Huỳnh Thị Phương Thảo , Hà Thanh Toàn , Trần Chí Nhân , Châu Trùng Dương Lưu Thái Danh *

* Tác giả liên hệ (ltdanh@ctu.edu.vn)

Abstract

The study was aimed to compare the yield, the content of total polyphenol (TPC), flavonoids (TFC) and antioxidant activity of extracts from three green orange cultivars (cv. Sanh, Xoan and Mat) and Navel cultivar by soaking and Soxhlet method. The antioxidant activity of the extract was determined by DPPH, ABTS, FRAP and RP assays. The results showed that the yield of extracts by Soxhlet method was higher than that of the soaking method in four orange cultivars. The extract from Sanh cultivar by Soxhlet method was the highest yield (15.1%) followed by the extract from Sanh cultivar (11.1%). However, TPC and TFC of the extracts by Soxhlet method were lower than soaking method, ranging from 25.8 – 46.7 mg GAE/g and 16.5 – 30.5 mg QE/g, respectively. The extracts by soaking method had higher antioxidant activity than Soxhlet method. The extract from Xoan cultivar by soaking and Soxhlet method had the highest TPC and TFC content but the extract using the soaking method had the highest antioxidant activity. In summary, Soxhlet method had a higher yield but lower antioxidant activity than soaking method.

Keywords: Antioxidant activity, extracts, extraction method, flavonoids, orange peels, polyphenols

Tóm tắt

Nghiên cứu được thực hiện nhằm so sánh hiệu suất thu hồi, hàm lượng polyphenol tổng số (TPC), flavonoid tổng số (TFC) và khả năng chống oxy hóa của cao chiết từ ba giống cam vỏ xanh (cam Sành, Xoàn và Mật) và giống cam Navel bằng phương pháp chiết ngâm dầm và Soxhlet. Khả năng chống oxy hóa được xác định bằng thử nghiệm DPPH, ABTS, FRAP và RP. Kết quả, hiệu suất thu hồi cao chiết bằng Soxhlet cao hơn ngâm dầm ở bốn giống cam. Cao chiết cam Sành bằng Soxhlet có hiệu suất cao nhất (15,1%) theo sau là cao chiết cam Xoàn (11,1%). Tuy nhiên, TPC và TFC của cao chiết bằng Soxhlet thấp hơn ngâm dầm, lần lượt là 25,8 – 46,7 mg GAE/g và 16,5 – 30,5 mg QE/g. Cao chiết ngâm dầm có khả năng chống oxy hóa ở các thử nghiệm cao hơn Soxhlet. Cao chiết cam Xoàn bằng ngâm dầm và Soxhlet có hàm lượng TPC và TFC cao nhất nhưng cao chiết ngâm dầm có khả năng chống oxy hóa cao nhất. Tóm lại, Soxhlet có hiệu suất thu hồi cao nhưng khả năng chống oxy hóa thấp hơn ngâm dầm.

Từ khóa: Cao chiết, phương pháp trích ly, polyphenol, flavonoid, hoạt tính chống oxy hoá, vỏ cam

Article Details

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