HPLC法测定卡络磺钠葡萄糖注射液的含量

采用Kromasil-C18色谱柱(250×4.6mm,5μm),流动相为0.12%磷酸二氢铵溶液(用磷酸调节pH值至3)-无水乙醇(85∶15),检测波长为363nm,流速为1.0mL/min,HPLC法测定卡络磺钠葡萄糖注射液含量。结果表明,卡络磺钠在0.080—0.120mg/mL浓度范围内,峰面积与浓度呈良好的线性关系(r=0.9995),平均回收率为100.35%。所建方法简便,专属性及精密度好,可用于卡络磺钠葡萄糖注射液的含量测定。     

反相高效液相色谱法测定合成产物2-硝基芴酮的含量

建立了一种反相高效液相色谱法测定2-硝基芴酮含量的方法。液相色谱条件为:EliteHypersil ODS2C18色谱柱(4.6mm×250mmi.d.,5μm),甲醇-四氢呋喃-水为流动相(体积比为65∶15∶35)。在流速1.0mL/min,检测波长254nm,柱温25℃条件下,产物2-硝基芴酮与原料芴酮、副产物2,7-二硝基芴酮在2-硝基芴酮浓度为5—30mg/L范围内分离效果良好,峰面积与质量浓度呈良好的线性关系,相关系数为0.9985;平均回收率值大于99.00%,相对标准偏差小于1.00%。结果表明,该方法具有操作简便、精密度和准确性高的特点,可适用于工业生产2-硝基芴酮含量的测定。     

RP-HPLC法测定感冒复方中药制剂中的甘草酸含量

色谱柱用Alltima C18 5μ(Lot No.2980 Part No.88056 Length 250mm Serial No.02060484.1 ID 4.6mm),流动相V(甲醇)∶V(水)∶V(乙酸)=65∶35∶2(pH至5.6),紫外检测波长254nm;流速0.8mL/min;柱温45℃,反相高效液相色谱法测定新型感冒复方中药制剂中甘草酸含量.甘草酸的浓度在3-86μg/mL之间与峰面积线性关系良好(r=0.9998),平均回收率为100.9%,方法精密度RSD=0.36%(n=5).方法准确、简便、回收率和重现性较好,为新型感冒复方中药制剂的质量控制提供了可靠依据.     

反相高效液相色谱法测定尿中α-萘酚、β-萘酚、对硝基酚和间硝基酚

利用反相高效液相色谱法建立了同时检测人尿样中的α-萘酚、β-萘酚、对硝基酚和间硝基酚的新方法。采用DiamonsilTMC18（150mm×4.6mm,5μm）色谱柱分离,以V（甲醇）∶V（乙酸铵缓冲液）=58∶42为流动相,流速为0.75mL/min,柱温为35℃,于波长280nm处检测。当α-萘酚、β-萘酚、对硝基酚和间硝基酚的浓度分别在0.120—19.44、0.106—19.44、0.479—27.80μg/mL和0.439—27.80μg/mL范围内与峰面积呈良好线性关系,RSD分别为3.7%—4.3%、2.4%—3.6%、2.7%—4.9%和2.9%—3.6%（n=5）。本法用于尿中4种物质的同时测定,回收率分别为98.8%、103.8%、97.5%和105.0%,结果满意。     

RP-HPLC测定黄毛楤木中的紫丁香苷和刺五加苷E

研究RP-HPLC同时定量分析黄毛楤木中紫丁香苷和刺五加苷E的含量。采用色谱柱为NUCLEODUR 100-5 C18ec柱(4.6mm×250mm,5μm),流动相为乙腈∶水(15∶85,V/V),流速0.8mL.min-1,检测波长221nm,柱温30℃。紫丁香苷进样量在0.01364—0.15004μg范围内,与峰面积呈良好的线性关系(r=0.9999),平均回收率为96.8%,RSD为2.5%(n=6);刺五加苷E进样量在0.02940—0.32340μg范围内,与峰面积呈良好的线性关系(r=0.9999),平均回收率为97.9%,RSD为1.9%(n=6)。本方法操作简便,测定结果准确可靠,可同时测量黄毛楤木中紫丁香苷和刺五加苷E的含量。     

黑龙江膜荚黄芪多糖提取与含量测定

研究了水提醇沉法制备的黄芪多糖提取物,采用苯酚-硫酸比色法测定多糖的含量,在0.00-0.14mg/mL线性范围内具有良好的线性关系,本法的RSD为0.98%.回收率在94.8%-103.5%之间.测定黄芪多糖含量为4.3%.此方法显色快速,反应稳定性较好,准确度、精密度较高.     

HPLC测定阿莫西林胃粘附制剂在大鼠胃内的组织残留量

采用Phenomenex Luna C18柱(4.6mm×250mm,5μm),KH2PO4(0.02mol/L,pH 5.0±0.1)-乙腈(96∶4,V/V)为流动相,对乙酰氨基酚为内标,检测波长254nm,流速1.0mL/min,柱温30℃,高效液相色谱法(HPLC)测定自制阿莫西林胃粘附制剂在SD大鼠胃内的组织残留量。结果表明,阿莫西林浓度在0.52—31.38μg/mL的范围内与阿莫西林峰面积和对乙酰氨基酚峰面积之比线性关系良好(r=0.9996),检出限为0.2μg/mL,平均回收率在98.10%—101.19%之间;日内、日间精密度小于5%,测定方法稳定、可靠,专属性强,适用于生物组织样品中阿莫西林的测定。     

超声提取-反相高效液相色谱法测定黄姜中薯蓣皂甙元

以超声萃取-酸水解-超声萃取进行预处理,结合RP-HPLC测定黄姜中薯蓣皂甙元含量。色谱条件为:采用AglilengtHC-C18色谱柱,流动相为甲醇∶水=95∶5(V∶V),流速为1.0mL/min,UV检测波长为203nm。结果表明,在40—1000μg/mL范围内,薯蓣皂甙元峰面积与其质量浓度具有良好的线性关系(r=0.9996),样品平均加标回收率为99.8%,RSD为1.1%。与直接酸水解-萃取预处理方式进行对比,本方法测得薯蓣皂甙元含量提高了32%。采用本方法对黄姜芽,根茎,表皮及不定根中的薯蓣皂甙元含量进行测定:根茎1.69%,芽0.19%,表皮0.15%,不定根部分含量为0.36%。     

高效液相色谱法测定和厚朴酚白蛋白纳米粒中的药物含量

建立高效液相色谱法测定和厚朴酚白蛋白纳米粒中和厚朴酚的含量.采用Lichrospher C118(4.6mm×150mm,5μm)色谱柱,流动相为甲醇-水(80 ∶ 20,V/V),流速为1.0mL/min,检测波长为294nm,柱温为30℃.在此色谱条件下,和厚朴酚的色谱峰面积与质量浓度在0.048-12.5μg/mL范围内线性关系良好(r=0.9999),平均回收率为101.2％,RSD为0.5％.本法准确可靠、简便易行,可用于和厚朴酚白蛋白纳米粒中和厚朴酚的含量测定.     

高效液相色谱法测定三姐妹中的齐墩果酸和熊果酸

应用高效液相色谱法同时测定三姐妹中齐墩果酸和熊果酸两种三萜酸类成分的含量.采用Kromasil C18色谱柱(4.6mm×250mm,5μm),以甲醇∶水∶磷酸(90:10∶0.1,V/V/V)为流动相,流速1.0mL·min-1,紫外检测波长210nm,柱温30℃.齐墩果酸进样量在0.684-6.84μg时,与峰面积呈良好的线性关系(r=0.9999),平均回收率为98.3％,RSD为1.9％(n=5);熊果酸进样量在1.064-10.64μg时,与峰面积呈良好的线性关系(r=0.9998),平均回收率为97.2％,RSD为2.4％(n=5).方法准确,操作简便,数据可靠,可用于三姐妹中齐墩果酸和熊果酸的含量测定.     

Hybrid Wavelength and Code Division Multiple Access in Optical Networks

A review of schemes for multiple access in fiber optic networks shows that a hybrid of wavelength and code division multiple access (WCDMA) combines the best features of both. In particular, the hybrid scheme retains the large information carrying capacity of wavelength division multiple access (WDMA) and flexibility of code division multiple access (CDMA). In this paper WDMA, optical CDMA (OCDMA), and WCDMA networks are discussed. In OCDMA networks, concept of incoherent and coherent coding including inverse decoding and matched filter is introduced. The delay performance of both WDMA and WCDMA networks, under the simple suboptimum access protocols based on cyclic search, is computed. It has been shown quantitatively that tuning delay significantly affects the delay performance of both WDMA and WCDMA networks. Futhermore, delay performance of WCDMA networks is always better than the WDMA networks for the same tuning delay, load, and number of users.     

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.     

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.     

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.     

Research on beamforming method for dual-line array with space mismatch between the two line arrays

The performance of port/starboard discrimination of dual-line array will be seriously degraded when the space between the two line arrays of the dual-line array is mismatched. The directivity function of the delay-sum and delay-subtract beamforming is deduced and the port/starboard discrimination of the delay-sum and delay-subtract beamforming is also studied both under the ideal status and the status under which the space between the two line arrays of the dual-line array is mismatched. Analysis results show the delay-subtract beamforming has better performance of port/starboard discrimination. At last, the sea trial results demonstrate the theoretical results.     

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.     

Retrieval of ultraviolet skylight radiances and O3 slant column densities from balloon-borne limb spectrometer

With a novel light-weight and absolutely calibrated ultraviolet （UV） spectrometer, UV skylight radiances and O3 slant column densities are measured by balloon-borne limb measurements in Xinjiang area, China. UV skylight radiances measured at the height of 31 km are compared with the results from Modtran in the wavelength range from 290 to 420 nm. O3 slant column densities are derived from radiance spectra in the Huggins bands （320 - 335 nm） using differential optical absorption spectroscopy method. And the parameter exhibits a good correlation with the same value simulated by radiative transfer model （Tracy）. The O3 profile simultaneously measured by an O3 sonde is used as input in Tracy calculations. The O3 sonde is launched on the same balloon.     

Design optimization of highly sensitive LSPR enhanced surface plasmon resonance biosensors with nanoholes

For breaking through the sensitivity limitation of conventional surface plasmon resonance (SPR) biosensors, novel highly sensitive SPR biosensors with Au nanoparticles and nanogratings enhancement have been proposed recently.But in practice, these structures have obvious disadvantages.In this study, a nanohole based sensitivity enhancement SPR biosensor is proposed and the influence of different structural parameters on the performance is investigated by using rigorous coupled wave analysis (RCWA).Electromagnetic field distributions around the nanohole are also given out to directly explain the performance difference for various structural parameters.The results indicate that significant sensitivity increase is associated with localized surface plasmons (LSPs) excitation mediated by nanoholes.Except to outcome the weakness of other LSP based biosensors, larger resonance angle shift, reflectance amplitude, and sharper SPR curves' width are obtained simultaneously under optimized structural parameters.     

Polymer gratings based on photopolymerization for low-order distributed feedback polymer lasers

Novel polymer distributed feedback(DFB)gratings are fabricated based on photopolymerization to reduce lasing threshold of polymer lasers.A photopolymer formulation sensitive to 355-nm ultraviolet(UV)light is proposed for the fabrication of polymer gratings and it can be used to form polymer films by spin-coating process.A very low surface-relief depth ranging from 12.5 to about 1.0 nm has been demonstrated with a refractive-index modulation of about 0.012.The experimental results indicate that such polymer gratings have promising potentials for the fabrication of low-order DFB organic semiconductor lasers.     

A novel methodology for photometric compensation of projection display on patterned screen

We propose a novel methodology based on the projector-camera (ProCam) system to address the photometric compensation issue for the projection display on the patterned screen.The patterned screen is treated as the combination of a perfect white screen and a color modulator.The perfect white screen is used to automatically and accurately characterize the ProCam system offline using the polynomial model,and the parameters of the color modulator can be efficiently recovered by employing only two gray images based on the linear reflectance model.The experimental results show that the color artifacts of the display image can be greatly improved with this methodology,which demonstrates its feasibility and validity in the photometric compensation.