• 제목, 요약, 키워드: natural antimicrobial

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은나노 입자의 항균작용과 작용기작 (Antimicrobial Effects and Mechanism(s) of Silver Nanoparticle)

  • 황인석;조재용;황지홍;황보미;최혜민;이준영;이동건
    • 한국미생물·생명공학회지
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    • v.39 no.1
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    • pp.1-8
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    • 2011
  • The antimicrobial effects of silver (Ag) ion or salts are well known. Recently, silver nanoparticle is attracting an interest in a wide variety of fields since it has been known to be safe and effective as an antimicrobial agent against a broad spectrum of microorganisms. Although silver nanoparticle has been applied to various kinds of products owing to its potent antimicrobial activity, the effects of silver nanoparticle on microorganisms and antimicrobial mechanism have not been revealed clearly. In this paper, we summarized the characteristics, antimicrobial activities and mechanisms, cytotoxicity and applicability of silver nanoparticle.

Pharmacology of Iridoid: Antimicrobial Activities of Aucubin

  • Lee, Eun-Sook;Ahn, Jung-Wook;Mar, Woong-Chon;Chang, Il-Moo
    • 생약학회지
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    • v.17 no.2
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    • pp.129-133
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    • 1986
  • Antimicrobial activities of aucubin, an iridoid glycoside, were investigated. Gram-positive bacterium, S. aureus appeared to be more sensitive to aucubin's aglucone, aucubigenin than Gram-negative, E. coli did. Antimicrobial activities produced by aucubigenin may result in part from the inhibition of RNA and protein biosyntheses in bacterial cells. The conversion of aucubin iridoid glycoside into aucubigenin, an aglucone, appears to be a prerequisite step to exhibit the antimicrobial activities.

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Antimicrobial Ceramic Hybrid Polyethylene Films with Chamomile Extracts for Feed Packaging

  • Lee, Hye Sun;Chang, Jeong Ho
    • 한국세라믹학회지
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    • v.54 no.3
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    • pp.228-234
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    • 2017
  • This work was achieved on the preparation of antimicrobial ceramic hybrid polyethylene films with natural chamomile extracts. The antimicrobial activity and various physicochemical properties of the prepared films were evaluated. Various natural products demonstrated antimicrobial activity. Among them, chamomile extracts showed strong activity and no cytotoxicity rather than that of the natural extracts. Porous ceramic materials were synthesized and demonstrated loading and controlled release of natural antimicrobial extracts. Furthermore, chamomile loaded ceramic hybrid films showed antimicrobial activity that was maintained for over 15 days.

생식기의 Candida albicans, Neisseria gonorrhoeae 및 Lactobacillus acidofillus에 대한 천연물질과 Polyphenol의 효과 (Effects of Natural Substances and Polyphenols on Candida albicans, Neisseria gonorrhoeae and L. acidofillus in the Reproductive Organ)

  • 한상진
    • 생약학회지
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    • v.42 no.4
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    • pp.329-335
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    • 2011
  • Antimicrobial studies on reproductive organs have been scarcely reported. Candida albicans and Neisseria gonorrhoea test to find out the natural substances of various concentrations in the antimicrobial experiments have been made. Antimicrobial effect of biopole as the natural compound biosynthesis matter that contain anti-inflammatory material, catechin polyphenols and lactic acid as a single natural substance on C. albicans were of great significance. Also the results of antimicrobial effects of biopole, catechin and lactic acid as a single natural substance on N. gonorrhoea, respectively, showed lower concentration than those of the antimicrobial effects on C. albicans. Through the survival of Lactobacillus acidofillus that acts for the protection of the genital tissue the importance of lactic acid was confirmed. Lactobacillus acidofillus protection and C. albicans firmly into disinfected to low concentrations of the natural mixture from biopole and catechin with lactic acid were found and the antimicrobial effects of this natural mixture on N. gonorrhoea were perfect. C. albicans and N. gonorrhoea to disinfect the optimal natural mixture from 2% concentration biopole, 0.2% concentration of catechin and 2% lactic acid were obtained. Through the survival of Lactobacillus acidofillus in the reproductive organs protectable effects were acquired to prevent the infections of reproductive tissue and the recurrence.

Status, Antimicrobial Mechanism, and Regulation of Natural Preservatives in Livestock Food Systems

  • Lee, Na-Kyoung;Paik, Hyun-Dong
    • 한국축산식품학회지
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    • v.36 no.4
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    • pp.547-557
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    • 2016
  • This review discusses the status, antimicrobial mechanisms, application, and regulation of natural preservatives in livestock food systems. Conventional preservatives are synthetic chemical substances including nitrates/nitrites, sulfites, sodium benzoate, propyl gallate, and potassium sorbate. The use of artificial preservatives is being reconsidered because of concerns relating to headache, allergies, and cancer. As the demand for biopreservation in food systems has increased, new natural antimicrobial compounds of various origins are being developed, including plant-derived products (polyphenolics, essential oils, plant antimicrobial peptides (pAMPs)), animal-derived products (lysozymes, lactoperoxidase, lactoferrin, ovotransferrin, antimicrobial peptide (AMP), chitosan and others), and microbial metabolites (nisin, natamycin, pullulan, ε-polylysine, organic acid, and others). These natural preservatives act by inhibiting microbial cell walls/membranes, DNA/RNA replication and transcription, protein synthesis, and metabolism. Natural preservatives have been recognized for their safety; however, these substances can influence color, smell, and toxicity in large amounts while being effective as a food preservative. Therefore, to evaluate the safety and toxicity of natural preservatives, various trials including combinations of other substances or different food preservation systems, and capsulation have been performed. Natamycin and nisin are currently the only natural preservatives being regulated, and other natural preservatives will have to be legally regulated before their widespread use.

내츄럴 이미지의 패션소재기획을 위한 건강소재 - Japan bamboo leaves 추출물 염색소재의 발색성과 항균성 - (Healthy Fabrics for Natural-imageable Fashion Fabric Planning - Dyeability and antimicrobial activity of dyeable materials from Japan bamboo leaves extract -)

  • 박영미;구강;김삼수
    • 한국염색가공학회지
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    • v.21 no.6
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    • pp.29-38
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    • 2009
  • Natural dyes seem to be more profitable on human and environment, and recently they could be considered as a better alternative to synthesized dyes. The aim of the current work was to investigate the dyeing property and antimicrobial activity of commercial cotton fabrics dyed with kumazasa (usually called in japan) which is known as conventional japan bamboo leaves. Actually, the dyeability and antimicrobial property of dyed fabric with natural mordant/dyeing was compared with synthetic mordant/dye process. The results of this study obtained are as follows. The apparently colour of kumazasa leaves extract dyed fabrics showed with light green or slightly yellow-green. In colorfastness to washing, ${\Delta}E$ and K/S values of dyed fabrics with natural chitosan as mordant used was shown to be more excellent results, than was synthetic mordant used. However, the decrease rate was recorded nearly 50% when washing repeated 20 cycles. In result of antimicrobial effect for bacteria, the dyed fabrics didn't show the significant antimicrobial activity to the both dyed with and without mordant. Results of this investigation considered that low-cost, natural, bio-mordant are relatively effective in natural coloration.

Antimicrobial Activities of Volatile Essential Oils from Korean Aromatic Plants

  • Shin, Kuk-Hyun;Chi, Hyung-Joon;Lim, Soon-Sung;Cho, Seon-Haeng;Moon, Hyung-In;Yu, Jae-Hyeun
    • Natural Product Sciences
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    • v.3 no.2
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    • pp.141-147
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    • 1997
  • Volatile essential oils obtained by steam distillation from 55 plant parts of 42 species of representative aromatic plants newly collected in Korean peninsula have been evaluated for antimicrobial activity against 5 microorganisms. The essential oils derived from 15 plant parts and 9 plant parts were found to exhibit very strong antimicrobial activities by more than 95% inhibition at 100 ${\mu}g/ml$ against Staphylococcus aureus and Pseudomonas aeruginosa, respectively. Essential oil components such as l-limonene, ${\beta}-myrcene$, linalool, ${\gamma}-terpinene$, ${\alpha},{\beta}-phellandrene$, 1,8-cineole, l-borneol and bornylacetate, as a whole, have primarily contributed to the manifestation of the antimicrobial activity.

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환경친화적 바이오폴리머인 세균 섬유소의 항균활성과 염색성 (Antimicrobial Activity and Coloration of Environment-Friendly Biopolymer, Bacterial Cellulose)

  • 이나리;정진하;박성보;정성윤;황대연;김홍성;손홍주
    • Journal of Environmental Science International
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    • v.20 no.7
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    • pp.899-905
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    • 2011
  • In order to develop bacterial cellulose (BC) with antimicrobial activity against pathogenic microorganisms, silver and chitosan were incorporated into BC, respectively. Experiment results showed that antimicrobial activity against pathogenic microorganisms was improved with increasing silver concentration. Chitosan also showed a direct proportion between its concentration and antimicrobial activity. These results suggest that antimicrobial effects of BC using silver and chitosan are well proven to be effective. We also tested the stainability of BC with natural colorant for the application of food industry. Stainability of BC was enhanced with increasing natural colorant concentration. Decolorization of BC stained was observed by dipping it into distilled water with one hour-intervals. As a result, there was no significant difference. Combination of natural colorant-stainability and antibiosis of BC is expected to be useful in making colored antibiotic BC in various industrial application areas, considering its antimicrobial activity, high stainability and low decolorization tendency.

A Pre-treatment Process for Natural Dyeing of Wool to Impar t Durable Antimicrobial Efficacy

  • Raja, A.S.M.;Thilagavathi, G.
    • 한국염색가공학회지
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    • v.23 no.2
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    • pp.69-75
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    • 2011
  • A pre-treatment process has been developed for natural dyeing of wool by which the dyed materials have been imparted antimicrobial efficacy against both gram-positive and gram-negative bacteria durable up to 20 washes. In this process, wool fabrics were treated with citric acid under oxidizing condition prior to dyeing. The treated fabrics were then dyed with four different types of natural dye powders obtained from leaves of silver oak, wattle, tanner's senna and flame of forest. All the natural dyes produced yellowish brown colour on wool fabrics. The washing and light fastness properties of the fabrics subjected to pre-treatment were one grade higher compared to those of the dyed fabrics without pre-treatment. The pre-treated wool fabrics showed antimicrobial efficacy against both gram-positive bacteria (Staphylococcus aureus) and gram-negative bacteria (Escherichia coli). The fabrics dyed without pre-treatment showed antimicrobial efficacy against gram-positive bacteria (Staphylococcus aureus) only. The durability of antimicrobial efficacy was higher in pre-treated and dyed wool fabrics compared to the dyed fabrics without pre-treatment.

천혜의 항생제: 항균펩티드 (Natural Antibiotics: Antimicrobial Peptides)

  • 김연숙;김정재;최영님
    • 대한치과의사협회지
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    • v.41 no.2
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    • pp.116-123
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    • 2003
  • Antimicrobial Peptides are natural antibiotics evolved by many plants, invertebrate, and vertebrate to defend against the microbial infection. Antimicrobial peptides show a broad-spectrum antimicrobial activity with little opportunity for the development of resistance since they target microbial membranes that distinguish microbes from enkaryotic cells. The oral cavity is constantly exposed to microbial challenges and antimicrobial peptides play an important role in managing the oral health. With the increase of resistant micro-organisms to conventional antibiotics, antimicrobial peptides are attracting interests as novel antibiotics. In this review, the characteristics of antimicrobial of antimicrobial peptides including the classification, mechanism of action, resistance, and expression in the oral cavity have been discussed in the prospects of application to oral disease.

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