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ABSTRACT

This article investigates the impact of sesame protein isolate (SPI) and increased calcium in milk on the biochemistry, rheology and micro-structure of cheese. The characteristics of two sets of cheeses made from raw milk and milk of 8% protein substituted by SPI (SPI milk) with 0, 5, 10 and 20 mM calcium addition were investigated. Adding SPI to milk resulted in rennet gel formation with longer coagulation time and lower storage modulus (G′) at 60 min in cheesemaking. The synergistic influence of SPI and calcium resulted in increased hardness, cohesiveness, adhesiveness and meltability during 21 days of cheese aging. Adding calcium to SPI milk resulted in a more compact and regular micro-structure in cheese. Scanning electron microscopy indicated the associative effect of sesame protein and calcium generated greater aggregation in complex cheese micelles, which was key in SPI cheese property formation. Sodium dodecyl sulfate polyacrylamide gel electrophoresis gel electrophoretograms of the wheys and caseins indicated the interaction of sesame protein and casein with calcium. This study is of benefit in the manufacture of novel cheese with traditional orient food to meet with the taste of Chinese people.

PRACTICAL APPLICATION

This research is focused on the influence of sesame protein and calcium ions on the properties of fresh cheese. In recent years, cheese has become increasingly popular in China and its market has increased more than 50% year upon year. To further promote cheese consumption, its nutritional benefits have been emphasized and various efforts have been made to promote cheese and to make it more acceptable to Chinese tastes. The addition of typical Chinese food ingredients into cheese could provide sensory familiarity to local consumers, and at the same time could also help to improve nutritional balance. The result of this research is of great value to the application of plant proteins as they may serve as novel ingredients added to cheese to meet the requirements of this new and fast-growing market.