For beta-cyclodextrin (β-CD) may form complexes with metal ions during ballmilling process, it was used as a novel carbon source to synthesize LiFePO_4/C cathode composite in lithium-ion batteries via solid-state rea...For beta-cyclodextrin (β-CD) may form complexes with metal ions during ballmilling process, it was used as a novel carbon source to synthesize LiFePO_4/C cathode composite in lithium-ion batteries via solid-state reaction. This composite should has fine particle size and good electrochemical performances. The powders were characterized by XRD, SEM, TEM and galvanostatic charge-discharge. Compared with bare LiFePO_4 and LiFePO_4/C composite with glucose as carbon source by the same procedure and nearly the same content of carbon in the final cathode, the LiFePO_4/C composite with beta-cyclodextrin as carbon source shows much higher discharge specific capacity and more excellent rate performance. Ultrasonic dispersion between ballmilling and sinter process for 2 h was appropriate and useful for final LiFePO_4/C to reach higher discharge capacity. The SEI experiment was carried out to explore the effect of beta-cyclodextrin on the cathode materials, and the results indicate that coating with beta-cyclodextrin can improve the electrochemical performance of LiFePO_4 by decreasing the resistance of charge transfer (R_ ct) and improving the chemical diffusion coefficient (D_ Li).展开更多
运用高效液相色谱法(HPLC)联用示差折光检测器(RID)建立了黄体酮注射液中羟丙基-β-环糊精的含量测定方法。色谱柱为分子排阻色谱柱(Advance Bio SEC 130?,7.8 mm×300 mm,2.7μm),流动相为乙腈-水(20∶80),检测器为示差折光检测器(...运用高效液相色谱法(HPLC)联用示差折光检测器(RID)建立了黄体酮注射液中羟丙基-β-环糊精的含量测定方法。色谱柱为分子排阻色谱柱(Advance Bio SEC 130?,7.8 mm×300 mm,2.7μm),流动相为乙腈-水(20∶80),检测器为示差折光检测器(RID),温度为40℃,柱温为35℃,进样量为20μL,流动相的流速为0.8 m L·min^(-1)。结果表明羟丙基-β-环糊精在0.286~0.858 mg·m L^(-1)范围内线性关系良好(r=0.9999),羟丙基-β-环糊精的平均回收率为100.4%,RSD为0.4%(n=9)。通过重复性试验、加标回收试验、精密度试验、稳定性试验、耐用性试验和样品含量测定表明,所建立的方法操作简洁、准确可靠,可用于黄体酮注射液的质量控制。展开更多
The catalyst reactivity of Horseradish peroxidase was enhanced in the presence of beta-cyclodextrin. During this course, beta- cyclodextrin played a role of stabilizing the intermediates of HRP. The results have been ...The catalyst reactivity of Horseradish peroxidase was enhanced in the presence of beta-cyclodextrin. During this course, beta- cyclodextrin played a role of stabilizing the intermediates of HRP. The results have been investigated using spectra and calculation.展开更多
The interaction between ethyl orange (Eto, vip) and beta-cyclodextrin dimers (1asimilar tod, host) bridged with 2-t-butoxycarbonyl(Boc)-amino diacid was investigated. A remarkable synergic complexation of two caviti...The interaction between ethyl orange (Eto, vip) and beta-cyclodextrin dimers (1asimilar tod, host) bridged with 2-t-butoxycarbonyl(Boc)-amino diacid was investigated. A remarkable synergic complexation of two cavities in host molecule was observed.展开更多
文摘For beta-cyclodextrin (β-CD) may form complexes with metal ions during ballmilling process, it was used as a novel carbon source to synthesize LiFePO_4/C cathode composite in lithium-ion batteries via solid-state reaction. This composite should has fine particle size and good electrochemical performances. The powders were characterized by XRD, SEM, TEM and galvanostatic charge-discharge. Compared with bare LiFePO_4 and LiFePO_4/C composite with glucose as carbon source by the same procedure and nearly the same content of carbon in the final cathode, the LiFePO_4/C composite with beta-cyclodextrin as carbon source shows much higher discharge specific capacity and more excellent rate performance. Ultrasonic dispersion between ballmilling and sinter process for 2 h was appropriate and useful for final LiFePO_4/C to reach higher discharge capacity. The SEI experiment was carried out to explore the effect of beta-cyclodextrin on the cathode materials, and the results indicate that coating with beta-cyclodextrin can improve the electrochemical performance of LiFePO_4 by decreasing the resistance of charge transfer (R_ ct) and improving the chemical diffusion coefficient (D_ Li).
文摘运用高效液相色谱法(HPLC)联用示差折光检测器(RID)建立了黄体酮注射液中羟丙基-β-环糊精的含量测定方法。色谱柱为分子排阻色谱柱(Advance Bio SEC 130?,7.8 mm×300 mm,2.7μm),流动相为乙腈-水(20∶80),检测器为示差折光检测器(RID),温度为40℃,柱温为35℃,进样量为20μL,流动相的流速为0.8 m L·min^(-1)。结果表明羟丙基-β-环糊精在0.286~0.858 mg·m L^(-1)范围内线性关系良好(r=0.9999),羟丙基-β-环糊精的平均回收率为100.4%,RSD为0.4%(n=9)。通过重复性试验、加标回收试验、精密度试验、稳定性试验、耐用性试验和样品含量测定表明,所建立的方法操作简洁、准确可靠,可用于黄体酮注射液的质量控制。
文摘The catalyst reactivity of Horseradish peroxidase was enhanced in the presence of beta-cyclodextrin. During this course, beta- cyclodextrin played a role of stabilizing the intermediates of HRP. The results have been investigated using spectra and calculation.
文摘The interaction between ethyl orange (Eto, vip) and beta-cyclodextrin dimers (1asimilar tod, host) bridged with 2-t-butoxycarbonyl(Boc)-amino diacid was investigated. A remarkable synergic complexation of two cavities in host molecule was observed.
