title: Bactericidal properties of the chloroform fraction from rhizomes of Aristolochia paucinervis Pomel.
abstract: The deffated chloroform fraction (APRC) obtained from the rhizomes of Aristolochia paucinervis Pomel (Aristolochiaceae) has a high bacteriostatic activity against bacterial strains like Clostridium perfringens ATCC 13124 and Enterococcus faecalis ATCC 29212. Here, we report the bactericidal activity of APRC against both strains which was evaluated by using time-to kill assays. The results showed that APRC produced an intense time-dependent bactericidal effect against C. perfringens, achieving over a 24 h-period a 5log10-unit decrease in CFU/ml at a concentration > or =1.25 x MIC. In contrast, when tested against E. faecalis, APRC exhibited a concentration-dependent killing activity at concentrations of 1.25 x MIC and 2.5 x MIC, yielding to a decrease of 1.5 and 2.5log10-unit in CFU/ml at 4 h, respectively. However, substantial regrowth of E. faecalis occurred within 24 h. Ultrastructural alterations were observed for both exposed microorganisms by scanning and transmission electron microscopy.
authors: Laboratory of Phytochemistry and Medicinal Plants, Department of Biology, Faculty of Sciences Semlalia, University Cadi Ayyad, 40000, Marrakesh, Morocco. radi.gadhi@iam.net.ma
authors: C A
authors: CA
authors: Gadhi
authors: R
authors: R
authors: Hatier
authors: F
authors: F
authors: Mory
authors: L
authors: L
authors: Marchal
authors: M
authors: M
authors: Weber
authors: A
authors: A
authors: Benharref
authors: M
authors: M
authors: Jana
authors: A
authors: A
authors: Lozniewski
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002725:Chloroform / Q000737:chemistry; D003016:Clostridium perfringens / Q000187:drug effects* / Q000648:ultrastructure; D013293:Enterococcus faecalis / Q000187:drug effects* / Q000648:ultrastructure; D019684:Magnoliopsida / Q000737:chemistry*; D008826:Microbial Sensitivity Tests; D008854:Microscopy, Electron; D010936:Plant Extracts / Q000494:pharmacology*
chemical_list: D000900:Anti-Bacterial Agents; D010936:Plant Extracts; D002725:Chloroform