Abstract: In this article, the precipitation conditions of extracting pectin from appleresidue by salting out were discussed. In our experiments, five types of salts were first systematically used to make comparison study on pectin precipitation, The aluminum sulfate was considered the optimal precipitant. Meanwhile, by studying the affecting factors suchas salt amount, pH value, temperature, and precipitation time, the optimal process conditions were obtained, which provide a foundation for the scale-up batch process.

Key words: Apple residue , Salting out , Extract , Pectin