USDA Grant No. 93-37500-9252 and Massachusetts Agricultural Experiment Station MAS000709. Access to NMR facility under Chemistry and Polymer Science and Engineering is acknowledged. Special thanks to Dr. L.C. Dickinson for continuous technical advice.
Growth of Staphylococcus aureus as Related to 17O NMR Water Mobility and Water Activity
Version of Record online: 20 JUL 2006
Journal of Food Science
Volume 62, Issue 4, pages 861–866, July 1997
How to Cite
LAVOIE, J.P., LABBE, R.G. and CHINACHOTI, P. (1997), Growth of Staphylococcus aureus as Related to 17O NMR Water Mobility and Water Activity. Journal of Food Science, 62: 861–866. doi: 10.1111/j.1365-2621.1997.tb15473.x
- Issue online: 20 JUL 2006
- Version of Record online: 20 JUL 2006
- Ms received 6/10/96; revised 1/27/97; accepted 3/14/97.
- Staphylococcus aureus;
- water activity;
- water mobility
17O NMR data were determined for three solute-BHI (Brain Heart Infusion) mixtures. For each solute, NaCl, raffinose and glycerol, NMR data (linewidths and signal intensity) were determined as well as water activity (aw), moisture contents, and effects on growth of Staphylococcus aureus in media of various moisture contents. Liquid (highly mobile) water content in all media tested was determined by NMR. This mobile water was important and had a stronger correlation with S. aureus growth rate than did aw or moisture content, although solute effects limited empirical prediction. NMR linewidth also correlated with lag phase.