Fig. 5From: Protein hydrolysis and fermentation under methanogenic and acidifying conditionsConcentration of VFAs from gelatine degradation at pH7 (a) versus at pH5 (b) in the batch experiment at 35 °C. Data expressed as mean value (n = 3, with standard deviation less than 5%). Acetate (open square), propionate (open circle), i-butyrate (open triangle), n-butyrate (open diamond), i-valerate (x), n-valerate (+)Back to article page