亲水性材料固相萃取-紫外导数光谱法检测血中茚满二酮灯抗凝 …

本文报导了血中茚满二酮类抗凝血杀鼠剂敌鼠、氯敌鼠、杀鼠酮的亲水性材料固相萃取－紫外导数光谱检测法。血样用pＨ５缓冲液等体积稀释后加于西雷脱硅藻土柱上,柱用乙酸乙 酯洗脱,将洗脱液挥发干净,剩余物用pＨ１０缓冲液溶解,测定所得溶液的二阶导数光谱进行定性和定量分析。三种杀鼠剂以１０mg／Ｌ的量加于空白血中测得萃取率为８５％以上,血中三种杀鼠剂的检出限低于２ｍｇ／Ｌ。萃取中亲水性硅藻土可用硅胶和氧化铝代替,     

流动注射在线萃取-有机相ICP-AES法测定矿石中的痕量金

提出了一种流动注射在线萃取－有机相ＩＣＰ－ＡＥＳ法测定矿石中痕量金的分析方法,研究了流动注射在线萃取与ＩＣＰ－ＡＥＳ法的联用技术,设计了在线萃取流路,优化了各项化学条件及流路参数。该方法操作简便,快速,检出限为０．００１μｇ／ｍＬ,相对标准偏差（ＲＳＤ）为３．４％,应用于矿石中痕量金的分析,获得满意的结果。     

高纯氧化钆中14种稀土杂质元素的柱色谱分离ICP-AES法测定

用Ｐ５０７萃淋树脂柱色谱法分离高纯氧化钆基体与稀土杂质。用ＩＣＰ－ＡＥＳ法测定高纯氧化钆中微量稀土杂质。选择了柱色谱分离的合适条件。优化了仪器测定参数。使本方法测定稀土总量下限小于１×１０－５％。可以满足９９．９９９９％高纯氧化钆的测定。此方法回收率在８５％－１１０％之间。相对标准偏差小于１８％。     

聚乙二醇-钍试剂-硫酸钠体系中非有机溶剂萃取光度法测定铁

本文研究了铁（Ⅲ）－ＰＥＧ（聚乙二醇－２０００）－钍试剂－Ｎａ２ＳＯ４体系的析相光度法并应用于测定Ｆｅ（Ⅲ），最适酸度为４．６（ＮａＡｃ－ＨＡｃ）缓冲溶液，其络合物的最大吸收位于５６６ｎｍ，表观摩尔吸光系数为８．０６×１０３Ｌ·ｍｏｌ－１·ｃｍ－１。Ｆｅ（Ⅲ）浓度在０—３０μｇ·ｍＬ－１范围内服从比耳定律，该方法用于发样中铁的测定，获得了满意结果     

Comparison between the use of polyether ether ketone and stainless steel columns for ultrasonic-assisted extraction under various ultrasonic conditions

The ultrasound-assisted extraction (UAE) was conducted using the stainless steel (SS) and polyether ether ketone (PEEK) columns and analyzed with high-performance liquid chromatography (HPLC) to understand the mechanism of ultrasound-assisted chromatography (UAC). Empty SS and PEEK columns were used to extract dyes from a fabric under identical conditions with several parameters including the initial ultrasonic bath temperatures (30 °C and 40 °C), ultrasound power intensities (0, 20, 40, 60, 80, and 100 %), ultrasound operation modes (normal and sweep), and ultrasound frequencies (25 kHz, 40 kHz, and 132 kHz) to compare their extraction capabilities. After 30 min of extraction, the amount of extract was determined by HPLC. The PEEK material was significantly affected by ultrasonic radiation compared to the SS material, especially at a higher temperature (40 °C), power intensity (100 %), and frequency (132 kHz) with sweep mode. At a maximum power density of 45 W/L, the extraction effectiveness ratio of PEEK to SS was in the range of 1.8 - 3.9 depending on the specific frequency, initial temperature, and with or without temperature control. The most optimal ultrasound frequencies, in terms of enhancing extraction effectiveness, are in the order of 132 kHz, 40 kHz, and 25 kHz. Unlike the SS material, the PEEK material was more affected by temperature and acoustic effects under identical conditions, especially at 132 kHz ultrasound frequency. In contrast, at lower frequencies of 40 kHz and 25 kHz, no significant differences in the acoustic effects were observed between the PEEK and SS materials. The findings of this study contribute to elucidating the roles of column materials in UAE and UAC.     

不同提取方法对菟丝子总黄酮和金属元素锌的含量比较研究

分别采用常规回流提取法、石油醚脱脂-索氏提取法和微波辅助萃取法对中药菟丝子进行提取;以芦丁为对照品,紫外分光光度法测定提取物中总黄酮的含量;原子吸收光谱法测定提取液中金属元素锌的含量,以总黄酮的含量和金属元素锌的含量为考察指标,明确金属元素锌的提取与黄酮类总含量之间的关系。结果表明,3种提取方法中,微波辅助萃取法具有高效、省时等优点,提取效果最好,锌元素的含量与总黄酮的含量成正比。     

二(2-乙基己基)磷酸络合萃取对氨基苯酚

二 (2 -乙基己基 )磷酸 (D2 EHPA)络合萃取对氨基苯酚 (PAP)。研究了稀释剂种类、溶液的初始 p H值等因素对稀溶液分配比 (D)的影响。溶液的初始 p H值 (p H2— 1 1 )对萃取结果影响较大 ,当初始 p H值在p Ka1 和 p Ka2 之间时 ,分配比出现峰值。稀释剂则主要是通过物理萃取实现。在同一浓度下 ,二 (2 -乙基己基 )磷酸的萃取能力随稀释剂的极性增大而提高 ,极性环境明显优于惰性稀释剂环境。红外光谱分析表明 ,络合萃取过程存在离子交换和离子缔合两种反应机制。     

蒙成药如达多糖的研究

从蒙成药如达中提取水溶性多糖,硫酸-苯酚法测定其含量。平均回收率为99.8%,RSD为0.94%。GC测定了水溶性多糖的组成为葡萄糖、半乳糖和甘露糖。其摩尔比为:6.33:3.25:1.59。     

PAN浊点萃取-火焰原子吸收光谱法测定水样中的痕量钴

提出了浊点萃取-火焰原子吸收光谱法测定痕量钴的新方法。探讨了溶液pH,试剂浓度等实验条件对浊点萃取及测定灵敏度的影响。在最佳条件下,富集50mL样品溶液,用火焰原子吸收光谱法测定,钴的检出限为0.22μg/L,钴的富集倍率为68倍。方法用于自来水、井水及海水中痕量钴的测定。     

The direct effect of ultrasound on the extraction of date syrup and its micro-organisms

In the date syrup industry, date fruits are mixed with a suitable amount of water at a temperature greater than 50 °C for about 1 h. This condition is not sufficient for killing the micro-organisms present in the fruit. In addition, Overheating for a long time can damages nutritious materials and also changes the final product's color. Ultrasound was applied for improving the quantity and quality of the extraction, and also to overcome the health problem. In this research, the following variables were examined: date fruit/water ratio, ultrasonic intensity and temperature. The results showed that sonication under the proper conditions can lead to a higher extraction in a shorter time with a better physical quality of the product. Most importantly, the sonication significantly decreased the microbial count in comparison to the classical method. This study also confirmed the presence of anti-microbial substances in date fruit, and that ultrasonic waves can accelerate their effects.