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ARS Home » Southeast Area » Raleigh, North Carolina » Market Quality and Handling Research » Research » Publications at this Location » Publication #197397


item Greene, Jeffrey
item Sanders, Timothy
item Drake, Maryanne

Submitted to: American Peanut Research and Education Society Abstracts
Publication Type: Other
Publication Acceptance Date: 7/9/2006
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: One of the most common off-flavors in peanuts is described as fruity fermented (FF). This off-flavor develops when peanuts are cured at excessive temperatures (>35ºC). The determination of FF intensity in large peanut lots is important to manufacturers who purchase peanuts. The distribution of FF intensity among samples from a peanut lot is critical to development of sampling plans that can be used to accurately identify this off-flavor. The objective of this study was to determine the distribution of fruity fermented off-flavor among samples from large peanut lots. Twenty medium grade-size, runner-type peanut lots identified by a single sample as having FF flavor were sampled. Peanut samples from each lot were randomized and divided into twenty, 680 g sub-samples. The peanuts were roasted for 12 minutes at 177°C using a lab-scale roaster and processed into paste for evaluation by a trained descriptive panel. There were significant (P<0.05) differences noted among the 20 peanut lots and within a single lot. The distribution of FF intensity for the 20 sub-samples in a peanut lot varied. The FF means identified using the descriptive panel did not correlate to the original single sample FF intensity. Variation among the twenty lots, sub-samples from a single lot, and the low correlation with the original single sample FF intensity demonstrate the need to develop a sampling plan to reduce good lots being rejected and bad lots being accepted.