• 한국식품영양과학회지
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• 제44권5호
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• pp.673-680
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• 2015

본 연구에서는 우렁쉥이 껍질 유래 다당류의 기능성식품 소재로의 활용 가능성을 확인하기 위하여 조다당류의 분리 및 정제를 통해 획분을 얻었으며 다양한 면역증강 효과를 확인하였다. 건조된 조다당류를 DEAE-sepharose CL-6B를 이용하여 크로마토그래피한 후 총당 및 uronic acid 함량을 분석한 결과, 증류수로 용출되는 비흡착 획분(APF-I, fraction No. 11~17)과 흡착된 후 NaCl 용액에 의해 용출되는 획분(APF-II, fraction No. 22~37)을 얻었다. 정제된 APF-I 및 APF-II의 이화학적 특성으로 총당 함량은 각각 66.62%, 27.03%, uronic acid 함량은 47.53%, 15.87%, hexosamine 함량은 16.62%, 46.79% 및 단백질 함량은 2.43%, 4.94%로 나타났다. APF-I 및 APF-II에 대해 RAW 264.7 세포에 처리하여 독성을 평가한 결과 $5{\mu}g/mL$ 농도까지 유의적으로 세포사멸이 나타나지 않아 세포독성이 없음을 확인할 수 있었다. Nitric oxide 생산량은 APF-I이 $5{\mu}g/mL$ 농도에서 $22.23{\mu}m$ 함량을 나타내어 LPS 대비 73.48%로 타 구간에 비해 높은 생성량을 나타내었으며, cytokine 생성량(TNF-${\alpha}$ 및 IL-6) 또한 APF-I $5{\mu}g/mL$ 농도에서 각각 LPS 대비 104%, 100.1%를 나타내어 LPS와 유사한 생성량을 나타내었다. Polymerase chain reaction을 통한 면역관련 유전자 발현 분석 결과, iNOS, COX-2, TNF-${\alpha}$, IL-6에서 APF-I 구간에서 LPS 처리군 보다 높은 발현량을 나타내어 면역증강을 목적으로 한 기능성식품 개발에 활용 가능하다고 사료된다.

• 한국잡초학회지
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• 제14권1호
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• pp.56-61
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• 1994

귀리의 근단(根端) 조직(組織)에 alachlor $1{\times}10^{-4}$ M 처리후(處理後) 음(陽)이온의 과산화(過酸化) 효소(酵素)를 유출(抽出)하여 에탄올과 이온 교환 수지인 DEAE-celluose 및 CM-sephadex를 이용하여 정제(精製)한 결과(結果), 약 30배의 정제율(精製率)을 얻었으며, 3개의 음(陽)이온을 띤 동위(同位) 효소(酵素)가 존재(存在)하였다. 귀리 근단(根端)에 존재(存在)하는 주(主)된 과산화(過酸化) 효소(酵素)(B fraction)는 최종(最終) 정제후(精製後) 전체(全體) 동위과산화(同位過酸化) 효소중(酵素中) 65%를 차지하였으며, 37배로 정제(精製)되었다. SDS-PAGE를 이용하여 B부분을 전개(展開)한 결과(結果), 단일(單一) band를 얻었으며, 이 때 분자량(分子量)은 약 42,500으로 추산(推算)되었다. 기내에서 동위(同位) 과산화(過酸化) 효소(酵素)의 활성(活性)은 IAA에 의하여 감소(減少)되었다. 50unit 동위(同位) 과산화(過酸化) 효소(酵素)를 귀리에 처리시(처리處理時) 무처리구(無處理區)에 비하여 근단(根端)의 세포분제(細胞分製)은 70.2%, 초엽의 세포신장(細胞伸長)은 54.2% 억제(抑制)되는 현상을 보였다.

• 한국식품과학회지
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• 제43권3호
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• pp.277-281
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• 2011

본 연구는 과실류에 잔류하는 ETU 분석을 위해 LC/APCI-MS를 이용하여 신속 정확한 분석법 검증을 실시하였다. 시료 중 존재하는 ETU 성분 추출로 사용된 용매는 $CH_2Cl_2$이며, 시료 전처리 시 cys-HCl 0.4 g, $Na_2CO_34g$을 사용할 때 최적의 회수율을 나타냈다. 분석 시 $C_{18}$ column으로 분리되어 나온 ETU의 머무름 시간대에서 어떠한 간섭현상도 보이지 않았으며 232 nm에서 최고의 흡수파장을 보였다. 귤 시료에 ETU를 첨가한 결과값의 직선성은 적합한 것으로 나타났다($R^2$=1). 정밀성과 정확성은 0.05-1.0 mg/kg에서 RSD$\leq$10%이며, 회수율은 평균 80% 이상의 결과를 보였다. 배, 포도, 바나나의 회수율도 마찬가지로 80% 이상으로 나타났다. 본 실험방법으로 시중에 유통중인 과실류를 구입하여 모니터링을 한 결과 ETU는 오렌지 과피에서 4건이 검출되었고 최고 잔류치는 $73.6{\mu}g/kg$ 이었다. 귤 과피는 3건 검출 되었고 최고 잔류치는 $29.8{\mu}g/kg$이었다. 본 연구의 과실류에 잔류하는 ETU 분석법은 시료 전처리에 필요한 시간을 줄일 수 있으며 전처리 단계를 간소화함으로써 오염도를 줄였다. 기존에 발표된 논문에 비해 전처리 시간은 약 20분 정도 소요되며, 분석 시 재현성, 정밀성 등을 고려할 때 과실류에 존재하는 ETU 분석법에 적합한 것으로 사료된다.

• 한국대기환경학회지
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• 제34권4호
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• pp.554-566
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• 2018

The rice husk contains nutrients which can be easily utilized by microorganisms, and also has a water retaining ability, which played a crucial part in enabling it to become a biofilter media. In this study, we evaluated the applicability of rice husk pellet bio-scrubber as a microbiological carrier. The pelletization experiment of rice husk as a biological media was performed using PVA and EVA binder. Also, the feasibility tests of rice husk as a biological media for odor removal were carried out in order to know whether rice-husk contains useful components as a media for microbiological growth or not. Lastly, a combined test for odor gas absorption and biological oxidation was conducted using a lab scale bio-filter set-up packed with rice-husk pellets as wet-scrubber. The major components of the rice husk were carbon, hydrogen, nitrogen, and oxygen, while carbon acted as the main ingredient which comprised up to 23.00%. The C : N : P ratio was calculated as 45 : 1 : 2. Oxygen uptake rate, yield and decay rate of the rice husk eluent was calculated to be $0.0049mgO_2/L/sec$, 0.24 mgSS/mgCOD and 0.004 respectively. The most stable form of rice husk pellets was produced when the weight of the rice husk, EVAc, PVAc, and distilled water was 10 : 2 : 0.2 : 10. The prepared rice husk pellets had an apparent density of 368 g/L and a porosity of 59.00% upon filling. Dry rice husks showed high adsorption capacity for ammonia gas but low adsorption capacity for hydrogen sulfide. The bio-filter odor removal column filled with rice husk pellets showed more than 99.50% removal efficiency for NH3 and H2S gas. Through the analysis of circulation water, the prime removal mechanism is assumed to be the dissolution by water, microbial nitrification, and sulfation. Finally, it was confirmed that the microorganisms could survive well on the rice husk pellets, which provided them a stable supply of nutrients for their activity in this long-term experiment. This adequate supply of nutrients from the rice husk enabled high removal efficiency by the microorganisms.

• 대한화장품학회지
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• 제36권2호
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• pp.129-136
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• 2010

본 연구에서는 산거울 추출물의 항주름 활성을 연구하기 위하여 항산화, 엘라스타제 활성 억제, Matrix metalloproteinase-1 (MMP-1) mRNA 발현 및 단백질의 생성 억제 관련 실험을 진행하였다. 산거울의 뿌리부분을 95 % 에탄올로 추출하고 유기 용매로 분획하여 각 추출물 분획물에 대한 항산화 활성과 엘라스타제 억제 효능을 측정한 결과, EtOAc 분획이 각각 SC50=4.89 ${\mu}g/mL$, IC50=23.5 ${\mu}g/mL$ 로 가장 우수한 결과를 나타내었다. 따라서 활성이 가장 좋은 EtOAc 분획물로 부터 실리카겔 컬럼 크로마토그래피를 이용하여 활성물질을 분리하고, 분리된 물질이 ${\alpha}$-viniferin임을 분광학적 분석결과로 확인하였다. RT-PCR을 이용한 MMP-1 mRNA 발현능 평가에서 EtOAc 분획물과 ${\alpha}$-viniferin은 각각 50 ~ 60 % (10 ~ 100 ${\mu}g/mL$), 약 60 ~ 75 % (0.5 ~ 2 ${\mu}g/mL$)의 저해효과를 나타내었으며, Western-blot을 이용한 MMP-1 단백질 생성을 평가한 결과에서 역시 EtOAc 분획물과 ${\alpha}$-viniferin은 같은 농도에서 각각 50 ~ 65 %와 55 ~ 65 % 저해 효과를 나타내었다. 결론적으로, ${\alpha}$-viniferin을 함유한 산거울의 EtOAc 분획층의 주름 개선용 기능성 화장품 개발을 위한 소재로 개발 가능성을 확인하였다.

• Computers and Concrete
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• 제31권4호
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• pp.337-348
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• 2023

Shear wall is commonly used as a lateral force resisting system of concrete mid-rise and high-rise buildings, but it brings challenges in providing relatively large space throughout the building height. For this reason, the structure system where the upper structure with bearing, non-bearing and/or shear walls that sits on top of a transfer plate system supported by widely spaced columns at the lower stories is preferred in some regions, particularly in low to moderate seismic regions in Asia. A thick reinforced concrete (RC) plate has often been used as a transfer system, along with RC transfer girders; however, the RC plate becomes very thick for tall buildings. Applying the post-tensioning (PT) technique to RC plates can effectively reduce the thickness and reinforcement as an economical design method. Currently, a simplified model is used for numerical modeling of PT transfer plate, which does not consider the interaction of the plate and the upper structure. To observe the actual behavior of PT transfer plate under seismic loads, it is necessary to model whole parts of the structure and tendons to precisely include the interaction and the secondary effect of PT tendons in the results. This research evaluated the seismic behavior of shear wall-type residential buildings with PT transfer plates for the condition that PT tendons are included or excluded in the modeling. Three-dimensional finite element models were developed, which includes prestressing tendon elements, and response spectrum analyses were carried out to evaluate seismic forces. Two buildings with flat-shape and L-shape plans were considered, and design forces of shear walls and transfer columns for a system with and without PT tendons were compared. The results showed that, in some cases, excluding PT tendons from the model leads to an unrealistic estimation of the demands for shear walls sit on transfer plate and transfer columns due to excluding the secondary effect of PT tendons. Based on the results, generally, the secondary effect reduces shear force demand and axial-flexural demands of transfer columns but increases the shear force demand of shear walls. The results of this study suggested that, in addition to the effect of PT on the resistance of transfer plate, it is necessary to include PT tendons in the modeling to consider its effect on force demand.

• 한국해양학회지
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• 제30권4호
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• pp.279-287
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• 1995

1992년 5월 21과 22일에 동해 중부해역 3개 정점의 100 m 상부층에서 ²¹⁰Po, ²¹⁰Pb, ²³⁴Th의 농조를 연직적으로 측정하고, 이들 천연방사성핵 종의 분포가 소용돌이의 형성 및 수괴분포에 따라 어떻게 달라지는지를 알아보았다. 그 결과, 소용돌이의 남쪽에 위치한 정점 A1에서는 강한 수온약층이 50~100 m 사이의 층에 존재하고 있고, 속초 연안에 위치한 정점 B10에서는 10~50 m 사이의 층에 존재 하고 있다. 특히, 이 정점의 50~220 m 사이의 층에는 수온이 10.1$\pm$0.5$^{\circ}C$범위인 비교 적 균질한 해수가 존재하고 있으며, 이 수괴는 다른 2개 정점의 동일수심에 비해 수온 이 현저히 높고 영양염류의 농도가 매우 낮다. 이는 영양염류가 고갈된 따뜻한 표층수 가 침강하기 때문일 것이다. ²¹⁰Pb과 ²¹⁰Po의 농도는 3개 정점중 정점 A1 에서 가장 높고, 정점 B1에서 가장 납다. 또한, ²¹⁰Pb과 상반된 분포 양상을 보 인다. 그리고, 소용돌이가 형성되지 않은 2개 정점의 경우 표층 또는 강한 수온약층 상부에서는 어미핵종인 ²¹⁰Pb 보다 ²¹⁰Po 이 부족하지만, 그 하부층에서 는 ²¹⁰Po 의 과잉량을 보인다. 그러나, 소용돌이 중심에 가까운 정점에서는 50 m 하부층에서도 ²¹⁰Po 의 과잉량을 보이지 않고 거의 방사평형된 값이다. ²²⁴Th 의 농도는 정점 A1과 B10의 경우 대체적으로 강한 수온약층 상부층이 그 하부 층보다 낮다.. 그러나, 소용돌이의 중심부에 가까운정점 A1에서는 30 m 상부층의 ²³⁴Th 농도가 그 하부층 보다 오히려 높은데, 이는 입자 물질의 영향 때문인 것 같 다. Box-model 계산 결과, 정점 A1과 정점 B10의 표연혼합층에서 ²¹⁰Po의 체류 시간은 약 1년정도이고, 소용돌이의 중심에 가까운 정점 A1에서는 0.4년이다. 3개 정 점에서 100 m 상부층의 ²³⁴Th 체류 시간은 18~30일 범위이다. 또한, 표면혼합 층으로부터 제거된 ²¹⁰Po 이 수온약층내에서의 재순환율은 정점 A에서 39%이고, 정점 B1에서 92%이다. 이처럼, 정점 B1에서 ²¹⁰Po의 대순환율이 상대적으로 큰 것은 수온약층에서 ²¹⁰Po 의 재순환속도가 느릴 뿐만 아니라 표면혼합층의 두께 가 훨씬 얇기 때문이라고 생각된다.

• 한국축산식품학회:학술대회논문집
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• 한국축산식품학회 2004년도 정기총회 및 제33차 춘계 학술대회
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• pp.89-119
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• 2004

This study was conducted to isolate lactobacilli having probiotic characteristics to be used as health adjuncts with fermented milk products. Acid tolerant strains were selected in Lactobacilli MRS broth adjusted to pH 4.0 from 80 healthy persons (infants, children and adults). And bile tolerant strains were examined in Lactobacilli MRS broth in which 1.0% bile salt was added. By estimation above characteristics, the strains No. 27, which was isolated from adult feces, was selected and identified as Lactobacillus salivarius subsp. salivarius based on carbohydrate fermentation and 16S rDNA sequencing. It was used as a probiotic strain in fermented milk products. The pH of fermented milk decreased from pH 6.7 to 5.0 and titratable acidity increased from 0.3% to 1.0% by L. salivarius subsp. salivarius (isolation strain 20, 35, and 37), when incubated for 36 h at $37^{\circ}C$. The number of viable cell counts of fermented milk was maximized at this incubation condition. The SDS-PAGE evidenced no significant change of casein but distinct changes of whey protein were observed by isolated L. salivarius subsp. salivarius for titratable acidity being incubated by $0.9{\sim}1.0%$ at $37^{\circ}C$. All of the strains produced 83.43 to 131.96 mM of lactic acid and 5.39 to 26.85 mM of isobutyric acid in fermented products. The in vitro culture experiment was performed to evaluate ability to reduce cholesterol levels and antimicrobial activity in the growth medium. The selected L. salivarius subsp. salivarius reduced $23{\sim}38%$ of cholesterol content in lactobacilli MRS broth during bacterial growth for 24 hours at $37^{\circ}C$. All of the isolated L. salivarius subsp. salivarius had an excellent antibacterial activity with $15{\sim}25$ mm of inhibition zone to E. coli KCTC1039, S. enteritidis KCCM3313, S. typhimurium M-15, and S. typhimurium KCCM40253 when its pH had not been adjusted. Also, all of the isolated L. salivarius subsp. salivarius had partial inhibition zone to E. coli KCTC1039, E. coli KCTC0115 and S. enteritidis KCCM3313 when it had been adjusted to pH 5.7. The selected strains were determined to have resistances of twelve antibiotic. Strains 27 and 35 among the L. salivarius subsp. salivarius showed the highest resistance to the antibiotics. Purified ${\alpha}$-galactosidase was obtained by DEAE-Sephadex A-50 ion exchange chromatography, Mono-Q ion exchange chromatography and HPLC column chromatography from L. salivarius subsp. salivarius 27. The specific activity of the purified enzyme was 8,994 units/mg protein, representing an 17.09 folds purification of the original cell crude extract. The molecular weight of enzyme was identified about 53,000 dalton by 12% SDS-PAGE. Optimal temperature and pH for activity of this enzyme were $40^{\circ}C$ and 7.0 respectively. The enzyme was found to be stable between 25 and $50^{\circ}C$. ${\alpha}$-galactosidase activity was lost rapidly below pH 5.0 and above pH 9.0. This enzyme was liberated galactose from melibiose, raffinose, and stachyose, and also the hydrolysis rate of substrate was compound by HPLC. These results indicated that some of the L. salivarius subsp. salivarius (strain 27 and 35) are considered as effective probiotic strains with a potential for industrial applications, but the further study is needed to establish their use as probiotics in vivo.

• 한국동물위생학회지
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• 제25권1호
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• pp.53-73
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• 2002

It has been reported that degranulation of mast cells in rats, rabbits and dog was observed after dosing xylazine hydrochloride(Xh) which has been widely used as sedative, analgesic and muscular relaxant. Therefore, this experiment was conducted to examine the relations between Xh and histamine release and to identify the action of ${\alpha}$-adrenoceptors which exists on the suface of mast cells. 1. The content of histamine within serum was measured with HPLC by performing the O-phthalaldehyde(OPA) fluorescent derivation. The pretreatment method had a little modification from the conventional method. The pretreament was carried out in the following method. 0.2$m\ell$ of serum and 1$m\ell$ of butanol were added to mixed together and then the liquid was centrifugally separated at 4$^{\circ}C$ and 2,000 rpm for 3 minutes. 0.4$m\ell$ of 0.1N HCl and 1.6$m\ell$ of heptane were added to 0.8$m\ell$ of supernatant taken from the liquid, and they were mixed together. This mixture was also centrifugally separated at 4$^{\circ}C$ and 2,000 rpm for 5 minutes. The supernatant was thrown away and the OPA fluorescent derivation was carried out with 0.2$m\ell$ of the lower liquid then, 5 minutes after mixing 400${\mu}\ell$ of 0.1N HCl, 120${\mu}\ell$ of 1N NaOH and 40${\mu}\ell$ of 0.1% OPA in the 0.2$m\ell$ of the lower liquid,120${\mu}\ell$ of 3.57N H$_3$PO$_4$ was added to the mixed liquid, and the liquid, was mixed again and syringe-filtered. Then, the measurement was done with HPLC in the 30 : 70(ν/ν) ratio of 0.004M KH$_2$PO$_4$: CH$_3$CN, flow rate of 1.0$m\ell$/min., and a wavelength of λex= 350nm and λem=444nm at the column temperature of 27$^{\circ}C$, using the fluorescence detector. 2. The content of histamine in each laboratory animal appeared to be higher in such an order as rabbit, rat, guinea pig, dog, Korean indigenous goat, swine, Korean indigenous cattle, Holstein, and mouse, of which the individual mean values${\pm}$standard deviation were 2.0668 ${\pm}$ 0.6049. 0.4999 ${\pm}$ 0.2278, 0.4241 ${\pm}$ 0.1974, 0.1054 ${\pm}$ 0.0556, 0.1028 ${\pm}$ 0.0276, 0.0972 ${\pm}$ 0.0513, 0.0872 ${\pm}$ 0.0373, 0.0717 ${\pm}$ 0.0379, and 0.0706 ${\pm}$ 0.0366, respectively. 3. The content of histamine was measured at the moments of 15-, 30-, 60-, 120-minutes after inoamuscular injection of 20mg/100kg Xh into two to 4 years old Holstein weighing 600∼700kg. The result showed that there was a significant increase at the times of 30- and 90-minutes after injection(p<0.05). 4. Intramuscular injection of 3mg/10kg Xh was given to crossbred pug dogs weighing 2.5∼4.3kg. The content of histamine was measured at the times of 30-, 60-, 90- and 120-minutes after injection. The result revealed that there was a significant increase at the times of 60-and 90-minutes after injection(p<0.05). 5. Intramuscular injection of 10mg/$m\ell$∼25mg/$m\ell$ Xh in concentration of 0.1$m\ell$ was applied to Korean indigenous goat over 5 months old. Then, the content of histamine was measured at the times of 15-, 30-, 60- and 90-minutes after injection. A significant increase was shown at the times of 30- and 60-minutes after injection(p<0.05). 6. The content of histamine was measured at the moments of 30- and 60-minutes after intramuscular injection of 0.1-0.2$m\ell$ Xh (20mg/$m\ell$) into male rabbits weighting 2.5-4kg. A significant increase was found at the moment of 60 minutes after injection(p<0.001). 7. After administering Xh to the mast cell taken from the abdominal cavity of mouse, the content of histamine was measured. The result showed that the higher the concentration, the more significantly the content of histamine was increased(p<0.05). 8. Compound 48/80 was administered in concentration of 5$\mu\textrm{g}$/$m\ell$ and 10$\mu\textrm{g}$/$m\ell$ to the mast cell picked from the abdominal cavity of mouse. The result showed that there was a significant increase in the content of histamine in case of the concentration of 10$\mu\textrm{g}$/$m\ell$(p<0.05). It was found to be about 10,000 to 500,000 times stronger than the Xh. 9. After premedication of 1mg/kg of yohimbine hydrochloride as ${\alpha}$$_2$-adrenergic antagonist to rabbits, the Xh was administered to them. The result was that the value of histamine within serum was decreased significantly(p<0.001). 10. After premeditation of 1mg/kg of prazosin hydrochloride as ${\alpha}$$_1$-adrenergic antagonist to rabbits, the Xh was administered to them. It was found that the value of histamine within serum was decreased significantly(p<0.005). 11, Prazosin hydrochloride and yohimbine hydrochloride as ${\alpha}$$_1$-adrenergic antagonist, respectively, and ${\alpha}$$_2$-adrenergic antagonist were administerd. In this case, the value of histamine within serum was decreased significantly(p<0.0001). As the results, when the Xh is administered to various kinds of animals, the amount of histamine release within serum is increased. In view of the results so far achieved, it is concluded that Xh acted on both a$_1$-adrenoreceptor and ${\alpha}$$_2$-adrenoreceptor induces the degranulation of mast cell.

• 한국식품과학회지
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• 제29권1호
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• pp.1-8
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• 1997

계피나무의 어린가지인 계지의 열수추출물에서 높은 보체계 활성효과(항보체 활성)를 발견하여 대량으로 열수추출한 추출물(CC-O)에 대하여 메탄올 환류, 에탄올 침전, 투석, 동결건조를 실시하여 메탄올과 에탄올에 비가용성인 고분자 획분(CC-1)에서 증가된 활성을 보였다. 60.3%의 당과 32.8%의 단백질로 구성되어 있는 CC-1 획분에서 보체계 활성화 본체를 파악하기 위하여 pronase처리에 의한 단백질 분해 및 periodate를 이용한 다당부위를 선택적으로 산화시킨 후, 각각의 활성을 조사한 결과 pronase 처리한 CC-1에서는 보체계활성 효과를 그대로 유지한 반면, CC-1의 periodate 산화물은 CC-1에 비하여 활성이 50% 이하로 감소한 사실로부터 보체계 활성화 물질이 다당임을 확인하였다. CC-1을 양이온 계면 활성제인 cetavlon으로 처리 후 CC-2, CC-3, CC-4 및 CC-5의 4획분으로 분리하였으며 수율과 활성이 가장 높은 CC-2분획을 음이온 교환 수지인 DEAE-Toyopearl 650C column에 흡착시켜 비흡착획분(CC-2-1)과 7개의 흡착획분$(CC-2-II{\rightarrow}CC-2-VIII)$으로 분획하였다. 이 중 0.2 M NaCl로 용출된 CC-2-III 획분을 Sephadex G-100 및 Sepharose CL-6B 겔여과 크로마토그래피를 행하여 주요 활성다당체인 CC-2-IIIa-3를 최종적으로 정제하였다. HPLC상에서 거의 순수한 단일 peak로 확인된 CC-2-IIIa-3는 41.1%의 산성당을 함유하는 산성다당체로서 분자량은 240,000으로 확인되었다. CC-2-IIIa-3의 항보체 활성$(ITCH_{50})$은 1 ㎎/ml의 농도에서 대조군의 94%를 나타내었으며 구성당 조성은 arabinose, xylose, glucose, galactose, galacturonic acid 및 glucuronic acid가 5.56 : 3.77 : 1.87 : 1.00: 5.12 : 3.13의 비율로 존재하였다.