Abstract: Provided is a low-molecular-weight holothurian glycosarninoglycan, with the constituent units thereof being a glucuronic acid group, an N-acetaminogalactose group and a fucose group, and a sulfate ester group or acetyl ester group thereof. Glucuronic acid and N-acetaminogalactose are interconnected via ?(1-3) and ?(1-4) glucosidic bonds to form a backbone of a disaccharide repeating structural unit, and a fucose group is connected to the backbone as a side chain. On a molar ratio basis, the ratio of the glucuronic acid group:the N-acetaminogalactose group:the fucose group is 1:(0.8-1.2):(0.6-1.2). In the structure of the low-molecular-weight holothurian glycosaminoglycan, 10-30% of glucuronic acid groups are modified, on the 2-position, with a sulfate ester group, and the rest are hydroxyl groups; and a proportion of 10-30% of fucose groups is modified, on the 2-position, with an acetyl ester group, and the rest are hydroxyl or sulfate ester groups.

Abstract: Disclosed are a Piper laetispicum extract and a preparation method therefor and a use thereof. The Piper laetispicum extract includes any one or more of sesamin, (2E,6E)-N-isobutyl-7-(3,4-methylenedioxyphenyl)heptadienamide, (2E,4E)-N-isobutyldodecane-2,4-dieneamide, (2E,4E)-N-isobutyl-15-phenylpentadeca-2,4-dieneamide, (2E,4E,14Z)—N-isobutyleicosane-2,4,14-trienamide, and (2E,4E)-N-isobutyl-13-phenyltrideca-2,4-dieneamide. The Piper laetispicum extract can prevent depression.

Abstract: Provided is a low-molecular-weight holothurian glycosarninoglycan, with the constituent units thereof being a glucuronic acid group, an N-acetaminogalactose group and a fucose group, and a sulfate ester group or acetyl ester group thereof. Glucuronic acid and N-acetaminogalactose are interconnected via ?(1-3) and ?(1-4) glucosidic bonds to form a backbone of a disaccharide repeating structural unit, and a fucose group is connected to the backbone as a side chain. On a molar ratio basis, the ratio of the glucuronic acid group:the N-acetaminogalactose group:the fucose group is 1:(0.8-1.2):(0.6-1.2). In the structure of the low-molecular-weight holothurian glycosaminoglycan, 10-30% of glucuronic acid groups are modified, on the 2-position, with a sulfate ester group, and the rest are hydroxyl groups; and a proportion of 10-30% of fucose groups is modified, on the 2-position, with an acetyl ester group, and the rest are hydroxyl or sulfate ester groups.

Abstract: Disclosed are a Piper laetispicum extract and a preparation method therefor and a use thereof. The Piper laetispicum extract includes any one or more of sesamin, (2E,6E)-N-isobutyl-7-(3,4-methylenedioxyphenyl)heptadienamide, (2E,4E)-N-isobutyldodecane-2,4-dieneamide, (2E,4E)-N-isobutyl-15-phenylpentadeca-2,4-dieneamide, (2E,4E,14Z)—N-isobutyleicosane-2,4,14-trienamide, and (2E,4E)-N-isobutyl-13-phenyltrideca-2,4-dieneamide. The Piper laetispicum extract can prevent depression.