Journal article
Dropping macadamia nuts-in-shell reduces kernel roasting quality
Journal of the Science of Food and Agriculture, Vol.90(13), pp.2163-2167
2010
Abstract
BACKGROUND: Macadamia nuts ('nuts-in-shell') are subjected to many impacts from dropping during postharvest handling, resulting in damage to the raw kernel. The effect of dropping on roasted kernel quality is unknown. Macadamia nuts-in-shell were dropped in various combinations of moisture content, number of drops and receiving surface in three experiments. After dropping, samples from each treatment and undropped controls were dry oven-roasted for 20 min at 130 â—¦C, and kernels were assessed for colour, mottled colour and surface damage. RESULTS: Dropping nuts-in-shell onto a bed of nuts-in-shell at 3% moisture content or 20% moisture content increased the percentage of dark roasted kernels. Kernels from nuts dropped first at 20%, then 10% moisture content, onto a metal plate had increased mottled colour. Dropping nuts-in-shell at 3% moisture content onto nuts-in-shell significantly increased surface damage. Similarly, surface damage increased for kernels dropped onto a metal plate at 20%, then at 10% moisture content. CONCLUSION: Postharvest dropping of macadamia nuts-in-shell causes concealed cellular damage to kernels, the effects not evident until roasting. This damage provides the reagents needed for non-enzymatic browning reactions. Improvements in handling, such as reducing the number of drops and improving handling equipment, will reduce cellular damage and after-roast darkening.
Details
- Title
- Dropping macadamia nuts-in-shell reduces kernel roasting quality
- Authors
- David Walton (Author) - University of the Sunshine Coast - Faculty of Science, Health and EducationHelen M Wallace (Author) - University of the Sunshine Coast - Faculty of Science, Health and Education
- Publication details
- Journal of the Science of Food and Agriculture, Vol.90(13), pp.2163-2167
- Publisher
- John Wiley & Sons Ltd.
- Date published
- 2010
- DOI
- 10.1002/jsfa.4063
- ISSN
- 0022-5142
- Organisation Unit
- School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland
- Language
- English
- Record Identifier
- 99450029302621
- Output Type
- Journal article
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- Web Of Science research areas
- Agriculture, Multidisciplinary
- Chemistry, Applied
- Food Science & Technology
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