Butler, James R.A. (author), Darbas, Toni (author), Addison, Jane (author), Bohensky, Erin L. (author), Carter, Lucy (author), Cosijn, Michaela (author), Maru, Yiheyis T. (author), Stone-Jovicich, Samantha (author), Williams, Liana J. (author), and Rodriguez, Luis C. (author)
Format:
Book chapter
Publication Date:
2017
Published:
International: CSIRO Publishing, Clayton South, Victoria, Australia
Location:
Agricultural Communications Documentation Center, Funk Library, University of Illinois Box: 18 Document Number: D10513
Notes:
217 pages., Pages 109-129 in Heinz Schandl and Lain Walker (eds.), Social science and sustainability. CSIRO Publishing, Clayton South, Victoria,Australia. 2017. 217 pages.
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.
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.
