Research highlightsi. Dough development parameters (T1 and Hm) decreased (p<0.05) compared to the control.ii. H'm; SDLS10 and SDLP30, higher (p<0.05) than control, R3; SDLS30 and SDLP10, similar to control.iii. Hardness, chewiness: at 10% addition lower (p<0.05) than control, higher (p<0.05) at 30%.iv. Apart from SBLP10, all sourdough breads had similar or higher specific volume than control.v. Anti-staling sourdough effect: maintain high moisture content, low hardness and chewiness values
IntroductionConsumer preference for nutritious and healthy foods has not only posed new challenges to the baking industry, but encouraged development of new and novel bakery products. Market research and development trends for alternative cereals such as buckwheat or legume flours such as soy flour or in combination with wheat flour such as soy wheat flour in the baking industry have continued to rise.1,2 This has primarily been done to compensate the wheat flour deficiencies.
3For instance, soybean a rich source of quality vegetable proteins has been used to improve the nutritional and functional properties 4 of the end product. However, in wheat bread preparation, addition of both low and high levels of alternative flours such as soy flour has been associated with a decline in bread quality parameters like loaf volume, poor crumb characteristics 5-7 and overall lowering acceptability. Therefore, the use of techniques such as fermentation and enzyme treatment have been explored to improve their functionality.Sourdough, a leavening bread agent in ancient times, is now used industrially to improve technological and functional properties of baked products. This shift that has enabled development of novel fermentation products, technologies and starter cultures with defined metabolic properties. 8,9 Sourdough addition in bread has been found to positively improve the flavour, textural, anti-staling and biological value of the end product. All resulting from microbial and enzymatic conversions associated with the lactic acid bacteria and yeasts during sourdough fermentation.9,10 During sourdough fermentation, microbial metabolism creates a favourable acidic environment which activates numerous enzymes produced by the LAB proteolytic system thus enable synthesis of microbial metabolites.
AbstractSoy sourdough fermented by lactic acid bacteria (LAB), Lactobacillus plantarum and Lactobacillus sanfranciscensis, added at 10 and 30% effect on dough fermentation, textural and shelf life properties of wheat bread was investigated. The sourdough formula (100g soy flour, 130g of water (dough yield, 230), fermentation time of 30h) used exhibited angiotensin-I inhibitory activity and emulsifying properties in a recent study.The LAB count was adequate and similar for all samples after mixing and proofing stages, but increased (p<0.05) by one log cycle for SDLS30 compared to SDLP30. Dough development parameters were lowered (p<0.05) by sourdough addition especially the 30%. However, LAB strain used had no effect on these properties. A mixed tr...