| Title: | Influence of post-harvest moisture on roasted almond shelf life and consumer acceptance |
| Author(s): | Luo KK; Chapman DM; Lerno LA; Huang G; Mitchell AE; |
| Address: | "Department of Food Science and Technology, University of California, Davis, Davis, CA, USA. The National Food Lab Inc., Livermore, CA, USA. Food Safety and Measurement Facility, University of California, Davis, Davis, CA, USA. Almond Board of California, Modesto, CA, USA" |
| ISSN/ISBN: | 1097-0010 (Electronic) 0022-5142 (Linking) |
| Abstract: | "BACKGROUND: The harvest weights of sweet almonds (Prunus dulcis) have significantly increased to meet consumer demand and now exceed processing facility capabilities. Crops are stockpiled for longer periods, increasing the probability of moisture exposure. Wet almonds can be mechanically dried prior to processing; however, it is unclear how this practice influences lipid oxidation, shelf-life, and consumer acceptance. To address this, almonds were exposed to 8% moisture and dried with low heat (ME). Almonds were roasted and stored under accelerated conditions for 12 months and markers of lipid oxidation, headspace volatiles, sensory attributes, and consumer liking were evaluated. RESULTS: At 7 months of storage, light roast ME almonds had higher levels of volatiles related to lipid oxidation than non-moisture exposed almonds (NME) and were significantly higher in oxidized, cardboard and painty / solvent flavors. Although untrained consumers did not show significant preferences between the light roast ME and NME almonds, there were quality losses related to lipid oxidation that trained panelists could detect. Dark roast ME almonds demonstrated significant lipid oxidation by 5 months of storage, indicating they will have a compromised shelf life. Findings also indicate that octanal, nonanal, 2-octenal, and hexanoic acid are good indicators of consumer acceptability. CONCLUSION: The results of this research illustrate that post-harvest moisture exposure with mechanical drying has a significant effect on the storage quality of roasted almonds and is most pronounced in dark roast products. (c) 2020 Society of Chemical Industry" |
| Keywords: | Consumer Behavior Cooking Food Storage Hot Temperature Humans Lipids/chemistry Nuts/*chemistry Oxidation-Reduction Prunus dulcis/*chemistry Taste Volatile Organic Compounds/chemistry Water/analysis Hs-spme gc/ms almond descriptive analysis moisture sensor; |
| Notes: | "MedlineLuo, Kathleen K Chapman, Dawn M Lerno, Larry A Huang, Guangwei Mitchell, Alyson E eng Almond Board of California/ England 2020/07/03 J Sci Food Agric. 2021 Jan 15; 101(1):139-150. doi: 10.1002/jsfa.10624. Epub 2020 Jul 28" |
