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Influence of post‐harvest moisture on roasted almond shelf life and consumer acceptance
Author(s) -
Luo Kathleen K,
Chapman Dawn M,
Lerno Larry A,
Huang Guangwei,
Mitchell Alyson E
Publication year - 2020
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.10624
Subject(s) - nonanal , lipid oxidation , octanal , food science , shelf life , moisture , prunus dulcis , chemistry , hexanoic acid , flavor , cardboard , hexanal , waste management , horticulture , cultivar , organic chemistry , biology , antioxidant , engineering
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. © 2020 Society of Chemical Industry