Agricultural Communications Documentation Center, Funk Library, University of Illinois Box: 207 Document Number: D13037
Notes:
6 pages, Kefirs are fermented beverages containing yeast and bacteria produced by the fermentation of water or milk with kefir grains. Because microorganism density may influence a product's health benefits, label accuracy regarding viable bacterial density and taxonomy of fermented foods is important. In this study, the microbiota of 5 commercial kefir products were measured quantitatively using standard plating techniques and characterized using high-resolution, long-read 16S rRNA gene amplicon sequencing. To enumerate viable lactic acid bacteria, 2 lots of each product were plated on de Man, Rogosa and Sharpe agar upon opening and following 14 d and incubated under anaerobic and aerobic conditions. Results revealed that 66% of products with a guaranteed count of colony-forming units per gram overstated microorganism density by at least 1 log, with only product E exceeding 1 × 109 cfu/g. Sequencing results demonstrated moderate product label accuracy in regard to taxonomy, yet several products contained bacterial species above the minimum detectable threshold (0.001% relative abundance) that were not included on the labels (e.g., Streptococcus salivarius, Lactobacillus paracasei). Our results demonstrate a moderate level of labeling accuracy for commercial kefir products intended for human consumption. Regulatory agencies and consumers must continue to scrutinize these products and demand a higher level of accuracy and quality.
Huysveld, Sophie (author), Van Meensel, Jef (author), Van linden, Veerle (author), De Meester, Steven (author), Peiren, Nico (author), Muylle, Hilde (author), Dewulf, Jo (author), and Lauwers, Ludwig (author)
Format:
Journal article
Publication Date:
2017-01
Published:
Belgium: Elsevier
Location:
Agricultural Communications Documentation Center, Funk Library, University of Illinois Box: 161 Document Number: D07798
Agricultural Communications Documentation Center, Funk Library, University of Illinois Document Number: D08826
Notes:
Pages 1025-1044 in Rob Roggema (ed.), Agriculture in an urbanizing society volume two: proceedings of the sixth AESOP conference on sustainable food planning. United Kingdom: Cambridge Scholars Publishing. Pages 601-1274.
