scholarly journals Chemical constituents and antimicrobial activity of Lisotrigona cacciae propolis collected in Hoa Binh province

2021 ◽  
Vol 63 (2) ◽  
pp. 70-73
Author(s):  
Le Nguyen Thanh ◽  
◽  
Nguyen Phuong Thao ◽  
Nguyen Tu Minh ◽  
Trinh Khanh Huyen ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Chemical Constituents ◽  
Mangifera Indica ◽  
Chemical Study ◽  
Stingless Bee ◽  
Strong Activity ◽  
Etoh Extract ◽  
Mic Value ◽  
Hoa Binh

A chemical study on the propolis of the stingless bee Lisotrigona cacciae collected from Hoa Binh province led to the isolation of four compounds including cycloartenol (1), cochinchinone A (2), α-mangostin (3), and isomangiferolic acid (4). Mangifera indica (Xoài) and Cratoxylum cochinchinense (Thành Ngạnh Nam) were suggested to be the resin sources of the propolis. The propolis EtOH extract showed good antimicrobial activity against the Gram (+) strains B. cereus with an MIC value of 8 μg/ml. Among the isolated compounds, α-mangostin (3) was the most active and displayed strong activity against the five strains B. cereus, E. feacalis, S. aureus, P. aeruginosa, and the fungus C. albicans with MIC values of 1-2 μg/ml.

Antimicrobial Activity of the Seed Kernel and Leaf Extracts of Mangifera indica L. (Fam. Anacardiaceae) Against Escherichia coli

Planta Medica ◽  
2013 ◽  
Vol 79 (05) ◽  
Author(s):  
ADC Abergas ◽  
MCQ Aleria ◽  
ZJS Alimagno ◽  
KNC Batac ◽  
AFM De Lara ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Antimicrobial Activity ◽  
Mangifera Indica ◽  
Seed Kernel ◽  
Leaf Extracts

scholarly journals Comparison of a Short Linear Antimicrobial Peptide with Its Disulfide-Cyclized and Cyclotide-Grafted Variants against Clinically Relevant Pathogens

2021 ◽  
Vol 9 (6) ◽  
pp. 1249
Author(s):  
Johannes Koehbach ◽  
Jurnorain Gani ◽  
Kai Hilpert ◽  
David J Craik
Keyword(s):  
Antimicrobial Activity ◽  
Antimicrobial Peptide ◽  
Human Serum ◽  
World Health ◽  
Resistant Bacteria ◽  
Moderate Activity ◽  
Antimicrobial Compounds ◽  
Strong Activity ◽  
Linear Peptide ◽  
Linear Version

According to the World Health Organization (WHO) the development of resistance against antibiotics by microbes is one of the most pressing health concerns. The situation will intensify since only a few pharmacological companies are currently developing novel antimicrobial compounds. Discovery and development of novel antimicrobial compounds with new modes of action are urgently needed. Antimicrobial peptides (AMPs) are known to be able to kill multidrug-resistant bacteria and, therefore, of interest to be developed into antimicrobial drugs. Proteolytic stability and toxicities of these peptides are challenges to overcome, and one strategy frequently used to address stability is cyclization. Here we introduced a disulfide-bond to cyclize a potent and nontoxic 9mer peptide and, in addition, as a proof-of-concept study, grafted this peptide into loop 6 of the cyclotide MCoTI-II. This is the first time an antimicrobial peptide has been successfully grafted onto the cyclotide scaffold. The disulfide-cyclized and grafted cyclotide showed moderate activity in broth and strong activity in 1/5 broth against clinically relevant resistant pathogens. The linear peptide showed superior activity in both conditions. The half-life time in 100% human serum was determined, for the linear peptide, to be 13 min, for the simple disulfide-cyclized peptide, 9 min, and, for the grafted cyclotide 7 h 15 min. The addition of 10% human serum led to a loss of antimicrobial activity for the different organisms, ranging from 1 to >8-fold for the cyclotide. For the disulfide-cyclized version and the linear version, activity also dropped to different degrees, 2 to 18-fold, and 1 to 30-fold respectively. Despite the massive difference in stability, the linear peptide still showed superior antimicrobial activity. The cyclotide and the disulfide-cyclized version demonstrated a slower bactericidal effect than the linear version. All three peptides were stable at high and low pH, and had very low hemolytic and cytotoxic activity.

scholarly journals Antifungal Activity of Chemical Constituents from Piper pesaresanum C. DC. and Derivatives against Phytopathogen Fungi of Cocoa

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3256
Author(s):  
Luis C. Chitiva-Chitiva ◽  
Cristóbal Ladino-Vargas ◽  
Luis E. Cuca-Suárez ◽  
Juliet A. Prieto-Rodríguez ◽  
Oscar J. Patiño-Ladino
Keyword(s):  
Antifungal Activity ◽  
Benzoic Acid ◽  
Chemical Constituents ◽  
Chemical Study ◽  
Positive Control ◽  
Positive Influence ◽  
Phytopathogenic Fungi ◽  
Phytochemical Study ◽  
Benzoic Acid Derivatives ◽  
First Time

In this study, the antifungal potential of chemical constituents from Piper pesaresanum and some synthesized derivatives was determined against three phytopathogenic fungi associated with the cocoa crop. The methodology included the phytochemical study on the aerial part of P. pesaresanum, the synthesis of some derivatives and the evaluation of the antifungal activity against the fungi Moniliophthora roreri, Fusarium solani and Phytophthora sp. The chemical study allowed the isolation of three benzoic acid derivatives (1–3), one dihydrochalcone (4) and a mixture of sterols (5–7). Seven derivatives (8–14) were synthesized from the main constituents, of which compounds 9, 10, 12 and 14 are reported for the first time. Benzoic acid derivatives showed strong antifungal activity against M. roreri, of which 11 (3.0 ± 0.8 µM) was the most active compound with an IC50 lower compared with positive control Mancozeb® (4.9 ± 0.4 µM). Dihydrochalcones and acid derivatives were active against F. solani and Phytophthora sp., of which 3 (32.5 ± 3.3 µM) and 4 (26.7 ± 5.3 µM) were the most active compounds, respectively. The preliminary structure–activity relationship allowed us to establish that prenylated chains and the carboxyl group are important in the antifungal activity of benzoic acid derivatives. Likewise, a positive influence of the carbonyl group on the antifungal activity for dihydrochalcones was deduced.

Stingless Bee Honeys from Costa Rica Exhibit Antimicrobial Activity Against Antibiotic-resistant Clinical Isolates

2015 ◽  
Vol 5 (2) ◽  
pp. 144-149
Author(s):  
Zamora Gabriel ◽  
Beukelman Kees ◽  
van den Berg Bert ◽  
Arias María Laura ◽  
Umaña Eduardo ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Costa Rica ◽  
Stingless Bee ◽  
Clinical Isolates ◽  
Antibiotic Resistant

scholarly journals Antioxidant and antimicrobial activity of stingless bee bread and propolis extracts

2017 ◽  
Author(s):  
Rabieatul Adawieah Md Akhir ◽  
Mohd Fadzelly Abu Bakar ◽  
Shuaibu Babaji Sanusi
Keyword(s):  
Antimicrobial Activity ◽  
Stingless Bee ◽  
Bee Bread ◽  
Antioxidant And Antimicrobial Activity

Chemical Constituents and Antimicrobial Activity of the Leaf and Rhizome Oils of Alpinia pahangensisRidl., an Endemic Wild Ginger from Peninsular Malaysia

2011 ◽  
Vol 8 (4) ◽  
pp. 668-673 ◽  
Author(s):  
Khalijah Awang ◽  
Halijah Ibrahim ◽  
Devi Rosmy Syamsir ◽  
Mastura Mohtar ◽  
Rasadah Mat Ali ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Chemical Constituents ◽  
Peninsular Malaysia

TOPICAL GEL OF EXTRACT OF MANGIFERA INDICA L. SEED KERNELS; AN INDIGENOUS PLANT WASTE FOR POTENTIAL ANTI-ACNE ACTIVITY

INDIAN DRUGS ◽  
2021 ◽  
Vol 58 (05) ◽  
pp. 73-76
Author(s):  
Leena Varhadi ◽  
◽  
Shweta Kitture ◽  
Namita Desai ◽  
Aparna Palshetkar
Keyword(s):  
Antimicrobial Activity ◽  
Mangifera Indica ◽  
Waste Product ◽  
Ethanolic Extract ◽  
Seed Kernel ◽  
In Vitro Antimicrobial Activity ◽  
Topical Gel ◽  
Plant Waste ◽  
Indigenous Plant

The present study was aimed at the development of topical gel of extract of Mangifera indica L. seed kernel and evaluation of its in vitro antibacterial activity. Various extracts using different solvents were prepared and evaluated for in vitro activity against Propionibacterium acnes. Ethanolic extract of M. indica L. seed kernel exhibited the highest in vitro antimicrobial activity and was considered further. Topical gels of this ethanolic extract were prepared using different polymers such as Carbopol 974P, Xanatural 180 and Methocel K15M in varying concentrations. The topical gel of 10 % w/w ethanolic extract of M. indica L. seed kernel with 2% w/w Carbopol 974P was uniform and yellowish transparent with satisfactory spreadability. The developed gel showed greater in vitro antimicrobial activity as compared to marketed herbal cream. These results indicate the potential of topical gel of ethanolic extract M. indica L. seed kernel as anti-acne formulation developed from plant waste product.

scholarly journals Seasonal effects and antifungal activity from bark chemical constituents of Sterculia apetala (Malvaceae) at Pantanal of Miranda, Mato Grosso do Sul, Brazil

2015 ◽  
Vol 45 (3) ◽  
pp. 283-292 ◽  
Author(s):  
Fernanda Mussi FONTOURA ◽  
Rosemary MATIAS ◽  
Juliane LUDWIG ◽  
Ademir Kleber Morbeck de OLIVEIRA ◽  
José Antonio Maior BONO ◽  
...  
Keyword(s):  
Antifungal Activity ◽  
Chemical Constituents ◽  
Chemical Study ◽  
Stem Bark ◽  
Seasonal Effects ◽  
Chemical Components ◽  
Phytochemical Analysis ◽  
Wet Season ◽  
Mycelium Growth ◽  
Mato Grosso

In the Southern Pantanal, the hyacinth macaw (Anodorhynchus hyacinthinus), an endangered species, often chooses the manduvi tree (Sterculia apetala) as a nesting site, because of its physical properties. In addition, the chemical composition of the wood may also contribute to a nesting selection by the hyacinth macaws. The objective of this study was to determine the main chemical components of S. apetala bark for two seasons, and evaluate its fungicidal potential. Bark samples from S. apetala trees with and without nests of A. hyacinthinus were collected in January (wet season) and August (dry season) of 2012. The inhibition of mycelium growth (MGI) from tree samples with and without nests were assessed using a phytochemical analysis to evaluate their antifungal activity against Trichoderma sp. Phytochemical analysis confirmed the presence of phenolic compounds and flavonoids. In both seasons, samples obtained from nested trees had higher content of total phenols than those collected from non-nested trees. The average content of total flavonoids was higher in January for samples with nest and in August for samples without nest. All selected samples showed antifungal activity, and those with nest collected in August (peak of hyacinth macaw breeding) resulted in an MGI of 51.3%. Therefore, this percentage, related to the content of flavonoids and the presence of coumarins, may influence the reproductive success of hyacinth macaws and other species of birds, in this region. This is the first chemical study report with the stem bark of S. apetala.

scholarly journals Chemical Constituents and Antimicrobial Activity of Essential Oils of (Annonaceae) from Sarawak

2013 ◽  
Vol 4 (1) ◽  
pp. 48-48
Author(s):  
Fasihuddin B. Ahmad ◽  
Zaini B Assim ◽  
Ismail B. Jusoh ◽  
Hamzah Mohd. Salleh ◽  
Laily B. Din
Keyword(s):  
Antimicrobial Activity ◽  
Essential Oils ◽  
Chemical Constituents

scholarly journals Study on antibacterial activity of Calotropis procera

2014 ◽  
Author(s):  
Muhammad Muzammal
Keyword(s):  
Antimicrobial Activity ◽  
Antibacterial Activity ◽  
Methanolic Extract ◽  
Ethanolic Extract ◽  
Salmonella Typhi ◽  
Calotropis Procera ◽  
Phytochemical Analysis ◽  
Zone Of Inhibition ◽  
Crude Extracts ◽  
Mic Value

Comparative study of plant extracts crude and aqueous, methanolic and ethanolic with antibiotics, provide evidence that calotropis procera extracts has the similar antibacterial activity as these antibiotics against test pathogens i.e. Salmonella typhi and E.coli. The analysis of antimicrobial activity of aqueous, methanolic and ethanolic extract of leaves and flower of Calotropis procera was carried out in disc method and also determined MIC value at 600nm through optical density using spectrophotometer. The zone of inhibition produced by extracts was examined and compares it with zone produced by antibiotics. The effect exhibited by ethanolic extract of leaves and flower was significantly greater than the aqueous and methanolic extract of leaves and flower. Crude extracts i.e. latex, leaves, fruit and flower crude extracts. Among them, flower crude extracts shows similar zone of inhibition to test anitibiotics.while in MIC value, we made different concentration of extracts and antibiotics.i.e for crude we made 25%, 50%.75% and 100% concentration of crude juice and for the aqueous, methanolic and ethanolic we made 0.5mg/mL,1mg/mL,2mg/mL,3mg/mL,4mg/mL, 5mg/mL and 6mg/mL in Dimethyl salfoxide, and same antibiotics concentration. Aqueous leaves extracts show MIC at 0.5mg/ml against E.coli while against Salmonella it shows MIC at 1mg/ml... We also determine phytochemical analysis for presences of different compounds in crude extracts. The obtained results provide a support for the use of Calotropis procera, in traditional medicine and suggest its further advance investigation.

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