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Study on extraction of tannins from the garcinia mangostana linn peel in Viet Nam

The tannin contents (% w /w dry matter) have been determined by the Lowenthal method, which were 13.80; 13.91; 14.15 and 14.50 in the samples from Vinh Long, Can Tho, Binh Duong and Tra Vinh, respectively. This study focused on the extraction of the tannin compounds from the Garcinia mangostana Linn for applications in food industry, especially in the wine-producing industry. | Vietnam Journal of Science and Technology 56 (4A) (2018) 113-120 STUDY ON EXTRACTION OF TANNINS FROM THE GARCINIA MANGOSTANA LINN PEEL IN VIET NAM Nguyen Thi Hien1, *, Hoang Dinh Hoa2, Nguyen Quynh Hoa2, Pham Thi Tram2, Nguyen Thi Minh Tu2, * 1 University of Economic and Technical Industries, 353 Tran Hung Dao street, Ba Trieu Precinct, Nam Dinh City 2 School of Biotechnology and Food Technology, Hanoi University of Science and Technology, No. 1, Dai Co Viet, Ha Noi * Email: tu.nguyenthiminh@hust.edu.vn, hiennt@uneti.edu.vn Received: 21 September 2018; Accepted for publication: 11 October 2018 ABSTRACT Garcinia mangostana Linn is known as the "queen of fruit" in Viet Nam, which is grown in the provinces of the Mekong Delta and the South Eastern area. Many researches showed that the pericarp of this fruit has many active components, such as xanthones, anthocyanins, tannins, etc. Tannins content of Gacinia mangostana Linn peel from four regions (Can Tho, Tra Vinh, Bình Duong and Vinh Long provinces) in Viet Nam was investigated. The tannin contents (% w /w dry matter) have been determined by the Lowenthal method, which were 13.80; 13.91; 14.15 and 14.50 in the samples from Vinh Long, Can Tho, Binh Duong and Tra Vinh, respectively. This study focused on the extraction of the tannin compounds from the Garcinia mangostana Linn for applications in food industry, especially in the wine-producing industry. Ethanol (60 %) has been used for the extraction of tannins. The ratio of solvent to material of 20 (v/w), temperature at 60 oC for the duration of 120 minutes were selected to extract tannin from mangosteen peel powder. The extraction efficiency was 87.35 %. Material treated with Termamyl SC or Pectinex Ultra SP-L enzymes, will give the extraction efficiency higher than without enzyme pretreatment. Keywords: Garcinia mangostana, extraction, tannin, Termamyl SC, Pectinex Ultra SP-L. 1. INTRODUCTION Gacinia mangostana Linn is one of the tropical plants grown in many .