• 한국식품과학회지
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• 제35권4호
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• pp.545-550
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• 2003

${\beta}$-Glucan이 보리 전분의 호화양상에 미치는 영향을 조사하였다. RVA 분석에 의하면 ${\beta}$-glucan의 첨가에 의해 전분은 RVA 상에서의 호화개시가 빨라지고 점도가 크게 증가하는 것으로 나타났다. 또한 DSC 분석 결과 ${\beta}$-glucan 첨가에 의해 전분입자가 안정화되어 전분의 호화개시 및 peak 온도가 증가하였으며, X-선 회절 양상 결과에서도 ${\beta}$-glucan 첨가에 의해 전분의 결정성이 증진되어 DSC 분석과 동일한 결과를 나타내었다. 그러나 ${\beta}$-glucan 첨가는 전분의 호화과정 중의 전분입자의 형태 및 amylose, amylopectin의 용출양상과 팽윤력, 용해도 등의 호화시 발생하는 특성의 변화에는 거의 영향을 미치지 않는 것으로 나타났다.

• Food Science and Biotechnology
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• 제18권1호
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• pp.118-123
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• 2009

In order to find out the effect of low level of starch acetylation on physicochemical properties of potato starch, amylose content, digestibility of raw and gelatinized starch, thermal properties, pasting properties, and the swelling power of native and acetylated potato starches were measured. The amylose content was significantly lower in acetylated starch than in their counterpart native starches. Though a tendency in the decrease in digestibility of raw starch was observed with starch acetylation, acetylation did not alter the proportion of readily digestible starch (RDS), slowly digestible starch (SDS), and resistant starch (RS) of both raw and gelatinized potato starches. No clear increase in the swelling power was observed, however, the peak and onset gelatinization temperatures and the enthalpy required for starch gelatinization decreased with starch acetylation. Peak and breakdown viscosities were reduced due to acetylation of potato starch while final viscosity and set back were increased.

• Food Science and Biotechnology
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• 제14권4호
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• pp.470-473
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• 2005

Starch was isolated from turnip (Brassica rapa L.), and to elucidate the structure-function relationship its structural and physical properties were characterized. Morphological structure of the starch was analyzed by SEM (Scanning Electron Microscopy). Most of the starch granules were spherical in shape with diameter ranging from 0.5-10mm. Apart from larger granules ($<10\;{\mu}m$) which dominated the population size of turnip starch, significant amount of small ($0.5-2\;{\mu}m$) and mid-size granules (${\sim}\;{\mu}m$) were also detected. It was revealed that presumably, erosion damages occurred due to the attack of amylase-type enzymes on the surface of some granules. Branch chain-length distribution was analyzed by HPAEC (High-Performance Anion-Exchange Chromatography). The chain-length distribution of turnip starch revealed a peak at DP12 with obvious shoulder at DP18-21. The weight-average chain length ($CL_{avg}$) was 16.6, and a large proportion (11.8%) of very short chains (DP6-9) was also observed. The melting properties of starch were determined by DSC (Differential Scanning Calorimetry). The onset temperature ($T_o$) and the enthalpy change (${\Delta}H$) of starch gelatinization were $50.5^{\circ}C$ and 12.5 J/g, respectively. The ${\Delta}H$ of the retrograded turnip starch was 3.5 J/g, which indicates 28.2% of recrystallization. Larger proportion of short chains as well as smaller average chain-length can very well explain relatively lower degree of retrogradation in turnip starch.

• 한국식품영양학회지
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• 제30권3호
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• pp.464-472
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• 2017

The qualities of rice cooked on heat plate, induction heat and heat plate with pressure, were investigated. The weight, volume, water soluble index (WSI), hydration by SEM (Scanning Electron Microscope), and gelatinization by DSC (Differential Scanning Calorimetry), as well as the consumer acceptability of cooked rice were analyzed. The weight, volume and WSI of rice cooked on heat plate with pressure were higher than those of rice cooked on heat plate and induction heat. The rice cooked on heat plate with pressure also showed higher degree of hydration and gelatinization, and lower degree of enthalpy of gelatinization than the rice cooked on heat plate and induction heat for 5~15 min. The consumer acceptability revealed that the odor, appearance, taste, texture and overall acceptance of rice cooked on induction heat were better than those of rice cooked on heat plate and heat plate with pressure. During storage in a cooker for 0~12 h, there was a decrease in the consumer acceptability of cooked rice. Overall results indicate that the qualities of rice cooked on induction heat and heat plate with pressure were higher than those of rice cooked on heat plate.

• 한국식생활문화학회지
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• 제19권3호
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• pp.359-368
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• 2004

The Physicochemical, sensory and cooking properties of functionally fortified rice with dietary fiber and chitosan were compared with regular rice when the rices were cooked with pressure and electric cookers. Moisture content of functional rice before cooking was 11.11%, which was lower than 13.72% in regular rice. Accordingly, moisture contents of functional rice samples cooked both with pressure and electric cookers were lower than those of regular rice. L value showing the degree of lightness of cooked rice was significantly higher in rice samples cooked with pressure cookers. The ${\alpha}$ value, the degree of redness and the b value, the degree of yellowness, were the highest in the functional rice cooked with an electric rice cookers. Textural measurement of hardness using a rheometer showed the highest value in functional rice cooked with a pressure cooker. The degree of gelatinization measured using differential scanning calorimetry (DSC) before cooking showed higher onset gelatinization temperature ($T_0$) and peak gelatinization temperature ($T_p$) in functional rice compared with those in regular rice. The gelatinization enthalpy (${\Delta}H$) of functional rice was lower than that of regular rice, showing that functional foe had lower gelatinization energy compared with regular rice. When the samples were stored in a refrigerator for one week, the DSC showed faster retrogradation degrees in samples cooked with electric rice cooker, having significantly higher enthalpies of regular and functional rice cooked with electric cooked compared to those cooked with pressure cookers. The functional rice samples cooked with pressure cooker had higher consumer acceptance test values compared to those cooked with electric cookers.

• Applied Biological Chemistry
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• 제38권4호
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• pp.353-358
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• 1995

옥수수 전분(초기 수분함량 11.4%)을 $130{\sim}220^{\circ}C$에서 건열처리하여 DSC로 열분석한 결과 $190^{\circ}C$이상에서 호화엔탈피는 감소하였고 알칼리호화시 열처리온도가 상승할수록 점도가 증가하였다. $170^{\circ}C$이상에서 열처리 온도가 높아질수록 원료전분에 비하여 최고점도를 포함한 아밀로그램상의 모든 값들, 전분호화액의 전단응력과 겉보기점도, 점조도지수 및 항복응력은 감소하였다. $90^{\circ}C$에서 호화진행에 따라 모든 시료들의 겉보기 점도와 항복응력은 상당히 증가하였으며 $190^{\circ}C$시료는 특히 초기에 급증하였으나, 점조도지수는 약간 증가한 반면에, 유동거동지수값들은 큰 차이를 보이지않았다. 그러나 $220^{\circ}C$의 경우 모든 값들이 다른 시료들에 비하여 크게 낮았다.

• 한국식품영양학회지
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• 제22권4호
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• pp.587-597
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• 2009

Peeled chestnuts were stored at different temperatures($-10^{\circ}C$ and $-20^{\circ}C$) and after blanching at $90^{\circ}C$ for different lengths of time(0, 10, and 20 min) for 6 months. After the storage period, the texture, color, DSC and sensory characteristics were analyzed. Hardness, fracturability and chewiness increased with storage time, whereas springiness and cohesiveness decreased. Additionally, the L* decreased and a* and b* increased with storage time. Analysis of the DSC revealed that the peak of the retro gradation was approximately $46{\sim}60^{\circ}C$ and enthalpy for the peak increased with storage time. Additionally, the increment of enthalpy for samples stored at $-20^{\circ}C$ and blanched was lower than that of samples stored at $-10^{\circ}C$ and non-blanched samples. The sensory evaluation scores were also higher for samples stored at $-20^{\circ}C$ and blanched samples than for those stored at $10^{\circ}C$ and non-blanched samples.

• 한국식품과학회지
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• 제23권3호
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• pp.341-348
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• 1991

점질인 황미와 분질인 수원 147 고구마 전분을 99% 메탄올로 탈지하고 추출된 지질을 첨가한 다음 이화학적 성질과 호화특성을 조사하였다. 전분입자의 모양은 다각형과 둥근형이었고, 크기는 $5{\sim}13\;{\mu}m$이며, 결정형은 모두 Ca형이었고 탈지나 지질 첨가 후 결정강도는 감소하였다. 아밀로오스 함량은 탈지 후 증가하였으나 지질 첨가 후에는 감소하였고, 물결합 능력은 증가하였다. 팽윤력과 용해도는 $55{\sim}60^{\circ}C$에서 급격히 높아졌고, 각 온도에서의 팽윤력은 탈지 후에는 증가, 지질 첨가 후에는 낮아졌다. 광투과도는 황미가 $60^{\circ}C$, 수원 147이 $65^{\circ}C$에서 급격한 증가를 보였고, 아밀로그라프에 의한 호화온도는 황미와 수원 147이 각각 $67.5,\;72.7^{\circ}C$였고, 황미의 최고점도, 냉각 정도는 수원 147보다 낮았고, 탈지시 최고 점도, hot paste viscosity, setback은 감소했고, 지질 첨가후에 최고 점도는 감소했으나 setback과 consistency는 크게 증가하였다. DSC에 의한 호화온도는 황미와 수원 147 각각 $67.5,\;68.5^{\circ}C$였고, 탈지 후에는 호화온도와 엔탈피는 낮아졌고, amylose-lipid melting peak는 소실되었으며 지질 첨가 후에도 호화온도와 엔탈피가 낮아졌다.

• 한국식품영양과학회지
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• 제32권8호
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• pp.1262-1269
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• 2003

효소류의 떡 노화에 미치는 영향을 검토하였다. DSC 열특성의 검토에서 호화개시온도는 GP(glucoamylase+pullulanase)로 처리한 경우가 71.1$^{\circ}C$로 가장 낮고 그 다음이 $\beta$-amylase, $\alpha$-amylase 순이었다. 또 호화최대온도는 효소 처리한 것이 대조구에 비해서 대부분 낮은 편이었으며 그 중 GP처리한 것이 가장 낮은 것으로 나타났다. 또 떡의 용융 enthalpy는 GP, $\beta$-amylase, $\alpha$-amylase 순으로 증가하였으며 GP의 용융 enthalpy값이 다른 경우보다 많이 낮게 나타났다. 재결정도는 GP의 값이 크게 낮은 것으로 나타났다. Avrami exponent(n)는 0.90 ∼ 1.20 범위에 있었으며 노화속도의 시간상수 1/k은 GP, $\beta$-amylase, $\alpha$-amylase, Control의 순이었다. 효소류를 첨가한 떡의 조직감은 대조구에 비해서 차이를 보였으며 종류별 효과는 GP, $\beta$-, $\alpha$-amylase의 순으로 나타났다. L＊ 값은 $\beta$-amylase를 제외하고는 모두 감소하고 a＊ 값은 효소간 5% 수준에서 유의차를 나타내었다. b＊ 값의 경우는 GP는 청색 방향으로, $\beta$-, $\alpha$-amylase는 반대인 황색 방향으로 변하였다. 효소 처리한 떡의 관능검사는 효소 처리한 것이 대조구보다 다소 높은 값을 나타내어 좋은 관능성을 보여주었다.

• 한국식품영양과학회지
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• 제39권9호
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• pp.1405-1409
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• 2010

특수미 품종인 유색미, 향미, 거대배아미의 지방산 및 아미조산 조성과 호화특성을 분석한 결과는 다음과 같다. 주된 지방산은 linoleic acid, oleic acid, palmitic acid이며, 특히 linoleic acid와 oleic acid가 전체 지방산의 75~80%를 차지하였다. 아미노산은 품종 간에 다소 차이가 있으나, 주요 아미노산은 glutamic acid와 aspartic acid로 분석되었으며, 적진주 품종인 경우는 cysteine과 GABA가 주요 아미노산이었고, 특히, 큰눈에는 cysteine과 GABA가 유의하게 높게 함유되어있는 것으로 나타났다. 특수미의 호화특성을 DSC 분석한 결과, 찰성인 조생흑찰과 화선찰벼가 호화에 필요한 흡열 엔탈피(${\Delta}H$)가 유의적으로 높게 나타났다. 또한, 유색미 품종인 흑진주와 적진주의 열적 특성인 호화개시온도, 최대호화온도 및 호화종결온도가 일반 메성 쌀인 일품현미에 비하여 높게 나타나, 유색미 품종의 취반 특성이 일반 현미에 비하여 낮을 것으로 분석되었다.