• 한국수산과학회지
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• 제57권2호
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• pp.129-136
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• 2024

Lactic acid bacteria (LAB) growth in processed meat products produces slime. In this study, 10 different biofilm-forming LAB, including Leuconostoc mesenteroides, Lacticaseibacillus paracasei, Levilactobacillus brevis, Lactiplantibacillus plantarum, Leuconostoc citreum, Weissella viridescens, and Latilactobacillus sakei, were isolated from various meat products and identified based on 16S rRNA gene analysis. To inhibit biofilm formation by LABs, Eisenia bicycles methanolic extract (EB) and ethyl acetate soluble fraction (EA) were used as antibacterial and antibiofilm agents, respectively. Furthermore, EA and EB were employed to synthesize gold nanoparticles (AuNPs) such as EB-AuNPs and EA-AuNPs, which could serve as antibiofilm agents against the isolated LAB. These findings demonstrate that EA, EB-AuNPs, and EA-AuNPs exhibit significant antibacterial activity against the isolated LAB. Furthermore, EB-AuNPs reduced L. citreum biofilm production, whereas EA-AuNPs inhibited L. mesenteroides and L. brevis biofilm formation. The current results suggest that EB-AuNPs and EA-AuNPs can be used as nanomaterials to inhibit LAB that form biofilms on meat products.

• 한국해양바이오학회지
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• 제12권1호
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• pp.1-10
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• 2020

Asthma is a complex inflammatory disease of the lung characterized by variable airflow obstruction, airway hyperresponsiveness, airway inflammation, and reduction of respiratory function. Its prevalence and incidence are increasing because of the effect of various environmental and lifestyle risk factors. Steroid inhalation, long-acting agonists, and other synthetic drugs are used for the treatment of this disease. However, they have some side effects and show unsatisfied result and response after treatment. Therefore, many researchers have focused on the development of natural product-related treatment for asthma to suppress the side effects and unsatisfied results. Seaweeds contain various bioactive compounds with anti-inflammatory, antibacterial, and anti-oxidant activities. Thus, we investigated the asthma treatment-related literature using marine algae via the Google scholar search engine. Consequently, the literature is rarely investigated, but is increasing steadily. The literature was performed as a comparison study with an ovalbumin-induced group or drug-treated group, and investigated the antiasthma activity of algae ethanol extract. Although many researchers have studied marine algae-derived therapeutic agents for asthma, the amount of literature is rare compared with those of herbal medicine-derived therapeutic agents. Conclusively, we suggest that many researchers should investigate and develop algae-derived therapeutic agents for asthma treatment.

• 한국콘텐츠학회논문지
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• 제20권6호
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• pp.425-432
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• 2020

본 연구는 상업용 Ortho MTA에 생체활성 유리 나노입자(bioactive glass nano particles)에 구리(Cu) 0.5, 1.0, 2.0, 4.0 wt%를 첨가하여 새로운 Cu-BGn MTA를 조성하고 세균부착실험을 통한 항균효과와 물성을 평가하였다. 경화시간과 압축강도는 ISO 6876(2012) 규격에 맞추어 직경 4 mm, 두께 6 mm 시편을 제작하여 산출하였으며, 항균효과는 S. mutans, E. faecalis 2개의 균주를 이용하여 평가하였다. 실험 결과 경화시간과 압축강도는 Cu-BGn 첨가와는 통계적으로 유의한 차이를 보이지 않았다(p>0.05). 항균실험 결과 대조군 Ortho MTA와 비교하여 Cu-BGn을 4.0 wt% 첨가한 S. mutans 실험군에서 낮은 부착 양상을 보였으며 통계적으로 유의한 차이가 나타났다(p<0.05). E. faecalis 실험군에서도 4.0 wt% 첨가한 군에서 통계적으로 유의한 차이를 보였다(p<0.05). 이는 Cu-BGn의 세균부착 억제 효과가 있음을 입증한 것이라 사료된다. 향후 구강환경을 재현시킬 수 있는 다양한 환경에서의 심도 있는 연구가 필요할 것으로 생각된다.

• 한국해양바이오학회지
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• 제11권2호
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• pp.42-51
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• 2019

We compared the antibacterial activities of spermidine and astaxanthin against two gram-positive bacteria such as Streptococcus parauberis and S. iniae to find new antibacterial candidates. We also evaluated the preventive effects of spermidine against oxidative stress-induced cytotoxicity in C2C12 myoblasts. Our results indicated that spermidine has more significant antibacterial activities than astaxanthin against both two fish pathogenic bacteria as well as gram-negative bacteria Escherichia coli used as a control group. Minimum inhibitory concentration and minimum bactericidal concentration of spermidine were 0.25 mM and 1 mM against S. parauberis, 1 mM and 3 mM against S. iniae, and 0.5 mM and 1.5 mM against E. coli, respectively. In addition, the postantibiotic effect lasted from 7 h, 5 h and 6 h for S. parauberis, S. iniae and E. coli, respectively. The results also showed that the decreased C2C12 cell viability by H₂O₂ could be attributed to the induction of DNA damage and apoptosis accompanied by the increased production of reactive oxygen species, which was remarkably protected by spermidine. Additionally, the antioxidant effect of spermidine was associated with the activation of Nrf2 signaling pathway. According to the data, spermidine may be a potential lead compound which can be further optimized to discover novel antibacterial and antioxidant agents.

• 한방재활의학과학회지
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• 제25권2호
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• pp.1-13
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• 2015

Objectives Methicillin-Resistant Staphylococcus aureus (MRSA) is a human pathogen and a major cause of hospital-acquired infections. New antibacterial agents that have not been compromised by bacterial resistance are needed to treat MRSA-related infections. In this study, we investigated the antimicrobial activity ofethanol extract of Haedokgeumhwa-san (HGH) which prescription is composed of korean medicine against MRSA. Methods The antibacterial activity of HGH extract was evaluated against MRSA strains by using the Disc diffusion method, broth microdilution method (minimal inhibitory concentration; MIC), checkerboard dilution test, and time-kill test; its mechanism of action was investigated by bacteriolysis, detergent or ATPase inhibitors. The checkerboard dilution test was used to examined synergistic effect of ampicillin, oxacillin, ciprofloxacin, vancomycin, gentamicin and norfloxacin in combination with HGH ethanol extract. A time-kill assay was performed a survival curve which was obtained by plotting viable colony counts depending on time on bacterial growth. Results The minimum inhibitory concentration (MIC) of ethanol extract (HGH) ranged from 1,000 to $2,000{\mu}g/mL$ against all the tested bacterial strains, respectively. We are able to confirm that HGH extract has potentially strong antibacterial activity. In the checkerboard dilution test, fractional inhibitory concentration index of HGH in combination with antibiotics indicated synergy or partial synergism against S. aureus. A time-kill study showed that the growth of the tested bacteria was considerably inhibited after 8 hr of treatment with the combination of HGH with selected antibiotics. For measurement of cell membrane permeability, HGH $250{\sim}1,000{\mu}g/mL$ along with concentration of Triton X-100 (TX) and Tris-(hydroxymethyl) aminomethane (Tris) were used. In the other hand, N,N-dicyclohexylcarbodimide (DCCD) and Sodium azide ($NaN_3$) was used as an inhibitor of ATPase. TX, Tris, DCCD and $NaN_3$ cooperation against S. aureus showed synergistic action. Accordingly, antimicrobial activity of HGH was affected by cell membrane and inhibitor of ATPase. Conclusions These results suggest that Haedokgeumhwa-san extract has antibacterial activity, and that HGH extract offers a potential as a natural antibiotic against MRSA.

• 미생물학회지
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• 제54권2호
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• pp.113-125
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• 2018

본 연구에서는 히스타민을 생성하는 유산균과 이에 항균 활성을 나타내는 프로바이오틱 유산균을 혼합 접종하여 제조한 렌넷 커드 내 항균물질과 히스타민 생산에 영향을 미치는 인자를 조사하였다. 프로바이오틱 유산균인 Lactobacillus plantarum FIL20과 Lactobacillus sakei PIL52는 히스타민 생성균인 Lactobacillus brevis LAS129, Enterococcus faecium SBP12 및 Enterococcus faecalis SBP58에 대해 강력한 항균 물질을 생산하였고, 프로바이오틱균이 생산한 유산과 박테리오신의 항균 활성은 농도의존적이었다. 렌넷 커드 제조를 위해 접종한 프로바이오틱 유산균의 균수가 많을수록 항균 물질 생성량이 증가되어 히스타민 생성균에 대한 항균 활성도 높아졌다. 프로바이오틱 유산균과 히스타민 생성균은 NaCl 10% 첨가에 의해 증식이 억제됨으로써 렌넷 커드 내에 항균 물질과 히스타민의 함량은 대조구보다 유의하게 낮았다(P < 0.05). 한편, 프로바이오틱 유산균과 히스타민 생성균을 혼합하여 제조한 렌넷 커드를 $25^{\circ}C$에서 5일간 저장 했을 때 히스타민의 함량은 유의하게 증가되지 않았으나, $20^{\circ}C$에서 20일간 저장한 경우에는 프로바이오틱 유산균이 생산한 항균 물질의 활성이 감소됨에 따라 렌넷 커드 내에 히스타민의 함량이 유의하게 증가되었다(P < 0.05).

• 한국식품영양과학회지
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• 제39권10호
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• pp.1411-1417
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• 2010

총 폴리페놀 함량은 로즈마리에서 가장 높은 폴리페놀 함량을 보였고, 구절초, 라벤더, 레몬그라스도 $72{\sim}80\;{\mu}g$/mg의 비교적 높은 폴리페놀 함량을 보였다. 반면 카렌듈라와 목향은 다른 허브류보다 20~40% 정도의 낮은 폴리페놀의 함량을 보였다. 그리고 총 플라보노이드 함량에서는 레몬그라스, 로즈마리, 구절초, 카렌듈라, 라벤더, 목향 순으로 높은 함량을 나타냈다. 로즈마리, 라벤더, 구절초, 레몬그라스는 최고농도에서 90% 이상의 높은 DPPH 소거능이 있었고, $IC_{50}$값은 로즈마리 $6.23{\pm}0.58\;{\mu}g/mL$, 라벤더 $18.29{\pm}0.68\;{\mu}g/mL$, 구절초 $20.33{\pm}1.04\;{\mu}g/mL$, 레몬그라스 $22.38{\pm}0.77\;{\mu}g/mL$, 카렌듈라 $60.03{\pm}4.01\;{\mu}g/mL$, 목향 $65.64{\pm}2.64\;{\mu}g/mL$이었다. 이들 허브 추출물들의 항균 활성을 살펴보면, S. aureus 균주는 최고농도 100 mg/mL에서 구절초 14.5 mm, 로즈마리 15 mm로 가장 뛰어난 항균활성을 나타내었고, E. coli O157:H7 균주는 최고농도 100 mg/mL에서 구절초 16 mm, 로즈마리 17 mm로 우수한 항균효과를 나타냈다. 따라서 허브류 중에서 로즈마리 추출물이 가장 높은 총 폴리페놀의 함량을 보였고, 총 플라보노이드의 함량은 레몬그라스에서 가장 높았다. 또한 S. aureus와 E. coli O157:H7 2종류의 균에 대한 항균 효과는 로즈마리와 구절초에서 가장 뛰어난 효과를 확인하였다.

• 공업화학
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• 제34권2호
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• pp.192-198
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• 2023

본 연구에서는 마이크로웨이브를 이용하여 추출한 측백나무 잎의 성분을 분석하고 세포독성, 항균 및 항바이러스 활성을 평가하였다. 마이크로웨이브 추출법에 따른 주요 성분은 catechin, leucopelargonidin, arecatannin, quinolone 및 kaempferol 유도체 등으로 나타나 플라보노이드와 탄닌 계열 물질을 함유하고 있는 것을 확인하였다. 인간 상피세포 (HaCaT)를 대상으로 한 세포독성 평가에서는 0.11 mg/mL 농도에서 독성이 나타나지 않음을 보였다. 항균 성능은 외용 소독제(의약외품) 효력평가법 가이드라인에 따라 측정하였으며 1.11 mg/mL 농도에서는 그람 음성균인 대장균에 대해 항균 효과가 낮은 반면, 그람 양성균인 황색포도상구균에 대해서는 99.9%의 항균 효율을 나타내었다. 또한, 추출물의 농도를 높이고 균과의 접촉 시간을 증가시킬 경우 대장균에 대해서도 99.9%의 항균 효율을 나타낼 수 있음을 보였다. 항균 활성 외에도 바이러스에 대한 살균제의 활성을 측정하는 표준(ASTM E1052-20)에 따라 평가 결과 인플루엔자 A (H1N1)와 SARS-CoV-2에 대해 99.99% 이상의 항바이러스 활성을 가지고 있음을 확인하였다. 이 결과들은 측백나무 추출물이 항바이러스 소독제나 표면 코팅제, 개인 보호용구 및 방역용 섬유 소재로서 응용될 수 있음을 시사한다.

• Archives of Pharmacal Research
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• 제25권6호
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• pp.807-816
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• 2002

Dihydrofolate reductases (DHFR) of human, Candida albicans and E. coli were docked with their original ligands of X-ray crystal complex using QXP (Quick eXPlore), a docking program. Conditions to reproduce the crystal structures within the root mean square deviation (rmsd) of 2.00 $\AA$ were established. Applying these conditions, binding modes and species-specificities of a novel antibacterial compound, $N^4-(2-acetoxyethoxymethyl)-2-acetylpyridine$ thiosemicarbazone (MTSC), were studied. As the results, the docking program reproduced the crystal structures with average rmsd of six ligands as 0.91 $\AA$ ranging from 0.49 to 1.45 $\AA$. The interactions including the numbers of hydrogen bonds and hydrophobic interactions were the same as the crystal structures and superposition of the crystal and docked structures almost coincided with each other. For AATSC, the results demonstrated that it could bind to either the substrate or coenzyme sites of DHFR in all three species with different degrees of affinity. It confirms the experimentally determined kinetic behavior of uncompetitive inhibition against either the inhibitor or the coenzyme. The docked MTSC overlapped well with the original ligands and major interactions were consistent with the ones in the crystal complexes. The information generated from this work should be useful for future development of antibacterial and antifungal agents.

• The Journal of Advanced Prosthodontics
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• 제9권3호
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• pp.217-223
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• 2017

PURPOSE. This study investigated the effects of silver nanoparticle (SN) loading into hydraulic calcium silicate-based Portland cement on its mechanical, antibacterial behavior and biocompatibility as a novel dental bone substitute. MATERIALS AND METHODS. Chemically reduced colloidal SN were combined with Portland cement (PC) by the concentrations of 0 (control), 1.0, 3.0, and 5.0 wt%. The physico-mechanical properties of silver-Portland cement nanocomposites (SPNC) were investigated through X-ray diffraction (XRD), setting time, compressive strength, solubility, and silver ion elution. Antimicrobial properties of SPNC were tested by agar diffusion against Streptococcus mutans and Streptococcus sobrinus. Cytotoxic evaluation for human gingival fibroblast (HGF) was performed by MTS assay. RESULTS. XRD certified that SN was successfully impregnated in PC. SPNC at above 3.0 wt% significantly reduced both initial and final setting times compared to control PC. No statistical differences of the compressive strength values were detected after SN loadings, and solubility rates of SPNC were below 3.0%, which are acceptable by ADA guidelines. Ag ion elutions from SPNC were confirmed with dose-dependence on the concentrations of SN added. SPNC of 5.0 wt% inhibited the growth of Streptococci, whereas no antimicrobial activity was shown in control PC. SPNC revealed no cytotoxic effects to HGF following ISO 10993 (cell viability > 70%). CONCLUSION. Addition of SN promoted the antibacterial activity and favored the bio-mechanical properties of PC; thus, SPNC could be a candidate for the futuristic dental biomaterial. For clinical warrant, further studies including the inhibitory mechanism, in vivo and long-term researches are still required.