| 1 | Antioxidant,antimicrobial,and α-glucosidase inhibitory activities of saponin extracts from walnut(Juglans regia L.) leaves显示文摘Objective:To investigate the relationship between triterpenoid saponin content and antioxidant,antimicrobial,and α-glucosidase inhibitory activities of 70%ethanolic,butanolic,aqueous,supernate and precipitate extracts of Juglans regia leaves.Methods:Triterpenoid saponins of different Juglans regia leaf extracts were measured by the vanillin method.Antioxidant activity was evaluated against DPPH and ABTS free radicals.We also assessed α-glucosidase inhibitory and antimicrobial activities of the leaf extracts.Pearson’s correlation coefficient was evaluated to determine the correlation between the saponin content and biological activities.Results:The butanolic extract was most effective against DPPH with an IC50of 6.63μg/mL,while the aqueous extract showed the highest scavenging activity against ABTS free radical with an IC50of 42.27μg/mL.Pearson’s correlation analysis indicated a strong negative correlation (r=-0.956) between DPPH radical scavenging activity (IC50) and the saponin content in the samples examined.In addition,the aqueous extract showed the best α-glucosidase inhibitory activity compared with other extracts.All the extracts had fair antibacterial activity against Bacillus subtilis,Escherichia coli,and Klebsiella pneumoniae except for the aqueous extract.Conclusions:Juglans regia extracts show potent antioxidant,antimicrobial,and α-glucosidase inhibitory activities.There is a correlation between saponin levels in Juglans regia leaf extracts and the studied activities.However,additional research is required to establish these relationships by identifying the specific saponin molecules responsible for these activities and elucidating their mechanisms of action. | Youssef Elouafy Adil El Yadini Salma Mortada Mohamed Hnini Hicham Harhar Asaad Khalid Ashraf NAbdalla Abdelhakim Bouyahya Khang Wen Goh Long Chiau Ming My El Abbes Faouzi Mohamed Tabyaoui | 2023 | Asian Pacific Journal of Tropical Biomedicine2023，13，2： | 1 |
| 3 | Clustering of halophytic species from Cyprus based on ionic contents显示文摘This paper presents the work conducted on the chemical constituents of some common and widely distributed halophyte taxa from Cyprus with the aim that these studies will help in the evaluation of halophytes for different economical purposes.The plant species of Crithmum maritimum L.,Limbarda crithmoides(L.)Dumort,Atriplex portulacoides L.,Salsola kali L.,Atriplex halimus L.,Limonium oleifolium Mill.,L.meyeri(Boiss.)Kuntze;and Tetraena alba(L.f.)Beier&Thulin were collected in the middle of July.The shoot tissue and leaf samples were collected from the natural habitats and left for drying under air circulation followed by placing them in oven at 60°C for 96 hours.The material was crushed using mortar and pestle and subjected to an analysis of macro-and micro-nutrients and biochemical compounds.K+/Na+in the leaf tissues of the dicot species showed relatively high values depicting their behavior as Na+includes but very low Cl-levels were recorded.Out of the species investigated here in 4 TFAA content was rather high.Values ranging from 0.5%to 1%dry weight were exhibited in one species.However,only 3 species showed very low TFAA values.Later may be due to low nitrogen availability in their environment.The phenetic analyses of eight halophyte species performed on the data matrix using Ntsys-pc program version 2.1 revealed that,cluster analysis of the overall results obtained here leads to 2 clusters.This discrimination appears to be as a result of their different abilities to accumulate either proline or glycine betaine. | Ozturk M S Gucel V Altay MSA Ahmad MY Ashraf M Ashraf | 2019 | Phyton-International Journal of Experimental Botany2019，88，1： | 0 |
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