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KMID : 0380619820140010049
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Korean Journal of Food Science and Technology
1982 Volume.14 No. 1 p.49 ~ p.56
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Effects of External Conditions on the Emulsifying Property of Proteins
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Abstract
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The effects of measurement conditions on the emulsifying capacity(EC) and emulsion stability(ES) of proteins were studied in order to develop laboratory standard methods for the evaluation of emulsifying properties.
The EC of proteins decreased with the increments of protein concentration and mixing rate. It increased with the increasing oil addition rate up to 0. 8 ㎖/sec, but did not change at 0. 8∼1.2 ㎖/sec. The addition of sodiumchloride enhanced EC of proteins. attaining to the highest EC at 0.3M NaCl for Pro-Fam and O.1M NaCl for Na-caseinate. The ES of Pro-Fam was higher than that of caseinate. The ES was increased by the increments of protein concentration, oil addition volume, mixing rate and mixing time. The EC and ES showed a close relation to the NSI of proteins, reaching to the lowest values of EC and ES at the isoelectric regions of proteins. The laboratory methods for measurements of emulsifying properties of proteins were established. The emulsifying properties of a laboratory-made soybean protein isolate were compared to those of commercial products by using the methods.
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