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Quality Characteristics of Novel Sourdough Breads Made with Functional SP5 and Prebiotic Food Matrices

Overview
Journal Foods
Specialty Biotechnology
Date 2023 Jul 11
PMID 37430975
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Abstract

SP5, isolated from kefir, was assessed as a starter culture for sourdough bread making in freeze-dried form, both free (BSP5 bread) and immobilised on wheat bran (BIWB) and on a traditional flour/sour milk food, 'trahanas' (BITR). Physicochemical characteristics, shelf-life, volatilome, phytic acid, and sensory properties of the breads were evaluated. The BITR breads had higher acidity (9.05 ± 0.14 mL of 0.1 M NaOH/10 g) and organic acid content (g/Kg; 2.90 ± 0.05 lactic, 1.04 ± 0.02 acetic), which justifies the better resistance against mould and rope spoilage (>10 days). The highest number of volatiles (35) and at higher concentration (11.14 μg/g) were also found in BITR, which is in line with the sensory (consumer) evaluation regarding flavour. Finally, higher reduction of phytate (an antinutrient) was observed in all SP5 sourdoughs (83.3-90.7%) compared to the control samples (71.4%). The results support the use of the new strain for good quality sourdough bread.

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