Did some research over the week and i found out that peanut butter has a water activity of 0.7.
and peanut butter is an INTERMEDIATE MOISTURE FOOD as its water activity of 0.7 falls into the IMF range of 0.6 to 0.85.
References:
Department of Health, education and welfare public health service. Food and drug Adminstration. Water activity in food. Available online: http://www.fda.gov/ora/inspect_ref/itg/itg39.html (accessed: 24 April 2008)
Smith D. Stratton J.Understanding GMPs for sauces and dressings. Food processing for entrepreneurs series. Available online: http://www.ianrpubs.unl.edu/epublic/live/g1599/build/g1599.pdf (accessed: 24 April 2008)
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