1.Distribution and antimicrobial resistance profile of Klebsiellapneumoniae
Jingqiu QIN ; Yue QIU ; Shihui GUO ; Meng LI ; Faquan LIN ; Ruirong WAN ; Yan WEN
Chinese Journal of Infection and Chemotherapy 2017;17(3):269-272
Objective To investigate the clinical feature and antibiotic resistance profile of K.pneumoniae isolates from patients for better management of K.pneumoniae infections.Methods Nonduplicate K.pneumoniae strains were collected from January to December in 2015.K.pneumoniae strains were identified by VITEK 2-Compact 60 and tested for antimicrobial susceptibility by KirbyBauer method.Results A total of 753 strains ofK.pneumoniae were included,most (40.9%,308/753) of which were isolated from sputum,followed by urine (18.2%,137/753).Most of the strains were from old patients at least 60 years of age (40.8%,307/753),and primarily from intensive care units (16.7%,126/753) and Department of Respiratory Medicine (13.7%,103/753).Respiratory tract infection was found in 144 patients,of which 71.5% (103/144) were due to K.pneumoniae.More than half of the K.pneumoniae strains were resistant to piperacillin (66.3 %),cefazolin (60.8 %) and cefitroxime (59.4 %).Only a few strain were resistant to imipenem (2.4 %) and meropenem (2.0).ESBLs were produced in 410 (54.4 %) of the 753 strains,and 29 (3.9 %) strains were carbapenem-resistant,492 (65.3 %) strains were resistant to multiple antimicrobial agents.Conclusions Clinical K.pneumoniae isolates are highly resistant to most of the antimicrobial agents tested.The strains were mostly isolated from sputum and urine,and positive for ESBLs.MDR K.pneumoniae sWains are emerging.K.pneumoniae isolates are still very susceptible to carbapenems in vitro.
2.Antimicrobial indole alkaloids from Tabernaemontana corymbosa.
Kun FAN ; Lanchun ZHANG ; Bangyin TAN ; Guy S S NJATENG ; Malong QIN ; Ruirong GUO ; Xiaojuan HUANG ; Cai-Feng DING ; Weimin GAO ; Rongping ZHANG ; Haofei YU
Chinese Journal of Natural Medicines (English Ed.) 2023;21(2):146-153
Four unreported monoterpene indole alkaloids, tabernaecorymines B-E (1-4), together with twenty-one known indole alkaloids (5-25) were obtained from the stem bark of Tabernaemontana corymbosa. Their structures and absolute configurations were elucidated by extensive spectroscopy, quantum chemical calculations, DP4+ probability analyses and Mo2(OAc)4-induced electronic circular dichroism experiment. The antibacterial and antifungal activities of these compounds were evaluated and some of them showed significant activity against Staphylococcus aureus,Bacillus subtilis, Streptococcus dysgalactiae and Candida albicans.
Tabernaemontana
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Anti-Infective Agents
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Antifungal Agents
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Anti-Bacterial Agents
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Indole Alkaloids