%0 Journal Article
%T High pressure homogenization combined with pH shift treatment: A process to produce physically and oxidatively stable hemp milk.
%A Wang Q
%A Jiang J
%A Xiong YL
%J Food Res Int
%V 106
%N 0
%D 04 2018
%M 29579952
%F 7.425
%R 10.1016/j.foodres.2018.01.021
%X Hemp milk, an emerging beverage with high nutritional value and low allergenicity, is an attractive alternative to dairy, soy, and nut milks. To obtain a non-thermally processed, physically and oxidatively stable hemp milk, high pressure homogenization (HPH) combined with pH shift treatment was investigated. For hemp milk (4% protein, 5% fat) without pH shift, increasing the homogenization pressure (up to 60 MPa) resulted in a more uniform distribution of emulsion droplets (2.2-2.7 μm). When pH shift was applied prior to HPH, large clusters and aggregates of oil droplets (3.5-8.2 μm) were formed. Interestingly, hemp milk with such interactive structures was remarkably stable, showing negligible phase separation within 3-day storage at 4 °C. Moreover, hemp milk made by combined pH shift and HPH exhibited delayed hydroperoxides (expressed as peroxide value, PV) and malondialdehyde (expressed as thiobarbituric acid-reactive substances, TBARS) production, suggesting the resistance of such emulsion cluster structures to radicals. On the other hand, a significant reduction of microbial population was observed in hemp milk prepared by pH shift combined with HPH. The results indicate that the pH shift + HPH combination treatment may potentially be employed for the production of non-thermally processed hemp milk.