查询词典 wavelength

Guangdong college of pharmacy,guangzhou,guangdong 510006,china;henan university of traditional chinese medicine,zhengzhou,henan 450008,chinaabstract:objective to establish a method for the determination of the content of total alkaloid in nao mai tong recipe.methods acid dye colorimetry was used in the determination with bromocresol green buffer solution as the color developing agent with absorbance was determined at the detection wavelength of 417 nm.results the calibration curve of the absorbance was linear with the concentration of ligustrazine in the range of 0.031～0.153 mg/ml(r=0.9998).the average recovery of ligustrazine was 100.95％,rsd=1.75%.

作者单位：广东药学院中药化学与分析教研室，广东广州 510006；河南中医学院，河南郑州 450008 目的建立脑脉通有效部位中总生物碱的含量测定方法。方法采用酸性染料比色法，以溴甲酚绿缓冲液作为生物碱的显色剂，测定样品溶液在417 nm波长处的吸收度。结果对照品川芎嗪质量浓度在0.031～0.153 mg/ml的范围内与吸光度呈良好的线性关系，r=0.9998。平均回收率为100.95％，rsd为1.75％。精密度和稳定性良好。

MethodsThe content was determined by solvent extraction and acid dye colorimetiy, with Acanthoine Ruscope-ine （C16H22N4O2） as a control criterion and bromocresol green as the acid dye, and the wavelength was at 418 nm.

方法采用溶剂萃取酸性染料比色法测定，以去氢飞廉碱（C16H22N4O2）为对照品，溴甲酚绿为酸性染料，用氯仿萃取，检测波长418 nm。

A dual-wavelength resonance light scattering ratiometric method based on the interaction between bromothymol blue and cetylpyridinium bromide was developed for the determination of CPB.

应用双波长共振光散射比率法研究了溴百里酚蓝与阳离子表面活性剂溴化十六烷基吡啶的相互作用。

A dual-wavelength resonance light scattering ratiometric method based on the interaction between bromothymol blue and cetylpyridinium bromide was developed for the determination of CPB.

在pH 1.5的乙酸钠-HC l缓冲溶液中，CPB本身的共振光散射很弱，BTB有一定的共振光强度，加入CPB后BTB的共振光信号显著增强，最大散射峰位于523 nm，且散射光强度与CPB的浓度呈线性关系，可以通过单波长共振光散射法检测CPB，CPB质量浓度的线性范围和检出限分别为0.05~0.60 mg/L和42μg/L。

Methods:total alkaloids of radix Sophora lavescens were extracted by acidified water,then adjusted to neutral by sodium hydroxide solution, dissolved with buffer solution,then were mixed with 0.025％ of bromothymol solution and chloroform,and then the mixture was shaken,standing and demixed,the absorbability of chloroform layer was detected at the wavelength of 413nm.

将苦参的酸水提取液用氢氧化钠溶液调节至中性后，依次加入pH=7.6缓冲溶液，溴代麝香草酚蓝指示液、氯仿混合振摇，静置分层，于413 nm波长处测定氯仿层吸收度。

A determination method of ursolic acid in Callicarpa macrophylla Vahl leaves by reversed- phase high performance liquid chromtograph was established. The chromatographic column (Symmetry Shield RP18), methanol-water mobile phase(88:12, V/V) with 1.0 ml/min flow rate, the detection wavelength (210nm) and the column temperature (25℃) were adopted.

建立反相高效液相色谱测定其含量的方法，色谱柱为Symmetry Shield RP18柱，流动相为甲醇-水（体积比88∶12），流速1.0 ml/min，检测波长210 nm，柱温25℃。

A determination method of ursolic acid in Callicarpa macrophylla Vahl leaves by reversed- phase high performance liquid chromtograph was established. The chromatographic column (Symmetry Shield RP18), methanol-water mobile phase(88:12, V/V) with 1.0 ml/min flow rate, the detection wavelength (210nm) and the column temperature (25℃) were adopted.

建立反相高效液相色谱测定其含量的方法，色谱柱 Symmetry Shield RP18柱，流动相为甲醇-水（体积比88∶12），流速1.0 ml/min，检测波长210 nm，柱温25℃。

ResultThe maximumabsorption wavelength of reaction solution was about 720nm.The fermentation volume,adding the activated carbonor not,pHvalue of reaction solution and so on had no great effect onthe determinationresults and they could increase the screening efficiency.The effect of ultrasonic treatment for20min was obvious.When50ml volumetric flask was used,the suitable sampling volume was 2.5ml.It was better to centrifugate the fermentationliquid and the supernatant could be taken after standing inthe determination when necessary.

结果反应液最大吸收波长在720nm左右；发酵体积、加入活性碳与否、反应液的pH值等对测定结果影响不大，在筛选时可大大提高效率；超声波处理20min效果明显；在用50ml容量瓶进行定容时，取样体积以2.5ml为宜；对发酵液进行离心效果更好些，但在必要的情况下，可静置后取上清测定。

These results indicate that the wavelengths at adsorbing edge are affected by the content of cerous nitrate and the maximum absorption wavelength is about 481nm when the mole ratio of Ce/Ti is 1.0.For higher dosage of Cerium,the absorbance edge shifts to blue slightly.

结果表明，硝酸铈加入量影响催化剂的吸收带边，随用量增加，吸收带边红移至481nm(Ce/Ti=1.0，摩尔比)，继续增加用量，吸收带边轻微蓝移。

To study the contents of amino acids of the samples of mulberry leaves from five varieties,the amino acids of mulberry leaves were derived with o-phthaldialdehyde and 9-fluorenylmetloyl chloroformate in pre-column,and DAD variable-wavelength as measure function,and separated by RP-HPLC.

以邻苯二甲醛与9-芴基羰酰氯作衍生剂，正缬氨酸为内标利用二极管阵列可变波长检测程序，采用柱前衍生反相高效液相色谱法测定5个桑叶品种的氨基酸含量。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐