By use of complete orthonormal sets of ψα exponential-type orbitals (ψα-ETOs, α = 1, 0,-1,-2, ...) the series expansion formulas for the noninteger n* Slater-type orbitals (NISTOs) in terms of integer n Slater-ty...By use of complete orthonormal sets of ψα exponential-type orbitals (ψα-ETOs, α = 1, 0,-1,-2, ...) the series expansion formulas for the noninteger n* Slater-type orbitals (NISTOs) in terms of integer n Slater-type orbitals(ISTOs) are derived. These formulas enable us to express the overlap integrals with NISTOs through the overlap integrals over ISTOs with the same and different screening constants. By calculating concrete cases the convergence of the series for arbitrary values of noninteger principal quantum numbers and screening constants of NISTOs and internuclear distances is tested. The accuracy of the results is quite high for quantum numbers, screening constants and location of STOs.展开更多
目的构建黄精炮制品多糖的酶水解产物指纹图谱,结合化学计量学方法评价不同蒸晒次数黄精炮制品多糖的差异。方法采用糖苷酶水解,结合高效薄层色谱(high thin-layer chromatography,HPTLC)、亲水作用色谱-高效液相色谱-蒸发光检测器(hydr...目的构建黄精炮制品多糖的酶水解产物指纹图谱,结合化学计量学方法评价不同蒸晒次数黄精炮制品多糖的差异。方法采用糖苷酶水解,结合高效薄层色谱(high thin-layer chromatography,HPTLC)、亲水作用色谱-高效液相色谱-蒸发光检测器(hydrophilic interaction liquid chromatography-high performance liquid chromatography-evaporative light scattering detector,HILIC-HPLC-ELSD)和超高效液相色谱-四级杆飞行时间串联质谱(ultra high pressure liquid chromatographyquadrupole time of flight tandem mass spectrometry,UHPLC-QTOF/MS)对相应的酶解产物进行高效分离和检测。由此产生的自下而上的指纹图谱反映了黄精炮制品多糖的变化,通过相似度和偏最小二乘-判别分析(partial least squares-discriminant analysis,PLS-DA)对指纹图谱进行综合评价。结果HPTLC分析发现,果糖随着蒸晒次数的增加逐渐降低,结合色谱分析发现,六蒸六晒和十二蒸十二晒为黄精炮制过程中的转折点。同时根据酶水解中寡糖的变化,利用相似度和PLS-DA对不同蒸晒次数的黄精炮制品进行了清晰的聚类。结合UHPLC-QTOF/MS分析表明,不同蒸晒次数黄精炮制品中含有蔗糖、蔗果三糖、蔗果四糖、蔗果五糖、蔗果六糖、蔗果七糖及蔗果八糖。结论基于酶解法分析不同蒸晒次数样品的质量动态变化,结合所建立的多元指纹图谱,进一步阐释了不同蒸晒次数黄精炮制品的科学内涵。展开更多
文摘By use of complete orthonormal sets of ψα exponential-type orbitals (ψα-ETOs, α = 1, 0,-1,-2, ...) the series expansion formulas for the noninteger n* Slater-type orbitals (NISTOs) in terms of integer n Slater-type orbitals(ISTOs) are derived. These formulas enable us to express the overlap integrals with NISTOs through the overlap integrals over ISTOs with the same and different screening constants. By calculating concrete cases the convergence of the series for arbitrary values of noninteger principal quantum numbers and screening constants of NISTOs and internuclear distances is tested. The accuracy of the results is quite high for quantum numbers, screening constants and location of STOs.
文摘目的构建黄精炮制品多糖的酶水解产物指纹图谱,结合化学计量学方法评价不同蒸晒次数黄精炮制品多糖的差异。方法采用糖苷酶水解,结合高效薄层色谱(high thin-layer chromatography,HPTLC)、亲水作用色谱-高效液相色谱-蒸发光检测器(hydrophilic interaction liquid chromatography-high performance liquid chromatography-evaporative light scattering detector,HILIC-HPLC-ELSD)和超高效液相色谱-四级杆飞行时间串联质谱(ultra high pressure liquid chromatographyquadrupole time of flight tandem mass spectrometry,UHPLC-QTOF/MS)对相应的酶解产物进行高效分离和检测。由此产生的自下而上的指纹图谱反映了黄精炮制品多糖的变化,通过相似度和偏最小二乘-判别分析(partial least squares-discriminant analysis,PLS-DA)对指纹图谱进行综合评价。结果HPTLC分析发现,果糖随着蒸晒次数的增加逐渐降低,结合色谱分析发现,六蒸六晒和十二蒸十二晒为黄精炮制过程中的转折点。同时根据酶水解中寡糖的变化,利用相似度和PLS-DA对不同蒸晒次数的黄精炮制品进行了清晰的聚类。结合UHPLC-QTOF/MS分析表明,不同蒸晒次数黄精炮制品中含有蔗糖、蔗果三糖、蔗果四糖、蔗果五糖、蔗果六糖、蔗果七糖及蔗果八糖。结论基于酶解法分析不同蒸晒次数样品的质量动态变化,结合所建立的多元指纹图谱,进一步阐释了不同蒸晒次数黄精炮制品的科学内涵。
