Effects of rough rice storage in different packages, storage temperature and periods on qualities of parboiled germinated rice
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Abstract
This study was conducted to investigate effects of rough rice storage in different packages,
storage temperatures and periods on qualities of parboiled germinated rice (PGR). Moisture content of
rough rice averagely was 14.25% (dry basis). The experiment design was 3x3x3 factorial in completely
randomized design (CRD). The factors of this experiment were types of packages, including woven
polypropylene (WPP) bag, SuperGrainBagsTM(SGB) and aluminium laminated bag (Al/PE) having a size
of 17.5 cm X 28 cm into which 500 g rice was packaged, storage temperatures (25, 35 and 45ºC) and
storage periods (30, 90, and 180 days). The results showed that gaseous concentrations measured in
WPP bags were not different from those measured in an ambient air. Whilst those measured in SGB and
Al/PE bags were modified from ambient condition i.e. decreased O2 and increased CO2 concentrations.
Although germination percentages of rough rice packaged in WPP kept at all temperatures became
slightly decreased, those of rough rice packaged in SGB and Al/PE bags kept at 35ºC and 45ºC were
significantly decreased. The Al/PE treatment showed the highest rate of germination reduction. Rough rice
packaged in SGB and Al/PE bags kept at high temperatures subsequently caused increases in a* and b*
values of PGR especially kept in Al/PE of which the values measured during the storage period nearly
doubled those measured on Day 0. Furthermore an average hº value of such PGR decreased from 84º to
76º indicating that PGR became darker. Hardness of cooked PGR was increased by storage periods of
rough rice, particularly the samples in SGB and Al/PE bags kept at 35ºC and 45ºC. The cooked PGR from
WPP had the lowest hardness value. The γ--amino-butyric acid (GABA) content of PGR continuously
decrease, during storage in particular those of PGR from SGB and Al/PE kept at 35ºC and 45ºC.
The present research highlights that packaging type and storage conditions (temperature and period) of
rough rice significantly affect quality of PGR. It can be concluded that rough rice storage in WPP kept
at 25ºC and 35ºC within 90 days is considered for the suitable conditions to keep rough rice for PGR
processing.
Article Details
King Mongkut's Agricultural Journal
References
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