为了探明喷雾干燥条件对荔枝酸奶粉乳酸菌存活率及粉体特性的影响规律,采用喷雾干燥法对荔枝酸奶进行微胶囊化。探讨料液固形物含量、进风温度、进料速度对荔枝酸奶粉的乳酸菌存活率、水分含量和得率的影响,在较优喷雾干燥条件下,进一...为了探明喷雾干燥条件对荔枝酸奶粉乳酸菌存活率及粉体特性的影响规律,采用喷雾干燥法对荔枝酸奶进行微胶囊化。探讨料液固形物含量、进风温度、进料速度对荔枝酸奶粉的乳酸菌存活率、水分含量和得率的影响,在较优喷雾干燥条件下,进一步探讨保护剂海藻糖对产品品质的影响。结果显示,当料液固形物含量25%~30%,进风温度140℃,进料速度6.5~10.0 m L/min时,荔枝酸奶粉的乳酸菌存活率、得率均高于50%,且水分含量较低(4.66%~4.79%)。在此条件下,添加6%(以酸奶质量计)的海藻糖可将乳酸菌存活率提高至73.94%(6.34×10~8CFU/g),水分含量为4.72%,得率37.79%;扫描电子显微镜(SEM)观察发现,与不添加海藻糖的相比,添加6%海藻糖的荔枝酸奶粉颗粒表面圆润且裂纹较小;差示扫描量热法(DSC)测得粉体的玻璃化转变温度Tg为71.61℃。展开更多
This paper focused on the effect of spraying chitosan and salicylic acid to Litchi under low temperature stress conditions.The physiology and biochemistry of litchi were studied as well.Results showed that the appropr...This paper focused on the effect of spraying chitosan and salicylic acid to Litchi under low temperature stress conditions.The physiology and biochemistry of litchi were studied as well.Results showed that the appropriate concentration of chitosan and salicylic acid treatment could effectively reduce injury caused by low temperature to litchi,compared with water control,chlorophyll,proline,soluble protein content of litchi after treatment and the activity of protective enzyme increasing significantly.However,the accumulation of resistance could significantly be improved.Furthermore,when 1 000 mg/L chitosan combined with 50 mg/L salicylic acid,the litchi acquired the best cold resistance capability.展开更多
文摘为了探明喷雾干燥条件对荔枝酸奶粉乳酸菌存活率及粉体特性的影响规律,采用喷雾干燥法对荔枝酸奶进行微胶囊化。探讨料液固形物含量、进风温度、进料速度对荔枝酸奶粉的乳酸菌存活率、水分含量和得率的影响,在较优喷雾干燥条件下,进一步探讨保护剂海藻糖对产品品质的影响。结果显示,当料液固形物含量25%~30%,进风温度140℃,进料速度6.5~10.0 m L/min时,荔枝酸奶粉的乳酸菌存活率、得率均高于50%,且水分含量较低(4.66%~4.79%)。在此条件下,添加6%(以酸奶质量计)的海藻糖可将乳酸菌存活率提高至73.94%(6.34×10~8CFU/g),水分含量为4.72%,得率37.79%;扫描电子显微镜(SEM)观察发现,与不添加海藻糖的相比,添加6%海藻糖的荔枝酸奶粉颗粒表面圆润且裂纹较小;差示扫描量热法(DSC)测得粉体的玻璃化转变温度Tg为71.61℃。
文摘This paper focused on the effect of spraying chitosan and salicylic acid to Litchi under low temperature stress conditions.The physiology and biochemistry of litchi were studied as well.Results showed that the appropriate concentration of chitosan and salicylic acid treatment could effectively reduce injury caused by low temperature to litchi,compared with water control,chlorophyll,proline,soluble protein content of litchi after treatment and the activity of protective enzyme increasing significantly.However,the accumulation of resistance could significantly be improved.Furthermore,when 1 000 mg/L chitosan combined with 50 mg/L salicylic acid,the litchi acquired the best cold resistance capability.