Determination of tranexamic acid in tranexamic acid capsules by HPLC

目的建立用于测定氨甲环酸胶囊中氨甲环酸含量的HPLC法。方法采用Karomasil-C_(18)ODS(250 mm×4.6 mm,5μm)色谱柱。流动相为磷酸盐缓冲液(pH值为2.5)-甲醇(60:30,V/V);检测波长:220 nm,流速:1.0 mL·min~(-1)。结果线性范围0.4～2.0 g·L~(-1),r=0.999 4。回收率为100.7%,RSD=0.64%(n=6)。结论本方法简便,精确,重现性好,可用于控制氨甲环酸胶囊中氨甲环酸的内在质量。AIM To establish a method for the determination of the content of tranexamic acid in tranexamic acid capsules by HPLC.METHODS A Karomasil-C_(18)ODS(250 mm×4.6 mm,5μm)was used.The mobile phase was phosphate buffer solution(pH=2.5)-methanol(60:30,V/V).The determination wave length was 220 nm and the flow- rate was 1.0 mL·min~(-1).RESULTS The method was linear within the range of 0.4-2.0 g·L~(-1);r=0.999 4.The av- erage recovery rate was 100.7%(RSD=0.64%,n=6).CONCLUSION The method is easy,rapid,accurate and re- producible.It can be a quality control standard for tranexamie acid capsules

The present invention relates to an in-situ miniature lysimeter for intelligent irrigation

本实用新型属于蒸渗仪技术领域，具体涉及一种智能灌溉的原位小型蒸渗仪，包括保护筒、防尘板、土柱桶、钢丝绳、引流器、支座、淋溶液采集器、称重机构、管道、水势传感器、抽水泵、取样器、信号线、控制器、控制线、电子水表、水管，所述保护筒埋设于地面以下，所述保护筒内设置有称重机构，所述称重机构上设置有支座，所述支座上接触有土柱桶，所述土柱桶上设置有引流器。本实用新型将主体装置置于地下环境，能够降低土柱内环境温度、水分等条件与实际环境条件偏差，最大限度模拟土壤环境条件，利于准确描述土壤水分运动过程和研究作物蒸腾耗水规律；通过小型原位蒸渗仪与智能灌溉系统结合，能最大程度模拟作物栽培条件和稳定土壤水分下实际蒸散量

An in-situ soil column plant culture and drenching solution collector

本实用新型公开了一种原位土柱植物培养及淋溶液采集装置，涉及植物培养技术领域，包括：保护筒，所述保护筒呈垂直状态安置在田间地下土壤中，所述保护筒的顶端设置有防护板，所述防护板的外壁还设置有取样器；土柱筒支架，所述土柱筒支架固定设置在所述保护筒的内腔底端；淋溶液采集组件，所述淋溶液采集组件安置在所述土柱筒的内侧；土柱筒，所述土柱筒放置在所述土柱筒支架的顶端，所述土柱筒的内壁上端还设置有水分传感器；采样导管，所述采样导管布置在所述土柱筒和所述保护筒之间的间隙中。该原位土柱植物培养及淋溶液采集装置，本装置采用田间土壤的真实布置环境，可以更好地模拟土壤中水分和污染物质的迁移及其分布情况

2-苯甲酰吡啶的低温热容及其热力学性质研究

2-benzoylpyridine is an important raw material and intermediate, which has been used in the synthesis of many organic compounds. In order to better understand the process of chemical reaction of this compound, develop its new application and carry out relevant theoretical research, the thermodynamic properties are needed. The heat capacities of 2-benzoylpyridine were measured with an automated adiabatic calorimeter over the temperature range from 80 to 370 K. The melting point, molar enthalpy, fusHm, and entropy, fusSm, of fusion of this compound were determined to be 316.38 K, 23.181 kJ mol-1 and 64.145 J mol-1 K-1, respectively. The purity of the compound was calculated to be 99.60 mol% by using the fractional melting technique. The thermodynamic functions relative to the reference temperature (298.15 K) were calculated based on the heat capacity measurements in the temperature range between 80 K and 370 K. The thermal properties of the compound were further investigated by differential scanning calorimetry (DSC). From the DSC curve the molar enthalpy and entropy of evaporation of this compound were determined to be 51.3±0.2 kJ mol-1 and 99.1±0.4 J mol-1 K-1, respectively

4-羟甲基吡啶的热力学性质

用精密自动绝热量热计测定了4-羟甲基吡啶在79～380K温区的摩尔热容．实验结果表明，该化合物在79-301K温区无相变和热异常现象发生，在301～331K，发生固-液相变，其熔化温度、摩尔熔化焓及摩尔熔化熵分别确定为：325．12K，11．78kJ·mol^-1和36．23J·K^-1．mol^-1．根据热力学函数关系式，从热容值计算了4-羟甲基吡啶在80-380K温区以标准状态(298．15K)为基准的热力学函数值．用热重法(TG)对该化合物的热稳定性作进一步考察，从TG曲线上观察到该化合物在490K有最大的蒸发失重速率

2氨基46二甲氧基嘧啶的低温热容和势力学性质研究

通过精密自动绝热量热计测定了自行合成并提纯的2-氨基-4，6-二甲氨基嘧啶在78-394 K温区的摩尔热容。实验结果表明，该化合物有一个固-液溶化相变，其熔化温度、摩尔熔化焓以及摩尔熔化熵分别为：（370.97 ± 0.02）K，（29853.91 ± 9.25） J·mol~(-1)和（80.45 ± 0.03）J·mol~(-1) · K~(-1)。通过分步熔化法得到样品的纯度为0.9984 (摩尔分数)和绝对纯样品的熔点为371.031 K。在热容测量的基础上计算出了该物质每隔5K的热力学函数值。DSC技术对基固-溶熔化过程作了进一步研究，结果与热容试验相一致

2氨基46二甲氧基嘧啶的低温热容和势力学性质研究

通过精密自动绝热量热计测定了自行合成并提纯的2-氨基-4，6-二甲氨基嘧啶在78-394 K温区的摩尔热容。实验结果表明，该化合物有一个固-液溶化相变，其熔化温度、摩尔熔化焓以及摩尔熔化熵分别为：（370.97 ± 0.02）K，（29853.91 ± 9.25） J·mol~(-1)和（80.45 ± 0.03）J·mol~(-1) · K~(-1)。通过分步熔化法得到样品的纯度为0.9984 (摩尔分数)和绝对纯样品的熔点为371.031 K。在热容测量的基础上计算出了该物质每隔5K的热力学函数值。DSC技术对基固-溶熔化过程作了进一步研究，结果与热容试验相一致