具有更好的品质和较强的抗氧化活性。

Taking the addition amount of peony dew,the inoculation amount of starter and the addition amount of granulated sugar as single factor indexes,and the acidity,pH,water holding capacity,texture characteristics and sensory score of peony dew yogurt as evaluation indexes.The fermentation formula of peony dew yogurt was optimized by response surface analysis,and the microbial index,physical and chemical index and antioxidant activity of the product were analyzed.The results showed that the optimum fermentation formula of Peony flower yogurt was peony flower dew 4.0%,starter inoculum 0.2%,granulated sugar 7%.Under the optimized process conditions,the sensory score of peony yogurt was 96,which was close to the predicted value(96.242 points).The hardness,elasticity,viscosity,cohesion and viscosity of peony dew yoghurt were 3.892 N,0.9985 mm,3.275 N,0.851 and 1.43 mJ,respectively,and the indexes were better than those of peony dew yoghurt.The water holding capacity of peony dew yoghurt was 81.5%,pH was 4.23,protein content was 3.01 g/100 g,fat content was 2.88 g/100 g,acidity was 78.85°T,and the number of lactic acid bacteria was 1.5×10^(8) CFU/mL,Escherichia coli was not detected,and the test results met the national food safety standards.The scavenging rates of DPPH and hydroxyl radical of peony dew yoghurt(When the mass concentration was 25 mg/mL) were 63.2% and 59.5%,respectively.The antioxidant capacity was significantly better than that of original yoghurt.Peony juice yogurt has better quality and strong antioxidant activity.