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Journal of Zhejiang University SCIENCE B 1998 Vol.-1 No.-1 P.

http://doi.org/10.1631/jzus.B2400269


Dynamic changes in physiochemical, structural and flavor characteristics of ginger-juice milk curd


Author(s):  Haifeng PAN, Wenna BAO, Yi CHEN, Hongxiu LIAO

Affiliation(s):  School of Life Sciences and Health, Huzhou College, Huzhou 313000, China; more

Corresponding email(s):   wennabao@163.com

Key Words:  Ginger, Milk coagulation, Characterization, Volatile compounds


Haifeng PAN, Wenna BAO, Yi CHEN, Hongxiu LIAO. Dynamic changes in physiochemical, structural and flavor characteristics of ginger-juice milk curd[J]. Journal of Zhejiang University Science B, 1998, -1(-1): .

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Abstract: 
Dynamic changes in the physiochemical, structural and flavor characteristics of ginger-juice milk curd were explored by texture analysis, scanning electron microscopy, rheometry, electronic tongue, gas chromatography and mass spectrometry. Protein electrophoresis showed that ginger juice could hydrolyse αs-, β-, and κ-casein. Curd formation was initiated at 90 s, marked by significant changes in intensity detected via intrinsic fluorescence. The content of soluble protein and calcium decreased rapidly during coagulation, while the caseinolytic activity, storage moduli, loss moduli, hardness, adhesiveness and water holding capacity increased, resulting in a denser gel structure with smaller pores and fewer cavitations as observed by scanning electron microscopy. Electronic tongue analysis indicated that milk could neutralize the astringency and saltiness of ginger juice, rendering the taste of ginger-juice milk curd more akin to that of milk. About 70 volatile components were detected in ginger-juice milk curd. α-Zingiberene, α-curcumene, β-sesquiphellandrene and β-bisabolene were the predominant volatile flavor compounds, exhibiting an initial decrease in content followed by stability after 90 s. Decanoic acid, γ-elemene and caryophyllene were identified as unique volatile compounds after mixture of milk and ginger juice. Understanding the dynamic changes in these characteristics during coagulation holds significant importance for the production of ginger-juice milk curd.

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