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建立利用阀切换技术,离子排斥.抑制电导检测器测定水产品中硼酸盐的离子色谱方法.。样品经过简单的除蛋白前处理,即可进样分析采用ICS-1600离子色谱仪(配十通阀),IonPacICE.Borate离子排斥柱分离,利用阀切换技术,lonPacTBC-1硼酸盐富集柱在线捕获待测成分的同时去除基体干扰,而后进行二次分离、2.5mmol/LMSA+60mmol/LMannitol作为淋洗液,流速1.0mL/min,进样量100uL,抑制电导检测。在上述色谱条件下,硼酸的质量浓度在0.1--5.0ug/mL时与色谱峰面积(A)之间的线性关系良好,检限(S/N=3)为0.02ug/mL。将本方法应用于水产品中硼酸盐的检测,加标回收率为86.5%~93.0%。,该方法在线去除基体干扰,简便、快速、准确,可用于实际样品的测定. 相似文献
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建立了反相液相色谱法测定鼠肝组织儿茶酚氧位甲基转移酶(COMT)活性的方法。以3,4-二羟基苯甲酸为底物,测定产物4-羟基-3-甲氧基苯甲酸的生成量计算酶活。色谱柱AgilentZORBAXEclipseXDB—C18(150×4.6mm,5iμmd),流动相为甲醇/0.7%乙酸水溶液(23/77,v/v),流速1.0mL/min,检测波长254nm,柱温25%。4-羟基-3-甲氧基苯甲酸的线性范围0.5~20μg/mL,回收率94—98%,RSD小于5%,检测限0.1μg/mL(S/N=3)。结果表明,该方法简便、快速、重复性好,可应用于鼠肝组织中COMT活性的测定。 相似文献
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GC-MS法测定尿中γ-羟基丁酸 总被引:1,自引:0,他引:1
γ-羟基丁酸(GHB)是娱乐场所滥用的麻醉药。本文用气相色谱-质谱法(GC-MS)测定尿中GHB。尿样酸化后于80℃经20min GHB转化为丁内酯(GBL),用二氯甲烷提取,气相色谱-质谱-选择离子检测模式测定,正己酸为内标。检测离子(GBL为m/z86、56、42、28,内标为m/z87、73、60、41,定量离分别为m/z86和87。方法检出限0.08μg/mL(S/N=3)。尿中加标10μg/mL,6次测定的相对标准偏差为2.5%,回收率57.7%。线性范围0~50μg/mL,相关系数(r^2)为0.9996。用该方法分析20个尿样,GHB浓度都低于1μg/mL。该方法灵敏度高,简单可靠,适用于法医和临床检验。 相似文献
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采用高效液相色谱结合库仑阵列多电极检测器体系(HPLC—ECD)建立了一套操作简便、高效、快速测定多巴胺(DA)、3,4-二羟基苯乙酸(DOPAC)、高香草酸(HVA)、5-羟色胺(5-HT)以及5-羟吲哚乙酸(5-HIAA)的方法,并探究了检测的灵敏性,浓度和响应因子之间的线性关系,系统的稳定性等。DA、DOPAC、HVA、5-HT及5-HIAA的相关系数分别为0.9964、0.9999、1、0.9989、0.9999;HVA和5-HIAA的检测限都低于0.5ng/mL,DA、DOPAC及5-HT的检测限均低于0.1ng/mL,各种物质的方法回收率为85.6%-107.4%。 相似文献
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顶空固相微萃取-气相色谱-质谱法分析白鲢鱼中的挥发性成分 总被引:8,自引:0,他引:8
以我国重要食用的淡水鱼之一,白鲢鱼为原料,采用涂有聚二甲基硅氧烷-二乙烯苯(PDMS-DVB)涂层的固相微萃取头萃取挥发性成分,以鱼肉气味成分中含量比较多的物质(己醛、己醇、庚醛、庚醇、辛醛、1-辛烯-3-醇、壬醛等)为参照对象,比较了不同涂层的萃取头、萃取时间、萃取温度、离子强度、初始状态下不分流时间的长短、解吸时间、程序升温速率等因素对固相微萃取的萃取效率以及气相色谱-质谱联用仪分析效率的影响,建立了顶空固相微萃取技术与气相色谱-质谱联用仪分析鉴定鱼肉中的气味成分的方法。结果表明:固相微萃取技术有效地吸附了鱼肉中的挥发性成分,经NIST质谱数据库检索和文献对照,共确定27种成分,并且萃取时不会造成环境污染,分析简单、快速、经济。 相似文献
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为了克服碳素墨汁、磷化剂等传统吸光涂料吸光率低、污染环境的缺点,作者研制了一种激光热处理用新型的吸光涂料,并将该涂料与碳素墨汁进行了比较研究,结果表明,这种飞机色涂料具有手感细腻、与金属基体结合牢固、干燥快、无毒、无刺激性气味、环境友好、易清除等优点,且对10.6μm波长的CO_2激光的吸收率达85%以上,而碳素墨汁的吸光率只有30%,在相同工艺条件下,涂有新型涂料试样激光淬火后的硬化区面积和硬化层深度分别为3.44mm~2和1.05mm,而碳素墨汁分别为1.01mm~2和0.32mm;涂有新型涂料试样激光淬火后表面洛氏硬度平均为HRC57.6,而碳素墨汁平均为HRC38.6;涂有新型涂料的试样无论聚集法还是宽带法激光淬火后,其表层压应力均大于碳素墨汁,且涂有新型涂料的试样表层的最大压应力为-429MPa。 相似文献
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Active heating garments will be a promising product for improving life quality of rheumatisants and old people in the future. This paper presented an improved fabrication method of flexible heating fabrics (FHFs) which were developed by weaving intermittently silver filaments (SFs) or coated silver yarns (CSYs) into plain fabrics, this method can control more easily density of conductive filaments and rated power of FHFs in terms of requirements. Resistance thermostability and utmost load current of several kinds of conductive materials were utilized to determine an appropriate conductive material of FHFs. Subsequently, performances of FHF with SFs were characterized by a temperature controlling and power measuring device that was developed in our laboratory. Experimental results show SF can load over 0.3 A current, but the CSY and coated silver knitted fabric (CSKF) can load less than 0.1 A current. However, resistance variation ratios (RVRs) of SF are less than etc. 1.66%, but the RVRs of CSY and CSKF exceed 10% and 20%, when environment temperature increases from room temperature to 80 and 100 °C. Furthermore, strong positive linear correlations are between rated power and utmost ascending temperature of FHFs and between power consumption and presetting equilibrium temperatures of FHFs. In general, measurement data and analysis results can provide help for the design and prediction of physical properties of FHFs. 相似文献
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皮肤-纺织品的摩擦特性试验研究 总被引:1,自引:0,他引:1
为了定量研究纺织品与人体皮肤之间的摩擦特性,采用微观摩擦试验机对4种织物与20位男女手臂前臂皮肤之间的摩擦因数进行测试。结果表明:皮肤-织物的平均摩擦因数在0.30~0.50之间,其中男性皮肤-织物的平均摩擦因数在0.30~0.36之间,女性皮肤-织物的平均摩擦因数在0.40~0.50之间。织物表面特征,如表面形状、纹理特点、组织结构、平整度、致密度和弹性等,以及纤维本身的表面特征,是织物表面摩擦特性存在差异的根本原因。4种织物的平均摩擦因数由高到低分别为全毛绒面呢、羊皮、真丝绸和本色平纹棉布,其中丝绸和平纹棉布的平均摩擦因数比较接近;在与不同纺织品摩擦时,女性皮肤-织物的平均摩擦因数普遍比男性高。 相似文献
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Babur Ozcelik Fehmi Erzincanli 《The International Journal of Advanced Manufacturing Technology》2005,25(5-6):527-532
The handling process of a single ply of cotton woven fabrics from a stack in the textile industry is done by workers. Cost-effective automatic handling of the fabrics is becoming an increasingly important issue to reduce the unit cost of the final product .In this study, transporting speeds in the horizontal direction of the woven fabrics were investigated using a non-contact end-effector. A Cartesian robot, which has an x and z axis, was used for handling the cotton woven fabrics. The movement process of a single woven fabric ply from a stack was experimentally shown to find out percentage of success rate of the system. Although the experiments were restricted with small square fabric plies of 100 mm×100 mm sizes, this process could also be applied for products with different shapes. 相似文献
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This paper presents electron-microscopic observations on biopsies of the olfactory mucosae of several classes of patients with smell disorders: 1) patients with loss of smell function following head injury (post-traumatic anosmics or hyposmics); 2) patients with loss of smell function following severe head colds and/or sinus infections (post-viral olfactory dysfunction, or PVOD); and 3) patients that have lacked smell function since birth (congenital anosmics). Of these, the traumatic anosmics' olfactory epithelia were quite disorganized; the orderly arrangement of supporting cells, ciliated olfactory receptor neurons, microvillar cells, and basal cells was disrupted. Although many somata of ciliated olfactory receptors were present, few of their dendrites reached the epithelial surface. The few olfactory vesicles present usually lacked olfactory cilia. The post-viral anosmics, too, had a greatly reduced number of intact ciliated olfactory receptor neurons, and most of those present were aciliate. The post-viral hyposmics had a larger population of intact, ciliated olfactory receptor cells. In the seven cases of congenital anosmia studied, no biopsies of olfactory epithelium were obtained, indicating the olfactory epithelium is either absent--or greatly reduced in area--in these individuals. 相似文献