Near Infrared (NIR) Analysis was applied to assess its potential for measuring water activity (aw) and moisture in California Seedless Raisins in moisture equilibrium and nonequilibrium conditions. Samples covered a wide range of anticipated moisture contents. an NIR calibration for aw was made for whole raisins that were fully equilibrated. For ground raisins, NIR calibrations were made both aw and vacuum oven moisture, covering a large range of moisture contents and equilibrium conditions. Direct measurement of aw by a dewpoint device gave highly repeatable results, especially for ground raisins. Vacuum oven analysis of moisture was less precise than aw measurements. Full spectrum NIR calibrations indicated that NIR could predict aw of raisins in ground form, irrespective of their state of hydration beyond three hours following processing. A much larger sample population will be needed to establish precise calibrations for vacuum oven moisture.
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C.C. Huxsoll (2000) studied this question.
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