~(131)I-Lym-2单克隆抗体实验研究

不同浓度的~(131)I-Lym-2 MoAb与ARH-77和CEM细胞进行结合试验,结果表明:随浓度增大,结合值均升高;实验组裸鼠模型9只获得动力学数据。实验组和对照组注射~(131)I-Lym-2 MoAb后144h解剖,进行生物学分布(％D/g)测定,实验组肿瘤为16.88±12.64,肌肉为0.72±0.56。结果表明,~(131)I-131-Lym-2MoAb对临床B细胞淋巴瘤的放射免疫分析、显像有良好的效果。     

同位素稀释-气相色谱-串联质谱法同时测定肉制品中16种欧盟优控多环芳烃

目的 基于分子印迹特异性净化及同位素稀释-气相色谱-串联质谱法建立同时检测肉制品中16种欧盟优控多环芳烃的分析方法。方法 样品中加入氘代同位素内标,经正己烷-二氯甲烷(7:3, V:V)混合溶液提取,特异性分子印迹柱净化,采用DB-EUPAH色谱柱分离,在多反应监测(multiple reaction monitoring, MRM)模式下采集,内标法定量。结果 为降低基质效应,采用基质匹配标准曲线的定量方法。在0.2～200.0 ng/mL范围内,16种欧盟优控多环芳烃均有良好的线性关系,线性相关系数(r²)均大于0.9990,在1.0、5.0、10.0μg/kg3个浓度水平下进行加标回收实验, 16种欧盟优控多环芳烃的回收率在85.9%～118.3%之间,相对标准偏差(n=6)在0.4%～6.6%之间,方法的检出限为0.03～0.10μg/kg,定量限为0.10～0.30μg/kg。结论 该方法前处理简便高效、灵敏度高、准确度高、抗干扰能力强,可同时实现肉制品中16种欧盟优控多环芳烃的测定。     

我国与主要贸易国家间猪肉中农药残留限量对比分析

掌握不同国家、地区猪肉中农药最大残留限量（Maximum Residue Limits，MRL）要求现状，分析其差异性，以便降低猪肉贸易风险。收集我国和主要贸易国家，联合国粮农组织食品法典委员会（Codex Alimentarius Commission，CAC）、澳大利亚、美国、日本、新西兰、欧盟现行的猪肉农药MRLs标准和技术法规进行对比分析。由于各国饮食习惯、膳食结构不同，我国与主要贸易国家之间存在农药MRL差异，主要表现在：部分农药残留物的定义中所包含的农药转化物、代谢物、反应产物等的不同；农药最大残留限量指标数量和品种的不同，其中我国与欧盟、日本和澳大利亚等国在指标数量上差异较大；相同农药残留限量指标的宽严程度不同，个别指标差异较大。我国应继续加强国际间猪肉农药残留限量标准制定交流，进一步完善我国猪肉农药残留限量标准体系。     

Complications of home hemodialysis

Home hemodialysis is regaining popularity as a treatment choice for end-stage kidney disease. This trend is fueled by numerous reports of better survival and improved quality of life with primarily home-based more frequent and/or longer hours of hemodialysis. Home hemodialysis in the contemporary era is generally very safe. Advances in machine technology have reduced technical complications and longer and more frequent treatments have reduced the risk of hypotension and cardiovascular instability. A successful home hemodialysis program must focus on patient safety to prevent serious hemorrhage from needle dislodgement and enable an aseptic cannulation technique. In addition, vigilance in relation to machine maintenance procedures and attention to water quality are key skills that patients must acquire for optimal outcomes. The possibility of increased septic events with longer and more frequent hemodialysis regimens performed in the home, the long-term psychosocial effects of home hemodialysis, and the best methods for maintaining compliance of patients in the long term are of particular contemporary interest.     

气相色谱-串联质谱法测定婴幼儿配方乳粉中的丙烯酰胺

建立了婴幼儿配方乳粉中丙烯酰胺的气相色谱-串联质谱的测定方法。样品经水溶解后,用乙酸锌、亚铁氰化钾沉淀蛋白,离心,上清液经溴化衍生后经乙酸乙酯提取,采用气相色谱-串联质谱进行定性定量检测,内标法定量。结果表明,丙烯酰胺浓度为5~500 ng/mL时线性良好（＞0.999）,在10 ~ 40 μg/kg水平的加标回收率为89.4 %~107.2 %,相对标准偏差为3.3 %~7.1%（n=6）,检出限为0.25μg/kg,定量限为0.75μg/kg。该方法线性良好、灵敏度、准确度高,抗干扰能力强,适合婴幼儿配方乳粉中痕量丙烯酰胺的测定。     

Acute bovine laminitis: a new induction model using alimentary oligofructose overload

Twelve dairy heifers were used to examine the clinical response of an alimentary oligofructose overload. Six animals were divided into 3 subgroups, and each was given a bolus dose of 13, 17, or 21 g/kg of oligofructose orally. The control group (n = 6) was sham-treated with tap water. Signs of lameness, cardiovascular function, and gastrointestinal function were monitored every 6 h during development of rumen acidosis. The heifers were euthanized 48 and 72 h after administration of oligofructose. All animals given oligofructose developed depression, anorexia, and diarrhea 9 to 39 h after receiving oligofructose. By 33 to 45 h after treatment, the feces returned to normal consistency and the heifers began eating again. Animals given oligofructose developed transient fever, severe metabolic acidosis, and moderate dehydration, which were alleviated by supportive therapy. Four of 6 animals given oligofructose displayed clinical signs of laminitis starting 39 to 45 h after receiving oligofructose and lasting until euthanasia. The lameness was obvious, but could easily be overlooked by the untrained eye, because the heifers continued to stand and walk, and did not interrupt their eating behavior. No positive pain reactions or lameness were seen in control animals. Based on these results, we conclude that an alimentary oligofructose overload is able to induce signs of acute laminitis in cattle. This model offers a new method, which can be used in further investigation of the pathogenesis and pathophysiology of bovine laminitis.     

~(131)Cs在心肌中浓集的实验研究

~(131)Cs心肌浓集实验使用动物332只,包括狗289只和家兔43只。其中,279只狗作为实验性急性心肌梗塞、冠状动脉供血不足,并以野菊花等十三种中草药进行治疗。所有十三种中草药均能使实验模型的病变区明显缩小,且能明显改善病变区的病变程度,其中以野菊花的疗效最佳。 本文结果说明,在心肌损伤和局部供血不足的情况下,则该区域心肌的~(131)Cs含量相应减少。因此心肌对放射性~(131)Cs的摄取不仅与该区域心肌的冠状血液循环有关,且与该区域心肌细胞的状态有关。故放射性核素~(131)Cs的示踪研究是观察实验性急性心肌梗塞、冠状动脉供血不足情况下,某些中草药或其它疗法的疗效的一种敏感、有效和简便的方法之一。     

QuEChERS-气相色谱-质谱法对植物油中农药残留的快速检测

建立植物油中8种常见农药的快速检验方法。样品采用液液萃取提取目标物和初步净化后经改进的QuEChERS方法进行提取净化,提取液经GC-MS进行检测。结果表明,8种农药在大豆油中的检出限为0.004～0.015 mg/kg;在0.02、0.04、0.1、0.2 mg/kg添加水平的平均回收率分别为99%～113%、80.8%～101.5%、71.9%～91.7%、86.3%～103.6%;相对标准偏差(RSD,n=6)分别为6.1%～13.4%、4.3%～8.5%、3.5%～7.4%、3.4%～6.7%。本方法具有操作便捷、快速等特点,适用于植物油中8种农药残留的快速检测。     

火焰光度检测器-气相色谱法测定食品中3-乙酰基-2,5-二甲基噻吩的含量

目的建立火焰光度检测器-气相色谱法检测食品中3-乙酰基-2,5-二甲基噻吩(3-acetyl-2,5-dimethylthiophene,ADP)的分析方法。方法含油脂食品经甲醇提取后冷冻过滤、不含油脂食品经正己烷提取后离心,以气相色谱仪-火焰光度检测器为检测手段,外标法定量。结果 ADP在0.005～1.000μg/mL浓度范围内二次曲线线性良好,相关系数为0.9999;ADP在不同基质中的检出限均可达到0.015 mg/kg,定量限达到0.05 mg/kg;在不同基质及不同加标浓度下,平均加标回收率为86.3%～108.7%,相对标准偏差(relative standard deviations,RSDs)为4.50%～6.97%(n=6)。结论该方法前处理操作简便、技术难度低,准确度和灵敏度高,抗干扰能力强,适用于定量准确并快速地测定食品中ADP的含量。