| Pectin from jackfruit peel was extracted by enzymatic method. The effects of enzyme concentration,enzymolysis time, temperature and pH on the yield of pectin were studied in this paper. Based on single factor test,extraction process was optimized by response surface methodology. Results showed that the yield of pectin firstly increased and then decreased with the increase of enzyme concentration, prolonging of enzymolysis time, rise of temperature and pH. The optimal process conditions were as follows: enzyme dosage of 0.6% for 6.2 h, pH 4.7 at 50. In these conditions, the practical value of pectin yield was 11.3%. FT-IR was applied to determine the structure of extract, and the results demonstrated that the extract was low-ester pectin including some methoxyl and acetyl in pectin molecule. |
