2.1 Materials
Commercial walnut butter-1 (SS1, purchased from Shengyuan Agricultural
Technology Co., Ltd), commercial walnut butter-2 (SS2, purchased from
Tianjin Jizhou Green Food Group Co., Ltd), commercial walnut butter-3
(SS3, Purchased from Nanshizhao Food Group Co., Ltd); defatted walnut
meal(purchased from Hebei Chenxing Biotechnology Co., Ltd); medium-chain
triglyceride(purchased from Wuhan Kangcan Biotechnology Co., Ltd),
diglyceride(purchased from Xi’an Huageng Biotechnology Co., Ltd), and
conjugated linoleic acid lipid (Purchased from Qingdao Aohai
Biotechnology Co., Ltd, all three FL are food grade). All chemicals were
purchased from Sinopharm Chemical Reagent Co.,Ltd. They included: Methyl
red indicator, methyl blue indicator, petroleum ether, sodium dodecyl
sulfate.