Gel properties of acidifying nanofiltered and evaporated milk protein concentrates at different temperatures

Journal of Experimental Food Chemistry

ISSN: 2472-0542

Open Access

Gel properties of acidifying nanofiltered and evaporated milk protein concentrates at different temperatures

2nd International Conference on Food Chemistry & Nutrition

July 24-26, 2017 Vancouver, Canada

Yan Li and Liankun Chen

Beijing Technology and Business University, China
China Agricultural University, China

Posters & Accepted Abstracts: J Exp Food Chem

Abstract :

The gel properties of nanofiltered milk protein concentrate (NF-MPC) and evaporated milk protein concentrate (EP-MPC) was compared at different temperatures. The NF-MPC and EP-MPC samples were gelled at 25, 30, 35, 40, and 45├?┬░C with glucono-├?┬┤- lactone (GDL) respectively. The rheological properties (storage modulus and loss tangent), firmness, the degree of whey separation, and the microstructure of EP-MPC and NF-MPC gels were determined. With increasing gelation temperature from 25 to 45├?┬░C, gelation time was significantly shortened and the pH of gelation point was slowly increased. The differences in gel properties between NF-MPC and EP-MPC were significant. EP-MPC formed strong gel networks as well as had the much higher storage modulus (G├ó┬?┬?) and firmness (except for the 25├?┬░C sample) and lower degree of whey separation than gels formed by NF-MPC. The nearly identical maximum in loss tangent (tan ├?┬┤) and similar microstructure were observed in both NF-MPC and EP-MPC gels at the same gelation temperatures. In summary, our results clearly demonstrated that EP-MPC has superior gel properties compared with NF-MPC, but it needs further study on the NF-MPC gel properties with the preheat treatment or calcium addition in practical application.

Biography :

Yan Li is working as Associate Professor at School of Food and Chemical Engineering Beijing Technology and Business University. She is mainly engaged in dairy processing technology research and In-charge of one project founded by National Science Foundation (31401517). She participated in projects like “Eleventh fiveyear”, "Twelfth five-year" science and technology support plan and the projects of National Science Foundation.

Email: [email protected]

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