差示分光光度法测定复方银芪降脂胶囊黄酮含量

以芦丁为观测指标 ,4 42± (1) nm处的差示分光光度与浓度的关系建立复方银芪降脂胶囊主要药效成分黄酮类化合物的含量测定方法 ,以控制产品质量。对照品在 5 .94 4— 19.2 0 8μg/ m L范围内 ,差示吸收值 (ΔA)与浓度呈良好线性关系 (r=0 .9984 ) ,回归方程为 ΔA=0 .0 6 89+0 .1130 C,平均回收率为97.78% ,RSD为 1.4 1(n=5 )。差示分光光度法具有操作简单、结果准确、重现性好等优点 ,可作为复方黄芪降脂胶囊生产质量控制检测方法。     

差示分光光度法测定排石颗粒中的总黄酮

以芦丁为观测指标,在505nm波长下,差示分光光度法测定排石颗粒中总黄酮含量。芦丁对照品在15.48—54.18μg/mL具有良好线性关系,平均加样回收率为98.05%。该方法操作简便、结果准确、重现性好,可作为排石颗粒生产质量控制检测方法。     

穿心莲中总黄酮含量的测定

以芦丁为对照品,NaNO2-Al(NO3)3-NaOH体系为显色剂,利用分光光度法测定了穿心莲中的总黄酮含量.确定了总黄酮提取方法、显色剂浓度和显色时间等.回归方程为A=0.00652 11.0329C,相关系数r=0.9997.平均回收率为104.20%,RSD=1.85%(n=5).本法操作简便,可行,重现性好.     

芫荽籽中总黄酮含量的测定

在波长510nm下,NaNO2-AlCl3-NaOH为显色剂,分光光度法测定芫荽籽中总黄酮的含量。在8—48μg/mL范围内线性关系良好,回归方程为A=0.145 7.9464C,r=0.9993,平均回收率为101.2%,RSD=1.83%(n=3)。此法简单、快速、准确。     

分光光度法测定蒙药黑冰片中微量钼

苯基荧光酮(苯芴酮)-CTMAB分光光度法测定黑冰片中钼的含量.实验结果表明,钼在0-15.029μg/mL范围内有良好的线性关系,其回归方程为:A=0.981714C585-0.157942(r=0.976).回收率为99.8%.RSD为0.948%.     

决明子复方降脂茶总蒽醌含量测定

以醋酸镁-甲醇液为显色剂,分光光度法测定决明子复方降脂茶中总蒽醌的含量.对照品在3.775-22.65μg/mL范围内,吸光度值与浓度呈良好的线性关系(r=0.9993),回归方程为A=0.01384 0.04794C,样品平均回收率为101.9%,RSD为0.75%(n=6).     

Fe(Ⅲ)-磺基水杨酸褪色光度法测定物样品中的硫普罗宁

建立了Fe(Ⅲ)-磺基水杨酸褪色光度法测定硫普罗宁的新方法.结果表明,在酸性介质中,硫普罗宁分子中的巯基(—SH)可将Fe3+还原为Fe2+,采用磺基水杨酸作为Fe3+的显色剂,借褪色分光光度法间接测定了硫普罗宁含量.显色体系最大吸收波长为480nm,硫普罗宁在0.50-4.0μg/mL浓度范围内与AA呈良好的线性关系,线性回归方程为△A=0.0065+ 13C(μg/mL),线性相关系数r=0.9997,检出限为0.00016μg/mL.方法成功用于实际药品中硫普罗宁的含量测定.     

白簕果实中总黄酮的测定

为确定白簕果实总黄酮的含量,采用超声辅助法提取白簕果实中的黄酮类化合物,以芦丁为对照,采用分光光度法在510nm处测定白簕果实中的总黄酮.回归方程为:A=1.0471C-0.0012,相关系数r=0.9997,精密度实验RSD为1.653％,稳定性实验(40min)RSD分别为2.011％(芦丁)和1.967％(白簕),平均加标回收率为101％,RSD=1.961％(n=6).采用分光光度法,操作简便,结果准确,灵敏度高,重复性好,准确测定白簕果实中总黄酮含量为76.93mg/g.     

分光光度法测定聚维酮碘中的碘

建立分光光度法测定聚维酮碘溶液中碘含量的方法。在酸性条件下,利用过氧化氢溶液将聚维酮碘溶液中结合碘转化为游离碘,用二氯甲烷萃取碘,采用分光光度法进行含量测定,碘的二氯甲烷溶液在504nm处有最大吸收,有效碘浓度在0.0001—0.002mol·L-1范围内线性关系良好(r=0.9995),平均回收率(n=9)为99.48%。该方法操作简便,结果准确,重现性好,可用于聚维酮碘溶液的质量控制。     

紫外分光光度法测定玉屏风散中黄芪甲苷的含量

用紫外分光光度法测定了玉屏风散中黄芪甲苷的含量及对其稳定性进行了研究,并对其结果进行了分析从而对本品质量进行控制.结果表明,采用紫外分光光度法测定黄芪甲苷含量,在波长为578±2nm时,浓度与吸光度呈线性关系,回归方程为y=0.080x 0.051,相关系数r2=0.9995;加样回收率为97.38%,RSD为0.86%(n=6).该法简便易行、快速准确,可作为玉屏风散中黄芪甲苷含量的测定.     

Guided-Wave Two-Dimensional Acousto-Optic Scanner Using Proton-Exchanged Lithium Niobate Waveguide

Two-dimensional scanning of a 0.6328 mum guided-light beam has been realized using noncolinear acousto-optic (AO) coplanar Bragg diffraction together with colinear AO guided-mode to substrate radiation-mode conversion in a Z-cut Xpropagation LiNbO3 proton-exchanged (PE) waveguide. The two surface acoustic (SAW) waves utilized are at the center frequencies of 500 and 200 MHz, propagating in the Y and X axes, respectively. Two-dimensional scanning of approximately 720 resolvable light beam spots, namely, 18 40 (horizontal vertical) scanning, has been demonstrated using a light beam of 1.0 mm aperture. The total number of resolvable beam spots can be greatly increased from 720 by simply utilizing SAW transducers of larger bandwidth and a light beam of greater aperture. It should also be possible to significantly increase the diffraction efficiency from 3 % by optimizing the parameters of the PE waveguide and the SAWs.     

Effect ofγ-radiation on the spectral luminescence characteristics of impure cadmium tungstate crystals

Results of a study of the effect of γ-radiation on the spectral luminescence properties of cadmium tungstate crystals doped with silver, bismuth, and molybdenum cations are presented. Spectral characteristics of the nondnnnoped crystals are briefly described. Absorption and photo and X-ray luminescence spectra of the crystals taken before and after exposure to γ-radiation (5.5·10⁴ Gy) are compared. It is found that the spectral characteristics of the crystals doped with silver, bismuth, and molybdenum cations do not change markedly after the exposure. The relation between the type of impurity-induced defects, individual characteristics of the impurity cations, and the character of the effect of γ-radiation on the spectral luminescence properties of impure crystals is analyzed (preliminarily). Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 1, pp. 55–60, January–February, 1997.     

Femtosecond Transform-Limited Pulse Generation by Compensating for the Linear Chirp of SPM Spectra in Dispersion Shifted Fibers

A simple technique of pulse compression, based on the linear chirp compensation of self-phase modulation (SPM) spectra in dispersion shifted fibers, is demonstrated. The optimization procedure is carried out, for a short span of a single-mode fiber, using a parabolic law, which describes the behavior of the squared output pulse width versus the pump peak power in the case of Gaussian pulses. The experimental results give a minimum pulse duration of 233 fs, which is in good agreement with the model. Shorter and coherent pulses, down to 90 fs, have been obtained by inserting an interference filter at the optical output.     

Sorting of bending magnets for the SSRF booster

The Shanghai Synchrotron Radiation Facility(SSRF)booster ring,a full energy injector for the storage ring,is deigned to accelerate the electron beam energy from 150MeV to 3.5GeV that demands high extraction efficiency at the extraction energy with low beam loss rate when electrons are ramping.Closed orbit distortion(COD)caused by bending magnet field uniformity errors which affects the machine performance harmfully could be effectively reduced by bending magnet location sorting.Considering the affections of random errors in measurement,both ideal sorting and realistic sorting are studied based on measured bending magnet field uniformity errors and one reasonable combination of bending magnets which can reduce the horizontal COD by a factor of 5is given as the final installation sequence of the booster bending magnets in this paper.     

Measurement of nonlinear coefficient of optical fiber based on small chirped soliton transmission

We measure the waveform and phase curves of short optical pulses before and after transmission over different lengths of fibers by use of the pulse analyzer with the frequency-resolved optical gating (FROG),and numerically simulate pulse evolution under the experimental conditions.The nonlinear coefficient of the fiber is given by comparing the experimental results with the numerical ones.Difference between the experiment and numerical simulation is analyzed.     

Resonance scattering of canonical elastic shells in absorbing fluid medium

Resonance scattering of elastic spherical shell and cylindrical shell while the surrounding fluid medium has absorption is studied. The normal mode solution derived using exact elastic theory and the separation of variables is still applicable. However, the scattering form function has to be modified for the absorbing medium, otherwise the unreasonable result would be obtained. The backscattering form function in the absorbing medium is redefined, and the form function of elastic spherical and cylindrical shell with vacuum or solid matter filled is calculated in various absorption conditions. The results show that the absorption of surrounding fluid leads to notable attenuation of the coincidence resonances in the mid-frequency, but it has a little influence on the low-frequency resonance scattering induced by the filler inside the shell.     

Single-beam self-referenced phase-sensitive surface plasmon resonance sensor with high detection resolution

A versatile and low-cost single-beam self-referenced phase-sensitive surface plasmon resonance(SPR)sensing system with ultra-high resolution performance is presented.The system exhibits a root-mean-square phase fluctuation of ±0.0028.over a period of 45 min.i.e.a resolution of±5.2×10-9 refractive index units.The enhanced performance has been achieved through the incorporation of three design elements:a true single-beam configuration enabling complete self-referencing so that only the phase change associated with SPR gets detected,a differential measurement scheme to eliminate spurious signals not related to the sensor response,and the elimination of retardation drifts by incorporating temperature stabilization in the liquid crystal phase modulato .Our design should bring the detection sensitivity of non-labeling SPR biosensing closer to that achievable by conventional fluorescence-based techniques.     

Influences of SiO2 protective layers and annealing on the laser-induced damage threshold of Ta2O5 films

Ta2O5 films are prepared on BK7 substrates with conventional electron beam evaporation deposition.The effects of SiO2 protective layers and annealing on the laser-induced damage threshold (LIDT) of the films are investigated.The results show that SiO2 protective layers exert little influence on the electric field intensity(EFI)distribution,microstructure and microdefect density but increase the absorption slightly.Annealing iS effective on decreasing the microdefect density and the absorption of the films.Both SiO2 protective layers and annealing are beneficial to the damage resistance of the films and the latter is more effective to improve the LIDT.Moreover,the maximal LIDT of Ta2O5 films is achieved by the combination of SiO2 protective layers and annealing.     

A stereo matching algorithm using multi-peak candidate matches and geometric constraints

Gray cross correlation matching technique is adopted to extract candidate matches with gray cross correla- tion coefficients less than some certain range of maximal correlation coefficient called multi-peak candidate matches. Multi-peak candidates are extracted corresponding to three closest feature points at first. The corresponding multi-peak candidate matches are used to construct the model polygon. Correspondence is determined based on the local geometric relations between the three feature points and the multi-peak candidates. The disparity test and the global consistency checkout are applied to eliminate the remaining ambiguous matches that are not removed by the local geometric relational test. Experimental results show that the proposed algorithm is feasible and accurate.