Effect of Lactobacillus plantarum isolated from controlled fermentation of wheat bran sourdough on the quality characteristics of pan bread Evaluated by response surface method

Fermentation control with potential application of wheat bran sourdough in novel fermentation technologies is increasing every day to come up to suitable alternatives for additives in bakery. In this research after isolating the dominant starter of the traditional wheat bran sourdough and its identification using PCR and specific primer, it was used to make a traditional sourdough and evaluating the sourdough pan bread qualities by RSM method, under the impression of fermentation time (8, 16 and 24 h), fermentation temperature (26, 32 and 38 °C) and sugar content (1.5, 3 and 4.5 %). In this research, results of evaluating the proportion fitted models showed that by increasing the temperature and fermentation time in a constant sugar content, the titratable acidity (TTA), microbial population dynamics, specific volume, porosity, the total color difference (TCD) and chewiness were significantly increased. However, there was a trend decreasing in the hardness of bread texture (P0.05). Based on the results obtained from the current research, for every dependent variable a model was defined. Also for evaluating the accuracy of the fitted models, lack of fit test was performed and coefficient of variations was determined.