Kim, Jeong-Il;Choi, Hae-Chun;Kim, Kwang-Ho;Ahn, Jong-Kuk;Park, No-Bong;Park, Dong-Soo;Kim, Chun-Song;Lee, Ji-Yoon;Kim, Jae-Kyu
KOREAN JOURNAL OF CROP SCIENCE
/
v.54
no.1
/
pp.13-23
/
2009
To intensively analyze and examine the changes in palatability of cooked rice and structural properties of rice grains influenced by increased nitrogen topdressing during the panicle formation and ripening stage, a series of experiments were carried out using three japonica rice cultivars with contrasting rice quality characteristics. The protein content of brown rice increased maximally up to $35{\sim}47%$ of that in standard N6 plot with the increase in nitrogen topdressing fertilizer during 20 days before heading to 10 days after flowering. The high-yielding rice cultivars showing poor palatability of cooked rice revealed larger increase in protein content of rice grains by increased nitrogen topdressing. Under the same nitrogen level of 15 kg per 10a with nitrogen topdressing at 3 kg/10a, high-yielding rice cultivars, Yumehikari and Reihou showed the significant increase in protein content of brown rice when topdressing was applied at 10 days after flowering as compared with when it was applied at 30 days after transplanting. Although the variation in amylose content of milled rice as affected by nitrogen topdressing level was relatively small, it decreased within 1% with the opposite tendency against increased protein content of brown rice by increased nitrogen topdressing. The total score of sensory evaluation was higher in the order of Hinohikari < Yumehikari < Reihou in panel test. It decreased significantly by increased amounts of nitrogen topdressing during 20 days before heading to 10 days after flowering when nitrogen level was higher than 12 kg/10a. The more poor palatable rice cultivar in panel test revealed the larger decreasing in total score of sensory evaluation by higher nitrogen topdressing rates. All sensory evaluation components were largely affected by the change in protein content of brown rice rather than amylose content of milled rice. The influence of protein content to palatability of cooked rice was larger in poor-palatable rice than in high-palatable rice. The protein content decreased drastically from outer layer to inner layer of rice grains, while the amylose content increased on the contrary. The high-palatable rice exhibited higher distribution of protein content on bran layer but lower distribution of protein content on the layer of polished rice as compared with the poor-palatable rice. Especially, the high-palatable rice showed also significantly lower distribution of amylose content on the outer layer of polished rice as compared with the poor-palatable rice.
We carried out this experiment on the purpose to investigate the quality properties of aseptic-packaged cooked rice by cultivars in 2006. Brown rice was milled for white rice to 89.6% weight of it. Based on cluster analysis of acceptance of sensory evaluation, eleven rice cultivars of 29 cultivars had superior palatability. Whiteness(r=0.42, p<5%), lightness(r=0.39, p<5%), Toyo value(r=0.35, p<10%), and moisture content(r=0.33, p<10%) of milled rice were correlated positively with acceptability. Protein content(r=-0.40, p<5%), expansion rate(r=-0.68, p<1%) and water absorption rate(r=-0.42, p<5%) of milled rice, and yellowness(r=-0.45, p<5%) of aseptic-packaged cooked rice were negatively correlated. In sensory evaluation, correlation coefficients of taste and texture with acceptability were higher than those of appearance and flavor. During storage, hardness and cohesiveness of aseptic-packaged cooked rice before reheating were increased and decreased, but those after reheating had no difference based on storage period and cultivar. On the contrary, whiteness of reheated aseptic-packaged cooked rice with no distinct differences before reheating was decreased during storage. There were no significant differences of texture property, color characteristics and moisture contents by cultivar during storage.
With a view to improving the method of rice marketing quality estimation, vaietal milling characteristics and apparent qualities were studied and their statistical interrelationships were computed for 2 years crops, using 22 varieties of Japonica type and Japonica x Indica type (Tongil). The milling yield was the highest for Japonica, while the broken rice yields was the highest for Japa.xInd. type. But bran yield did not show any significant differences among rice types. Milling factors were volume weight of brown rice, dehulling yield, and Polishing yields; the better these factors, the higher the yield. High apparent quality milled rice with high milling yield were produced from rice types whose broken rice, chalked rice, husk yield and bran yield were little and/or low.
The endeavors enhancing the grain quality of high-yielding japonica rice were steadily continued during 1980s-1990s along with the self-sufficiency of rice production and the increasing demands of high-quality rices. During this time, considerably great progress and success was obtained in development of high-quality japonica cultivars and quality evaluation techniques including the elucidation of interrelationship between the physicochemical properties of rice grain and the physical or palatability components of cooked rice. In 1990s, some high-quality japonica rice cultivars and special rices adaptable for food processing such as large kernel, chalky endosperm, aromatic and colored rices were developed and its objective preference and utility was also examined by a palatability meter, rapid-visco analyzer and texture analyzer, Recently, new special rices such as extremely low-amylose dull or opaque non-glutinous endosperm mutants were developed. Also, a high-lysine rice variety was developed for higher nutritional utility. The water uptake rate and the maximum water absorption ratio showed significantly negative correlations with the K/Mg ratio and alkali digestion value(ADV) of milled rice. The rice materials showing the higher amount of hot water absorption exhibited the larger volume expansion of cooked rice. The harder rices with lower moisture content revealed the higher rate of water uptake at twenty minutes after soaking and the higher ratio of maximum water uptake under the room temperature condition. These water uptake characteristics were not associated with the protein and amylose contents of milled rice and the palatability of cooked rice. The water/rice ratio (in w/w basis) for optimum cooking was averaged to 1.52 in dry milled rices (12% wet basis) with varietal range from 1.45 to 1.61 and the expansion ratio of milled rice after proper boiling was average to 2.63(in v/v basis). The major physicochemical components of rice grain associated with the palatability of cooked rice were examined using japonica rice materials showing narrow varietal variation in grain size and shape, alkali digestibility, gel consistency, amylose and protein contents, but considerable difference in appearance and texture of cooked rice. The glossiness or gross palatability score of cooked rice were closely associated with the peak, hot paste and consistency viscosities of viscosities with year difference. The high-quality rice variety "IIpumbyeo" showed less portion of amylose on the outer layer of milled rice grain and less and slower change in iodine blue value of extracted paste during twenty minutes of boiling. This highly palatable rice also exhibited very fine net structure in outer layer and fine-spongy and well-swollen shape of gelatinized starch granules in inner layer and core of cooked rice kernel compared with the poor palatable rice through image of scanning electronic microscope. Gross sensory score of cooked rice could be estimated by multiple linear regression formula, deduced from relationship between rice quality components mentioned above and eating quality of cooked rice, with high probability of determination. The $\alpha$-amylose-iodine method was adopted for checking the varietal difference in retrogradation of cooked rice. The rice cultivars revealing the relatively slow retrogradation in aged cooked rice were IIpumbyeo, Chucheongyeo, Sasanishiki, Jinbubyeo and Koshihikari. A Tonsil-type rice, Taebaegbyeo, and a japonica cultivar, Seomjinbyeo, showed the relatively fast deterioration of cooked rice. Generally, the better rice cultivars in eating quality of cooked rice showed less retrogradation and much sponginess in cooled cooked rice. Also, the rice varieties exhibiting less retrogradation in cooled cooked rice revealed higher hot viscosity and lower cool viscosity of rice flour in amylogram. The sponginess of cooled cooked rice was closely associated with magnesium content and volume expansion of cooked rice. The hardness-changed ratio of cooked rice by cooling was negatively correlated with solids amount extracted during boiling and volume expansion of cooked rice. The major physicochemical properties of rice grain closely related to the palatability of cooked rice may be directly or indirectly associated with the retrogradation characteristics of cooked rice. The softer gel consistency and lower amylose content in milled rice revealed the higher ratio of popped rice and larger bulk density of popping. The stronger hardness of rice grain showed relatively higher ratio of popping and the more chalky or less translucent rice exhibited the lower ratio of intact popped brown rice. The potassium and magnesium contents of milled rice were negatively associated with gross score of noodle making mixed with wheat flour in half and the better rice for noodle making revealed relatively less amount of solid extraction during boiling. The more volume expansion of batters for making brown rice bread resulted the better loaf formation and more springiness in rice breed. The higher protein rices produced relatively the more moist white rice bread. The springiness of rice bread was also significantly correlated with high amylose content and hard gel consistency. The completely chalky and large grain rices showed better suitability far fermentation and brewing. The glutinous rice were classified into nine different varietal groups based on various physicochemical and structural characteristics of endosperm. There was some close associations among these grain properties and large varietal difference in suitability to various traditional food processing. Our breeding efforts on improvement of rice quality for high palatability and processing utility or value-adding products in the future should focus on not only continuous enhancement of marketing and eating qualities but also the diversification in morphological, physicochemical and nutritional characteristics of rice grain suitable for processing various value-added rice foods.ice foods.
Kim, Woo-Jae;Park, Hyun-Su;Chun, Jae-Beom;Kim, Hyun-Soon;Kang, Kyung-Ho;Jeong, Ji-Ung;Ko, Jae-Kwon;Kim, Bo-Kyeong
Proceedings of the Korean Society of Crop Science Conference
/
2017.06a
/
pp.265-265
/
2017
This study was carried out to develop rice variety integrated with rice bacterial blight resistance gene and to know the information of major agronomic traits of developed variety. Advanced backcross Lines 21 having Xa3 and Xa21 gene cross from japonica cultivar Hwanggeumnuri and indica variety IRBB21. Days after seeding and culm length of ABLs21 were 108 days (Aug. 16) and 76 cm, respectively. Ripened grain rates was 87.4 %, which was similar to the parents. 1000 grain weight of brown rice of ABLs21 was 21.4g, which was lower than the donor parent. Milled rice yield of ABLs21 was 532 kg/10a, which was smaller than recurrent parent and higher than the donor parent. Grain length/width ratio of brown rice was form of japonica with short-ellipse and glossiness of cooked rice has japonica trait. Head rice rate showed a large difference compare to the donor parent and similar to the recurrent parent. ABLs21 would be useful genetic resources for resistance breeding program against bacterial blight.
Kim, Hong-Yeol;Yang, Chang-Ihn;Choi, Yong-Hwan;Won, Yong-Jae;Lee, Young-Tae
KOREAN JOURNAL OF CROP SCIENCE
/
v.52
no.4
/
pp.375-379
/
2007
This study was carried out to examine the effects of storage duration on physico-chemical properties of milled rice. Rough rice of three rice ecotypes(Japonica, Tongil and F1 hybrids with Tongil back-ground) was stored for 4, 16, 28 and 40 months without artificial environmental control in seed warehouse. And this materials were investigated for seed germination rate, brown rice hardness, alkali digestion value(ADV), contents of protein, amylose, total sugar, and reducing sugar. Seed germination rate was significantly reduced with storage duration increased regardless of rice ecotypes : 66.7% from 16 months storage, 2.5% from 28, and nil from 40 months storage in Japonica rices. And 54.0%, 67.9% in Tongil, and F1 hybrid after 40 months storage, respectively. Brown rice hardness was not significantly affected by storage duration but showed significant genotypic differences. As the storage duration prolonged, sugar content and alkali digestion value increased, protein content declined while amylose content did not show clear tendency. Total and reducing sugar contents showed sharp increase upto 16 months storage and thereafter steady in crease, and the percentage of reducing sugar content out of total sugar content increased with extended storage duration.
Journal of the Korean Society of Food Science and Nutrition
/
v.40
no.4
/
pp.613-617
/
2011
This study was conducted to compare the quality of the brown rice (BR) and milled rice (MR) during storage. To assess quality, BR and MR were analysed by their fat acidity and flavor pattern using a SMart Nose$^{(R)}$. BR was stored for 30 days at $30^{\circ}C$, and analysed after 5, 15, 20, and 30 days of storage. MR produced in 2005, 2009, and 2010 were also tested. The fat acidity of both rice groups was increased with extended storage and the fat acidity of BR was more rapidly increased than that of MR in general. The flavor patterns from the SMart Nose$^{(R)}$ results were analyzed by the principal component analysis (PCA). The major groups of atomic mass unit (amu) for good discrimination contribution were from 41 to 85 amus. The PCA1 and PCA2 of BR were 95.64% and 2.78%, respectively when the samples were categorized by storage period. The PCA1 and PCA2 of MR were 81.18% and 13.85%, respectively when the samples were compared by production year. Both rice groups could be practically differentiated into flavor patterns by volatile properties for storage period. With regard to the correlation between fat acidity and flavor pattern, we could find that increasing storage period increased fat acidity value and changed flavor pattern from SMart Nose$^{(R)}$. Accordingly, SMart Nose$^{(R)}$ could be successfully used for easy screening and quality evaluation of stored rice.
To evaluate the characters related to rice grain quality as affected by silicate application, the ripened color, appearence and physicochemical properties of rice grain which were produced at the silt-loam paddy field of National Yeongnam Agricultural Exeperiment Station with a little poor drainage for trials on long-term effects of continuous application of same fertilizer were analyzed comparing with the NPK fertilizer an the NPK+compost in 1995. The whiteness value and color space value in ripened color of rice hull by silicate application were higher than those in the plots of NPK and NPK+compost, because of low percentage of rusty grain and sooty grain, The percentage of perfect grain in brown rice and in milled rice by the silicate application increased by 6.1~7.5% and by 1.8~3.5% respectively, as compared with the NPK application and white core and white belly of milled rice were decreased, The amylose content, protein content and starch-iodine blue value of milled rice by silicate application were lower than those in the plots of NPK and NPK+compost, while the peak point and breakdown viscosity of gelatinized rice flour on amylograph, and tastes value evaluated as a indicater of pannel test by nireco tester were higher. By silicate application these factors could be affected toward better in eating quality.
The degermed Japonica and J/Indica brown rites were successively milled to give 4.4%(fraction I), 4.7%(fraction II) and 5.9%(fraction III) yield of flour, with the remaining as residual kernel. The amino acid composition of the protein in the milled fractions was similar, except serine and histidine. With some amino acids, particularly phenylalanie, glycine and isoleucine, differences among varieties were much greater than among fractions of the same rice. The content of lysine was the highest in fractions I and II, whereas isoleucine showed the opposite trend to lysine. The first and second limiting amino acids of all fractions were lysine and threonine, respectively. No varietal differences in the distribution of fatty acids within the kernel were observed.
To investigate the possibility of discrimination between organic and non-organic rice using stable isotope nitrogen of natural abundance, organic rice of 17 samples and non-organic rice of 13 samples grown at adjoining organic rice field were collected in 2008. Rice was grinded into brown rice, milled rice and hull, and samples were analysed for nitrogen and $\delta^{15}N$ at NICEM. Authors also made inquiries about N source for both farmers who conduct organic- and non-organic rice cultivation. In order to know whether the $\delta^{15}N$ can be used in discrimination between organic and non-organic rice, discriminant analysis were made with SPSS and logistic method. 1. Organic farmers used manure, rice bran, used mushroom culture, fermented fertilizer (company products), and oil cake, but non-organic farmers applied compound fertilizer. Rice straws were remained in organic rice field while moved out in non-organic field. 2. There were difference in $\delta^{15}N$ among organic rice and its byproduct(7.760????% in hull, 6.720????% in rice), but significant difference was not found between them. And the trend was same between province. Non-organic rice showed similar results. 3. Significant difference of $\delta^{15}N$ were found between organic rice and non-organic rice (p<0.01) and between hull of organic rice and that of non-organic rice hull (p<0.05). $\delta^{15}N$ seemed to be useful criteria for discrimination of organic and non-organic rice. 4. When applied discrimination analysis of SPSS and logistic, there were significant difference between organic rice, non-organic rice and its byproducts except brown rice and hull in SPSS method. Hull can be used as the most useful component for unknown sample prediction with 83.3% probability.
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