SEPARATION AND CHARACTERIZATION OF PECTIN FROM JUICE PROCESSING RESIDUE EXTRACTED BY SUB-CRITICAL WATER
Citrus Junos is an evergreen tree whose fruit processed into juice and often preferred to vinegar as an ingredient in sauces and salad dressing for its special flavor. Most food processing residues are disposed without being recycled. These residues are mainly composed of the part of peel, juice sack and seed. Especially, peel includes valuable hydrocarbons such as terpenoid and carbohydrate such as pectin and cellulose. Sub-critical water has solubility and reactive selectivity to polar substance carbohydrate such as pectin and cellulose based on pressure and temperature. Pectin is composed of an acidic polysaccharide and several types of neutral sugars. The main chain consists of α-1, 4-linked D-galacuronic acid, which is partly methyl esterified. Conventionally using mild acid or chelating agent, pectin can be extracted and separated from the waste of beet pulp and citrus fruits such as lemon and apple pomace, which is an effective utilization of industrial waste. In this work, we aimed to develop an effective separation method for pectin using subcritical water from the residue of Citrus junos and to examine the characteristics of pectin. Experimental apparatus we used was semi-continuous flow reactor. Experimental condition follows: at the temperature range of 110-160℃, at the pressure range of 4-30MPa. As a result, the yield of pectin was more than 75％ at the temperature range from 120-140℃ and pressure range from 4-30MPa. And they lack the amount of impurities. Extracted at higher temperature 160℃, molecular weight of pectin was lower molecules. On the other hand, pectin extracted at 120℃ and 140℃ were almost the same molecular weight of commercial pectin. This result indicates that different molecular weight pectin was able to recover by changing the extraction temperature.
Munehiro Hoshino Masahiro Tanaka Akihiro Terada Mitsuru Sasaki Motonobu Goto
ASCII Co.Ltd, 2425 Tabara, Kawasaki-mati Tagawa-Gun, Fukuoka, 827-0004,Japan Graduate School of Science and Technology, Kumamoto University,2-39-1 Kurokami, Kumamoto 860-8555,Ja
国际会议
成都
英文
223-228
2009-10-11（万方平台首次上网日期，不代表论文的发表时间）