• Food Quality and Culture
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• 제3권2호
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• pp.53-58
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• 2009

This study was conducted to investigate the quality characteristics of frozen stored mungbean starch gels added with sucrose fatty acid ester (SE). The study showed a delay of gelatinization of mungbean starch by SE addition through the measurements conducted by using Rapid Visco Analyzer (RVA) and Differential Scanning Calorimeter (DSC). In the color of SE added frozen stored gels, lightness (L) and yellowness (b) values were increased compared to those of values measured from freshly prepared gel, whereas redness (a) value was decreased. The addition of 1% SE on mungbean starch gel prevented the color change during frozen storage. Rupture stress and rupture energy of frozen stored gel was higher than those of freshly prepared gel, whereas rupture strain of frozen stored gel was lower than that of freshly prepared gel. The addition of 1% SE on mungbean starch gel prevented the change of rupture characteristics during frozen storage. Texture profile analysis(TPA) characteristics revealed a significant change of the gel texture during frozen storage by showing an increase of hardness of the frozen stored gels compared to the freshly prepared gels with newly discovered fracturability, which resulted to show a large difference of gel texture by showing the disappearance of adhesiveness and large reduction of cohesivenes. The addition of 1% SE on mungbean starch gel prevented the change of TPA characteristics during frozen storage. Scanning electron micrographs showed that network structure of frozen stored gel was more rough than that of freshly prepared gel, and the addition of 1% SE on mungbean starch gel could suppress the breakdown of network structure. Thus the addition of 1.0% SE on mungbean starch gel was appropriate method for remaining gel characteristics during frozen storage.

• 한국방사선학회논문지
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• 제18권4호
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• pp.365-372
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• 2024

초음파 스캔에서 알코올 겔 적용 시 화질과 소독 효과 분석을 위해 초음파 겔과 알코올 함유량이 다른 소독용 알코올 겔을 변경 적용하여 실험하였다. 화질 분석은 ATS-539 다목적 팬텀을 이용하여 사각 구역, 축 및 측 방향 분해능, 민감도, 회색 조의 변화 항목을 비교해 보았고, 소독 효과 분석은 임상에서 사용 중인 볼록형 탐촉자 3개의 덮개 면을 swab을 통해 검체 수집과 24시간 증균배양한 후 gram stain과 identification을 하였다. 화질 분석 결과 알코올 함유량과 상관없이 모든 항목에서 초음파 겔 적용 영상과 차이가 없는 영상으로 구현되었으며, 모든 탐촉자에서 staphylococcus aureus, streptococcus, enterococcus 등의 병원균이 검출되었고 소독용 알코올 겔 적용으로 모두 사멸하였다. 초음파 검사 시 알코올 겔 적용은 화질 유지와 소독 효과 측면에서 의미가 있었으며 본 연구결과를 바탕으로 지속적인 후속 연구를 진행하고 보완하여시 제품화한다면 초음파 겔 대체재로 알코올 겔 적용은 화질뿐만 아니라 감염 예방 측면까지 고려할 수 있어 임상 검사 시 매우 유용할 것으로 판단된다.

• 한국식품조리과학회지
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• 제19권6호
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• pp.758-764
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• 2003

This study was performed to determine the quality characteristics of mixed polysaccharide gels made from kcarrageenan and locust bean gum with various kiwifruit content after freeze-thawing. The syneresis, rupture properties, TPA properties and sensory properties of the mixed polysaccharide gels with various kiwifruit contents after freeze-thawing were measured. The syneresis of the gel with various kiwifruit contents by freeze-thawing was not significantly different, whereas repeating freeze-thawing resulted in remarkable increase in the syneresis of the mixed polysaccharide gels with 5％, 20％ and 40％ kiwifruit. In terms of the rupture properties, the rupture stress, rupture energy and rupture strain decreased with increasing kiwifruit content after freeze-thawing. In terms of the TPA properties, the adhesiveness, hardness and chewiness increased and the cohesiveness decreased with increasing kiwifruit content after freeze-thawing. The rupture properties, springiness and cohesiveness of the gel by freeze-thawing were lower than those of the gel stored in the refrigerator. In contrast, the gumminess, hardness and chewiness of the gel after freeze-thawing were higher than those of the gel stored in the refrigerator. The results showed that the gel became crumbly and tough as a result of freeze-thawing. In the sensory evaluation, He overall acceptability of the gel after freeze-thawing was highest at the 30％ kiwifruit content, and differences in the sensory properties between the gel after freeze-thawing and that stored in the refrigerator were small. Therefore, mixed polysaccharide gels with kiwifruit after freeze-thawing could be useful despite the small decrease in quality.

• 한국식품영양학회지
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• 제20권4호
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• pp.399-405
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• 2007

The quality characteristics of breads made by adding levels of 30%, 60%, and 100% aloe gel were investigated. The 60% aloe gel sample had a larger dough volume than the control dough. Also, the loaf volume and specific volume of the bread made with 60% aloe gel were larger than those of the control bread. The pasting temperature increased gradually with the increasing amounts of substituted aloe gel as compared to wheat flour with water added$(66.5{\pm}12^{\circ}C)$; the wheat flour with 100% aloe gel had a pasting temperature of $90.7{\pm}1.1^{\circ}C$. Peak viscosity decreased gradually with increasing amounts of aloe gel when compared to the wheat flour with water added. Setback also was decreased gradually with the increasing amounts of aloe gel as compared to the wheat flour with added water. From the setback decrease it is suggested that the aloe controlled retrogradation of the bread during short-term storage. The crumb color of the bread made with the aloe gel was not significantly different to that of the control bread, and the color of the crumb was yellow-white. Bread hardness decreased gradually with increasing amounts of the substituted aloe gel. However, bread gumminess and chewiness increased gradually with increasing amounts of aloe gel. The springiness of the bread made with 100% aloe gel was lower than that of the control bread. With regard to flavor and taste, the bread made with 100% aloe gel produced a green-like odor and had a bitter taste. The mouth feel of the breads made with aloe gel was considered soft and moist. The overall acceptabilities of the breads made with 30% and 60% aloe gel were not significantly different from the control bread, but the bread made with 100% aloe gel had a green smell and bitter taste. Yet accordingly, the results indicate that functional and health products with improved quality could be developed by adding aloe gel to breads and cakes.

• 한국식품영양학회지
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• 제26권4호
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• pp.638-645
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• 2013

This study was conducted to investigate the effects of persimmon powder on the antioxidant activity and quality characteristics of mung bean starch gel. Mung bean starch gels were prepared with different amounts (0%, 1%, 3%, 5%, 7% and 9%) of persimmon powder. The antioxidant activity was estimated by the DPPH (1,1-diphenyl-2-picrylhydrazyl) free radical scavenging activity and by the total phenolic acid content in the persimmon powder and mung bean starch gel. For analyzing the quality characteristics, syneresis, pH, color, texture profile analysis, and sensory evaluations were measured. The syneresis in the control group was higher than that in the treated group, but the mung bean starch gel prepared with 9% persimmon powder was higher than that of the control group (p<0.001). The pH, b values, total phenolic acid content, and DPPH free radical scavenging activity of mung bean starch gels significantly increased with increasing persimmon powder (p<0.001), while the L values and a values of the mung bean starch gels significantly decreased with increasing persimmon powder (p<0.001). In the texture profile analysis, the mung bean starch gel with 9% persimmon powder showed significantly lower levels of chewiness, gumminess, and cohesiveness (p<0.05). The hardness and springiness of the mung bean starch gel did not show any significant difference. The consumer acceptability score for the mung bean starch gel prepared with 7% persimmon powder ranked significantly higher than that for the other groups in overall preference, appearance, flavor, and color (p<0.05). From these results;we suggest that persimmon powder is a good ingredient for increasing consumer acceptability and the functionality of mung bean starch gel.

• Bulletin of the Korean Chemical Society
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• 제18권4호
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• pp.379-384
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• 1997

High quality MCM-41 is prepared from a gel of molar composition SiO2:0.20 CTACl:0.18 TMAOH:25 H2O aged at 20 ℃ for 24 hours before crystallization lasting for 48 hours. The (110) and (200) peaks of XRD pattern of high quality MCM-41 are unusually well resolved and the FWHM (full-width-at-half-maximum) of the (100) peak is 0.13° for as-prepared MCM-41 and 0.21° for calcined one, which indicate well-developed crystals. The properties of the crystal depend on the source and concentration of the reactants and the gel aging time. There is no induction period in the course of the synthesis, which is conveniently monitored by pH measurement. Gel aging, during which a spatial distribution of silicate polyanions and micellar cations is established, is essential for preparing high quality MCM-41. Surfactants with the same cationic organic group but different counteranions change the crystallization behavior. Highly basic gel (pH=12.6) favours the lamellar product; the quality of MCM-41 is lower as insufficient TMAOH is available to dissolve the silica.

• 한국식생활문화학회지
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• 제23권4호
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• pp.499-506
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• 2008

This study was conducted to determine the quality characteristics of grape jellies for the elderly. The jellies contained sugar (control) or sugar derivative sweeteners (erythritol, isomaltooligosaccharide, sorbitol, and xylitol). Agar (0.31%) and $\kappa$-carrageenan (0.27%) were the gelling agents. The average age of the subjects participating in the acceptance test was 79. The lightness (L), redness (a), and yellowness (b) values of the agar gel with erythritol mostly decreased, indicating a darker and pale red color. The L and b values of the carrageenan gel with sugar derivative sweeteners increased, indicating brighter and yellowish color. The agar and carrageenan gels with sorbitol showed higher gelling and melting temperature, indicating that gelation occurred easily and did not easily melt. The agar and carrageenan gels with xylitol showed a low-melting temperature, indicating low stability with temperature change. The break-down rate of the agar and carrageenan gels with erythritol was low, whereas that of agar gel with sorbitol was relatively high despite its high melting temperature. Hardness, cohesiveness, gumminess, and chewiness of the gels with sugar derivative sweeteners decreased, and this tendency was most distinct with isomaltooligosaccharide in the agar gel and with sorbitol in the carrageenan gel. The rupture properties of the gel were the same as the hardness of the gel. Sensory acceptance of the agar gels with erythritol, sorbitol, isomaltooligosaccharide, and the carrageenan gel with erythritol was fairly high, whereas that of the agar gel with xylitol and the carrageenan gel with isomaltooligosaccharide and xylitol was low. The results show that sorbitol and erythritol are appropriate as sugar substitutes in grape jellies for the elderly about the acceptability and stability of the gels.

• Preventive Nutrition and Food Science
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• 제10권2호
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• pp.191-197
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• 2005

There exist two interesting phenomena in making seafood products from surimi. When salted surimi is kept at a constant low temperature $(4\~40^{\circ}C)$, its rheological properties change from sol to gel, which is called 'setting'. Seafood processors can exploit changes that occur during setting in preparation of surimibased products, because heating at high temperatures, after the pre-heating during the setting process, enhances the gel-strength of salted surimi. Contrarily, when salted surimi or low-temperature set gel is heated at moderate temperatures $(50\~70^{\circ}C)$, a deterioration of gel is observed. The phenomenon is termed 'modori'. In the modori temperature range, heat-stable cysteine proteinases such as cathepsin B, H, Land L-Iike hydrolyze the myosins responsible for gel-formation, resulting in gel weakening modori. This article reviews molecular events occurring during gel setting that improve the quality of surimi-based products, and inhibition of modori by applying proteinase inhibitors. Application of recombinant protein technology to surimi-based products is introduced and its prospects for practical use are discussed.

• 한국식품조리과학회지
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• 제8권1호
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• pp.21-25
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• 1992

8% 녹두전분 gel에서 관능검사의 cohesiveness는 기계적 검사의 어떤 특성치와도 유의적인 상관관계를 보이지 않았으나 관능검사의 shine, clarity, elasticity, hardness, overall quality는 기계적 검사의 특성치들과 유의적인 상관관계를 가진다고 분석 되었다. 10% 녹두전분 gel에서도 8% 녹두전분 gel과 비슷한 양상이었다. 또한 8% 및 10% 녹두전분 gel에서 관능검사의 shine은 기계적 검사의 L, a, b값과는 정의 상관관계이나 clarrty는 L, a, b값과는 부의 상관관계인 점으로 미루어 보아 관능적으로 윤기가 있고 불투명하다고 느낄수록 명도는 높고 적색 및 황색에 가까운 시료로 평가됨을 알 수 있었다. 이상의 결과에서 지방의 첨가는 녹두전분 gel의 texture에 상당한 영향을 미치는 것으로 평가되었고 2%의 지방을 첨가시킨 녹두전분 gel의 texture가 가장 좋은 것으로 평가되었다. 우리의 전통식품인 청포묵 제조시 texture를 좋게 하기 위한 지방의 첨가와 더불어 저장성 및 풍미를 높여줄 수 있는 다진 마늘의 첨가, 고추기름의 첨가와 영양배합 고려 및 간편성을 위한 탕평채 고명의 전분 gel에의 첨가등에 관한 연구를 계속하고자 한다.

• 한국식품영양학회지
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• 제21권2호
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• pp.184-189
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• 2008

Soybean powder is a readily available ingredient that is consumed daily as a functional food material. Furthermore, red Ginseng is an herb with various physiological effects. Therefore, in this study, we examined the physiochemical characteristics of Soybean Dasik samples prepared with different amounts of added red Ginseng gel, including Hunter's color values, mechanical characteristics, and sensory qualities. The results of each analysis are as follows. For the soybean Dasik stored at room temperature($20^{\circ}C$), luminance was reduced as the amount of added red Ginseng gel increased. In addition, Hunter's a and b values were significantly higher in Dasik samples that did not contain red Ginseng gel, as compared to those with increasing red Ginseng gel content. The mechanical properties of the Dasik were also measured at room temperature showing significant differences between samples(p<0.001) for hardness, springiness, cohesiveness, gumminess, and chewiness. In the sensory evaluation, 3 rounds of testing indicated that sweetness acceptance scores were significantly reduced(p<0.001) as the amount of added red Ginseng gel in the Dasik increased. Finally, overall quality was significantly different between the samples(p<0.001) and acceptance scores increased with increasing red Ginseng gel content.