• Title, Summary, Keyword: natural extracts

Search Result 2,343, Processing Time 0.041 seconds

Antibacterial Characteristics of the Extracts of Yellow Natural Dyes (황색계 천연색소 추출물의 항균 특성)

  • 한신영;최석철
    • Textile Coloration and Finishing
    • /
    • v.12 no.5
    • /
    • pp.315-322
    • /
    • 2000
  • The purpose of this study was to investigate the antibacterial effects of natural colors extracted from yellow natural dyes(Tumeric, Amur Cork Tree and Onion Shell). The water and the methanol extracts of Tumeric and Amur Cork Tree significally decreased the growth of E. coli in vitro and the methanol extract of Tumeric exhibited the strongest inhibitory effect among the samples. Silk and nylon fabrics dyed with water and methanol extracts of the yellow natural dyes showed antimicrobial activities against E. coli and Staph aureus in the Bioassay Test. Nylon fabric dyed with methanol extracts of them showed strong antibacterial effect on E. coli compared with that of water extracts. However, slik fabrics dyed with the extracts could not reduce the growth of E. coli. Silk or nylon fabrics dyed with methanol or water extracts of yellow natural dyes showed antimicrobial activities against Staph aureus. The antimicrobial activity of the fabrics dyed with methanol extracts from Tumeric, Amur Cork Tree and Onion Shell was stronger than that of water extracts, especially, the fabrics dyed with Tumeric extract showed the highest antibacterial property among the dyed fabrics.

  • PDF

Screening for Chemosensitizers from Natural Plant Extracts through the Inhibition Mechanism of P-glycoprotein

  • Ahn, Hee-Jeong;Song, Im-Sook
    • Journal of Pharmaceutical Investigation
    • /
    • v.40 no.5
    • /
    • pp.269-275
    • /
    • 2010
  • P-gp plays a critical role in drug disposition and represents a mechanism for the development of multidrug resistance. Flavonoids, a major class of natural compounds widely present in foods and herbal products, have been shown to inhibit P-gp. Therefore, the aim of this study was to identify new candidate chemosensitizers by screening various plant extracts. The ability of natural plant extracts to inhibit P-gp activity was assessed by measuring cellular accumulation of calcein AM, daunorubicin and vincristine in P-gp overexpressing MDCKII-MDR1 cells. Among more than 800 plant extracts, eight were found to inhibit P-gp activity. Curcuma aromatica extract produced greatest inhibition, followed by Curcuma longa and Dalbergia odorifera extracts. Extracts of Aloe ferox, Curcuma zedoariae rhizome, Zanthoxylum planispinum, and Ageratum conyzoides showed moderate inhibitory effects. Curcumin and quercetin exhibited similar inhibition of P-gpmediated efflux of daunorubicin and vincristine, and flavones had a lesser effect. When chemosensitizing effect was evaluated by measuring daunorubicin sensitivity to MDCKII-MDR1 cells in the presence of natural plant extracts, Curcuma aromatica showed the most potent chemosensitizing effect based on daunorubicin cytotoxicity. In conclusion, natural plant extracts such as Curcuma aromatica can potently inhibit P-gp activity and may have potential as a novel chemosensitizers.

Aldose Reductase Inhibitory Activity of Methanol Extracts from the Korean Plants

  • Jung, Sang-Hoon;Lim, Soon-Sung;Lee, Sang-Hyun;Lee, Yeon-Sil;Shin, Kuk-Hyun;Kim, Yeong-Shik
    • Natural Product Sciences
    • /
    • v.9 no.1
    • /
    • pp.34-37
    • /
    • 2003
  • We examined methanol extracts prepared from the Korean plants for their inhibitory effects on rat lens aldose reductase (RLAR) activity in vitro. Among 41 plant extracts, the extracts of Lagerstroemia indica, Punica granatum, Eurya japonica, Liquidambar styraciflua, and Vitis coignetiae exhibited highest inhibitory potency, even more potent than tetramethylene glutaric acid (TMG), known as one of typical aldose reductase inhibitors $(IC_{50}\;value,\;0.51\;{\mu}g/ml)$. Especially, the extract of Lagerstroemia indica (Lythraceae), exhibited the most inhibitory potency $(IC_{50}\;value,\;0.069\;{\mu}/ml)$ on RLAR.

Antimicrobial Ceramic Hybrid Polyethylene Films with Chamomile Extracts for Feed Packaging

  • Lee, Hye Sun;Chang, Jeong Ho
    • Journal of the Korean Ceramic Society
    • /
    • v.54 no.3
    • /
    • pp.228-234
    • /
    • 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.

Screening of the Antifungal Activity from Natural Products against Candida albicans and Penicillium avellaneum (Candida와 Penicillium 속 진균에 대한 천연물의 항진균 효과 검색)

  • Min, Byeong-Seon;Bang, Gyu-Ho;Lee, Jun-Seong;Bae, Gi-Hwan
    • YAKHAK HOEJI
    • /
    • v.40 no.5
    • /
    • pp.582-590
    • /
    • 1996
  • For the research of antifungal active constituents from natural products, 226 plants were extracted with ether and methanol, separately, and screened antifungal activity against Candida albicans and Penicillium avellaneum cells. The results demonstrated that 30 samlpes showed antifungal activity in ether or methanol extracts and 17 samples in ether extracts and 20 samples in methanol extracts against C. albicans. Against P. avellaneum, 19 samlpes showed antifungal activity in ether or methanol extracts and 17 samples in ether extracts and 11 samples in methanol extracts, respectively. The antifungal activity of natural products against C. albicans were showed more sensitive than P. avellaneum, and the polarity of the solvent was not specific in antifungal activity.

  • PDF

Effect of Natural Extracts on Oral Care Probiotics Weissella cibaria CMU and Periodontal Pathogens

  • Yeu, Ji-Eun;Kim, Hyun-Jin;Kang, Mi-Sun
    • International Journal of Oral Biology
    • /
    • v.43 no.4
    • /
    • pp.193-200
    • /
    • 2018
  • The purpose of this study is to determine if natural extracts could be used as an additive in oral health food made with Weissella cibaria CMU (oraCMU). Natural extracts of green tea, mulberry leaf, licorice, and propolis, which are reported to have antimicrobial activities, were selected and used in this study. The minimum inhibitory concentrations (MIC) of extracts on periodontal pathogens such as Fusobacterium nucleatum and Porphyromonas gingivalis and their synergy effects with oraCMU by the fractional inhibitory concentrations methods were measured. From the results obtained, all the extracts showed no effect on the growth of oraCMU. Green tea extract showed the best antibacterial activity with MIC of 1.8 mg/ml against both F. nucleatum and P. gingivalis. In addition, green tea extract had a synergistic effect with oraCMU against F. nucleatum. Therefore, these results suggested that green tea extract is available as an additive in oral health food made with oraCMU.

Biological evaluation of Korean medicinal plants

  • Woo, Won-Sick;Shin, Kuk-Hyun;Kwon, Young-Myung
    • YAKHAK HOEJI
    • /
    • v.16 no.3
    • /
    • pp.121-128
    • /
    • 1972
  • Alcohol extracts of 70 Korean medicinal plants have been tested for their biological activity. Most of the extracts had slight activity only. Some extracts had more pronounced activity. The results are tabulated.

  • PDF

Natural Scavengers of Reactive Oxygen Species in Rumex crispus as natural colorant

  • Suh, Hwa-Jin;Ahn, In-Yong;Song, Eun-Young;Na, Seon-Young;Park, Jin-Woo;Park, Ji-Ju;Kwon, Oh-Oun
    • Proceedings of the Korean Society of Dyers and Finishers Conference
    • /
    • /
    • pp.41-41
    • /
    • 2011
  • The aims of this study were to examine the efficacy of phytochemicals of Rumex crispus as anti-oxidant and anti-browning agent. The bioactive properties of Rumex crispus as natural colorants were studied by total phenolic contents, DPPH radical scavenging, ABTS radical scavenging,lipid peroxidation, cell viability, singlet oxygen quenching and photoprotection effect. Among all of the results ($IC_{50}$: the concentration of various extracts required to exert 50% reducing effect), the higher activity of the extract was found in the ethyl acetate and butanol extracts. Anti-browning activity was evaluated by monitoring the change $L^*$, $a^*$, $b^*$ values and total color differences(${\Delta}E$). It was found that ethyl acetate and butanol extracts effectively inhibited browning in apple juice at a concentration below 0.3 mg/ml. Rumex crispus extracts used natural colorants could be of good resources as anti-oxidant and anti-browning agents. The results suggest that our study may contribute to the development of natural and functional materials with potential application to reduce oxidative damage.

  • PDF

Investigation of some Natural Product Extracts as Corrosion Inhibitors for Mild Steel in Acid Mediu

  • Subramania, A.;Sathiya Priya, A.R.;Saravanan, S.;Abdul Nasser, A.J.;Vasudevan, T.
    • Corrosion Science and Technology
    • /
    • v.4 no.6
    • /
    • pp.231-235
    • /
    • 2005
  • The inhibitive effect of extracts of tamarind seeds and jackfruit seeds, curry leaves and henna leaves on corrosion of mild steel in 1M HCl solution have been studied by weight loss, potentiodynamic polarization and impedance measurements. Results obtained from the electrochemical techniques were in good agreement with weight loss results. From the weight loss data, the values of surface coverage ($\Theta$) and corrosion rate were calculated. The inhibition efficiency (IE) increased with increasing inhibitor concentration in 1M HCl solution. In all the cases the adsorption of the natural product extracts on the mild steel surface from 1M HCl follows the Langmuir adsorption isotherm relationship. Potentiodynamic polarization studies reveal the fact that all the four natural product extracts act as mixed type inhibitors. The decrease in the inhibition efficiency follows the order: Extracts of jackfruit seed>henna leaves>curry leaves>tamarind seed.

A Study on the Functionality in Natural Colorants

  • Song, Eun-Young;Ahn, In-Yong;Suh, Hwa-Jin;Kim, Mi-Jin;Park, Jin-Woo;Kwon, Oh-Oun
    • Proceedings of the Korean Society of Dyers and Finishers Conference
    • /
    • /
    • pp.122-122
    • /
    • 2012
  • The aims of this study were to examine the efficacy of phytochemical compounds of colorants as anti-oxidant agent. The bioactive properties of natural colorants were studied by total phenolic contents, 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging and anti-bacterial activity in Escherichial coli. The concentration ($IC_{50}$) of various extracts from colorants required to exert 50% reducing effect on DPPH radical were found to be 0.007-4 mg/ml. Especially, the gallnut (Schlectendalia Chinensis) displayed remarkable effect of DPPH as compared to positive control ascorbic acid. The total phenolic contents (TPC) and restraint of E coli. also analyzed. It was found that gallnut extracts effectively inhibited DPPH radical at a concentration below 0.01 mg/ml. Natural colorant extracts could be of good resources as anti-oxidant and anti-bacterial agents. The results suggest that our study may contribute to the development of natural and functional materials with potential application to reduce oxidative damage.

  • PDF