Acidified milk drinks are products available worldwide in many variations, with pH values ranging from 3.6 to 4.6. Because casein micelles will aggregate and precipitate below their isoelectric point (4.6), the stabilisation of acidified milk drinks is necessary to prevent instability occurring. Acidified milk drinks are usually stabilised with pectin Carboxymethylcellulose (CMC) is commonly chosen as a stabiliser instead of pectin because of its low cost in Asia, especially in China, where a long shelf life is required of many food products. Our previous work reported the stabilising effect of CMC on acidified skim milk drinks (ASMD) (Du et al., 2007, 2009). However, many commercial products actually contain whole milk, which gives
a full-bodied taste because of its high fat content compared with skim milk. Whole milk products seem to be more popular in China. For acidified whole milk drinks (AWMD), creaming is a problem because of the presence of large amounts of fat. The large size and low density of fat may yield stability of AWMD different from that of ASMD. There are limited reports on the application of CMC in AWMD; therefore, there is a need to investigate and understand the CMC-induced stabilisation of AWMD. In the present work, the stabilisation of acidified whole milk by CMC was investigated by monitoring changes in particle size and zeta potential during acidification and sedimentation measurement and compared with acidified skim milk.
Acidified milk drinks are products available worldwide in many variations, with pH values ranging from 3.6 to 4.6. Because casein micelles will aggregate and precipitate below their isoelectric point (4.6), the stabilisation of acidified milk drinks is necessary to prevent instability occurring. Acidified milk drinks are usually stabilised with pectin Carboxymethylcellulose (CMC) is commonly chosen as a stabiliser instead of pectin because of its low cost in Asia, especially in China, where a long shelf life is required of many food products. Our previous work reported the stabilising effect of CMC on acidified skim milk drinks (ASMD) (Du et al., 2007, 2009). However, many commercial products actually contain whole milk, which givesa full-bodied taste because of its high fat content compared with skim milk. Whole milk products seem to be more popular in China. For acidified whole milk drinks (AWMD), creaming is a problem because of the presence of large amounts of fat. The large size and low density of fat may yield stability of AWMD different from that of ASMD. There are limited reports on the application of CMC in AWMD; therefore, there is a need to investigate and understand the CMC-induced stabilisation of AWMD. In the present work, the stabilisation of acidified whole milk by CMC was investigated by monitoring changes in particle size and zeta potential during acidification and sedimentation measurement and compared with acidified skim milk.
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