Summary
This paper by López et al., published in the Journal of Agricultural and Food Chemistry in 2001, investigates the capacity of sourdough fermentation to degrade phytic acid in cereal products. Phytic acid is an antinutrient that chelates divalent minerals and reduces their intestinal absorption, so its reduction through fermentation has significant nutritional implications. The study likely demonstrates that lactic acid bacterial fermentation activates endogenous cereal phytases, substantially reducing phytate levels and thereby improving the potential bioavailability of minerals such as iron and zinc.
UK applicability
Although the study was likely conducted in a French laboratory context, its findings are directly applicable to UK food and nutrition policy, particularly given growing interest in traditional fermentation methods and the nutritional quality of bread. UK consumers and food producers interested in sourdough as a health-promoting alternative to conventional bread would find this evidence relevant.
Key measures
Phytate concentration (mg/g or % reduction); mineral bioavailability indicators; phytase activity; possibly in vitro mineral solubility
Outcomes reported
The study measured the extent to which sourdough fermentation reduces phytate content in wheat or rye-based products, and likely assessed the consequent effects on mineral bioavailability (e.g. iron, zinc, calcium). Phytase activity during lactic acid fermentation was a probable focus.
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