• 한국산학기술학회논문지
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• 제11권7호
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• pp.2522-2527
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• 2010

본 연구의 목적은 초음파 처리 키토산과 메일라드 반응액 혼합물에 의한 tyrosinase 억제 활성과 항균력을 조사하고자 하였다. 감자로부터 tyrosinase를 분리하여 SDS-PAGE후 일반 단백질 염색과 tyrosinase 활성 염색을 행하여 tyrosinase를 확인하였다. 여러 가지 당 (glucose, fructose, galactose, xylose, arabinose or ribose)과 cystein과의 반응으로 생성된 메일라드 반응 산물의 tyrosinase 억제 활성을 비교한 결과, glucose과 cystein 반응으로 생성된 메일라드 반응 산물의 tyrosinase 억제 활성이 가장 높은 것으로 나타났다. 0.5% 아세트산에 녹인 1% 키토산을 시간별로 초음파 처리한 후 항균력을 조사한 결과 1 시간 이상 초음파 처리한 경우 E. coli 균주 와 S. aureus 균주에서 억제 활성을 보였다. 갈변 억제 활성과 항균력을 가진 혼합물 제조를 위하여 초음파 처리 키토산과 메일라드 반응액을 혼합비를 달리하여 조사한 결과 부피 비로 1 : 1 로 혼합한 경우가 tyrosinase 억제 활성과 항균력이 가장 효과가 높은 것으로 조사되었다.

• Preventive Nutrition and Food Science
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• 제22권3호
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• pp.211-215
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• 2017

The individual Maillard reactions of glucose, glucosamine, cyclohexylamine, and benzylamine were studied at a fixed temperature of $120^{\circ}C$ under different durations by monitoring the absorbance of the final products at 425 nm. Glucosamine was the most individually reactive compound, whereas the reactions of glucose, cyclohexylamine, and benzylamine were not significantly different from each other. Maillard reactions of reaction mixtures consisting of glucosaminecyclohexylamine, glucosamine-benzylamine, glucose-cyclohexylamine, and glucose-benzylamine were also studied using different concentration ratios under different durations at a fixed temperature of $120^{\circ}C$ and pH 9. Maillard reactions in the pairs involving glucosamine were observed to be more intense than those of the pairs involving glucose. Finally, with respect to the concentration ratios, it was observed that in most instances, optimal activity was realized, when the reaction mixtures were in the ratio of 1:1.

• Preventive Nutrition and Food Science
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• 제15권4호
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• pp.297-303
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• 2010

The present study compared the Maillard reaction products (MRPs) derived from aqueous and ethanolic fructoseglycine and its oligomer (dimer and trimer) solutions. The pH was lower in glycine (G) than in diglycine (DG) and triglycine (TG) in both aqueous and ethanolic solutions, but the pH difference between the DG and TG was not significant. MRPs derived from the DG had a greater absorbance at 294 and 420 nm in ethanolic solution than in an aqueous solution. In particular, the loss of sugar was higher in ethanolic solution than in aqueous solution. Enolization of fructose was observed in both aqueous and ethanolic MRP solutions; however, enolization was not observed for the G in aqueous MRP solutions. The glycine oligomer content in ethanolic MRP solutions remained higher than that in aqueous MRP solutions. Furthermore, neither diglycine nor triglycine were detected in the G aqueous or ethanolic MRP solutions, while triglycine was detected in both the DG aqueous and ethanolic MRP solutions. Absorption in the ultraviolet-visible (UV-Vis) spectra was higher with MRPs derived from the ethanolic solution than with those derived from the aqueous solution. MRPs derived from the DG in an ethanolic solution showed the highest absorption intensity.

• Membrane and Water Treatment
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• 제9권2호
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• pp.105-113
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• 2018

Maillard reaction products like melanoidins present in industrial fermentation wastewaters are complex compounds with various functional properties. In this work, novel ultrafiltration (UF) mixed matrix membrane (MMM) composed of polysulfone (PSF) and nanocomposites was prepared through a phase inversion process for the recovery of melanoidins. Nanocomposites were prepared with acid functionalized multiwalled carbon nanotubes (MWCNTs) as the reinforcing filler for chitosan-thermoplastic starch blend. Higher nanocomposites content in the PSF matrix reduced the membrane permeability and melanoidins retention indicating tighter membrane with surface defects. The membrane surface defects could be sealed with dilute polyvinyl alcohol (PVA) solution. The best performing membrane (1% nanocomposites in 18% PSF membrane sealed with 0.25% PVA coating) resulted in uniform melanoidins retention of 98% and permeability of 3.6 L/m2 h bar over a period of 8h. This demonstrates a low fouling PSF membrane for high melanoidins recovery.

• 한국식품과학회지
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• 제29권2호
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• pp.309-313
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• 1997

Maillard 반응 중 생성된 Maillard 반응생성물(MRPs)에 대한 세균의 생육 패턴을 조사하고자 반응표면분석을 적용하였으며, 세균의 생육배지에 MRPs를 첨가시 균의 생육에 대한 반응표면회귀식의 $R^{2}$는 Bacillus subtilis 및 Bacillus natto 균에서 각각 0.9544 및 0.9598였다(p<0.01). Bacillus subtilis의 생육에 관한 MRPs의 영향에서 Maillard 반응온도가 높고 반응시간이 긴 MRPs 첨가군은 생육이 감소하다가 반응시간이 $8{\sim}12\;hrs$ 범위 및 반응온도가 $150^{\circ}C$ 이상의 생성조건에서 크게 감소하였다. Bacillus natto균에 대한 생육에서는 Maillard 반응시간의 영향을 거의 받지 않았고, $150^{\circ}C$보다 낮은 반응온도에서는 온도가 낮고 용매 pH가 낮아질수록 생성된 MRPs에 대한 균의 생육이 증가하였으나 $150^{\circ}C$ 이상에서는 pH의 영향을 받지 않고 온도가 증가할수록 생성된 MRPs에 대한 균의 생육이 감소하였다. 능선분석에서 Bacillus subtills 균에 대한 생육은 $159.10^{\circ}C$, 9.69시간 및 용매 pH 12.21에서 생성된 MRPS가 가장 생육억제 효과가 컸으며, Bacillus natto균의 생육은 $169.94^{\circ}C$, 9.22시간 및 용매 pH 9.66에서 생성된 MRPs에 의해 가장 크게 억제되었다.

• 한국수산과학회지
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• 제27권2호
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• pp.133-139
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• 1994

식품의 가공 저장 및 조리 중에 일어나는 식품성분간의 반응 중 대표적인 반응으로 알려져 있는 Maillard 반응생성물의 돌연변이원성에 대한 그 억제 기구를 밝히기 위하여 glucose-arginine계 및 glucose-lysine${\cdot}$HCl계 Maillard 반응 생성물에 일상 생활에서 많이 섭취하고 있는 해조류 및 야채류의 수용성 추출물을 첨가하여 그 억제효과를 조사하였고, 아울러 이들 수용성추출물의 가열($100^{\circ}C$, 10분)에 따른 억제효과의 영향에 대해 조사 검토하였다. 그 결과, 실험에 사용한 해조류 및 야채류 수용성 추출물 전부가 돌연변이원성 억제효과를 나타내었고, 특히 양배추, 파, 산초, 및 청각에 있어서 억제효과가 높게 나타났다. 가열한 경우, 야채류의 돌연변이원성 억제효과는 감소하였으나 해조류는 크게 영향을 받지 않았다. 이 결과로 미루어 보아 당-아미노산계 Maillard 반응생성물의 돌연변이원성 억제에 해조류 및 야채류 추출물에 존재하는 환원성 물질, 고분자 물질 catalase 및 peroxidase와 같은 효소 등이 일조를 하는 것으로 나타났다.

• 한국식품과학회지
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• 제26권6호
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• pp.781-786
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• 1994

HVP를 기본 원료로 하여 몇몇 반응 전구물질을 첨가하여 여러 가지 반응 조건에 따라 meatlike flavor를 제조하였다. pH와 온도는 반응액의 갈변화도에 큰 영향을 미쳐, pH와 온도가 높을수륵 갈변화 속도는 빨라졌다. 반응액에 잔존하는 환원당과 유리 아미노산은 반응 1시간까지 급격히 감소하였으나 반응 온도의 영향은 거의 받지 않았다. 각 아미노산의 경우, glutamic acid와cysteine은 반응 시간이 경과함에 따라 감소하나, glycine과 methionine은 거의 변화가 없었다. Maillard 반응을 통해 생성되는 meatlike flavor외 향기 성분은 49종이 통정되었으며, 이중에 3-methyl butanal, 2-methyl tetrahydrothiophen-3-one, 3,4-d imethyl thiophene, 2,4-dimethyl thiagole 둥의 잘 알려진 natural meat flavor 성분들도 포함되어 있었다. $120^{\circ}C$에서 제조된 반응액을 관능 평가한 결과, 반응 1시간대의 반웅액이 5% 유의수준에서 구수한 맛이 가장 강하였고, 이미가 가장 적었다. 이상의 결과에서, 본 반응 system에서는 반웅 1 시간내에 대부분의 Maillard 초기 반응이 일어나고, 그이후, 반응이 진행될수록 구수한 맛을 내는 성분은 줄어들고, 이미를 나타내는 성분이 증가한다고 추정되었다.

• 한국축산식품학회지
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• 제40권1호
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• pp.44-54
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• 2020

The purpose of the present study was to evaluate the sensory and instrumental quality of thawed beef steak prepared by searing and oven cooking. Beef purchased in the local market was divided into two groups; one group was cooked in a 180℃ oven until the internal temperature reached 60℃, and the other group was oven cooked until 35℃, then cooked in a 250℃ pan until the internal temperature reached 60℃. Despite a noticeable change in appearance due to the high temperature of the searing, there was no significant difference in juiciness, water content, and cooking loss between the searing-cooked and the oven-cooked steaks. However, in searing cooking, both scores of overall flavor and roast meat flavor were significantly higher than those of oven cooking. In the searing-cooked steak, the reducing sugar, which is a reactant of the Maillard reaction, was lower and Maillard-reaction products were higher than oven-cooked steak. From our results, it can be concluded that searing does not improve juiciness of the steak, but improves the flavor of beef steak due to higher levels of Maillard reaction products.

• 한국연초학회지
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• 제10권2호
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• pp.123-130
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• 1988

The volitile compounds Produced from the Maillard reaction of D-glucose and DL-alanine or DL-$\alpha$-aminobutyric acid using water or propylene glycol as a reaction amdeum were analysed by gas chromatofiraphy and mass spectrometry. From two kinds of reaction products in water 18 compounds were identified. The major compounds in a reaction product of glucose with alanine were 5-hydroxy methyl-2-furfural, 2-acetyl pyrrole and 2-formyl-5-methyl pyrrole, and those in a reaction product of glucose with $\alpha$-aminobutyric acid were 2-ethyl crotonaldehyde and 2-methyl-3, 5-dihydroxy-4H-pyran-4-one including the above 3 compounds. From two kinds of reaction products in propylene glycol solution, 35 compounds were identified. The major compounds in a reaction product of glucose with alanine were alkyl pyraainef, 2-methyl furfuryl alcohol and 2-acetyl pyrrole, and those in a reaction product of glucose with $\alpha$-aminobutyric acid were propionaldehyde PGA, 2-ehtyl crotonaldehyde, 2-acetyl pyrrole and 2-acetyl-5-ethyl furan.

• Food Science and Biotechnology
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• 제17권4호
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• pp.839-841
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• 2008

The mutagenicity after heating of different sugars (glucose, fructose, galactose, and tagatose) on the non-enzymatic browning reaction in different sugars and glycine model system was investigated. The model system containing 0.2 M glycine and 0.2 M of different sugars in 10 mL water was heated at $150{\pm}5^{\circ}C$ for 30 min. After heating, degree of non-browning reaction intensity and mutagenicity using Salmonella typhimurium TA 98 were examined. Heated glycine model systems containing different sugars increased their mutgenicity ranged from 30 to 372 revertant colonies. After heating for 40 min, mutagenicity was achieved with glycine model systems containing 4 different sugars with by 145, 356, 206, and 369 revertants per plate, respectively. The glycine model systems containing fructose or tagatose were significantly (p<0.05) higher mutagenic activity than glycine model systems containing glucose or galactose after 40 min of heating. The linear regression between Maillard reaction intensity and mutagenic activities (slope=32.38, $R^2=0.93$) indicates that mutagenicity could be fully ascribed to Maillard reaction products.