Published: CABEQ 19 (4) (2005) 383–389
Paper type: Original Scientific Paper

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Lactic Acid Production from Kitchen Waste with a Newly Characterized Strain of Lactobacillus plantarum

Q. Wang, X. M. Wang, N. Q. Ren and X. Q. Wang

To enhance the fermentative production of lactic acid (LA) from kitchen waste, a strain of high-yield lactic acid bacterium, designated as TD46, was characterized and its fermentation profiles were investigated. The strain TD46 could produce 91.34 g l–1 of LA from 100 g l–1 of glucose in 96 h of fermentation at pH 5.5~6.0 and 30 °C. On the basis of its fermentation ability to 49 carbohydrates and additional physio-biochemical tests, the strain TD46 was tentatively identified as Lactobacillus plantarum. The strain TD46 produced 28.85 g l–1 of LA from non-autoclaved kitchen waste in 48 h of fermentation at pH 5.5~6.0, which was 75.1 % higher than that of the spontaneous fermentation without inoculum (control). Meanwhile, 0.39 g g–1 of LA yield and 0.60 g l–1 h–1 of average productivity were reached, respectively. This study shows that enhancement of LA production from kitchen waste can be realized by using the high-yield strain TD46.

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kitchen waste, lactic acid, Lactobacillus plantarum, fermentation