Sodium caseinate/carboxymethylcellulose interactions at oil-water interface: Relationship to emulsion stability
Sodium caseinate/carboxymethylcellulose interactions at oil-water interface: Relationship to emulsion stability
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DOI：
10.1016/j.foodchem.2011.12.014
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发表时间：
2012-06-15
期刊：
影响因子：
8.8
通讯作者：
Zhao, Mouming
中科院分区：
文献类型：
--
作者：
Liu, Liya;Zhao, Qiangzhong;Zhao, Mouming
研究了羧甲基纤维素（CMC）对酪蛋白酸钠（CN）水包油型乳状液性质的影响。在pH 7时，随着CMC浓度的增加，膜表面蛋白覆盖率逐渐增加，随后对β-酪蛋白有优先吸附作用。而在pH 4时，在0和0.3wt.%之间注意到表面蛋白覆盖率的急剧下降CMC，蛋白质组成无明显差异。zeta电位测量表明，CMC吸附到CN-包被的液滴在pH 4-5，但不是在pH 6-7。因此，过量的非吸附CMC在中性乳液中引起耗尽絮凝。然而，含有高水平CMC（> 0.3wt.%）的酸性乳液由于多层结构的形成，在储存60天后保持稳定。在pH 4时，CMC在高NaCl浓度下从液滴表面解吸，导致较低的乳液稳定性。(C)2011爱思唯尔有限公司版权所有。
The effect of carboxymethylcellulose (CMC) on the properties of oil-in-water emulsions prepared with sodium caseinate (CN) was studied at different pHs (4-7). At pH 7, the surface protein coverage increased gradually with increasing CMC concentration, followed by a preferential adsorption of beta-casein. While at pH 4, a sharp decrease in surface protein coverage was noted between 0 and 0.3 wt.% CMC, and no obvious difference in protein composition was observed. zeta-Potential measurements indicated that CMC adsorbed onto the CN-coated droplets at pH 4-5, but not at pH 6-7. As a result, the excess of non-adsorbed CMC induced depletion flocculation in the neutral emulsions. However, the acidic emulsions containing high levels of CMC (>0.3 wt.%) remained stable after 60 days of storage due to the formation of multilayer structures. At pH 4, CMC desorbed from the droplet surfaces at high NaCl concentrations, leading to lower emulsion stability. (C) 2011 Elsevier Ltd. All rights reserved.