Persea Americana Mill seed extracts: Understanding insights into the antioxidant and antityrosinase activities and effects on preserving qualities of whiteleg shrimp (Litopenaus vannamei) during refrigerated storage

• Published in: Food chemistry Vol. 373; no. Pt B; p. 131469
• Main Authors: Do, Duyen Thi Bich, Bui, Trung Huu, Phan, Dao Thi Anh
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 30.03.2022
• Subjects: Antioxidant; Antioxidants; Avocado seed extract; Flavonoids; Lipid Peroxidation; Melanosis; Persea; Plant Extracts; Polyphenoloxidase; White-leg shrimp; Avocado seed extract; Melanosis; White-leg shrimp; Antioxidant; Polyphenoloxidase
• ISSN: 0308-8146; 1873-7072
• DOI: 10.1016/j.foodchem.2021.131469

•Avocado seed extracts were comprehensive studied on quality preservation of shrimps.•47 bio-active compounds were identified from the seed extracts.•Changes in melanosis score, TBARs, pH and microorganisms in shrimps were investigated.•TN-1 and PD-2 extracts showed overall higher preservative effects than SMS additive.•The great preservative activity could be attributed to the high polyphenolic content. An ethanol extract of avocado seed (TN-1) and six smaller fractions (PD-1 to PD-6) were prepared. Most of the extracts exhibited scavenging DPPH radical, reducing Fe3+ to Fe2+, and inhibiting polyphenoloxidase, consistently matching with their high polyphenolic content (p < 0.05). Most of the 47 compounds identified from TN-1 were classified into phenolic acid, condensed tannin, flavonoid, fatty acids, and alkaloids. Two extracts TN-1 and PD-2 (0.025%, w/v) were used to treat white-leg shrimp and the quality changes were evaluated compared to those treated with sodium metabisulfite (1.25%, w/v) and controls (without treatment) during 8-day storage at 2 °C. Changes in melanosis scores, lipid peroxidation, pHs, microorganisms, and nutrient in shrimps treated with the extracts were comparable to or even much better than others. These results promise a potential use of avocado seed extract as a cost-effective, eco-friendly, and effective alternative to commercial additives in shrimp storage.