Soybean Whey Enhance Mineral Balance and Caecal Fermentation in Rats

Overview

Journal Eur J Nutr

Specialty Nutritional Sciences

Date 2009 Oct 16

PMID 19830378

Citations 10

Authors

Maria Dolores Tenorio

Irene Espinosa-Martos

Guadalupe Prestamo

Pilar Ruperez

Affiliations

Soon will be listed here.

Abstract

Background: Soybean whey, a by-product of tofu manufacturing, is currently discarded by the food industry. However, it contains valuable compounds such as non-digestible oligosaccharides (NDO), which promote the growth of beneficial lactic acid bacteria in the colon, and are therefore recognized as prebiotics. Acidic fermentation of NDO in the caecum appears to be related with an increase in mineral absorption.

Aim Of The Study: To evaluate the effect of consuming soybean whey containing galacto-oligosaccharides (GOS) on mineral absorption and caecal fermentation in rats.

Methods: An in vivo assay was carried out in rats over a period of 4 weeks; previously, the nutritional composition of soybean whey was determined and NDO were measured by high-performance liquid chromatography (HPLC). Faeces and urine were collected weekly throughout the experiment for mineral balance analyses. Animals were killed under anaesthesia, organs were removed and weighed, and short-chain fatty acids in the caecal contents were determined by gas chromatography.

Results And Conclusions: Non-digestible carbohydrates such as GOS stachyose (318 +/- 3 mg/100 mL) and traces of inulin were identified by HPLC. When soybean whey was used as a source of GOS in rats, the consumption of diluted soybean whey (75 mL/day per rat) containing GOS (120 mg/day per rat) exhibited a prebiotic effect and led to an improved mineral balance, especially for calcium and magnesium. In view of its composition and potential health-promoting properties, soybean whey could be used as a valuable ingredient in new functional foods.

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