Fibrous Fractionation of Cocoa Pod Husks Alkali Extraction
作者单位：Aerospace Center Hospital Aerospace Center Hospital (ASCH)
会议名称：《中国营养学会第十五届全国营养科学大会》
会议日期：2022年
学科分类：0832[工学-食品科学与工程（可授工学、农学学位）] 08[工学] 083201[工学-食品科学]
关 键 词：cocoa pod husks dietary fiber hemicellulose chemical composition alkali extraction rheological properties
摘 要：Cellulose, hemicellulose and lignin from cocoa pod husks were fractionated by alkali solution by using 0.5 mol/L 1.0 mol/L 1.5 mol/L concentration of NaOH for 3 hours in total. The raw materials were pretreated by 1-Cycle and 2-Cycle to obtain cellulose hemicellulose and lignin. The effects of three different concentration extraction solutions and two extraction methods on cellulose yield were compared and chemical and physical properties including water retention capacity, oil retention capacity were analyzed. In this paper, the high yield(52.8%-90.5%) of the total dietary fiber was extracted by alkali extraction. The relatively high total dietary fiber( 50%) content of cacao pod husks indicates good dietary fiber potential. The hemicellulose(7%-15.8%) extracted in 2-Cycles was less than the hemicellulose extracted in 1-Cycle(7.6%-13.7%). The chemical and physical properties including water retention capacity and oil retention capacity were also characterized. Describe the monosaccharides composition of hemicellulose extracted by 1-Cycles. Results showed that the WRC(4.37 g-6.80 g/g) of hemicellulose increased as the concentration of the alkaline solution increased during the extraction process. Conversely, as the concentration of the alkaline solution increased, the ORC decreased(from 6.30 g to 3.76 g). Hemicellulose extracted by 1.5 mol/L NaOH showed shear thinning property, while hemicellulose extracted by 0.5 M NaOH observed more Newtonian fluid property. Methods Alkali extraction previously is shown as a promising method for the separation. 5 g of the dry mill sample was and mixed with 200 mls of three different concentrations of alkali solutions(0.5 mol/L NaOH, 1.0 mol/L NaOH and 1.5 mol/L NaOH) and stirred at 200 rpm, 50 °C. The project designed two extraction methods. 1-Cycle: extraction once. 200 ml NaOH was added in one portion, and extracted at 50 °C, 200 rpm for 3 hours, and then the next step centrifugation was carried out. 2-Cycle: extracted twice. F