Objective:To assess the antibacterial activity of eight Iranian plant extracts against Staphylococcus aureus(S.aureus) strains which were isolated from infected patients.Methods: The studied strains were isolated from...Objective:To assess the antibacterial activity of eight Iranian plant extracts against Staphylococcus aureus(S.aureus) strains which were isolated from infected patients.Methods: The studied strains were isolated from urine,stool,blood and wound of infected patients and identified by biochemical tests.In further,the antibacterial activity of 8 ethanolic local plant extracts including Querqus brantii(Q.brantii),Ziziphus spina-christi(Z.spina-christi),Peganum harmala(P.harmala),Oliveira decumbens(O.decumbens),Galium tricornutum(G.tricornutum), Vitex pseudo negundo(Vi.pseudo negundo),Salvia officinalis(S.officinalis),Vaccaria pyramidata (V.pyramidata) were then evaluated using agar disc diffusion method.Results:A total of 9 isolates were isolated and identified as S.aureus.Antibacterial profile of the strains showed that the strains were resistant to methicillin and cefixime.The highest antibacterial activity against the studied strains were belong to Q.brantii,P.harmala,Z.spina-christi and O.decumbens vent extracts with 11-40 mm,15-28 mm,8-26 mm and 10-20 mm of diameters,respectively. Intermediate antibacterial activity was exhibited by G.tricornutum and Vi.pseudo negundo against some of the studied strains with 7-20 mm and 7-13 mm of diameters,respectively. Noteworthy,out of 9 studied strains;6 and 2 of them were resistant to the G.tricornutum and Vi. pseudo negundo extracts,respectively.The S.officinalis and Va.pyramidata,however,showed no antibacterial activity against the studied strains.Conclusions:The Q.brantii,P.harmala,Z. spina-christi and O.decumbens extracts were shown to possess strong antibacterial activity against methicillin and cefixime resistant S.aureus strains and can be considered as the promising natural antibiotics for treating the studied strains.展开更多
Herein,conductivity measurements have been carried out to explore the interaction between cetyltrimethylammonium bromide(CTAB,a cationic surfactant) and antibiotic drug(cefixime trihydrate(CMT)) in water and also in o...Herein,conductivity measurements have been carried out to explore the interaction between cetyltrimethylammonium bromide(CTAB,a cationic surfactant) and antibiotic drug(cefixime trihydrate(CMT)) in water and also in occurrence of inorganic salts(NaCl,Na2 SO4 and Na3 PO4) over the temperature range of 303.15-323.15 K with an interval of 5 K.In all cases,two critical micelle concentrations(c^*) were achieved for the CMT-surfactant system.Addition of CMT drug to CTAB solution decreases the values of c^* which indicates the interaction between CMT and CTAB.Both values of c^* for CMT-CTAB mixture in the presence of salts are lower in magnitude compared to the aqueous medium which indicates that micellization of the CMT-CTAB mixed system is favorable in salt solution.The values of △Gm^0 were obtained to be negative indicating the spontaneity of the micellization process and the extent of spontaneity further increases by means of rising temperature.The obtained outcomes from the ΔHm^0 and ΔSm^0 values disclose that the interactions between CMT and CTAB are mostly electrostatic along with hydrophobic in nature.The thermodynamic parameters of transfer and enthalpy-entropy compensation phenomenon were also determined and discussed in detail.展开更多
Cefixime, a third-generation semi-synthetic cephalosporin antibiotic was used as a copper corrosion inhibitor in 1M HNO<sub>3</sub> solution. The study was conducted through the weight loss technique at 29...Cefixime, a third-generation semi-synthetic cephalosporin antibiotic was used as a copper corrosion inhibitor in 1M HNO<sub>3</sub> solution. The study was conducted through the weight loss technique at 298 - 318 K and theoretical studies based on quantum chemistry. The studied drug inhibited the corrosion of copper in 1M HNO<sub>3</sub> over the cefixime concentration range (0.02 - 2 mM). The inhibition efficiency increased with an increase in the inhibitor concentration to reach 91.07% at 2 mM, but decreased with an increase in temperature. The thermodynamic functions related to the adsorption of cefixime on the copper surface and that of the metal dissolution were computed and analyzed. The results point out spontaneous adsorption, mainly through a physisorption mechanism following Langmuir adsorption isotherm model and an endothermic dissolution process. Quantum chemical calculations were also performed at B3LYP level with 6-31G (d, p) basis set and lead to molecular descriptors such as E<sub>HOMO</sub> (energy of the highest occupied molecular orbital), E<sub>LUMO</sub> (energy of the lowest unoccupied molecular orbital), Δ<i>E</i> (energy gap) and <i>μ<span style="white-space:normal;"></span></i> (dipole moment). The global reactivity descriptors such as <span style="white-space:normal;"><i></i></span><i>χ<span style="white-space:normal;"></span></i> (electronegativity), <span style="white-space:normal;"><i></i></span><i>χ<span style="white-space:normal;"></span></i> (global hardness), <span style="white-space:normal;"><i></i></span><i>S<span style="white-space:normal;"></span></i> (global softness), and <span style="white-space:normal;"><i></i></span><i>ω<span style="white-space:normal;"></span></i> (electrophilicity index) were derived using Koopman’s theorem and analyzed. The local reactivity parameters, including Fukui functions and dual descriptors were determined and discussed. Experimental and theoretical results were found to be in good agreement.展开更多
Objective:To investigate the effects of cefixime on the systemic inflammatory stress response and intestinal mucosal barrier injury in children with infective enteritis.Methods:A total of 80 children with infective en...Objective:To investigate the effects of cefixime on the systemic inflammatory stress response and intestinal mucosal barrier injury in children with infective enteritis.Methods:A total of 80 children with infective enteritis who were treated in the hospital between March 2016 and August 2017 were divided into group A (n=40) and group B (n=40) according to the random number table method. Group A received cefaclor anti-infective therapy, group B received cefixime therapy, and both therapies lasted for 1 week. The differences in serum levels of inflammatory mediators, oxidative stress indexes and intestinal mucosal injury markers were compared between the two groups before and after treatment.Results: Before treatment, the differences in serum levels of inflammatory mediators, oxidative stress indexes and intestinal mucosal injury markers were not statistically significant. After 1 week of treatment, serum inflammatory mediators IL-8 and TNF-α levels of group B were lower than those of group A whereas IL-10 level was higher than that of group A;serum oxidative stress indexes ROS and MDA levels were lower than those of group A whereas GSH-Px and CAT levels were higher than those of group A;serum intestinal mucosal injury markers DAO, D-Lactate, FABP and GST levels were lower than those of group A.Conclusion: Cefixime anti-infective therapy can effectively inhibit the inflammatory stress response and reduce the intestinal mucosal barrier injury in children with infective enteritis.展开更多
A 61-year-old male was admitted to our hospital due to right lower abdominal pain and watery diarrhea for 3 d.Beginning 3 wk before he arrived in our hospital,he took 3 rd-generation cephalosporin(cefixime) for 2 wk d...A 61-year-old male was admitted to our hospital due to right lower abdominal pain and watery diarrhea for 3 d.Beginning 3 wk before he arrived in our hospital,he took 3 rd-generation cephalosporin(cefixime) for 2 wk due to chronic left ear otitis media.Colonoscopic examination revealed yellowish patches of ulcerations and swelling covered with thick serosanguineous exudate in the cecum and ascending colon.After 7 d of oral metronidazole treatment,his symptoms completely disappeared.We report a case of localized pseudomembranous colitis in the cecum and ascending colon mimicking acute appendicitis associated with cefixime.展开更多
文摘Objective:To assess the antibacterial activity of eight Iranian plant extracts against Staphylococcus aureus(S.aureus) strains which were isolated from infected patients.Methods: The studied strains were isolated from urine,stool,blood and wound of infected patients and identified by biochemical tests.In further,the antibacterial activity of 8 ethanolic local plant extracts including Querqus brantii(Q.brantii),Ziziphus spina-christi(Z.spina-christi),Peganum harmala(P.harmala),Oliveira decumbens(O.decumbens),Galium tricornutum(G.tricornutum), Vitex pseudo negundo(Vi.pseudo negundo),Salvia officinalis(S.officinalis),Vaccaria pyramidata (V.pyramidata) were then evaluated using agar disc diffusion method.Results:A total of 9 isolates were isolated and identified as S.aureus.Antibacterial profile of the strains showed that the strains were resistant to methicillin and cefixime.The highest antibacterial activity against the studied strains were belong to Q.brantii,P.harmala,Z.spina-christi and O.decumbens vent extracts with 11-40 mm,15-28 mm,8-26 mm and 10-20 mm of diameters,respectively. Intermediate antibacterial activity was exhibited by G.tricornutum and Vi.pseudo negundo against some of the studied strains with 7-20 mm and 7-13 mm of diameters,respectively. Noteworthy,out of 9 studied strains;6 and 2 of them were resistant to the G.tricornutum and Vi. pseudo negundo extracts,respectively.The S.officinalis and Va.pyramidata,however,showed no antibacterial activity against the studied strains.Conclusions:The Q.brantii,P.harmala,Z. spina-christi and O.decumbens extracts were shown to possess strong antibacterial activity against methicillin and cefixime resistant S.aureus strains and can be considered as the promising natural antibiotics for treating the studied strains.
基金Jahangirnagar University, Savar, Dhaka, Bangladesh for providing financial support to carry out the research work
文摘Herein,conductivity measurements have been carried out to explore the interaction between cetyltrimethylammonium bromide(CTAB,a cationic surfactant) and antibiotic drug(cefixime trihydrate(CMT)) in water and also in occurrence of inorganic salts(NaCl,Na2 SO4 and Na3 PO4) over the temperature range of 303.15-323.15 K with an interval of 5 K.In all cases,two critical micelle concentrations(c^*) were achieved for the CMT-surfactant system.Addition of CMT drug to CTAB solution decreases the values of c^* which indicates the interaction between CMT and CTAB.Both values of c^* for CMT-CTAB mixture in the presence of salts are lower in magnitude compared to the aqueous medium which indicates that micellization of the CMT-CTAB mixed system is favorable in salt solution.The values of △Gm^0 were obtained to be negative indicating the spontaneity of the micellization process and the extent of spontaneity further increases by means of rising temperature.The obtained outcomes from the ΔHm^0 and ΔSm^0 values disclose that the interactions between CMT and CTAB are mostly electrostatic along with hydrophobic in nature.The thermodynamic parameters of transfer and enthalpy-entropy compensation phenomenon were also determined and discussed in detail.
文摘Cefixime, a third-generation semi-synthetic cephalosporin antibiotic was used as a copper corrosion inhibitor in 1M HNO<sub>3</sub> solution. The study was conducted through the weight loss technique at 298 - 318 K and theoretical studies based on quantum chemistry. The studied drug inhibited the corrosion of copper in 1M HNO<sub>3</sub> over the cefixime concentration range (0.02 - 2 mM). The inhibition efficiency increased with an increase in the inhibitor concentration to reach 91.07% at 2 mM, but decreased with an increase in temperature. The thermodynamic functions related to the adsorption of cefixime on the copper surface and that of the metal dissolution were computed and analyzed. The results point out spontaneous adsorption, mainly through a physisorption mechanism following Langmuir adsorption isotherm model and an endothermic dissolution process. Quantum chemical calculations were also performed at B3LYP level with 6-31G (d, p) basis set and lead to molecular descriptors such as E<sub>HOMO</sub> (energy of the highest occupied molecular orbital), E<sub>LUMO</sub> (energy of the lowest unoccupied molecular orbital), Δ<i>E</i> (energy gap) and <i>μ<span style="white-space:normal;"></span></i> (dipole moment). The global reactivity descriptors such as <span style="white-space:normal;"><i></i></span><i>χ<span style="white-space:normal;"></span></i> (electronegativity), <span style="white-space:normal;"><i></i></span><i>χ<span style="white-space:normal;"></span></i> (global hardness), <span style="white-space:normal;"><i></i></span><i>S<span style="white-space:normal;"></span></i> (global softness), and <span style="white-space:normal;"><i></i></span><i>ω<span style="white-space:normal;"></span></i> (electrophilicity index) were derived using Koopman’s theorem and analyzed. The local reactivity parameters, including Fukui functions and dual descriptors were determined and discussed. Experimental and theoretical results were found to be in good agreement.
文摘Objective:To investigate the effects of cefixime on the systemic inflammatory stress response and intestinal mucosal barrier injury in children with infective enteritis.Methods:A total of 80 children with infective enteritis who were treated in the hospital between March 2016 and August 2017 were divided into group A (n=40) and group B (n=40) according to the random number table method. Group A received cefaclor anti-infective therapy, group B received cefixime therapy, and both therapies lasted for 1 week. The differences in serum levels of inflammatory mediators, oxidative stress indexes and intestinal mucosal injury markers were compared between the two groups before and after treatment.Results: Before treatment, the differences in serum levels of inflammatory mediators, oxidative stress indexes and intestinal mucosal injury markers were not statistically significant. After 1 week of treatment, serum inflammatory mediators IL-8 and TNF-α levels of group B were lower than those of group A whereas IL-10 level was higher than that of group A;serum oxidative stress indexes ROS and MDA levels were lower than those of group A whereas GSH-Px and CAT levels were higher than those of group A;serum intestinal mucosal injury markers DAO, D-Lactate, FABP and GST levels were lower than those of group A.Conclusion: Cefixime anti-infective therapy can effectively inhibit the inflammatory stress response and reduce the intestinal mucosal barrier injury in children with infective enteritis.
文摘A 61-year-old male was admitted to our hospital due to right lower abdominal pain and watery diarrhea for 3 d.Beginning 3 wk before he arrived in our hospital,he took 3 rd-generation cephalosporin(cefixime) for 2 wk due to chronic left ear otitis media.Colonoscopic examination revealed yellowish patches of ulcerations and swelling covered with thick serosanguineous exudate in the cecum and ascending colon.After 7 d of oral metronidazole treatment,his symptoms completely disappeared.We report a case of localized pseudomembranous colitis in the cecum and ascending colon mimicking acute appendicitis associated with cefixime.
