Hesperetin,an abundant bioactive component of citrus fruits,is poorly water-soluble,resulting in low oral bioavailability.We developed new formulations to improve the water solubility,antioxidant activity,and oral abs...Hesperetin,an abundant bioactive component of citrus fruits,is poorly water-soluble,resulting in low oral bioavailability.We developed new formulations to improve the water solubility,antioxidant activity,and oral absorption of hesperetin.Two nano-based formulations were developed,namely hesperetin-TPGS(D-α-tocopheryl polyethylene glycol 1000 succinate)micelles and hesperetin-phosphatidylcholine(PC)complexes.These two formulations were prepared by a simple technique called solvent dispersion,using US Food and Drug Administration(FDA)-approved excipients for drugs.Differential scanning calorimetry(DSC)and dynamic light scattering(DLS)were used to characterize the formulations’physical properties.Cytotoxicity analysis,cellular antioxidant activity assay,and a pharmacokinetic study were performed to evaluate the biological properties of these two formulations.The final weight ratios of both hesperetin to TPGS and hesperetin to PC were 1:12 based on their water solubility,which increased to 21.5-and 20.7-fold,respectively.The hesperetin-TPGS micelles had a small particle size of 26.19 nm,whereas the hesperetin-PC complexes exhibited a larger particle size of 219.15 nm.In addition,the cellular antioxidant activity assay indicated that both hesperetin-TPGS micelles and hesperetin-PC complexes increased the antioxidant activity of hesperetin to 4.2-and 3.9-fold,respectively.Importantly,the in vivo oral absorption study on rats indicated that the micelles and complexes significantly increased the peak plasma concentration(Cmax)from 2.64μg/mL to 20.67 and 33.09μg/mL and also increased the area under the concentration–time curve of hesperetin after oral administration to 16.2-and 18.0-fold,respectively.The micelles and complexes increased the solubility and remarkably improved the in vitro antioxidant activity and in vivo oral absorption of hesperetin,indicating these formulations’potential applications in drugs and healthcare products.展开更多
This study aimed to investigate the ability of the novel materials D-α-tocopheryl poly(2-ethyl-2-oxazoline) succinate(TPOS) to construct pH-sensitive liposomes. TPOS was initially synthesized and characterized by TLC...This study aimed to investigate the ability of the novel materials D-α-tocopheryl poly(2-ethyl-2-oxazoline) succinate(TPOS) to construct pH-sensitive liposomes. TPOS was initially synthesized and characterized by TLC, FTIR, and ~1H-NMR. The buffering capacity of polyethylene glycol-distearoyl phosphatidylethanolamine(PEG-DSPE) and TPOS was determined by acid-base titration, and TPOS displayed a slower downtrend and gentler slope of titration curve than PEG-DSPE within pH 7.4–5.0. Studies on the in vitro drug release demonstrated that TPOS modified docetaxel(DOC) liposomes(TPOS-DOC-L) had a slower drugrelease rate at pH 7.4 similar to PEGylated-DOC liposomes(PEG-DOC-L), whereas the release rate reached approximately 86.92% ± 1.69% at pH 6.4. In vitro cellular uptake assays by microplate reader, and flow cytometry revealed that TPOS modified coumarin 6 liposomes(TPOS-C6-L) had stronger cellular uptake at pH 6.4 than that at pH 7.4( P < 0.01). Conversely, for PEGylated C6 liposomes(PEG-C6-L) and conventional C6 liposomes(C6-L), very similar cellular uptakes were exhibited at different pH values. Confocal laser scanning microscopy images showed that PEG-C6-L and C6-L were mainly located in lysosomes. By contrast, TPOS-C6-L showed broader cytoplasmic release and distribution at 4 h. MTT assay showed that the cytotoxicity of TPOS-DOC-L was similar to that of PEG-DOC-L and conventional DOC liposomes(DOC-L) at the same DOC concentration and at pH 7.4, but was much lower than those at pH 6.4 after 48 h of incubation. The apoptosis of PEG-DOC-L and DOC-L had no remarkable improvement with decreased pH from 7.4 to 6.4. Meanwhile, TPOS-DOC-Lsignificantly induced the apoptosis of HeLa cells with decreased pH. Therefore, TPOS can be a biomaterial for the construction of a pH-sensitive drug delivery system.展开更多
A nanomicelle(denoted as TPGS/Ppa)was fabricated via the coassembly of the amphiphilic D-α-tocopheryl polyethylene glycol 1000 succinate(TPGS)and the hydrophobic photosensitizer pyropheophorbide a(Ppa)for photodynami...A nanomicelle(denoted as TPGS/Ppa)was fabricated via the coassembly of the amphiphilic D-α-tocopheryl polyethylene glycol 1000 succinate(TPGS)and the hydrophobic photosensitizer pyropheophorbide a(Ppa)for photodynamic therapy(PDT).The obtained nanomicelle possessed a spherical structure with a diameter of(18.0±2.2)nm and a zeta potential of approximately -18 mV.Besides,the nanomicelle exhibited excellent photostability,biocompatibility,and phototoxicity,and could effectively reach the tumor region via the enhanced permeability and retention effect.Additionally,it could be found that the TPGS/Ppa nanomicelle exhibited higher phototoxicity against 4T1 murine mammary cancer cells than free Ppa.In the 4T1 tumor-bearing mouse model,the nanomicelle showed an excellent antitumor therapeutic effect.This study develops a new type of photodynamic nanomicelle TPGS/Ppa,which can increase the accumulation of drugs and prolong their tumor retention time,providing a feasible strategy for realizing the delivery of small-molecule hydrophobic drugs and tumor PDT.展开更多
为延长盐酸吉西他滨(1)的半衰期、提高生物利用度,采用逆相蒸发法制备聚乙二醇1000维生素E琥珀酸酯(TPGS)修饰的1脂质体(1-LP),并考察其性质和在大鼠体内的药动学行为。结果表明,所得1-LP的粒径为(212.6±7.2)nm、z电位为(-31.1...为延长盐酸吉西他滨(1)的半衰期、提高生物利用度,采用逆相蒸发法制备聚乙二醇1000维生素E琥珀酸酯(TPGS)修饰的1脂质体(1-LP),并考察其性质和在大鼠体内的药动学行为。结果表明,所得1-LP的粒径为(212.6±7.2)nm、z电位为(-31.1±2.9)m V、包封率为(70.56±1.92)%、载药量为(7.41±0.05)%。绘制了1-LP和1水溶液在p H 7.4磷酸盐缓冲液中的体外释药曲线,并用几种常用模型拟合试验数据。结果二者的释药数据均用双指数模型拟合效果较好(R^2为0.996和0.947)。对比研究了SD大鼠尾静脉注射给予1-LP或市售1注射液后的药动学行为。血浆中的药物浓度采用HPLC法测定。所得主要药动学参数为:t_(1/2)(4.12±0.73)和(1.32±0.10)h,AUC_(0→∞)(37.57±1.09)和(9.64±0.20)mg·L·h^(-1),MRT_(0→∞)(6.06±0.28)和(1.67±0.04)h。展开更多
目的:研究维生素E琥珀酸聚乙二醇酯(Vit E TPGS)作为一种新型乳化剂在聚酸酐紫杉醇微球中的应用,以提高微球质量。方法:以熔解浓缩聚合法制备聚[1,3-双(对羧基苯氧基)丙烷-癸二酸],利用Vit E TPGS和聚乙烯醇(PVA)分别作乳化剂,通过单乳...目的:研究维生素E琥珀酸聚乙二醇酯(Vit E TPGS)作为一种新型乳化剂在聚酸酐紫杉醇微球中的应用,以提高微球质量。方法:以熔解浓缩聚合法制备聚[1,3-双(对羧基苯氧基)丙烷-癸二酸],利用Vit E TPGS和聚乙烯醇(PVA)分别作乳化剂,通过单乳化方法制备紫杉醇微球。结果:Vit E TPGS作为微球乳化剂的用量只有0.1%,低于传统乳化剂PVA的10%,载药量和包封产率提高到8.51%,89.1%,在体外释药实验中,无明显突释现象,累积释药率达到85%。结论:相比于传统的乳化剂PVA,无论是在微球的制备还是在药物的包封产率上,Vit E TPGS都是一种更加有效安全的乳化剂。展开更多
研究了以4-二甲氨基吡啶为催化剂,由α-生育酚和琥珀酸酐合成α-生育酚琥珀酸酯(α-TOS)的酯化反应工艺和反应动力学。该合成反应最佳条件为:α-生育酚与琥珀酸酐配比为1∶3;催化剂用量1.5%;反应温度50℃;反应时间4 h,产率达84.5%,样品...研究了以4-二甲氨基吡啶为催化剂,由α-生育酚和琥珀酸酐合成α-生育酚琥珀酸酯(α-TOS)的酯化反应工艺和反应动力学。该合成反应最佳条件为:α-生育酚与琥珀酸酐配比为1∶3;催化剂用量1.5%;反应温度50℃;反应时间4 h,产率达84.5%,样品的纯度大于96%。通过对反应规律的研究,结果表明,在本实验条件下该合成反应表现为二级不可逆反应,表观活化能Ea=83.4 k J。展开更多
基金Project supported by the National Natural Science Foundation of China(Nos.51773176,51522304,and U1501243)the Natural Science Foundation of Zhejiang Province(No.LY17H300002),China
文摘Hesperetin,an abundant bioactive component of citrus fruits,is poorly water-soluble,resulting in low oral bioavailability.We developed new formulations to improve the water solubility,antioxidant activity,and oral absorption of hesperetin.Two nano-based formulations were developed,namely hesperetin-TPGS(D-α-tocopheryl polyethylene glycol 1000 succinate)micelles and hesperetin-phosphatidylcholine(PC)complexes.These two formulations were prepared by a simple technique called solvent dispersion,using US Food and Drug Administration(FDA)-approved excipients for drugs.Differential scanning calorimetry(DSC)and dynamic light scattering(DLS)were used to characterize the formulations’physical properties.Cytotoxicity analysis,cellular antioxidant activity assay,and a pharmacokinetic study were performed to evaluate the biological properties of these two formulations.The final weight ratios of both hesperetin to TPGS and hesperetin to PC were 1:12 based on their water solubility,which increased to 21.5-and 20.7-fold,respectively.The hesperetin-TPGS micelles had a small particle size of 26.19 nm,whereas the hesperetin-PC complexes exhibited a larger particle size of 219.15 nm.In addition,the cellular antioxidant activity assay indicated that both hesperetin-TPGS micelles and hesperetin-PC complexes increased the antioxidant activity of hesperetin to 4.2-and 3.9-fold,respectively.Importantly,the in vivo oral absorption study on rats indicated that the micelles and complexes significantly increased the peak plasma concentration(Cmax)from 2.64μg/mL to 20.67 and 33.09μg/mL and also increased the area under the concentration–time curve of hesperetin after oral administration to 16.2-and 18.0-fold,respectively.The micelles and complexes increased the solubility and remarkably improved the in vitro antioxidant activity and in vivo oral absorption of hesperetin,indicating these formulations’potential applications in drugs and healthcare products.
基金supported by National Natural Science Foundation of China (81102394)Natural Science Foundation of Liaoning Province (20170540575)
文摘This study aimed to investigate the ability of the novel materials D-α-tocopheryl poly(2-ethyl-2-oxazoline) succinate(TPOS) to construct pH-sensitive liposomes. TPOS was initially synthesized and characterized by TLC, FTIR, and ~1H-NMR. The buffering capacity of polyethylene glycol-distearoyl phosphatidylethanolamine(PEG-DSPE) and TPOS was determined by acid-base titration, and TPOS displayed a slower downtrend and gentler slope of titration curve than PEG-DSPE within pH 7.4–5.0. Studies on the in vitro drug release demonstrated that TPOS modified docetaxel(DOC) liposomes(TPOS-DOC-L) had a slower drugrelease rate at pH 7.4 similar to PEGylated-DOC liposomes(PEG-DOC-L), whereas the release rate reached approximately 86.92% ± 1.69% at pH 6.4. In vitro cellular uptake assays by microplate reader, and flow cytometry revealed that TPOS modified coumarin 6 liposomes(TPOS-C6-L) had stronger cellular uptake at pH 6.4 than that at pH 7.4( P < 0.01). Conversely, for PEGylated C6 liposomes(PEG-C6-L) and conventional C6 liposomes(C6-L), very similar cellular uptakes were exhibited at different pH values. Confocal laser scanning microscopy images showed that PEG-C6-L and C6-L were mainly located in lysosomes. By contrast, TPOS-C6-L showed broader cytoplasmic release and distribution at 4 h. MTT assay showed that the cytotoxicity of TPOS-DOC-L was similar to that of PEG-DOC-L and conventional DOC liposomes(DOC-L) at the same DOC concentration and at pH 7.4, but was much lower than those at pH 6.4 after 48 h of incubation. The apoptosis of PEG-DOC-L and DOC-L had no remarkable improvement with decreased pH from 7.4 to 6.4. Meanwhile, TPOS-DOC-Lsignificantly induced the apoptosis of HeLa cells with decreased pH. Therefore, TPOS can be a biomaterial for the construction of a pH-sensitive drug delivery system.
文摘A nanomicelle(denoted as TPGS/Ppa)was fabricated via the coassembly of the amphiphilic D-α-tocopheryl polyethylene glycol 1000 succinate(TPGS)and the hydrophobic photosensitizer pyropheophorbide a(Ppa)for photodynamic therapy(PDT).The obtained nanomicelle possessed a spherical structure with a diameter of(18.0±2.2)nm and a zeta potential of approximately -18 mV.Besides,the nanomicelle exhibited excellent photostability,biocompatibility,and phototoxicity,and could effectively reach the tumor region via the enhanced permeability and retention effect.Additionally,it could be found that the TPGS/Ppa nanomicelle exhibited higher phototoxicity against 4T1 murine mammary cancer cells than free Ppa.In the 4T1 tumor-bearing mouse model,the nanomicelle showed an excellent antitumor therapeutic effect.This study develops a new type of photodynamic nanomicelle TPGS/Ppa,which can increase the accumulation of drugs and prolong their tumor retention time,providing a feasible strategy for realizing the delivery of small-molecule hydrophobic drugs and tumor PDT.
文摘为延长盐酸吉西他滨(1)的半衰期、提高生物利用度,采用逆相蒸发法制备聚乙二醇1000维生素E琥珀酸酯(TPGS)修饰的1脂质体(1-LP),并考察其性质和在大鼠体内的药动学行为。结果表明,所得1-LP的粒径为(212.6±7.2)nm、z电位为(-31.1±2.9)m V、包封率为(70.56±1.92)%、载药量为(7.41±0.05)%。绘制了1-LP和1水溶液在p H 7.4磷酸盐缓冲液中的体外释药曲线,并用几种常用模型拟合试验数据。结果二者的释药数据均用双指数模型拟合效果较好(R^2为0.996和0.947)。对比研究了SD大鼠尾静脉注射给予1-LP或市售1注射液后的药动学行为。血浆中的药物浓度采用HPLC法测定。所得主要药动学参数为:t_(1/2)(4.12±0.73)和(1.32±0.10)h,AUC_(0→∞)(37.57±1.09)和(9.64±0.20)mg·L·h^(-1),MRT_(0→∞)(6.06±0.28)和(1.67±0.04)h。
文摘目的:研究维生素E琥珀酸聚乙二醇酯(Vit E TPGS)作为一种新型乳化剂在聚酸酐紫杉醇微球中的应用,以提高微球质量。方法:以熔解浓缩聚合法制备聚[1,3-双(对羧基苯氧基)丙烷-癸二酸],利用Vit E TPGS和聚乙烯醇(PVA)分别作乳化剂,通过单乳化方法制备紫杉醇微球。结果:Vit E TPGS作为微球乳化剂的用量只有0.1%,低于传统乳化剂PVA的10%,载药量和包封产率提高到8.51%,89.1%,在体外释药实验中,无明显突释现象,累积释药率达到85%。结论:相比于传统的乳化剂PVA,无论是在微球的制备还是在药物的包封产率上,Vit E TPGS都是一种更加有效安全的乳化剂。
文摘研究了以4-二甲氨基吡啶为催化剂,由α-生育酚和琥珀酸酐合成α-生育酚琥珀酸酯(α-TOS)的酯化反应工艺和反应动力学。该合成反应最佳条件为:α-生育酚与琥珀酸酐配比为1∶3;催化剂用量1.5%;反应温度50℃;反应时间4 h,产率达84.5%,样品的纯度大于96%。通过对反应规律的研究,结果表明,在本实验条件下该合成反应表现为二级不可逆反应,表观活化能Ea=83.4 k J。
