In the present study, chitosan and polyvinyl alcohol(PVA) were blended with different concentrations of sodium montmorillonite(Na^+MMT) clay solution by a solvent casting method. X-ray diffraction and transition elect...In the present study, chitosan and polyvinyl alcohol(PVA) were blended with different concentrations of sodium montmorillonite(Na^+MMT) clay solution by a solvent casting method. X-ray diffraction and transition electron microscope results show that the film properties are related to the co-existence of Na^+MMT intercalation/exfoliation in the blend and the interaction between chitosan–PVA and Na^+MMT. 5-Fluorouracil(5-FU) was loaded with chitosan–PVA/Na^+MMT nanocomposite films for in vitro drug delivery study. The antimicrobial activity of the chitosan–PVA/Na^+MMT films showed significant effect against Salmonella(Gram-negative) and Staphylococcus aureus(Gram-positive), whereas5-FU encapsulated chitosan–PVA/Na^+MMT bio-nanocomposite films did not show any inhibition against bacteria. Our results indicate that combination of a flexible and soft polymeric material with high drug loading ability of a hard inorganic porous material can produce improved control over degradation and drug release. It will be an economically viable method for preparation of advanced drug delivery vehicles and biodegradable implants or scaffolds.展开更多
In this research;the release of 5-Fluorouracil (5-FU) from different ionically crosslinked alginate (Alg) beads was investigated by using Fe3+, Al3+, Zn2+, and Ca2+, ions as crosslinking agent. The prepared beads were...In this research;the release of 5-Fluorouracil (5-FU) from different ionically crosslinked alginate (Alg) beads was investigated by using Fe3+, Al3+, Zn2+, and Ca2+, ions as crosslinking agent. The prepared beads were characterized by Fourier Transform Infrared Spectroscopy (FTIR) Differential Scanning Calorimetry (DSC) and Scanning Electron Micros-copy (SEM). The drug release studies were carried out at three pH values 1.2, 6.8 and 7.4 respectively each for two hours. The effects of the preparation conditions as crosslinker type, drug/polymer (w/w) ratio, crosslinker concentration and time of exposure to crosslinker on the release of 5-FU were investigated for 6 hours at 37℃. It was observed that 5-FU release from the beads followed the order of Fe > Zn > Al > Ca-Alg and increased with increasing drug/polymer ratio. At the end of 6 hours, the highest 5-FU release was found to be 90% (w/w) for Fe-Alg beads at the drug/polymer ratio of 1/8 (w/w), crosslinker concentration of 0.05 M, exposure time of 10 minutes respectively. The swelling measurements of the beads supported the release results. Release kinetics was described by Fickian and non-Fickian approaches.展开更多
Hepatocarcinogenesis after a sustained virological response (SVR) in type C chronic hepatitis and cirrhosis is an important issue in endemic areas; hepatocellular carcinoma (HCC) with portal vein tumor thrombus (PVTT)...Hepatocarcinogenesis after a sustained virological response (SVR) in type C chronic hepatitis and cirrhosis is an important issue in endemic areas; hepatocellular carcinoma (HCC) with portal vein tumor thrombus (PVTT) therapy is especially very hard. We herein report a first case in which combination therapy with interferon-α and continuous intra-arterial infusion of 5-fluorouracil (designated as FAIT) provided a complete response in HCC with PVTT after SVR. Therefore, we think that FAIT is a good option to treat HCC with or without PVTT, even after SVR.展开更多
目的研究氟尿嘧啶植入剂(中人氟安,Sinofuan)和注射液对胃癌细胞腹腔播散化疗疗效的差异及其机制.方法♀BALB/c(nu/nu)裸鼠,每只腹腔注射0.5 m L(含2×106个)MKN-45细胞悬液建立裸鼠腹膜移植瘤模型.选取51只成瘤裸鼠,随机数字法分...目的研究氟尿嘧啶植入剂(中人氟安,Sinofuan)和注射液对胃癌细胞腹腔播散化疗疗效的差异及其机制.方法♀BALB/c(nu/nu)裸鼠,每只腹腔注射0.5 m L(含2×106个)MKN-45细胞悬液建立裸鼠腹膜移植瘤模型.选取51只成瘤裸鼠,随机数字法分为对照组、氟尿嘧啶注射液组(2 mg/只)和氟尿嘧啶植入剂组(2 mg/只).严密观察各组裸鼠的一般状态、体质量变化和生存期,测量腹水体积,显微镜下计数每毫升腹水中的肿瘤细胞数,流式细胞仪检测腹水肿瘤细胞凋亡率.结果与对照组相比,氟尿嘧啶注射液组和氟尿嘧啶植入剂组裸鼠的一般状态良好,体质量增长缓慢,全身症状出现较晚,生存期延长(与对照组相比,均P<0.05),其中,氟尿嘧啶植入剂组中位生存期较氟尿嘧啶注射液组亦延长(25 d vs 19 d,P<0.01).氟尿嘧啶植入剂组的腹水体积少于氟尿嘧啶注射液组[(5.66 mL±1.00 mL)vs(8.78 mL±1.19 mL),P<0.01];但两组每毫升腹水中的肿瘤细胞数差异无统计学意义[(2.75×108/m L±0.71×108/m L)vs(3.46×108/mL±0.69×108/mL)].氟尿嘧啶植入剂组的肿瘤细胞凋亡率高于氟尿嘧啶注射液组(14.49%±0.80%vs 2.03%±0.64%,P<0.01).结论氟尿嘧啶植入剂对胃癌腹腔播散有更明显的抑制作用.展开更多
基金the Tshwane University of Technology for their financial support
文摘In the present study, chitosan and polyvinyl alcohol(PVA) were blended with different concentrations of sodium montmorillonite(Na^+MMT) clay solution by a solvent casting method. X-ray diffraction and transition electron microscope results show that the film properties are related to the co-existence of Na^+MMT intercalation/exfoliation in the blend and the interaction between chitosan–PVA and Na^+MMT. 5-Fluorouracil(5-FU) was loaded with chitosan–PVA/Na^+MMT nanocomposite films for in vitro drug delivery study. The antimicrobial activity of the chitosan–PVA/Na^+MMT films showed significant effect against Salmonella(Gram-negative) and Staphylococcus aureus(Gram-positive), whereas5-FU encapsulated chitosan–PVA/Na^+MMT bio-nanocomposite films did not show any inhibition against bacteria. Our results indicate that combination of a flexible and soft polymeric material with high drug loading ability of a hard inorganic porous material can produce improved control over degradation and drug release. It will be an economically viable method for preparation of advanced drug delivery vehicles and biodegradable implants or scaffolds.
基金The authors are grateful to the Gazi University Scientific Research Foundation for support of this study.
文摘In this research;the release of 5-Fluorouracil (5-FU) from different ionically crosslinked alginate (Alg) beads was investigated by using Fe3+, Al3+, Zn2+, and Ca2+, ions as crosslinking agent. The prepared beads were characterized by Fourier Transform Infrared Spectroscopy (FTIR) Differential Scanning Calorimetry (DSC) and Scanning Electron Micros-copy (SEM). The drug release studies were carried out at three pH values 1.2, 6.8 and 7.4 respectively each for two hours. The effects of the preparation conditions as crosslinker type, drug/polymer (w/w) ratio, crosslinker concentration and time of exposure to crosslinker on the release of 5-FU were investigated for 6 hours at 37℃. It was observed that 5-FU release from the beads followed the order of Fe > Zn > Al > Ca-Alg and increased with increasing drug/polymer ratio. At the end of 6 hours, the highest 5-FU release was found to be 90% (w/w) for Fe-Alg beads at the drug/polymer ratio of 1/8 (w/w), crosslinker concentration of 0.05 M, exposure time of 10 minutes respectively. The swelling measurements of the beads supported the release results. Release kinetics was described by Fickian and non-Fickian approaches.
文摘Hepatocarcinogenesis after a sustained virological response (SVR) in type C chronic hepatitis and cirrhosis is an important issue in endemic areas; hepatocellular carcinoma (HCC) with portal vein tumor thrombus (PVTT) therapy is especially very hard. We herein report a first case in which combination therapy with interferon-α and continuous intra-arterial infusion of 5-fluorouracil (designated as FAIT) provided a complete response in HCC with PVTT after SVR. Therefore, we think that FAIT is a good option to treat HCC with or without PVTT, even after SVR.
