Screening of frozen-thawed conditions for keeping nutritive compositions and physicochemical characteristics of goat milk

19Citations
Citations of this article
16Readers
Mendeley users who have this article in their library.

Abstract

Frozen milk can help producers overcome the seasonality of goat milk production, low goat production and short lactation periods, and avoid discarding milk during some special periods. We investigated effects of combination between freezing (cryogenic refrigerator of −16 to −20°C or ultra-cryogenic refrigerator of −76 to −80°C) and thawing (homeothermy of 20 to 25°C or refrigeration of 2 to 4°C) on nutritive compositions and physicochemical characteristics of raw goat milk during storage period (80 d). Compared with fresh goat milk, the frozen-thawed milk decreased contents of fat, protein, and lactose, as well as surface tension and stability coefficient, whereas increased effective diameter and polydispersity index. The average values of color values (L*, a*, and b*) in 4 group samples changed from 83.01 to 82.25, −1.40 to −1.54, 3.51 to 3.81, respectively, and the ΔE of most samples did not exceed 2. In contrast to the other 3 frozen-thawed treatments, goat milk treated with ultra-cryogenic freezing-homeothermic thawing (UFHT) possessed higher fat (5.20 g/100 g), smaller effective particle diameter (0.32 µm), and the lowest polydispersity index value (0.26). The color and confocal laser scanning microscopy images of UFHT were similar to those of fresh goat milk, illustrating UFHT was the optimal approach to maintain the natural quality of goat milk. Our finding provides a theoretical basis for producers to freeze surplus milk.

Cite

CITATION STYLE

APA

Yu, Z., Qiao, C., Zhang, X., Yan, L., Li, L., & Liu, Y. (2021). Screening of frozen-thawed conditions for keeping nutritive compositions and physicochemical characteristics of goat milk. Journal of Dairy Science, 104(4), 4108–4118. https://doi.org/10.3168/jds.2020-19238

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free