Anthocyanins extraction from purple sweet potato (Ipomoea batatas (L.) Lam) : the effect of pH values on natural color

Nhut Pham, T. and Quoc Toan, T. and Duc Lam, T and Vu-Quang, H. and Vo, Dai-Viet N. and Anh Vy, T. and Bui, Le Minh (2019) Anthocyanins extraction from purple sweet potato (Ipomoea batatas (L.) Lam) : the effect of pH values on natural color. In: International Conference on Mechanical Engineering, Materials Science and Civil Engineering, ICMEMSCE 2018, 21 - 22 December 2018 , Xiamen, China. pp. 1-6., 542 (1). ISSN 1757-8981 (Print); 1757-899X (Online)

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Anthocyanins are widely used in the food industry as safe natural colorants thanks to their benefits, attractive colors and safety for consumption. The first objective of this study was to evaluate anthocyanins extraction from Vietnam purple sweet potato (Ipomoea batatas (L.) Lam) for use as food coloring. Different extraction temperatures of solvent ethanol (40 - 70%), duration of extraction (40 - 80 min), temperature extraction (30 - 70°C) and liquid-solid ratios (4:1 - 8:1 mL/g) were selected in order to extract purple sweet potato. Second, this study examines the anthocyanin color behavior at various pH levels in aqueous solutions levels ranging from 1.0 to 14.0. At low pH (acidic conditions), anthocyanins are stable and gives a red color. Meanwhile, increasing the pH value of anthocyanin will change the color from red to pink, violet, blue, green and yellow. This variation suggested that anthocyanin could be utilized as a possible pH color indicator in commercial packaging industry and agriculture.

Item Type: Conference or Workshop Item (Lecture)
Additional Information: Indexed by Scopus; Tri Nhut Pham, Tran Quoc Toan, Tri Duc Lam, Hieu Vu-Quang, Dai-Viet N. Vo, Tran Anh Vy, Le Minh Bui ;
Uncontrolled Keywords: Acidic conditions; Color indicator; Extraction temperatures; Ipomoea batatas (L.) Lam; Natural colorants; Packaging industry; Purple sweet potatoes; Temperature extraction
Subjects: Q Science > QD Chemistry
Q Science > QK Botany
T Technology > TP Chemical technology
Faculty/Division: Faculty of Chemical & Natural Resources Engineering
Depositing User: Mrs Norsaini Abdul Samat
Date Deposited: 12 Dec 2019 03:43
Last Modified: 12 Dec 2019 03:43
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