Paper
Characterisation of malolactic conversion by Oenococcus oeni to reduce the acidity of apple juice
Published May 1, 2013 · Jing Gao, H. Rupasinghe, Nancy L. Pitts
International Journal of Food Science and Technology
4
Citations
0
Influential Citations
Abstract
Summary The high concentration of malic acid is responsible for the acidity and sourness in apple juice. Bio-conversion of malic acid to lactic acid through malolactic conversion (MC) in apple juice using Oenococcus oeni was investigated. When apple juice was inoculated with O. oeni (1 × 106 CFU mL−1), over 90% of malic acid was converted into lactic acid within 96 h at room temperature. When pH of apple juice was adjusted to 4.1 prior to inoculation, MC was completed within 60 h. MC was enhanced at a higher temperature (30°C) when compared with room temperature. The rate of MC was directly proportional to the number of bacteria added and MC was completed within 24 h at 1 × 109 CFU mL−1 initial cell density. MC occurred equally under aerobic and anaerobic conditions. The sensory analysis of partial MC-applied juice when compared against control revealed potential for use of MC for manufacture of low-acid apple juice.
Malolactic conversion by Oenococcus oeni effectively reduces the acidity of apple juice, potentially enabling the production of low-acid apple juice.
Full text analysis coming soon...