Resumen

SERNA COCK, Liliana  y  RODRIGUEZ DE STOUVENEL, Aida. Lactic acid fermentative production using waste from the harvest of green sugar cane as a substrate. INCI [online]. 2007, vol.32, n.5, pp.328-332. ISSN 0378-1844.

Waste products from the harvest of green sugar cane (var. CC 85-92), were tested as a substrate in batch type fermentative production of lactic acid. The fermentations were carried out at 32°C, pH 6.0, with juice obtained from cane tops and leaves (JTL) and Lactococcus lactis subs lactis isolated from the same variety of cane. Lactic acid concentration (LA), substrate conversion (SC), biomass concentration, velocity of product formation (r_p) and yield (Y_p/s) were measured, and the results were compared with those of fermentations using the same strain in MRS culture medium, with 60g·l^-1 of glucose. Lactic acid concentrations up to 28.5g·l^-1 with a yield of 0.85g·g^-1 were obtained using JTL medium in a 48h incubation period. JTL and MRS showed statistically significant differences in Y_p/s, SC and biomass concentration, while JTL and MRS were not significantly different in LA and r_p, suggesting that waste products from the sugar cane harvest could be used as a cheap raw material for the fermentative production of lactic acid.

Palabras clave : Green Sugar Cane; Lactococcus lactis; Sugar Cane Leaves; Sugar Cane Tops.