• 한국식품저장유통학회지
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• 제24권5호
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• pp.673-679
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• 2017

본 연구에서는 해양미세조류 A. carterae의 기능성 평가를 위해 에탄올 추출을 하였고, 기존의 건강기능성식품인 클로렐라를 에탄올 추출하여 기능성을 비교하였다. 클로렐라 에탄올 추출물(CE)과 A. carterae 에탄올 추출물(AE)의 총페놀성 화합물은 각각 47.39 mg/g과 8.88 mg/g 으로 CE가 5.33배 높았으나, DPPH 라디컬소거능은 22.42%와 20.16%로 비슷한 수준이었다. 반면에 CE와 AE의 ABTS 라디컬 소거능은 각각 28.58%와 17.69%로 CE가 높아 CE의 항산화능은 페놀성 화합물의 효과로 판단된다. AE(10 mg/mL)의 항균활성은 그람음성균 6종과 그람양성균 10종에서 확인하였다. 그리고 CE(10 mg/mL)의 항균활성은 그람음성균 3종과 그람양성균 3종에서 확인되었다. ${\alpha}$-glucosidase의 억제활성은 AE($500{\mu}g/mL$)에서 82.07%이었고, CE는 효소활성을 촉진하는 것으로 나타났다. 암세포 생장억제활성은 $125{\mu}g/mL$ 농도의 AE를 첨가했을 때, HepG2와 HT-29의 생존율이 각각 38%와 11.27%이었다. $31.25-125{\mu}g/mL$의 농도범위에서 CE 첨가가 HepG2와 HT-29의 생장을 촉진하는 것으로 확인되었다. 이와 같은 결과를 종합하면, A. carterae 에탄올 추출물은 페놀성 화합물 이외의 항산화 물질을 보유하고, 항균활성, 항당뇨효과와 암세포 억제활성이 우수한 기능성 물질을 함유하고 있는 것으로 판단되어 기능성 소재로써의 활용가치가 높을 것으로 판단된다.

• 한국콘텐츠학회논문지
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• 제19권1호
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• pp.242-255
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• 2019

이 연구는 34종의 천연 식물 추출물을 이용하여 치주염 원인균 Actinobacillus actinomycetemcomitans와 Prevotella intermedia에 대한 항균효과를 조사하였다. 이에 본 연구는 치주염 원인균에 대한 천연 식물 추출물의 항균효과를 연구하고자 유기용매 추출물을 이용하여 생육저지활성을 측정하고, 시료 추출물의 최소생육저해농도(Minimum Inhibition Concentration, MIC)를 측정한다. 1차적으로 34종의 각 천연 식물 추출물을 에탄올로 추출하여 디스크 확산법(disk diffusion method)을 이용하여 각 추출물의 생육저지환(clear zone, mm)의 크기를 측정한 결과 나복자, 목통, 백작약, 사간, 선복화, 어성초, 연교, 진교, 천련자, 황금, (천)황련, 황백, 해동피 등 13종에서 천연 식물 추출물이 치주염의 원인균인 A. actinomycetemcomitans에 대해서 생육저지 활성을 나타내었다. P. intermedia의 경우, 나복자, (일)당귀, 목통, 사간, 선복화, 어성초, 육계, 자완, 천련자, 황금, (천)황련, 황백, 해동피 등 13종에서 생육저지 활성을 나타내었다. A. actinomycetemcomitans에 대해서는 사간, 육계, 해동피, 황백, (천)황련에서 항균효과가 나타났다. (천)황련은 A. actinomycetemcomitans의 모든 유기용매 분획에서 가장 우수한 생육저지 활성을 나타내었다. P. intermedia는 사간, 육계, 천련자, 황백, 황련에서 생육저지 활성이 나타났다.

• Restorative Dentistry and Endodontics
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• 제25권4호
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• pp.561-574
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• 2000

Poly-P has been used to prevent decomposition of foods and has been shown to have inhibitory effect on the growth of gram positive bacteria. The purpose of this study was to evaluate the effect of poly-P on the growth of Porphyromonas endodontalis, a gram negative obligate anaerobic rod, endodontopathic bacterium. P. endodontalis ATCC 35406 was in BHI broth containing hemin and vitamin K with or without poly-P. Inhibitory effect of each poly-P which was added at the beginning(lag phase) or during(exponential phase) the culture, MIC(minimum inhibitory concentration) was determined by measuring the optical density of the bacterial cell at 540nm. Viable cell counts were measured to determined whether poly-P has a bactericidal effect. Leakage of intracellular nucleotides from P. endodontalis was determined at 260nm and morphological change of P. endodontalis was observed under the TEM(transmission electron microscope). Binding of 32P-labeled poly-P to P. endodontalis was examined. SDS-polyacrylamide gel electrophoresis and zymography were performed to observe the changes in protein and enzyme profiles of P. endodontalis, respectively. The results from this study were as follows : 1. The minimal inhibitory concentration(MIC) of poly-P to P. endodontalis appeared to be 0.04~0.05%. 2. Poly-P added to the P. endodontalis culture during the exponential phase of P. endodontalis was as much effective as poly-P added at the begining of the culture, suggesting that the antibacterial effect of poly-P is not much dependent on the initial inoculum size of P. endodontalis. 3. Poly-P are bactericidal to P. endodontalis, demonstrating the decrease of the viable cell counts. 4. Intracellular nucleotide release from the P. endodontalis, was not increased in the presence of poly-P and was not reversed by the addition of divalent cations like $Ca^{2+}$ and $Mg^{2-}$. 5. Under the TEM, it was observed that fine electro-dense materials were prominent in the poly-P grown P. endodontalis, appearing locally in the cell, and the materials were more abundant and more dispersed in the cell as the incubation time with poly-P increased. In addition, highly electron dense granules accumulated in many poly-P grown cells, most of which were atypical in their shape. 6. Binding of 32P-labeled poly-P to P. endodontalis appeared to be 32.8 and 45.5 and 53.4% at 30 minutes, 1 hours and 2 hours, respectively. 7. In the presence of poly-P. the synthesis of proteins with apparent molecular masses of 25, 27, 35, 45 was lost or drastically decreased whereas expression of a protein with an apparent molecular mass of 75 was elevated. 8. Proteolytic activity of P. endodontalis was decreased by poly-P. The overall results suggest that use of poly-P may affect the growth of P. endodontalis, and the anti-bacterial activity of poly-P seems largely bactericidal. Changes in shape, protein expression, and proteolytic activity of P. endodontalis by poly-P may be directly and indirectly attributed to the antibacterial effect of poly-P. Further studies will be needed to confirm the effect of poly-P.

• 한국의류산업학회지
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• 제10권4호
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• pp.552-559
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• 2008

Recent days, various inner wears, sheets and interior goods are manufactured using materials dyed with loess emphasizing its improved blood circulation, metabolism, anti-bacterial, deodorizing properties, and far-infrared ray emissions. The purpose of this study is to investigate the effect of chitosan treatment on the dyeing of cotton fabric using loess as colorants. Particle size of loess, the morphology and dyeability(K/S) of chitosan crosslinked cotton fabrics, and washing durability of loess dyed cotton fabric were investigated. In this study, cotton fabrics were treated with a crosslinking agent, epichlorohydrin, in the presence of chitosan to improve the dyeing properties of cotton fabrics with natural dye by the chemical linking of chitosan to the cellulose structure. This process was applied by means of the conventional mercerizing process. The results obtained were as follows; Mean average diameter of loess was $1.13{\mu}m$. According to various conditions, the optimum dyeing conditions for cotton fabrics pretreated by 1% chitosan treatment was where 10%(owb) of loess was applied at $90^{\circ}C$ for 120minutes, while for cotton fabrics without chitosan treatment was where 15%(owb) of loess was applied at $90^{\circ}C$ for 150minutes. Overall, K/S value of loess dyed cotton fabric pretreated with 1% chitosan was higher than that of cotton fabrics without chitosan treatment. The Color fastness, washing fastness and light fastness of loess were excellent as 4-5grade.

• Biomolecules & Therapeutics
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• 제4권1호
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• pp.103-109
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• 1996

To investigate the effect of the third intracellular loop (i3 loop) peptide of human $\beta$$_2$-adrenergic receptor on receptor agonist binding, we expressed third intracellular loop region of human $\beta$$_2$-adrenergic receptor as glutathione S-transferase fusion protein in E. coli. DNA fragment of the receptor gene which encodes amino acid 221-274 of human $\beta$$_2$-adrenergic receptor was amplified by polymerase chain reaction and subcloned into the bacterial fusion protein expression vector pGEX-CS and expressed as a form of glutathione-S-transferase (GST) fusion protein in E. coli DH5$\alpha$. The receptor fusion protein was identified by SDS-PAGE and Western blot using monoclonal anti-GST antibody. The fusion protein expressed in this study was purified to an apparent homogeneity by glutathione Sepharose CL-4B affinity chromatography. The purified i3 loop fusion proteins at a concentration of 10 $\mu\textrm{g}$/ι caused right shift of the isoproterenol competition curve of [$^3$H]Dihydroalprenolol binding to hamster lung $\beta$$_2$-adrenergic receptor indicating lowered affinity of isoproterenol to $\beta$$_2$-adrenergic receptor possibly due to the uncoupling of receptor and G protein in the presence of the fusion protein. The uncoupling of receptor and G protein suggests that i3 loop region plays a critical role on $\beta$$_2$-adrenergic receptor G protein coupling.

• BMB Reports
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• 제35권3호
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• pp.291-296
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• 2002

Thanatin, a 21-residue peptide, is an inducible insect peptide with a broad range of activity against bacteria and fungi. It has a C-terminal disulfide loop, like the frog skin secretion antimicrobial peptides of the brevinin family. In this study, we tried to find the effect of a number of amino acids between the disulfide bond. Thanatin showed stronger antibacterial activity to Gram negative bacteria than other mutants, except Th1; whereas, the mutant peptides with deletion had higher activity to Gram positive bacteria than thanatin. An increase in the number of amino acid(s) using the alanine residue decreased the antibacterial activity in all of the bacteria. Th1 with deletion of threonine at position 15 ($Thr^{15}$) showed similar antibacterial activity against Gram-negative bacteria, but had higher activity against the Gram positive bacteria. In order to study the structure-function relationship, we measured liposome disruption by the peptides and CD spectra of the peptides. Th1 also showed the highest liposome leaking activity and α-helical propensity in the sodium dodecyl sulfate solution, compared with other peptides. Liposome disruption activity was closely correlated with the anti-Gram positive bacterial activity. All of the peptides showed no hemolytic activity. Th1 was considered to be useful as an antimicrobial peptide with broad spectrum without toxicity.

• 생명과학회지
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• 제15권2호
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• pp.279-286
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• 2005

손바닥선인장 추출물은 한의학에서 항염증 작용, 화상, 부종, 소화 불량 등 몇 가지의 생리학적 기능이 확인되었다. 본 연구에서는 손바닥선인장 줄기를 메탄올을 이용하여 추출한 후 그 추출물을 이용하여 항균활성을 확인한 결과 병원균 등 일반 세균에서 항균활성을 확인하였다. 특히, 약제내성균 및 혐기성 균인 여드름 원인균 뿐만 아니라 효모, 곰팡이 등 진균류에서도 항균활성을 나타내어 넓은 항균 스펙트럼을 가지고 있음을 확인할 수 있었다. 또한 열 처리, 저장온도 및 저장기간이 항균활성에 영향을 미치지 않았으므로 온도 및 기간에 안정함을 확인할 수 있었고, 식품 보존제로서의 가능성 확인 시험에서도 기존의 식품 보존제보다 안전성이 있는 항균활성 물질로 평가되었다.

• 한국응용약물학회:학술대회논문집
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• 한국응용약물학회 1998년도 Proceedings of UNESCO-internetwork Cooperative Regional Seminar and Workshop on Bioassay Guided Isolation of Bioactive Substances from Natural Products and Microbial Products
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• pp.198-198
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• 1998

Muc1 mucin is found in a variety of epithelial tissue and is overexpressed in several epithelial cancer. Recently it is alsol reported that primary Hamster tracheal surface epithelial(HTSE) cells express Muc1 protein and cDNA encoding HTSE muc1 protein has been cloned. Although numerous monoclonal antibodies (mAbs) to human muncins, particularly Muc1 have been produced, no such antibodies to murine Muc1 have been described. We now describe monoclonal antibody, called mAb M1CT, produced to C-terminal region of HTSE Muc1 protein by immunising mice with a glutathion-s-transferase linked fusion protein. In this study, using this antibody(mAb M1CT) we investigated the effect of RA on the expression of Muc1 in HTSE cells. Retinoic acid(RA) plays an essential role in maintaining normal differentiation of tracheal epithelial cells. With RA-deficiency tracheocytes undergo squamous metaplasia, an abnormal differentiation that can be reversed by RA. We had primary culture of HTSE cells under different concentrations of RA. Culture was maintained until the direction of differentiation was determined. Then Western blot analysis with mAb M1CT was performed with the cell lysates from the culture. The expression of Muc1 protein was decreased in dose-dependent manner as the concentration of retinoic acid was decreased. Our result indicates that the expression of Muc1 protein is coordinately regulated with airway mucous cell differentiation by RA pathway. And the antibody, mAb M1CT, produced in this study should provide useful tool to study the expression of Muc1 mucin in differentiation process or disease.

• 대한영양사협회학술지
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• 제24권4호
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• pp.330-343
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• 2018

Recently, there has been a growing demand for natural preservatives because of increased consumer interest in health. In this study, we produced Lactobacillus rhamnosus cell-free supernatant (LCFS) and evaluated and compared its antimicrobial activity with existing natural preservatives against pathogenic microorganisms and in chicken breast meat contaminated with Escherichia coli and Staphylococcus aureus. Lactobacillus rhamnosus cell-free supernatant possessed 30 units of lysozyme activity and contained 18,835 mg/L of lactic acid, 2,051 mg/L of citric acid and 5,060 mg/L of acetic acid. Additionally, LCFS inhibited the growth of fourteen pathogenic bacteria, S. aureus, Bacillus cereus, Listeria monocytogenes, Vibrio parahaemolyticus, Listeria innocua, S. epidermidis, L. ivanovii, E. coli, Pseudomonas aeruginosa, Shigella sonnei, Shi. flexneri, Proteus vulgaris, Pseudomonas fluorescens, and Klebsiella pneumoniae. The antibacterial activity of LCFS was stronger than that of egg white lysozyme (EWL), Durafresh (DF) and grapefruit seed extract (GSE). Additionally, LCFS maintained its antimicrobial activity after heat treatment at $50^{\circ}C{\sim}95^{\circ}C$ and at pH values of 3~9. Moreover, LCFS inhibited the growth of E. coli and S. aureus in chicken breast meat. In conclusion, it is expected that LCFS, which contains both lysozyme and three organic acids, will be useful as a good natural preservative in the food industry.

• 한방비만학회지
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• 제13권1호
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• pp.17-23
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• 2013

Objectives: This study was performed to evaluate the effects of fermented Samjung-hwan (SJH) extracts on weight, serum lipids and blood glucose. Methods: SJH was fermented using three different probiotic bacterial strains (Lactobacillus plantarum [LP], Leuconostoc mesenteroides [LM], Bifidobacterium longum [BL]) separately. Thirty-six rats were divided into normal, control (high fat diet), SJH-UF (high fat diet+unfermented SJH 200 mg/kg), SJH-LP (high fat diet+LP fermented SJH 200 mg/kg), SJH-LM (high fat diet+LM fermented SJH 200 mg/kg) and SJH-BL (high fat diet+BL fermented SJH 200 mg/kg). For 8 weeks later, we examined body weight, total cholesterol, high-density lipoprotein (HDL)-cholesterol and blood glucose. Results: The control group showed significantly increased weight gain compared with normal group and SJH-LP and BL groups had less weight gain than control group, significantly. In the lipid serum tests, control group showed significantly increased total cholesterol levels compared with normal group and only SJH-LP represented decreased total cholesterol levels compared with control group. However there was no significant change in the HDL-cholesteol levels. In the blood glucose tests, that of control group significantly incereased more than that of normal group, SJH-BL showed significantly decreased blood glucose levels compared with control group. Conclusions: SJH-LP, SJH-BL showed weight control effect, SJH-LP decreased TC and SJH-BL reduced blood glucose.