Nghiên cứu điều kiện tiền xử lý thu nhận chất xơ từ vỏ bưởi da xanh (Citrus maxima (Burm.) Merr.)
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Abstract
To improve the recovery yield of dietary fiber obtained from da xanh pomelo (Citrus maxima (Burm.) Merr.), the study was conducted to evaluate the pretreatment process with ethanol 96o on the efficiency of fiber enrichment, expressed in terms of total dietary fiber (TDF), soluble dietary fiber (SDF) and insoluble dietary fiber (IDF) content. The investigated conditions consisted of (i) soaking time (10 - 25 minutes), (ii) soaking temperature (50 - 78.3oC), (iii) materials/ethanol ratio (1/1.25 - 1/5 g/mL) and drying temperature (50 - 70oC). Thereby, pretreatment revealed a greater efficiency of 15.02%, and 49.04 % at TDF, and SDF content than those without pretreatment. The results of the investigation of pretreatment conditions of pomelo’s albedo with ethanol 96o illustrated that soaking overnight (12 hours) at room temperature (30oC) and raw materialethanol ratio of 1:2.5 g/mL followed by drying at 70oC in 5 hours reached the highest level of IDF (42.39 ± 0.10%), TDF (74.68 ± 0.56%) and SDF (32.29 ± 0.54%).
Tóm tắt
Nhằm tăng cường hiệu suất thu hồi chất xơ từ vỏ bưởi da xanh (Citrus maxima (Burm.) Merr.), nghiên cứu đã được thực hiện để đánh giá ảnh hưởng của quá trình tiền xử lý ethanol 96o đến hiệu quả làm giàu chất xơ trong vỏ bưởi da xanh, thể hiện qua hàm lượng chất xơ tổng (TDF), chất xơ tan (SDF) và chất xơ không tan (IDF). Điều kiện khảo sát bao gồm (i) thời gian ngâm (10 - 25 phút); (ii) nhiệt độ ngâm (50 - 78,3oC); (iii) tỷ lệ nguyên liệu/ethanol (1/1,25 - 1/5 g/mL), (iv) nhiệt độ sấy (50 - 70oC). Thông qua đó, tiền xử lý mang lại hiệu quả vượt trội hơn về hàm lượng TDF và SDF thu nhận lần lượt là 15,02% và 49,04% so với không qua tiền xử lý. Kết quả khảo sát điều kiện tiền xử lý vỏ bưởi da xanh bằng ethanol 96o cho thấy ngâm qua đêm (12 giờ) ở nhiệt độ phòng (30oC) với tỷ lệ nguyên liệu:ethanol 1:2,5 g/mL, sau đó sấy ở 70oC trong 5 giờ đạt được giá trị cao nhất của IDF (42,39 ± 0,10%), TDF (74,68 ± 0,56%) và SDF (32,29 ± 0,54%).
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