以制作干酪过程中产生的乳清为试材,采用截留分子量为10 k Da的再生纤维素对乳清浓缩至最佳倍数(7倍)后,以连续补水的方式洗脱乳糖。在单因素试验的基础上,采用响应面法建立料液比、流速和压力三个主要因素与乳糖脱除率之间的数学模型,...以制作干酪过程中产生的乳清为试材,采用截留分子量为10 k Da的再生纤维素对乳清浓缩至最佳倍数(7倍)后,以连续补水的方式洗脱乳糖。在单因素试验的基础上,采用响应面法建立料液比、流速和压力三个主要因素与乳糖脱除率之间的数学模型,对乳糖渗滤工艺进行优化。得到最佳工艺条件为:料液比2∶1(V/V),流速30 m/s,压力0.14 MPa。此条件下,乳糖脱除率达到87.282%。展开更多
The aim of this study was selection of appropriate Lactobacillus strains for production of functional whey-based beverage. Sixteen strains of different species of Lactobacillus genera were studied and their abilities ...The aim of this study was selection of appropriate Lactobacillus strains for production of functional whey-based beverage. Sixteen strains of different species of Lactobacillus genera were studied and their abilities to carry out fast production of the beverage with satisfactory fermentation parameters were assessed. Preliminary screening was performed by evaluating volumetric productivity of tested strains after 24 h of the fermentation. Further selection was based on determining beverage production parameters such as fermentation time, titratable acidity, cell number and sensory characteristics. The strains showed remarkable differences in cell number and sensory properties, which were particularly useful in the selection. Based on the obtained results, the strains Lb. casei ssp. casei ATCC 27139 and Lb. johnsonii NRRL B-2178 are good candidates for the beverage production. These strains are rather similar in terms of beverage production ability, but strain Lb. johnsonii NRRL B-2178 is a top candidate for functional whey based beverage production. This strain attained titratable acidity of 9.2 °SH after 10 h of fermentation, appropriate odor and cell number of 6.8 log (CFU mL-1).展开更多
文摘以制作干酪过程中产生的乳清为试材,采用截留分子量为10 k Da的再生纤维素对乳清浓缩至最佳倍数(7倍)后,以连续补水的方式洗脱乳糖。在单因素试验的基础上,采用响应面法建立料液比、流速和压力三个主要因素与乳糖脱除率之间的数学模型,对乳糖渗滤工艺进行优化。得到最佳工艺条件为:料液比2∶1(V/V),流速30 m/s,压力0.14 MPa。此条件下,乳糖脱除率达到87.282%。
文摘The aim of this study was selection of appropriate Lactobacillus strains for production of functional whey-based beverage. Sixteen strains of different species of Lactobacillus genera were studied and their abilities to carry out fast production of the beverage with satisfactory fermentation parameters were assessed. Preliminary screening was performed by evaluating volumetric productivity of tested strains after 24 h of the fermentation. Further selection was based on determining beverage production parameters such as fermentation time, titratable acidity, cell number and sensory characteristics. The strains showed remarkable differences in cell number and sensory properties, which were particularly useful in the selection. Based on the obtained results, the strains Lb. casei ssp. casei ATCC 27139 and Lb. johnsonii NRRL B-2178 are good candidates for the beverage production. These strains are rather similar in terms of beverage production ability, but strain Lb. johnsonii NRRL B-2178 is a top candidate for functional whey based beverage production. This strain attained titratable acidity of 9.2 °SH after 10 h of fermentation, appropriate odor and cell number of 6.8 log (CFU mL-1).