alexa Effects Of Preheat Treatment And Ca2+ Concentration On The Gelation Properties Of Nanofiltered And Evaporated Milk Protein Concentrates
ISSN 2472-0542

Journal of Experimental Food Chemistry
Open Access

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2nd International Conference on Food Chemistry & Nutrition
July 24-26, 2017 Vancouver, Canada

Yunna Wang, Jialu Cao and Yan Li
China Agricultural University, China
Beijing Technology and Business University, China
Posters & Accepted Abstracts: J Exp Food Chem
DOI: 10.4172/2472-0542-C1-009
Abstract
Milk protein concentrates (MPCs) are highly nutritional and functional products used as newly developed functional ingredients in food industries. The aim of present study is to compare the glucono-δ-lactone(GDL) induced gelation properties of nanofiltered MPC (NF- MPC) and evaporated MPC (EP- MPC) with different preheat treatments (85°C, 30 min; 92°C, 5 min) and Ca2+ concentration (5-40 mmol L-1). The results showed that preheat treatment facilitated gelation. The gel properties, such as elastic modulus (G’), loss tangent (tan δ), and hardness of both NF- MPC and EP- MPC were increased and whey separation decreased. The gel structure had a fine-stranded network with more flexible strands compared with the same properties of unheated MPC. But it was difficult to see differences between the two preheat treatment conditions and two kinds of MPC gels. Effects of the Ca2+ concentration on both MPC gels were complex. Hardness, G’ value and whey separation degree decreased and the gel network structure became unclear, thicker strands and clusters of aggregated particles were formed with the increase of Ca2+ concentration. No significant differences were observed between EP-MPC and NF-MPC in terms of gel network structure and tan δ. However, EP- MPC showed higher hardness, G’ value and lower whey separation degree with the same Ca2+ supplements compared to those of NF-MPC. This result suggested that the application of NF-MPC in food gel properties is no worse than that of EP-MPC. In the case of calcium supplementation, EP-MPC is slightly better than NF-MPC.
Biography

Yunna Wang has her expertise in “Agricultural Products Processing” and “Dairy Science”. In recent years, with "whipping cream" and its raw materials "milk protein concentrate" "anhydrous milk fat" as the basic research objects, she carries out a more systematic research work on the gel properties of milk protein concentrates, the crystallization behavior of milk fat, the whipping properties and the stability of whipping cream. She has already published “Review: Study on the preparation technology and influence factors of whipping cream”, “Review: researches of the application development of whipping cream at home and abroad” (China 's core journals), “Stability and physical properties of recombined dairy cream: Effects of soybean lecithin”, and also participated in academic conferences in related fields both at home and abroad.

Email: [email protected]

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