• Journal of Biosystems Engineering
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• 제29권2호
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• pp.121-130
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• 2004

This study was carried out to develop a miller to produce white embryo rice with functional nutrients by improving the conventional vertical miller. The effects of rice moisture content and the shaft revolution speed of the miller on germ(embryo) adherence rate, whiteness, broken rice rate, and cracked rice rate were investigated. Also, the effect of the mesh size of emery stones on the germ adherence rate was investigated. The vertical prototype miller was improved with the increasement of about 42% in producing white embryo rice at proper conditions(shaft revolution speed of 900 rpm, emery stones of mesh ＃50, processing capacity of 2.3t/h, zero outlet resistance, rice moisture content of 16.2%). The results were as follows: 1. The germ adherence rate of white rice was significantly influenced by the moisture content of brown rice. The germ adherence rate of white rice decreased rapidly with the increase of the moisture content of brown rice. When brown rice with moisture content of 13.2%, 14.5%, 15.2%, 15.4% was milled by the prototype with emery stones of mesh ＃35 and shaft speed of 900(1,100) rpm, rpm adherence rate of milled rice was 76.2%(70%), 69.2%(66%), 45.9(38%), 13.0(9%), respectively. 2. The whiteness of white rice milled by the prototype with emery stones of mesh ＃35 and shaft speed of 1,100(900)rpm increased from 27(23) to about 40, respectively, as the moisture content of brown rice increased from 13.2% to 17.2%. 3. The rate of broken rice of white rice milled at 900rpm decreased by 0.6∼1.0% compared with that at 1,100rpm when the moisture content of brown rice was less than 15.2%. 4. The germ adherence rate was increased by 10.3% and 11.0%, respectively when brown rice with moisture content of 16.2% and 15.5% was milled by the prototype miller with shaft speed of 900rpm and emery stones of mesh ＃50 instead of mesh ＃35. 5. Considering the germ adherence rate, broken rice rate, and whiteness of milled rice, the proper milling conditions of the prototype miller for producing embryo rice were the moisture content of about 15%, the processing capacity of 2.3t/h and minimum outlet resistance of 0Nㆍm with shaft speed of 900rpm and emery stones of mesh ＃50.

• 한국작물학회지
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• 제36권3호
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• pp.197-203
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• 1991

화청벼와 IR24의 수정란에 N-methyl-N-nitros-ourea(MNU)를 처리하여 여러 종류의 배란 및 배 돌연변이체를 유기하였다. 그 결과는 다음과 같이 요약된다. 1. 변이체들에 대한 외관특성, SEM 검경 특성 및 amylose 함량 분석을 통하여 각각 dull, 찰성, 심백, 분질, sugary, shrunken, 유색종피 변이체들로 명명하였다. 2. 변이체들 중에서는 심백 변이체들의 비율이 74.8%로 가장 높았다. 3. 47320(dull)을 제외한 모든 변이 형질은 단순열성 돌연변이인 것으로 나타났다.

• Journal of Biosystems Engineering
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• 제22권3호
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• pp.295-302
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• 1997

An ultimate purpose of this study was to develop an automatic system for brown rice quality inspection using image processing technique. In this study emphasis was put on developing an algorithm for discriminating the brown rice kernels depending on their external quality with a color image processing system equipped with an adaptor magnifying the input image and optical fiber for oblique lightening. Primarily, geometical and optical features of images were analyzed with paddy and the various brown rice kernel samples such as a sound, cracked, peen-transparent, green-opaque, colored, white-opaque and brokens. Secondary, geometrical and optical parameters significant for identifying each rice kernels were screened by a statistical analysis(STEPWISE and DISCRIM procedure, SAS wer. 6) and an algorithm fur on- line discrimination of the rice kernels in static state were developed, and finally its performance was evaluated. The results are summarized as follows. 1) It was ascertained that the cracked kernels can be detected when e incident angle of the oblique light is less than 2$0^{\circ}C$ but detectivity was significantly affected by the angle between the direction of the oblique light and the longitudinal axis of the rice kernel and also by the location of the embryo with respect to the oblique light. 2) The most significant Parameters which can discriminate brown rice kernels are area, length and R, B and r values among the several geometrical and optical parameters. 3) Discrimination accuracies of the algorithm were ranged from 90% to 96% for a sound, cracked, colored, broken and unhulled, about 81 % for green-transparent and white-opaque and 75 % for green-opaque, respectively.

• 한국육종학회지
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• 제41권2호
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• pp.84-91
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• 2009

Rice consumption per capta, in South Korea, has been decreased dramatically, owing to the changes of living patterns. Because of not only the major energy source of Korean people but also major income source of Korean farmers, diversifying end-use-quality of rice has been demanded. To the context, 'Suweon 472', a high yielding and early mature japonica line and released as 'Namilbyeo' to framers in 2002, was treated with a chemical mutagen, Sodium Azide to find endosperm mutant types. A total of nine endosperm mutat lines, including five waxy, one dull, two floury, and one white core type, were identified from the 3,542 mutatagen treated lines. Amylose contents, iodine reaction, disintegration in alkali solution, gelatinization in urea solution and amylogram properties of those nine endosperm mutant lines were evaluated to address the possibility as new genetic materials for diversifying rice quality of Korean japonica cultivars. All embryo mutants were clearly differentiated from their wild type, 'Suweon 472', in terms of physic-chemical properties evaluated. The endosperm mutant lines would be very useful in expanding untiliztation of rice through opening new rice markets of processed foods from Korean japonica rice.

• 한국식품영양과학회지
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• 제36권4호
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• pp.499-502
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• 2007

본 연구에서는 쌀 섭취의 중요성에 착안하여 건강 기능성 쌀로 개발된 특수미의 항산화 성분을 분석하고자 하였다. 특수미의 polyphenol, phytic acid, anthocyanin은 비색법으로 vitamin E는 순상 HPLC로 분석하였다. 본 연구 결과 일반백미에 비해 특수미는 그 종류에 따라 약 $2{\sim}9$배의 높은 total polyphenol 함유하는 것으로 확인되었다. 또한 쌀에는 insoluble polyphenol이 total polyphenol의 약 $25{\sim}47%$를 차지하는 것으로 나타났다. 쌀의 vitamin E 함량은 백미(0.23mg ${\alpha}-TE/100g$)에 비해 현미(1.02mg ${\alpha}-TE/100g$) 및 특수미 $(0.97{\sim}1.21mg\;{\alpha}-TE/100 g)$에서 높은 함량을 보였고 phytic acid 함량은 백미, 현미, 거대배아미, 녹미, 적색미, 고아미, 흑미 순으로 각각 529, 1,429, 1,507, 1,561, 1,732, 2,163mg/100g으로 나타났다. 일반미와 특수미의 anthocyanin 함량을 측정한 결과 흑미 (302mg/100g)를 제외한 나머지 시료에서는 검출되지 않았으며 일반미와 특수미의 anthocyanin 함량 비교를 위해서는 HPLC 등을 이용한 정밀한 방법이 적용되어야 하겠다. 본 연구 결과는 쌀의 항산화 성분과 항산화 활성 연구에 있어 기초 자료로서 활용될 것으로 예상되며, 건강증진 식품으로서의 쌀을 인식시켜 나아가 쌀의 소비 촉진에 상당한 영향을 미칠 것을 기대된다.

• Journal of Biosystems Engineering
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• 제29권2호
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• pp.131-140
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• 2004

본 연구에서는 배아미, 현미, 가능성쌀들 및 진공을 요하는 식품의 품질을 보존하기 위해서 연속식 자동진공포장기를 국내 최초로 개발하였다. 배아미의 진공포장 성공률은 92.6%이었고, 실패율 7.4%에서 진공포장기 자체에서 불완전 테이핑의 밀봉작업으로 진공이 서서히 풀리는 경우가 5.5%, 그리고 진공하기 전 자동비닐포장기에서 포장시 봉지 윗부분 밀봉이 불완전해 1.9%가 진공이 풀렸다. 이에 개발한 자동진공포장기의 진공포장성공률은 약 94.5%수준이었다. 진공포장기로 진공시간에 따른 진공압력을 측정하였고, 배아미 2, 3, 5 kg를 진공포장하는데 소요되는 시간은 각각 6, 8, 11초이었다. 진공포장으로 처리한 배아미와 진공포장 처리하지 않은 배아미를 각각 3재월간 저장실험하여 백도, 함수율, 과산화물가, 산가를 저장기간별로 분석하였다. 그 결과, 백도는 진공처리가 2 감소, 비처리가 4 감소하였고, 함수율은 진공처리가 0.8%감소, 비처리가 1.3%감소, 과산화물가는 진공처리가 최대 1.89 meq/kg까지 서서히 증가하였고, 비처리가 3.45 meq/kg까지 급속히 증가하였다가 서서히 감소하였다. 산가 역시 진공처리가 최대 0.71 mg/g까지 서서히 증가하였고, 비처리의 경우는 0.98 mg/g까지 급속히 증가하였다. 그리고 현미의 진공포장에서도 산가 및 과산화물가 변화가 배아미 경우와 비슷하였다. 또한 진공포장 제품에 인위적으로 쌀벌레들을 넣은 경우 15일 지나면 산소부족으로 모두 사멸하였다. 따라서 개발한 진공포장기로 진공포장한 경우 배아미 및 현미의 품질을 잘 보존할 수 있었다.