In this paper, the anthocyanin compounds from Red cabage were extracted by ultrasound-assisted extraction (UAE) technology using acid-ethanol solvent. These natural colorants were immobilized to a non-woven cellulose membrane and a cellophane film using exhaust dyeing method. The anthocyanin extract solutions and cellulosic films loaded with anthocyanin colorant showed visibly distinct colors at all pH range from 1 to 13. The ultraviolet-visible (UV-Vis) spectrum of anthocyanin extract solutions showed a red shift of the maximum peak absorbance to longer wavelengths at higher pH-values, which indicates that chemical structure of anthocyanins have been altered. An application test was conducted for potential use of these dyed films as soybean milk spoilage sensors. The pH-sensing films showed pH changes and spoilage point of soybean milk samples, changing from violet to red. Therefore, the use of these colorimetric pH-sensing films as a diagnostic tool for the detection of food spoilage is a promising path.
Red cabage, Anthocyanin, Cenlulosic material, pH-sensing film.
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TẠP CHÍ KHOA HỌC VÀ CÔNG NGHỆ Giấy phép số37/GP-BTTTT (15/01/2021) Giấy phép sửa đổi, bổ sung số140/GP-BTTTT (05/3/2021) Đơn vị cấp phép:Bộ Thông tin và Truyền thông Cơ quan chủ quản:Trường Đại học Bách Khoa Hà Nội Phó tổng biên tập phụ trách:GS. Đinh Văn Phong