• Journal of the Korean Wood Science and Technology
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• 제37권4호
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• pp.388-396
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• 2009

본 연구에서는 두부비지 가수분해물과 페놀수지로 조제된 마루판 화장용 접착제의 접착성능을 확인하기 위하여 수행하였다. 먼저 두부비지를 황산과 수산화나트륨으로 화학적으로 개량한 후 가교제로 phenol formaldehyde (PF) prepolymer와 혼합하여 접착제를 조제하였는데, 이 접착제는 고형분 함량을 기준으로 35%의 황산 가수분해물(AC), 35%의 수산화나트륨 가수분해물(AK) 그리고 30%의 PF로 조제하였다. 이렇게 조제된 접착제를 고밀도섬유판에 $300g/m^2$의 비율로 도포한 후 참나무 무늬목을 접착시켜 $7kg/m^2$의 압력으로 $120^{\circ}C$에서 열압하여 마루판을 제조하였다. 제조된 마루판에 대하여 formaldehyde/phenol 몰비(1.8, 2.1, 2.4), 퇴적시간(0분, 10분, 20분), 열압시간(90초, 120초)이 평면인장강도, 준내수 박리율, 포름알데히드 방산량에 미치는 영향에 대해 조사하였다. 두부비지 접착제를 이용하여 제조된 목질마루판의 평면인장강도는 KS 규격의 최소값을 상회하였으며, 대부분의 포름알데히드 방산량 값은 KS 규격의 E0 기준에 근접하는 것으로 나타났다. 따라서 두부비지 접착제가 마루판 화장용 접착제로 사용될 수 있다는 가능성을 보여 주었으나, 상용화를 위하여 내수성의 향상과 포름알데히드 방산량의 저감을 위한 연구가 필요할 것으로 생각한다.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2010년도 정기총회 및 추계학술발표회
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• pp.14-14
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• 2010

Vitamin C (ascorbic acid) is an essential component for collagen biosynthesis and also for the proper functioning of the cardiovascular system in humans. Unlike most of the animals, humans lack the ability to synthesize ascorbic acid on their own due to a mutation in the gene encoding the last enzyme of ascorbate biosynthesis. As a result, vitamin C must be obtained from dietary sources like plants. In this study, we have developed two different kinds of transgenic potato plants (Solanumtuberosum L. cv. Taedong Valley) overexpressing strawberry GalUR and mouse GLoase gene under the control of CaMV 35S promoter with increased ascorbic acid levels. Integration of the these genes in the plant genome was confirmed by PCR and Southern blotting. Ascorbic acid(AsA) levels in transgenic tubers were determined by high-performance liquid chromatography(HPLC). The over-expression of these genes resulted in 2-4 folds increase in AsA intransgenic potato and the levels of AsA were positively correlated with increased geneactivity. The transgenic lines with enhanced vitamin C content showed enhanced tolerance to abiotic stresses induced by methyl viologen(MV), NaCl or mannitol as compared to untransformed control plants. The leaf disc senescence assay showed better tolerance in transgenic lines by retaining higher chlorophyll as compared to the untransformed control plants. Present study demonstrated that the over-expression of these gene enhanced the level of AsA in potato tubers and these transgenics performed better under different abiotic stresses as compared to untransformed control. We have also investigated the mechanism of the abiotic stress tolerance upon enhancing the level of the ascorbate in transgenic potato. The transgenic potato plants overexpressing GalUR gene with enhanced accumulation of ascorbate were investigated to analyze the antioxidants activity of enzymes involved in the ascorbate-glutathione cycle and their tolerance mechanism against different abiotic stresses under invitro conditions. Transformed potato tubers subjected to various abiotic stresses induced by methyl viologen, sodium chloride and zinc chloride showed significant increase in the activities of superoxide dismutase(SOD, EC 1.15.1.1), catalase, enzymes of ascorbate-glutathione cycle enzymes such as ascorbate peroxidase(APX, EC 1.11.1.11), dehydroascorbate reductase(DHAR, EC 1.8.5.1), and glutathione reductase(GR, EC 1.8.1.7) as well as the levels of ascorbate, GSH and proline when compared to the untransformed tubers. The increased enzyme activities correlated with their mRNA transcript accumulation in the stressed transgenic tubers. Pronounced differences in redox status were also observed in stressed transgenic potato tubers that showed more tolerance to abiotic stresses when compared to untransformed tubers. From the present study, it is evident that improved to lerance against abiotic stresses in transgenic tubers is due to the increased activity of enzymes involved in the antioxidant system together with enhanced ascorbate accumulated in transformed tubers when compared to untransformed tubers. At moment we also investigating the role of enhanced reduced glutathione level for the maintenance of the methylglyoxal level as it is evident that methylglyoxal is a potent cytotoxic compound produced under the abiotic stress and the maintenance of the methylglyoxal level is important to survive the plant under stress conditions.

• 한국식품조리과학회지
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• 제9권1호
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• pp.43-51
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• 1993

Buckwheat protein isolate was tested for the effects of pH, addition of sodium chloride and heat treatment on solubility, emulsion capacities, emulsion stability, surface hydrophobicity, foam capacities and foam stability. The solubility of buckwheat protein isolate was affected by pH and showed the lowest value at pH 4.5, the isoelectric point of buckwheat protein isolate. The solubility significantly as the pH value reached closer to either ends of the pH, i.e., pH 1.0 and 11.0. The effects of NaCl concentration on solubility were as follows; at pH 2.0, the solubility significantly decreased when NaCl was added; at pH 4.5, it increased above 0.6 M; at pH 7.0 it increased; and at pH 9.0 it decreased. The solubility increased above $80^{\circ}C$, at all pH ranges. The emulsion capacity was the lowest at pH 4.5. It significantly increased as the pH approached higher acidic or alkalic regions. At pH 2.0, when NaCl was added, the emulsion capacity decreased, but it increased at pH 4.5 and showed the maximum value at pH 7.0 and 9.0 with 0.6 M and 0.8 M NaCl concentrations. Upon heating, the emulsion capacity decreased at acidic pH's but was maximised at pH 7.0 and 9.0 on $60^{\circ}C$ heat treatment. The emulsion stability was the lowest at pH 4.5 but increased with heat treatment. At acidic pH, the emulsion stability increased with the increase in NaCl concentration but decreased at pH 7.0 and 9.0. Generally, at other pH ranges, the emulsion stability was decreased with increased heating temperature. The surface hydrophobicity showed the highest value at pH 2.0 and the lowest value at pH 11.0. As NaCl concentrationed, the surface hydrophobicity decreased at acidic pH. The NaCl concentration had no significant effects on surface hydrophobicity at pH 7.0, 9.0 except for the highest value observed at 0.8 M and 0.4 M. At all pH ranges, the surface hydrophobicity was increased, when the temperature increased. The foam capacity decreased, with increased in pH value. At acidic pH, the foam capacity was decreased with the increased in NaCl concentration. The highest value was observed upon adding 0.2 M or 0.4 M NaCl at pH 7.0 and 9.0. Heat treatments of $60^{\circ}C$ and $40^{\circ}C$ showed the highest foam capacity values at pH 2.0 and 4.5, respectively. At pH 7.0 and 9.0, the foam capacity decreased with the increased in temperature. The foam stability was not significantly related to different pH values. The addition of 0.4 M NaCl at pH 2.0, 7.0 and 9.0 showed the highest stability and the addition of 1.0 M at pH 4.5 showed the lowest. The higher the heating temperature, the lower the foam stability at pH 2.0 and 9.0. However, the foam stability increased at pH 4.5 and 7.0 before reaching $80^{\circ}C$.

• 한국식품조리과학회지
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• 제7권3호
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• pp.13-20
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• 1991

율무와 염주 단백질의 식품 이화학적 특성을 알아보고자 율무쌀, 현염주 및 비교시료로서 쌀의 3가지 시료를 가지고 실험 한 결과는 아래와 같다. 1. 분리단백질의 분포는 율무쌀의 경우 알부민, 글로불린, 글리아딘 및 글루텔린의 비율이 각각 17.4:19.6:55.2:77%였으며, 현염주는 12.6:62.2:4.2:21.0% 였고, 백미는 14.2:57.4:0.77:27.8% 였다. 그러나 단백질의 분획과정에 변성으로 인하여 글로불린, 글루텔린의 손실이 있었고, 추출율이 상당히 낮아서 3.4∼13.0% 정도였으므로 단백질의 추출방법은 더 연구되어야 할 것으로 사료된다. 2. 산성 및 염기성 조건에서 실시한 Polyacrylamide gel electrophoresis의 결과, 율무쌀과 현염주의 단백질 분획들은 유사한 전기영동 패턴을 나타냈으며, 백미의 경우는 이들과 다른 전기영동 패턴을 나타냈다. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis의 전기 영동상은 율무쌀과 현염주 간에 band의 분포가 매우 유사하였으나, 그 조성비율에 있어서는 다소 차이가 있었다. 쌀의 경우는 이들과 뚜렷이 다르게 나타났는데, 특히 g1iadin의 경우 율무쌀과 현염주에서는 분자량 10,000∼30,000사이에 여러 개의 띠가 확인되었으나 백미에서는 분자량 12,000 정도에 해당하는 하나의 띠만이 확인되었다. 따라서 율무와 염주는 식물학적으로 밀접한 관계에 있음이 확인되었으며, 이들과 백미단백질의 전기영동상의 차이는 유전적인 인자의 차이에 의한 것으로 보여진다.

• 한국축산식품학회지
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• 제25권1호
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• pp.103-120
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• 2005

During the 1970s, concern arose that cured meats contained high levels of residual nitrite and preformed nitrosamines. Therefore, the search for alternatives and alternative approaches to the use of nitrite have been still continued, however no complete alternative for nitrite has yet been identified. Recently, it was publicized in Korea that nitrite-containing meat products would be detrimental to health, about which consumers have been seriously concerned. Therefore, this study was carried out to inform the consumer of the safety status of nitrite and thereby to lead proper consumption of meat products. For assessing the safety of nitrite, data regarding the regulation for use, metabolism in human body, and dietary intake amounts of nitrite were collected and analyzed. The mean intake level of nitrite for Korean per capita was recently reported to be not more than 1% of ADI set by JECFA. On the contrary, a calculation indicated that the daily nitrite intake per capita from saliva by ingestion of vegetables in Korea would be about 300-fold higher than that from cured meats. In consideration of the low consumption amount of meat products per capita of Korean, that is, at least one fifth, compared to European and American, there is no particular reason to concern about the impairment of health by nitrite intake from meat products for Korean. However, any effort for the reduction of residual nitrite content in cured meats should be given with an idea to minimize the intake of nitrite even from the minor source.

• 한국축산식품학회지
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• 제22권3호
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• pp.206-211
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• 2002

활성탄 0.9%와 오메가 3계열을 다량 함유한 어유를 급여 수준(0, 1, 2, 4 %)에 따라 5주간 급여하면서 사료효율을 측정하였으며, 5주째 도계하여 혈액 콜레스테롤, 일반성분, 무기물을 분석하고 pH의 변화는 4$\pm$1'E의 냉장고에 진공포장하여 저장하면서 10일간 조사하였다. 사료효율은 2, 3주는 약간 증가하였으나 4, 5주째는 증가하지 않았고, 혈액콜레스테롤은 어유 첨가구에서 대조구에 비하여 낮아지고 있었다. (p<0.05). 일반성분은 활성탄과 어유 첨가구에서 큰 차이가 없었고(p>0.05), 단백질은 흉심부위가 대퇴부위보다 약간 많았다. p보는 저장기간이 경과하면서 전 처리구에서 유의적으로 높아지고 있었으며(p<0.05), 활성탄과 어유 첨가구에서는 높은 경향이었고, 무기물은 활성탄 첨가구가 대조구보다 많았으며 활성탄과 어유를 함께 급여한 구는 어유 첨가량이 많을수록 무기물 함량은 약간 적었고, 부위별로는 흉심부위가 대퇴부위보다 많았다.

• 한국축산식품학회지
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• 제22권3호
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• pp.259-266
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• 2002

본 연구는 토양으로부터 egg shell membrane(ESM)을 분해하는 미생물 strain 109를 분리 동정하였으며, 분리균이 생성한 keratinase를 정제하고 그 특성을 확인하였다. Strain 109는 16S rDNA 결과 99.9%의 상동성을 가지고 Bacillus licheniformis로 확인되었고, 3% ESM을 함유한 Nitrobacter 203배지에서 B. licheniformis 109를 접종하여 1주일간 배양하였을 때 ESM의 분해율은 약 15%였다. E. licheniformis 109가 생성한 keratinase를 정제하여 SDS-PA-GE로 분자량을 측정한 결과 약 65,000 Dalton이었으며 0.1% gelatin이 함유된 SDS-PAGE에 의해 효소 활력을 확인할 수 있었다. 정제한 keratinase의 PH에 따른 활성과 안정성은 pH 9.0에서 활성이 가장 높았으며 pH 9.0이상에서 안정하였다. 또한, 5$0^{\circ}C$에서 효소활성이 가장 높았으며 온도 안정성은 2$0^{\circ}C$에서 5$0^{\circ}C$까지 안정하였고, 7$0^{\circ}C$ 이상에서는 약 50%의 활력을 상실하였다. keratinase 활성에 금속 이온이 미치는 영향은 CuCl2와 ZnCl2에 의해 약 50% 정도가 저해되었으나 FeSO4에 의해서는 1mM일 때 약 11%, 10mM일 때 약 33%가 증가하였다. 그리고 PMSF에 의해 효소활성이 저해되는 것으로 나타나 B. licheniformis 109로부터 정제한 keratinase는 serine-protease로 사료된다.

• 한국축산식품학회지
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• 제32권1호
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• pp.84-90
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• 2012

본 연구는 인산염의 첨가와 침지가 저지방 소시지의 저장기간에 따른 품질 및 저장성을 평가하기 위해 실시하였다. 저지방 소시지에 0.4% STPP를 첨가하고, 10% TSP 용액에 침지함에 따라 pH값이 증가하였다. STPP의 첨가에 따라 적색도가 감소하는 반면, 10% TSP 침지구의 황색도는 증가하였다(p<0.05). 저장기간이 경과함에 따라 명도는 유의적으로 감소한 반면 적색도는 유의적으로 증가하였다(p<0.05). 약 5 Log CFU/g로 접종된 Listeria monocytogenes(LM) 균수는 저장기간이 경과함에 따라 4주에 8.03-8.22 Log CFU/g로 나타났고 8주에는 7.89 Log CFU/g로 약간 감소했다. 접종된 저지방 소시지의 저장 중 총균과 LM균의 성장은 10%의 TSP 침지에 의해 pH의 증가로 유의적으로 더 촉진된 것으로 판단된다. 이와 같은 결과를 종합하면 인산염 첨가 및 침지는 pH와 색도(명도와 황색도)에 영향을 주었으며 저장기간 중 뚜렷한 항균 및 항산화 효과는 없었다.

• 한국축산식품학회지
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• 제40권5호
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• pp.689-698
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• 2020

The aim of study was to scrutinize the physicochemical and protein profile of milk obtained from local Pakistani breeds of milch animals such as Nilli-Ravi buffalo, Sahiwal cow, Kajli sheep, Beetal goat and Brela camel. Physicochemical analysis unveiled maximum number of total solids and protein found in sheep and minimum in camel. Buffalo milk contains the highest level of fat (7.45%) while camel milk contains minimum (1.94%). Ash was found maximum in buffalo (0.81%) and sheep (0.80%) while minimum in cow's milk (0.71%). Casein and whey proteins were separated by subjecting milk to isoelectric pH and then analyzed through sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE). The results showed heterogeneity among these species. Different fractions including α_S1, α_S2, κ-casein, β-casein and β-lactoglobulen (β-Lg) were identified and quantitatively compared in all milk samples. Additionally, this electrophoretic method after examining the number and strength of different protein bands (α_S1, α_S2, β-CN, α-LAC, BSA, and β-Lg, etc.), was helpful to understand the properties of milk for different processing purposes and could be successfully applied in dairy industry. Results revealed that camel milk was best suitable for producing allergen free milk protein products. Furthermore, based on the variability of milk proteins, it is suggested to clarify the phylogenetic relationships between different cattle breeds and to gather the necessary data to preserve the genetic fund and biodiversity of the local breeds. Thus, the study of milk protein from different breed and species has a wide range of scope in producing diverse protein based dairy products like cheese.

• 한국식품과학회지
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• 제29권4호
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• pp.671-679
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• 1997

국내에서 재배, 유통되고 있는 약초 일반성분 및 무기질 함량을 분석하였다. 건물기준으로 조회분은 오가피, 쇠비름, 사상자가 각각 22.4, 20.6, 15.0%로 다량 함유하고 있었고, 조단백은 산조인, 택사, 정력자, 결명자가 각각 39.9, 30.6, 28.8, 27.5%로 다량 함유하고 있었다. 조지방은 산조인, 창이자, 소자, 동과자 순으로 각각 27.9, 24.0, 22.8, 22.4%, 조섬유는 만형자, 영지, 송절, 접골목 순으로 각각 59.5, 53.9, 46.4, 41.2% 그리고 가용성 무질소물은 복령, 천마, 초용담, 지황이 각각 91.2, 87.9, 86.3, 86.0%로 다량 함유하고 있는 것으로 분석되었다. 인은 상기생, 동규자, 연자육이 각각 100 g당 1,485.9, 1,149.5, 985.0 mg로 다량 함유한 것으로 분석되었고, 마그네슘은 삼백초, 단삼, 칡이 각각 728.0, 582.0, 464.9 mg로 다량 함유하였다. 칼슘은 승마, 오가피, 건칠이 각각 8,506.6, 7,106.5, 3,010.2 mg로 측정되었으며, 칼륨은 송이, 어성초, 우슬이 각각 5,613.5, 5,353.5, 4,665.7 mg였다. 또한 나트륨의 경우 육종용, 두충, 매실이 각각 2,064.5, 595.3, 291.4 mg, 철은 대계근, 초용담, 속단이 각각 307.4, 233.0, 207.6 mg로 나타났다.