Study on production of organic acid rust remover from passion fruit fermented by Aspergillus Niger

Abstract

Organic acid and rust remover based on citric acid were gradually praised by the industry because of its environmental protection and good derusting effect. In this paper, the production cycle of citric acid by Aspergillus Niger shaking flask fermentation was studied with Passion Fruit/Shell, and the rust removal effect of the product was preliminarily verified. The cultivation factors included Passion Fruit/Shell 20%+Sucrose 5%, 35°C, pH 5.0-5.5, shaking table 150 r/min, the fermentation cycle could be completed in 4-5 days, and the pH in fruit fermentation broth decreased to 2.7. At room temperature, the derusting effect of 1 time diluted fruit fermentation broth equaled that of 3%commercial citric acid, the rust removal time could prolonged properly at low temperature. The resultshad a guiding significance for producing organic rust remover from Passion Fruit by Aspergillus Niger.