• Korea-Australia Rheology Journal
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• 제19권4호
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• pp.221-225
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• 2007

Electrorheological characteristics of a dispersed system of phosphorylated potato starch particles in silicone oil investigated via a rotational rheometer equipped with a high voltage generator is being reanalysized. Flow curves of these ER fluids both under several applied electric field strengths and with different degrees of phosphate substitution were mainly examined via three different rheological constitutive equations of Bingham model, De Kee-Turcotte model and our previously proposed CCJ model. Among these, the CCJ equation was found to fit the data of phosphorylated potato starch well.

• 농업과학연구
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• 제16권1호
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• pp.102-110
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• 1989

가열조건(加熱條件)을 달리한 감자 전분(澱粉) 호화액(糊化液)의 X-ray diffractogram과 표면구조(表面構造)를 SEM으로 촬영(撮影)하여 관찰(觀察)한 결과(結果), 전분입자(澱粉粒子)의 모양은 계란형(鷄卵形) 이었으며, 호화시간(糊化時間)과 호화온도(糊化溫度)가 증가(增加)할수록 전분입자(澱粉粒子)는 파괴(破壞)되었고, 완전(完全) 호화시(糊化時)에는 전분(澱粉)의 구조(構造)를 나타내지 않았다. 시료(試料)감자 전분(澱粉)의 구성(構成)을 검토(檢討)하기 위하여, Amylose 함량(含量)과 Blue Value를 측정(測定)한 결과(結果), 각각(各各) 23.5%, 0.49%였다. X-ray diffractogram으로 호화도(糊化度)를 측정(測定)한 결과(結果), $70^{\circ}C$에서 90 %의 호화도(糊化度)를 보였고, 동일(同一)한 온도(溫度)에서 가열시간(加熱時間)에 따른 변화(變化)는 크지 않았으며, 인산염(燐酸鹽)의 농도(濃度)가 증가(增加)할수록 호화도(糊化度)도 증가(增加)하였다.

• 한국식품과학회지
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• 제26권4호
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• pp.475-478
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• 1994

식품에 사용되는 화학적 변성전분류와 acetyl화 전분이 사용된 라면의 돼지 췌장 ${\alpha}-amylase$에 의한 in vitro 소화율($37^{\circ}C$에서 6시간)을 비교하였다. Native potato starch와 acetylated potato starch의 가수분해율은 각각 64.5%와 59.3%, native와 hydroxypropylated corn starch는 70.5%와 60.4%, 그리고 native와 hydroxypropylated high amylose corn starch는 65.2%와 57.3%로서 native한 것들이 유도체들보다 높았다. Waxy corn starch들의 소화율은 pregelatinized(74.3%)>native(72.1%)>acetylated(66.5%)>acetyl distarch adipate(56.4%)>hydroxypropyl distarch phosphate(50.7%)의 순으로 감소하였다. 국내에서 생산, 판매되고 있는 5개 회사의 봉지라면과 용기라면에 대한 실험에서는 실제 조리조건에서 소화율에 유의적 차이를 보이지 않았다. 결론적으로 화학적 변성전분의 소화율은 천연전분보다 낮지만 상용식품에서의 사용량이 매우 낮으므로 식품 섭취에 따른 전분질의 소화율에는 큰 영향을 미치지 않을 것으로 판단된다.

• 한국생물정보학회:학술대회논문집
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• 한국생물정보시스템생물학회 2005년도 BIOINFO 2005
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• pp.151-155
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• 2005

Recently, systems biology has been increasingly applied to gain insights into the complexity of living organisms. Many inaccessible biological information and hidden evidences fur example flux distribution of the metabolites are simply revealed by investigation of artificial cell behaviors. Most bio-models are models of single cell organisms that cannot handle the multi-cellular organisms like plants. Herein, a structured and multi-cellular model of potato was developed to comprehend the root starch biosynthesis. On the basis of simplest plant cell biology, a potato structured model on the platform of Berkley Madonna was divided into three parts: photosynthetic (leaf), non-photosynthetic (tuber) and transportation (phloem) cells. The model of starch biosynthesis begins with the fixation of CO$_2$ from atmosphere to the Calvin cycle. Passing through a series of reactions, triose phosphate from Calvin cycle is converted to sucrose which is transported to sink cells and is eventually formed the amylose and amylopectin (starch constituents). After validating the model with data from a number of literatures, the results show that the structured model is a good representative of the studied system. The result of triose phosphate (DHAP and GAP) elevation due to lessening the aldolase activity is an illustration of the validation. Furthermore, the representative model was used to gain more understanding of starch production process such as the effect of CO$_2$ uptake on qualitative and quantitative aspects of starch biosynthesis.

• 농업과학연구
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• 제18권1호
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• pp.41-48
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• 1991

각(各) 조건별(條件別) 감자전분(澱粉) 호화액(湖化液)을 Brookfield 단원통(單圓筒) 회전점도계(回轉粘度計)로 실험(實驗)한 리올로지 특성(特性)을 살펴보면, 3-7%의 감자전분(澱粉) 호화액(湖化液)은 모두 강복응력(降伏應力)을 갖는 의가소성(擬可塑性) 유체(流體)로서 시간의존성(時間依存性) 구조붕괴(構造崩壞)를 나타내는 Thixotrophic 특성(特性)을 나타내었다. 여기서 점조도지수(粘租度指數)와 강복응력(降伏應力)은 농도(濃度)에 비례(比例)하였으나, 유동거동지수(流動擧動指數)는 각(各) 조건(條件)에서 일정(一定)한 관계(關係)를 보이지 않았다. 첨가제(添加製)인 인산염(燐酸鹽)을 첨가(添加)하였을 때 호화(湖化) 감자전분(澱粉)의 점조도지수(粘租度指數)와 강복응력(降伏應力)값은 크게 감소(減少)하였으나 유동거동지수(流動擧動指數)의 값은 약간 증가(增加) 하였다. 또한 4% 감자 전분(澱粉) 호화액(湖化液)에서 초기(初期) 및 평충상태(平衝狀態) 에서 활성화(活性化) 에너지를 측정(測定)한 값은 각각 1.52Kcal/g.mole과 1.27 Kcal/g.mole 이었다.

• 한국미생물·생명공학회지
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• 제38권4호
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• pp.385-390
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• 2010

청국장의 기호도를 개선하는 발효균으로 분리된 protease 생산균은 Bacillus licheniformis로 확인되었다. Protease 생산을 위한 배지를 최적화하기 위한 탄소원, 질소원, 인, 금속이온의 성분을 변화시키면서 균의 성장과 효소 생산성을 비교하였다. Glucose를 탄소원으로 사용하였을 때는 균의 성장은 정상적으로 일어나지만, protease 생산이 심하게 억제되는 것으로 나타났으며, Potato starch를 탄소원으로 사용하였을 때 효소 생산성이 가장 높았다. 질소원으로는 yeast extact가 효소 생산에 가장 적합하였다. 한편 2가 금속이온중 $Zn^{2+}$, $Cu^{2+}$, $Co^{2+}$을 배지에 첨가하였을 때는 균의 성장이 심하게 저해되었으며, 효소 생산도 되지 않았다. $CaCl_2$를 첨가한 배지에서는 균이 성장과 효소 생산성이 증가되었다. Potato starch(1.5%), yeast extract(1.5%), $CaCl_2$(0.7%), $K_2HPO_4$(0.03%)와 $KH_2PO_4$(0.03%)를 포함하는 것으로 구성된 최적화 배지에서 최대효소 생산성은 800 U/mL로 나타났으며 28시간 이후에는 배양액내 효소활성이 서서히 감소하였다.

• 미생물학회지
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• 제9권3호
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• pp.103-120
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• 1971

We have been studied on brewing sweet starch. We obtained the results as follows ; 1) 5 strains, T-T-2, T-T-4, T-K-2, T-T-18, T-T-1, were the most available in view of fermentative power by capacity of $CO_2$. 2) 5 strains, T-T-4, T-T-2, T-T-1, T-T-3, T-K-2, produced capacity of alcohol more than 5.78%. 3) 6 strains, T-T-2, T-K-2, T-T-4, T-S-2, T-I-3, T-I-1, are available not only taste and flavour, but productive power of alcohol in sweet potato starch. 4) The form of 6 strains are long oval and round and most of them are similar to the other yeast in size. 5) In giant colony the color was cream color and cream buff, and T-K-2 was formed by $15{\times}12mm$ on diameter and by 3.5mm on high. 6) Optimum temperature of most of all strains is 25~ $300^{\circ}C$but T-K-4 is 28-30.deg.C. 7) Optimum pH is 3.4-4.6. 8) T-S-2 was died off at 65.deg.C, the other strains died $60^{\circ}C$. 9( Making Bun-kok with non-heated wheat bran .alpha.-amylase was more increased by 4.5-13.5 mg of glucose in reaction solution and .betha.-amylase more 1.6-3.4ml of N/10-$KMnO_4$ Solution than Bun-kok with heated wheat bran. 10) It seems that mycellium grows better than original in substance containing 0.4 ~ 1.2% of HCl. 11) Making Bun-kok to add 0.8% HCl, .alpha.-amylase was increased 9.93-20.7mg of glucose and .betha.-amylase ws increased 2.6~4.3ml of N/10-$KMnO_4$ solution to reaction solution. 12) 1.2%-HCl, or higher concentration, acts as inhibitor, in the meanwhile the concentration between 0.4~0.8% of HCl acts as activator. 13) We must make Bun-kok for 42 hours, at 28~$30^{\circ}C$) After we made Bun-kok using S-O-II and R-J-I one by one, Bun-kok which mix each other in equal quantity is increased more than original on enzyme acrivity. 15) Oxidation is the best way of refining sweet potato starch in N/10-phosphate buffer solution (pH 7.5). 16) When we prepared sweet potato starch, first pH was 3.0.

• 한국식품과학회지
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• 제54권4호
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• pp.377-385
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• 2022

본 연구는 감자를 산업소재로서의 이용가능성을 높이기 위한 기초자료를 확보하기 위해 국내에서 육성된 감자 24품종을 이용하여 식이섬유 함량을 비교 분석한 다음, 품종별로 전분을 추출하여 이화학적 특성을 관찰하였다. 감자 원료의 총 식이섬유 함량을 분석한 결과 아리랑1호 품종이 6.30%로 가장 높은 식이섬유 함량을 보였다. 감자 품종별로 전분을 추출한 다음 아밀로스 함량을 측정한 결과 36.76-55.75%로 수선 품종이 가장 높았고. 아밀로펙틴 가지사슬길이 분포가 DP13-24가 약 60% 이하로 가장 많은 비율을 보였다. 인 함량을 분석한 결과 45.90-84.23 mg/100 g의 범위로 아리랑1호 품종이 가장 높고, 은선이 가장 낮았다. 감자 전분에 함유된 저항전분 함량은 58.94-79.87% 범위로 아리랑2호가 가장 높은 함량을 보였다. 호화 점도 특성을 분석한 결과, 강하점도의 경우 587.45-1,129.72 RVU 범위로 금선이 가장 높았고, 치반 점도는 -864.31- -353.22 RVU 범위로 금선이 가장 낮았다. 감자 전분의 품종별 호화엔탈피 값을 분석한 결과, 5.54-7.64 J/g의 범위로 수선이 가장 낮았고, 다미가 다른 품종에 비해 높은 값을 보였다. 본 연구결과를 통해 국내산 감자전분의 산업소재로서 다양하게 이용하기 위한 기초자료로 이용될 수 있을 것으로 판단되며, 보다 많은 자료 확보를 위해 재배 및 저장 조건 등에 따른 전분 특성에 관한 연구가 지속적으로 진행되어야 한다고 생각된다.

• 한국식품영양과학회지
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• 제27권5호
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• pp.881-889
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• 1998

For the application of the commercially modified starch in frozen and retort foods, apparent viscosity and water loss were measured at each stages of heating, sterilization and freezing-thawing stages. Apparent viscosity showed the exponential increase with concentration and the slopes of apparent viscosity against concentration in the Firm-Tex(hydroxypropyl distarch phosphate), Hi-Flo(acetylated distarch adipate) and Colflo 67(acetylated distarch adipate) from waxy maize starch were higher than those of Amyloacetate M20(starch acetate) and X-amylo 250(distarch phosphare) from potato starch. In the presence of 1 or 2% NaCl, X-amylo 250 among modified starches showed the increase in water loss and the decrease in apparent viscosity, whereas Colflo 67, Hi-Flo and Firm-Tex were little affected by NaCl. In the presence of 1 or 2% sucrose, water loss and apparent viscosity of the modified starches were not affected. In the range of pH 4~8, water loss and apparent viscosity of the modified starches had no change but the differences were detected to some extent between each of heating, sterilization and freezing-thawing stages. In the apparent viscosity and water loss of the modified starches after 3 week storage from heating and sterilization, Hi-Flo, Amyloacetate M20 and X-amylo 250 were not changed at the storage period, and the overall acceptability of retort food containing the modified starches such as Firm-Tex and Amyloacetate M20 were favored more than others. In the apparent viscosity and water loss of the modified starches which have been frozen and thawed three times repeatedly, Colflo 67, Hi-Flo and Firm-Tex were not changed in freezingthawing, and the overall acceptability of frozen food containing Firm-Tex was most favored.

• 한국작물학회지
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• 제27권4호
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• pp.462-469
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• 1982

Since 1962, varietal development and dissemination for summer upland crops have been actively initiated by the Crop Experiment Station, Office of Rural Development, Suweon, Korea. The major breeding objectives of soybeans have been to develop varieties which are early maturing, disease resistant, and adaptable to late planting for after-barley cropping. Development of eleven new soybean varieties including Hwangkeumkong, Jangyeobkong, Danyeobkong, and Kwangkyo has greatly increased the soybean yield throughout country. For com, after development of Hwangok #2, a synthetic, in early 1960's, nine corn hybrids-single crosses, double-crosses, and three-way crosses-such as Jecheon-ok, Hoengseong-ok, Kwangok, Suweon #19, etc., have been disseminated mainly to Kangweon province, a major corn producing area in Korea, and drew up the yield over 4 tons per hectare. The major breeding objectives of sweet potato have been to develop varieties which have high starch content and root yield. Hwangmi, Hongmi, and Shinmi are three sweet potato varieties developed and disseminated by the Crop Experiment Station, Office of Rural Development and are grown most widely in Korea. Most of researches on cultural practices of upland crops have begun on a full scale from early 1960's. In soybeans, for example, no fertilizer but for barley was applied although the effects of phosphate and potassium fertilizers were great on soybeans in after-barley soybean croppings. The effects of heavy application of phosphate and calcium fertilizers on soybeans in newly reclaimed soils were recognized. Recently a mixed fertilizer for soybean (N; 40, P:70, K:60 kg/㏊) was developed and sold for soybean growers. The optimum planting densities of 220, 000 plants/ha in full-season cropping and 330, 000 pts/ha in after-barley cropping of soybeans were known from repeated experiments. For higher yield, a means of cultural practices such as transplanting-pinching, direct planting-pinching, and hilling-up, etc., were developed along with barley-stubble planting with no tillage and integrated herbicide application for labour savings. For sweet potato, cultural practices for planting date, harvesting date, fertilizer, and planting density were fully established. For early marketing, a technique of vinyl-mulching on sweet potato has also fully developed. For com, planting density of 37, 000 pts/ha in early 1960's has been changed to 55, 000 pts/ha for grain production and 67, 000 pts/ha for silage. The amounts of fertilizers have also been changed from 120-120-120kg/ha (N-P-K) in early 1960s to 180-150-150 kg/ha. These increases in number of plants per unit area and fertilizer levels have resulted in greater production for both grain and silage. At the same time, the production techniques of F1 seeds have also improved.