Abstract
BACKGROUND: Aroma of fragrant rice greatly affects palatability as well as consumer acceptability. Loss of desirable volatile compounds such as 2-acetyl-1-pyrroline (2-AP) and increase in volatile lipid oxidation products in aged rice have been reported. The aim of this study was to monitor the changes in key volatile compounds of organic red fragrant rice cv. Hom Daeng during storage. Effects of packaging material, storage temperature and time were evaluated using solid phase microextraction/gas chromatography/mass spectrometry. RESULTS: Thirteen key volatile compounds including ten lipid oxidation products were monitored. For samples vacuum packed in Nylon/LLDPE pouches at ambient temperature, significant increases in hexanal, 2-pentylfuran, 1-octanol and 4-vinyl guaiacol and significant decreases in 2-AP and geranyl acetone were found after the second month (P< or =0.05). Vacuum packing in OPP/Al/LLDPE pouches or storage at 15 degrees C better retarded the formation of volatile lipid oxidation products and greater retained desirable odorants, including 2-AP. However, accumulation of lipid oxidation products and 4-vinyl guaiacol was apparent after the sixth month under these storage conditions. CONCLUSION: A greater extent and higher rate of undesirable changes in volatile compounds were found in samples stored under Nylon/LLDPE/ambient temperature condition. Nevertheless, this condition is acceptable for the retail trade of organic rice in Thailand. Storage conditions using reduced temperature or better packaging materials may be more appropriate for exported rice or superior-grade fragrant rice to better maintain the desirable rice aroma.
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Claims 9
Claim · model-written summary
Hexanal, 2-pentylfuran and 1-octanol increased after two months.
- Taxon
- rice
Oryza sativat0 - Treatment
- vacuum packed in Nylon/LLDPE pouches at ambient temperaturee0
- Outcome
- hexanal, 2-pentylfuran, 1-octanole0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For samples vacuum packed in Nylon/LLDPE pouches at ambient temperature, significant increases in hexanal, 2-pentylfuran, 1-octanol and 4-vinyl guaiacol and significant decreases in 2-AP and geranyl acetone were found after the second month”
t0“rice”
Claim · model-written summary
4-vinyl guaiacol increased after two months.
- Taxon
- riceOryza sativat0
- Treatment
- vacuum packed in Nylon/LLDPE pouches at ambient temperaturee0
- Outcome
- 4-vinyl guaiacole0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For samples vacuum packed in Nylon/LLDPE pouches at ambient temperature, significant increases in hexanal, 2-pentylfuran, 1-octanol and 4-vinyl guaiacol and significant decreases in 2-AP and geranyl acetone were found after the second month”
t0“rice”
Claim · model-written summary
2-AP and geranyl acetone decreased after two months.
- Taxon
- riceOryza sativat0
- Treatment
- vacuum packed in Nylon/LLDPE pouches at ambient temperaturee0
- Outcome
- 2-AP and geranyl acetonee0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For samples vacuum packed in Nylon/LLDPE pouches at ambient temperature, significant increases in hexanal, 2-pentylfuran, 1-octanol and 4-vinyl guaiacol and significant decreases in 2-AP and geranyl acetone were found after the second month”
t0“rice”
Claim · model-written summary
OPP/Al/LLDPE packaging better retarded lipid oxidation products.
- Taxon
- riceOryza sativat0
- Treatment
- Vacuum packing in OPP/Al/LLDPE pouchese0
- Outcome
- formation of volatile lipid oxidation productse0
- Direction
- better retardede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vacuum packing in OPP/Al/LLDPE pouches or storage at 15 degrees C better retarded the formation of volatile lipid oxidation products and greater retained desirable odorants, including 2-AP”
t0“rice”
Claim · model-written summary
Storage at 15 degrees C better retarded lipid oxidation products.
- Taxon
- riceOryza sativat0
- Treatment
- storage at 15 degrees Ce0
- Outcome
- formation of volatile lipid oxidation productse0
- Direction
- better retardede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vacuum packing in OPP/Al/LLDPE pouches or storage at 15 degrees C better retarded the formation of volatile lipid oxidation products and greater retained desirable odorants, including 2-AP”
t0“rice”
Claim · model-written summary
Lipid oxidation products and 4-vinyl guaiacol accumulated after month six.
- Taxon
- riceOryza sativat0
- Outcome
- accumulation of lipid oxidation products and 4-vinyl guaiacole0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“accumulation of lipid oxidation products and 4-vinyl guaiacol was apparent after the sixth month under these storage conditions”
t0“rice”
Claim · model-written summary
Nylon/LLDPE ambient storage gave faster undesirable volatile changes.
- Taxon
- riceOryza sativat0
- Treatment
- Nylon/LLDPE/ambient temperature conditione0
- Outcome
- undesirable changes in volatile compoundse0
- Direction
- higher ratee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A greater extent and higher rate of undesirable changes in volatile compounds were found in samples stored under Nylon/LLDPE/ambient temperature condition”
t0“rice”
Claim · model-written summary
The authors consider this condition acceptable for Thai retail rice.
Verbatim
e0“this condition is acceptable for the retail trade of organic rice in Thailand”
Claim · model-written summary
Reduced temperature or better packaging is recommended for exported or superior grade rice.
- Taxon
- riceOryza sativae0
- Outcome
- Storage conditions using reduced temperature or better packaging materialse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Storage conditions using reduced temperature or better packaging materials may be more appropriate for exported rice or superior-grade fragrant rice to better maintain the desirable rice aroma”
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See all 14 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.