STUDY ON APPLICATIONS OF CARRAGEENAN OBTAINED FROM Kappaphycus alvarezii ALGA TO MINIMIZE DRY MATTER LOSS DURING PRESERVATION OF FROZEN SHRIMP

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Tác giả: Thi Ngoc Nhon Hoang, Thi My Huong Nguyen, Thi Hong Van Truong

Ngôn ngữ: eng

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Thông tin xuất bản: Tạp chí Khoa học Công nghệ và Thực phẩm (Tên mới: Tạp chí Khoa học Đại học Công Thương), 2020

Mô tả vật lý: tr.103

Bộ sưu tập: Metadata

ID: 294100

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Carrageenan was extracted from Kappaphycus alvarezii alga for application in shrimp preservation to reduce the loss of dry matter during preserving frozen shrimp. The main material in this study is dried alga. The solution 3% NaOH was used to remove color compounds and lipids. The selected extraction conditions include distilled water, pH 7, the ratio of material/solvent 1/40 (w/v) at 80 °C for 2 hours, 1% CaCl2 for the precipitation. The semi-refined carrageenan powder was ivory white, uniform smoothness, 9.21% moisture content. The recovery yield of the extraction was 65.96%. The solution used for shrimp coating was a mixture of 0.3 g carrageenan, 0.075 g glycerol, 0.075g polyethylene glycol 6000, the ratio of the mixture and distilled water 1/40 (w/w). The mixture was stirred in a heating condition at 80 °C for 30 minutes, then cooled down. Next, the shrimp were dipped in solution before freezing, shrimp samples were frozen to investigate the loss of dry matter between the control sample and the shrimp immersed in the preserved solution for 12 weeks.Nghiên cứu này thực hiện trích ly carrageenan từ rong sụn (Kappaphycus alvarezii) và ứng dụng trong bảo quản tôm nhằm giảm sự hao hụt chất khô trong quá trình bảo quản tôm lạnh đông. Rong sụn sử dụng trong nghiên cứu này là loại rong khô. Sử dụng NaOH 3% để loại hợp chất màu và lipid. Carrageenan từ rong sụn thu được bằng phương pháp trích ly với dung môi nước cất, tỷ lệ nguyên liệu/dung môi 1/40 (w/v), nhiệt độ trích ly 80 °C, thời gian trích ly 2 giờ và số lần trích ly là 1, tủa dung dịch thu được bằng CaCl2 1%. Quy trình sản xuất carrageenan bán tinh chế thu được carrageenan dạng bột, màu trắng ngà, độ mịn đồng nhất, hiệu suất thu hồi carragenaan đạt 65,96%. Dung dịch bảo quản tôm là hỗn hợp gồm 0,3 g carrageenan, 0,075 g glycerol, 0,075 g polyethylene glycol 6000, tỷ lệ hỗn hợp/ dung môi nước cất là 1/40. Hỗn hợp được khuấy từ gia nhiệt ở 80 °C trong 30 phút, để nguội và tôm được nhúng vào dung dịch trước khi cấp đông, mẫu tôm được cấp đông để khảo sát sự hao hụt chất khô giữa mẫu đối chứng và mẫu có nhúng dung dịch bảo quản trong 12 tuần.

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