Walnut kernel chemical composition

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Walnut kernels contain 22.18% crude protein, of which soluble protein is composed of glutamic acid, [3] followed by arginine and aspartic acid. Crude lipids 64.23%, of which neutral lipids account for 93.05%; neutral lipids include triacylglycerol 82.05%, sterol lipids 3.86%, and free fatty acids 4.80%. Fatty acids in total lipids and neutral lipids are mainly subacids (linoleic acid) 64.48%-69.95% and oleic acid (oleic acid) 13.89%-15.36%; the fatty acid contained in triacylglycerol is mainly linolenic acid 69.98; the non-saponified part of sterol ester is mainly β-sitosterol ( β-sitosterol), and a small amount of campesterol (campesterol), stigmasterol (stigmasterol), oat ster-5-enol (△-avenasterol), stigmasterol (△-stigmasterol); carbohydrates 13 %; A variety of free essential amino acids; isoleucine, leucine, tryptophan, phenylalanie, valine, threonine ( Threonine) and lysine (lysine), etc., whose content is 47.50% of the total amino acids.

The fruit contains 1,4-naphthoquinone (1,4-naphthoquinone), juglone, 4-hydroxy-1-naphthyl-β-D-glucopyranoside (4-hydroxy-1-naptaleny-β) -D-glucopyranoside), 4,8-dihydroxy-1-naphthyl-β-D-glucopyranoside (4,8-di-hydroxy-1-naphthalenyl-β-D-glucopyranoside), potassium, calcium, Iron, manganese, zinc, copper, strontium and other trace elements, [3] immature fruit Fu contains vitamin C (8349-12644mg/100g dry weight). Peel salicylic acid, p-hydroxybenzoic acid, vanillic acid, gentisic acid, p-hydroxyphenyllactic acid, gallic Gallic acid, p-coumaric acid, ferulic acid, caffeic acid, sinapic acid, pro-tocatechuic acid , Syrigic acid, and chlorgeuic acid.

The outer peel of the unripe fruit contains α-hydrojuglone, β-hydrojuglone, and α-hydrojuglone-4-β-D-glucopyranoside (α-hydroju-glone- 4-β-D-glucopyranoside), 1,4-naphthoquinone, 2-methyl-1,4-naphthoquinone (2-methyl-1,4-naphthoquinone), juglone, 5-hydroxy-2-methyl Group-1,4-naphthoquinone (5-hydroxy-2-methyl-1,4-naphthoquinone), 5-hydroxy-3-methyl-1,4-naphthoquinone (5-hydroxy-3-metnyl-1, 4-naphthoquinone), 2.3-dimethyl-5-hydroxy-1,4-naphthoquinone (2,3-dimethyl-5-hydroxy-1,4-naphthoquinone) and 2,3-dihydro-5-hydroxy- 1,4-Naphthoquinone (2,3-dihydro-5-hydroxy-1,4-naphtho-quinone) and 2,3-dihydro-5-hydroxy-2-methyl-1,4-naphtho-quinone (2 , 3-dihydro-5-hy-droxy-2-methyl-1,4-naphthoquinone).