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A novel approach for assuring and following inoculum activity during kefir grains growth studies : application of dynamic pH profilesTramšek, Marko ; Goršek, Andreja, 1961-The profiles of kefir grains growth curves strongly depend on bioprocess conditions and inoculum viability. Therefore, accurate growth curve studies require the use of optimally active kefir grains ... as inoculum. Accordingly, the main objective of our study was experimental optimization of classic kefir grains activation procedure and afterwards, comparison among growth curves of differently activated kefir grains. For this purpose some experiments were initially performed in computer-controlled RC1 reactor provided data of dynamic pH profiles during batch propagation of differently activated grains. Experimental data were mathematically analyzed and using the special methodology of minimizing the absolute deviation of pH(t) profiles the minimaltime for grains activation was determined. We established that optimal inoculum activity could be ensured only by the kefir grains, which were previously activated at least over eleven successive days. In the second part of research the growth curve of optimally activated kefir grains was constructed using experimental measurements and fitted with Gompertz model. The present results were compared with the results obtained by our previous study, where classically activated grains were used. We established that, inspite of equal daily kefir grain mass increase, considerable difference in growth curves of differently activated kefir grains exist.Source: Acta chimica slovenica. - ISSN 1318-0207 (Vol. 54, no. 4, 2007, str. 693-699)Type of material - article, component partPublish date - 2007Language - englishCOBISS.SI-ID - 11991062
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Tramšek, Marko | 25661 |
Goršek, Andreja, 1961- | 06008 |
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