• Title/Summary/Keyword: high-amylose content rice

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Genetic Diversity of Glutinous Rice Collections Based on Agronomic Traits and RAPDs (작물학적 형질과 RAPD에 의한 찰벼 수집종의 유전적 다양성)

  • Kim Guk-Hwan;Kim Hong-Sig;Lee Seok-Young;Chung Bong-Hwan;Song Beom-Heon;Cho Yong-Gu
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.50 no.3
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    • pp.212-220
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    • 2005
  • One hundred eleven glutinous rice collections from seven countries were evaluated for genetic diversity based on agronomic traits and RAPD analysis. Twelve agronomic traits including yield components amy-lose content, alkali digest value were used to clarify the genetic relationships among glutinous rice collections. Glutinous rice collections were classified into 4 groups and early maturings Korean landraces and high amylose indica belonged to group I with RAPD analysis, 15 primers selected for polymorphic bands generated 117 bands and 81 bands $(69.2\%)$ showed polymorphism. The number of amplified bands per primer ranged from 5 to 11, with the average number of bands of 7.8. With the similarity value of 0.78 in dendrogram derived from the cluster analysis based on RAPDs, glutinous rice collections were classified into 9 groups. Seventy-seven percent of the collections were classified into group I that is the largest one, while the others $(23\%)$ were distributed to group Il-IX. Group I included most indica type rices and early ripening collections, while the small groups of III-IX included most of the Korean collections.

The Rice Quality and Chemical Characteristics Affected by Moisture Content and Drying Delay Time after Harvest in Rice (벼 수확 후 수분함량별 건조지연에 따른 쌀 품위 및 화학성)

  • Kwon, Suk-Ju;Song, Eun-Ju;Kwon, Young-Rip;Choi, Dong-Chil;Choi, Yeong-Geun;Kwon, Tae-Oh
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.51 no.spc1
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    • pp.35-41
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    • 2006
  • This study was conducted to establish the post-harvest management system in rice. Harvested hulled rice was gathered into large-scale bag and combine bag, in which the rice quality and the influence on quality change were investigated on various storage periods and moisture contents. Moisture content of hulled rice ranged from 23.7% to 28.8% on different harvest times, which grew lower as harvesting time was delayed. When desiccation was retarded hulled rice in large scale bag was changed in color and emitted an of offensive odor in 3 days and that in combine bag showed similar symptom in 4 days. Inner temperature in large scale bag was changed a lot when the storage period was prolonged and also the moisture content was higher while that in combine bag increased regularly corresponding to the moisture content at the time of harvest. Moisture content of hulled rice stored in large-scale bag increased 2 days after harvest and the more moisture content showed the more increased tendency, while in the case of combine bag the moisture content was not changed much whether the hulled rice contained low or high moisture content in harvesting. As desiccation was delayed fatty acid increased much more in large-scale bag than in combine bag even though protein and amylose contentwere not changed. As desiccation was delayed more and hulled rice contained moisture more in harvesting head rice ratio of brown rice decreased and green-kerneled rice and damaged grain ratio increased and quality of milled rice also became deteriorated. As a result, desiccation day to minimize the deterioration of rice quality was estimated 1-2 days in large scale bag and 2-3 days in combine bag after harvesting.

Quality characteristics of frozen cookie dough using rice flour of super yield Korean rice varieties (초다수성 쌀가루를 이용한 쿠키용 냉동반죽의 품질 특성)

  • Lee, Nayoung;Ha, Ki-Young
    • Food Science and Preservation
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    • v.22 no.1
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    • pp.63-69
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    • 2015
  • The highly producible rice cultivars, hanareum and dasan 2, were prepared and investigated for their physicochemical properties, and the quality characteristics of frozen cookie dough with rice flour according to the thawing time were measured. The water, ash, crude protein, amylose, and damaged starch contents of rice flour, as well as its water holding capacity, particle size, and Hunter color value, were measured. The water, ash, and crude protein contents of the hanareum and dasan 2 rice flours were shown to range from 7.28 to 13.14%, from 0.35 to 0.39, and from 6.05 and 8.68%, respectively. The protein content of the control group was higher than that of hanareum and dasan 2 rice flours. The amylose contents of the hanareum and dasan 2 rice flour were 19.05 and 23.04%, respectively. The damaged starch content and water holding capacity of the control group were lower than those of the hanareum and dasan 2 rice flours. The particle sizes of the samples were $48.54{\sim}50.05{\mu}m$. The lightness values of the hanareum, and dasan 2 rice flour, and of the control were 93.72, 93.51 and 92.63, respectively. The quality characteristics of the gluten-free frozen cookie dough were investigated. The lightness of the cookie made with frozen cookie dough decreased according to the by thawing time, but the diameter of the cookie did not differ significantly. The hardness of the cookie made with rice frozen dasan 2 rice dough was lower than that of the cookie made with frozen hanareum rice dough.

Studies on the Palatability and Texture of Korean Rice Cultivars for the Cooked-rice Processing (가공밥 제조를 위한 밥의 식미 및 식감특성 평가)

  • Sim, Eun-Yeong;Park, Hye Young;Kim, Mi-Jung;Lee, Choon-Ki;Jeon, Yong Hee;Oh, Sea Kwan;Won, Yong Jae;Lee, Jeong Heui;Ahn, Eok Keun;Woo, Koan Sik
    • The Korean Journal of Food And Nutrition
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    • v.30 no.5
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    • pp.880-888
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    • 2017
  • Palatability and texture analysis of nine Korean rice cultivars were investigated to select the most appropriate rice variety for the cooked-rice processing. The rice cultivars studied consisted of Samkwang, Seonpum, Wolbaek, Andabyeo, Dasan-1, Ilpum, Haiami, Jungsanggold and Chindle. They revealed the moisture, protein, amylose and starch contents of 10~12, 5~6, 12~19, and approximately 90%, respectively. Among the evaluated rice varieties, WB exhibited the lowest amylose content (12.7%) and Jungsanggold the next (17.2%). In the rapid-visco analyzer test, Jungsanggold, Chindle, Wolbaek and Seonpum revealed a low value of final and setback viscosities than other varieties. Using a toyo meter analyzer, Chindle, Haiami, Samkwang were selected as having high toyo palatability values, while Dasan-1, Wolbaek and Andabyeo revealed low values. Toughness and adhesiveness of all nine cooked rice varieties were highest in Jungsanggold, Chindle and Ilpum. Also, palatability of cooked rice was highest in the following order: Chindle (80.03) > Samkwang (76.21) > Jungsanggold (74.08). The results of this study suggest that Chindle may be effectively used to produce processed cooked rice.

Effects of Slow-release Fertilizer Application on Rice Grain Quality at Different Culture Methods (벼 재배양식별 완효성 비료 시용이 미질 특성에 미치는 영향)

  • 정진일
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.41 no.3
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    • pp.286-294
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    • 1996
  • This experiment was conducted to determine the rice quality between slowlelease fertilizer(SRF) and conventional fertilizer (CF) with the amount of 100% and 80% under direct seeding on dry paddy field, respectively. In rice quality, the percentage of matured grain and immatured grain was higher in CF with machine transplanting than in SRF with direct seeding, and the less amount of fertilizer applied, the lower percentage of immatured grain was obtained. The percentage of carbohydrate showed the difference between CF and SRF, and higher at the level of 100% applicated than that of 80% application. The contents of fat and ash were higher in CF with less fertilizer, and there was no trend to different cultural methods but it was related to the amount of fertilizer in amylose content. The nitrogen and sodium content of milled rice was high in SRF under machine transplanting as well as direct seeding. Calcium and magnesium content showed high in direct seeding but there was not significantly difference between CF and SRF.

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Physicochemical Properties of Rice Flour of Different Cultivars using Wet and Dry Milling Processes (제분방법에 따른 품종별 쌀가루의 이화학적 특성 및 소화율)

  • Park, Jiyoung;Lee, Seuk-Ki;Park, Hye-Young;Choi, Hye-Sun;Cho, Dong-Hwa;Lee, Kyung Ha;Han, Sang-Ik;Cho, Jun Hyeon;Oh, Sea-Kwan
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.62 no.3
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    • pp.184-192
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    • 2017
  • Rice flours from five rice (Oryza sativa L.) varieties with different amylose content were prepared by both wet and dry milling processes. The moisture content of wet-milled rice flours (WMR) was approximately three-times higher than that of dry-milled rice flours (DMR). Water absorption index (WAI), water solubility index (WSI), and swelling power (SP) increased in proportion to temperature. The WAI, WSI and SP values of DMR were higher than those of WMR. Baeokchal (BOC), which is a waxy rice cultivar, had a significantly high WSI value. Pasting properties of DMR, except for the BOC cultivar, resulted in an increase in peak, trough, final, and setback viscosities. The levels of resistant starch in four cultivars, except for Dodamssal (DDS), were under 1%, irrespective of the milling process, whereas the resistant starch contents of DMR and WMR in DDS were 9.18% and 6.27%, respectively. In vitro digestibility of WMR was higher than that of DMR, and the estimated glycemic index of the rice flour varieties ranged from 57.6 to 81.3. Damaged starch content of WMR was less than that of DMR; in addition, a negative correlation was observed between the amylose and damaged starch contents of WMR. These results suggest that the properties of rice flour vary depending on the milling method and flour variety, and could be a reference for selecting the appropriate processing method.

Molecular Structure and Lipid in Starches for Mook (묵 제조용 전분의 분자구조와 지방질)

  • Chung, Koo-Min
    • Korean Journal of Food Science and Technology
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    • v.23 no.5
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    • pp.633-641
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    • 1991
  • Mook, a traditional gel food in Korea, has been made from mainly acorn, buckwheat, and mungbean starches (Mook Starches). Corn, rice, wheat starches (Non-Mook Starches) are not used due to their weak gelation power. In order to know the effects of properties of starch on gelation, some physicochemical properties, molecular structure, and starch lipid of these six starches were investigated and compared with gel hardness. Both amylose content and gel hardness of starches were in order of mungbean, acorn, buckwheat, wheat, corn, and rice and these two parameters showed a very good correlation (r=0.95). The amyloses of Mook Starches had larger molecular size (${\overline}D.P._{n}=1,080{\sim}1,580\;vs\;670{\sim}1,120$ for Mook Starches and Non-Mook Starches, respectively), more average number of chain ($2.9{\sim}5.4\;vs\;1.7{\sim}2.5$), and shorter average chain length ($290{\sim}390\;vs\;390{\sim}450$) than those of Non-Mook Starches. Also, Mook Starches had longer average chain length ($22.2{\sim}22.6\;vs\;18.9{\sim}21.3$) of amylopectin and less starch lipid content ($0.12{\sim}0.49\;vs\;0.68{\sim}1.26%$) than Non-Mook Starches. These properties had good correlations with gel hardness (r=0.76-0.84). Consequently, the gelation power of Mook Starches was thought to be derived from their high amylose content and other properties of starches.

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Trend and Further Research of Rice Quality Evaluation (쌀의 품질평가 현황과 금후 연구방향)

  • Son, Jong-Rok;Kim, Jae-Hyun;Lee, Jung-Il;Youn, Young-Hwan;Kim, Jae-Kyu;Hwang, Hung-Goo;Moon, Hun-Pal
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.47
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    • pp.33-54
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    • 2002
  • Rice quality is much dependent on the pre-and post harvest management. There are many parameters which influence rice or cooked rice qualitys such as cultivars, climate, soil, harvest time, drying, milling, storage, safety, nutritive value, taste, marketing, eating, cooking conditions, and each nations' food culture. Thus, vice evaluation might not be carried out by only some parameters. Physicochemical evaluation of rice deals with amy-lose content, gelatinizing property, and its relation with taste. The amylose content of good vice in Korea is defined at 17 to 20%. Other parameters considered are as follows; ratio of protein body-1 per total protein amount in relation to taste, and oleic/linoleic acid ratio in relation to storage safety. The rice higher Mg/K ratio is considered as high quality. The optimum value is over 1.5 to 1.6. It was reported that the contents of oligosaccharide, glutamic acid or its derivatives and its proportionalities have high corelation with the taste of rice. Major aromatic compounds in rice have been known as hexanal, acetone, pentanal, butanal, octanal, and heptanal. Recently, it was found that muco-polysaccharides are solubilized during cooking. Cooked rice surface is coated by the muco-polysaccharide. The muco-polysaccharide aye contributing to the consistency and collecting free amino acids and vitamins. Thus, these parameters might be regarded as important items for quality and taste evaluation of rice. Ingredients of rice related with the taste are not confined to the total rice grain. In the internal kernel, starch is main component but nitrogen and mineral compounds are localized at the external kernel. The ingredients related with taste are contained in 91 to 86% part of the outside kernel. For safety that is considered an important evaluation item of rice quality, each residual tolerance limit for agricultural chemicals must be adopted in our country. During drying, rice quality can decline by the reasons of high drying temperature, overdrying, and rapid drying. These result in cracked grain or decolored kernel. Intrinsic enzymes react partially during the rice storage. Because of these enzymes, starch, lipid, or protein can be slowly degraded, resulting in the decline of appearance quality, occurrence of aging aroma, and increased hardness of cooked rice. Milling conditions concerned with quality are paddy quality, milling method, and milling machines. To produce high quality rice, head rice must contain over three fourths of the normal rice kernels, and broken, damaged, colored, and immature kernels must be eliminated. In addition to milling equipment, color sorter and length grader must be installed for the production of such rice. Head rice was examined using the 45 brand rices circulating in Korea, Japan, America, Australia, and China. It was found that the head rice rate of brand rice in our country was approximately 57.4% and 80-86% in foreign countries. In order to develop a rice quality evaluation system, evaluation of technics must be further developed : more detailed measure of qualities, search for taste-related components, creation and grade classification of quality evaluation factors at each management stage of treatment after harvest, evaluation of rice as food material as well as for rice cooking, and method development for simple evaluation and establishment of equation for palatability. On policy concerns, the following must be conducted : development of price discrimination in conformity to rice cultivar and grade under the basis of quality evaluation method, fixation of head rice branding, and introduction of low temperature circulation.

Quality Characteristics of Long-term Stored Rice (장기 저장된 쌀의 품질 특성)

  • Han, Hye Min;Koh, Bong Kyung
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.41 no.11
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    • pp.1571-1576
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    • 2012
  • The purpose of this study was to investigate the physicochemical and pasting properties of long-term stored domestic and imported rice supplied for food processing from government-controlled public rice stocks. Goamibyeo, which was bred for processing and harvested in 2011, was selected as the control rice for comparison. Rice was dry-milled, and the amylose contents of stored rice were 12~13%. Stored rice kernels were significantly harder than those of control, whereas damaged starch content and water absorption of flour were not significantly different from those of control. Overall, long-term stored domestic and imported rice showed high peak viscosities along with high viscosities of both hot and cold pastes. Both imported and domestic rice demonstrated insufficient properties for making 100% flat rice noodles or bread. They showed the greatest shrinkage during cooling after baking. Although their levels of cooking loss were less than that of control, stored rice showed a less elastic and softer cooked noodle texture compared to control flour.

Comparison of Yield and Grain Quality of Ten High Quality Rice Cultivars Grown in Three Different Agricultural Regions of Gyeongsangbuk-do Province (경상북도 지역별 최고품질 벼 품종의 수량 및 품질 특성)

  • Shin, Jong-Hee;Kim, Sang-Kuk;Kim, Se-Jong
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.62 no.4
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    • pp.275-284
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    • 2017
  • Rice quality should be considered as a primary consumer requirement. Regarding marketing, characteristics such as appearance, physicochemical properties, and palatability of brand rice are of high economic importance. Therefore, this study was conducted to select the optimal rice cultivars representing the commercial rice brands of Gyeongsangbuk-do province in Korea. Various rice grain quality components, grain appearance, several physicochemical properties of rice grain, and texture or palatability of cooked rice grains of ten cultivars (namely 'top quality rice') cultivated at three different locations, such as inland mountainous and southern plain areas of Gyeongsangbuk-do province in 2013~2014, were evaluated, and the obtained data was analyzed. 'Hiami' showed slightly higher protein contents and lower palatability of cooked rice than the other rice cultivars. Rice production and head rice yield produced at Gumi were the highest. The protein content of milled rice produced at Andong, an inland mountainous region, was approximately 0.3% point lower than that from other locations, whereas the amylose content of milled rice was approximately 1% point higher than those from the other plain regions, Daegu and Gumi. We evaluated the texture, Glossiness value determined using a Toyo teste meter and palatability of cooked rice of ten cultivars. The hardness of cooked rice produced in Andong was slightly lower than that produced in Daegu and Gumi, and additionally, the palatability of cooked rice produced in Andong was the best, followed by that producted in Gumi and Daegu. Considering rice yield and grain quality in the major rice cultivation areas of Gyeongsangbuk-do province, the rice cultivars that may be suitable for each region could be recommended mid-late maturation: 'Younghojinmi' and 'Mipum' in Daegu, 'Daebo', 'Samgwang', Chilbo' and 'Younghojinmi' in Gumi, 'Samgwang', 'Jinsumi' and 'Sukwang' in Andong. These results obtained in this study imply that the selected cultivars with high yield and quality could be recommended with high priority to rice farmers in the regions.