Effects of soaking and thermal treatment on nutritional quality of three varieties of common beans ( Phaseolus vulgaris L .) from Madagascar

International audienceThe aim of this study was to evaluate the effects of soaking and thermal treatment on proteins, anthocyanins, α-galactosides (stachyose, raffinose), tannins and inositol hexaphosphate (IP6), under different conditions, of three Phaseolus vulgaris L. varieties from Madagascar; and evaluate correlation with surface/volume ratio. Overall, dry matter, antinutrients and anthocyanins were impacted by the process, however proteins were not. Depending on varieties and operating conditions, soaking or thermal treatment led to up to 59% losses for dry matter, 73% for tannins, 99% for IP6, 92% for total α-galactosides and 100% for anthocyanins. In certain cases, the process increased dry basis concentration of α-galactosides probably through hydrolysis phenomena from precursors. A positive correlation between the surface/volume ratio of common beans and decrease of tannins and α-galactosides was highlighted. A global antinutritional indicator was used along with the dry matter to evaluate the best conditions to subside all antinutrients and limit the loss of nutrients, combining soaking and thermal treatment. These conditions were soaking (30 C) for 1 h followed by heat treatment at 65 C with 1/5 seed-to-water ratio during 2 h. Appropriate soaking/thermal treatment of common dry bean is crucial to reduce antinutrients and limit nutrient loss. Novelty Impact Statement Common bean (Phaseolus vulgaris L.) contains antinutrients and oligosaccharides which causes digestive discomfort. Suitable soaking and thermal treatments reduce these compounds and limit the loss of nutrients. As a final product, a common bean partially free of negative compounds could help in processing common beans and be employed as an ingredient in derived product

Training beneficiaries in the PABRA Project

Pan African Bean Research Alliance (PABRA) specifically invests finance, human resource and time in ensuring that the continents bean researchers and staff are up to date and relevant with skills they require. The data sets presented here have been assembled from multiple sources to provide and indicative position of skill and knowledge building initiatives by PABRA and its various partners. The data sets show the number of people trained between the year 2003 t0 2016. Though the data sets provide the numbers, discussion on capacity building as a whole is available in the capacity building section of the PABRA website

Training beneficiaries in the PABRA Project

Pan African Bean Research Alliance (PABRA) specifically invests finance, human resource and time in ensuring that the continents bean researchers and staff are up to date and relevant with skills they require. The data sets presented here have been assembled from multiple sources to provide and indicative position of skill and knowledge building initiatives by PABRA and its various partners. The data sets show the number of people trained between the year 2003 t0 2016. Though the data sets provide the numbers, discussion on capacity building as a whole is available in the capacity building section of the PABRA website