Authors: Maria Hermann Kerstin Kronseder Jennifer Sorgend Tharalinee UaArak Rudi F Vogel
Publish Date: 2015/09/12
Volume: 242, Issue: 3, Pages: 337-344
Abstract
Water kefir is produced by a microbial consortium which is embedded into jelly crystals These microbiota and the sparkling sweet slightly alcoholic drink have been in the focus of interest This work showed that a foodgrade flourlike powder produced from the water kefir grains which we termed water kefir powder WKP possesses promising hydrocolloid properties which can be exploited in baking and beyond For WKP production grains were autoclaved lyophilized and milled to a particle size below 0025 mm WKP was homogeneous white to creamcoloured and had a dry matter of 9366 ± 007 It was not hygroscopic and could be stored in sealed plastic tins at room temperature WKP aroma can be described as mainly sour starchy acetic acidlike and fermented Aqueous solutions of WKP displayed a pH value of 38 Microscopic analysis of dry and wet WKP showed that it consisted of angular sharpedged particles whose angularity remained but size increased during soaking Furthermore WKP became translucent when it was wet whereby its waterholding capacity was not temperature dependent between room temperature 919 ± 039 and 75 °C 869 ± 041 Freezing experiments revealed a freeze–thaw stability of 950 ± 02 for 8 w/v WKP 968 ± 04 for 10 w/v WKP and 988 ± 04 for 12 w/v WKP Fatbinding capacity amounted 129 ± 022 No gelbuilding emulsifying or foamforming activity could be observed Adding 1 2 and 5 WKP to wheat breads leads to decreased crumb firmness after 0 and 48 h and therefore increased freshness and retarded staling No negative influence of WKP on smell and taste was found whereas no potential for sodium reduction by using WKP could be found in this workPart of this study was supported by funds of the innovation promotion programme of Bundesministerium für Ernährung Landwirtschaft und Verbraucherschutz BMELV through Bundesanstalt für Landwirtschaft und Ernährung BLE in Project 2816300107 We kindly thank Peter Köhler Markus Brunnbauer and Katharina Schiesser HansDieterBelitzInstitute for Cereal Grain Research Germany for helpful discussions and technical support with bread texture analyses
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