Abstract: This paper demonstrates the characteristics of polyethylene, and PMA can be in various fields of application.Artificial chemical synthesis of poly malic acid step is complicated and costly,sowe turn to the production of bio-fermentation malic acid.Set up screening programs in screening poly malic acid producing bacteria from the natural world.Extraction of a large number of samples.Through the succinate medium and L-malic acid medium al training.Through the comparison of observed patterns,selected with similar bacteria colony.After fermentation,identification of fermentation products with Paper chromatography and liquid chromatography to determine whether it contains malic acid.
Keywords: Biopolymer; poly malic acid; bio-fermentation; Aureobasidium pullulans; paper chromatography