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1.
建立了高效液相色谱法检测鳗鱼中恩诺沙星、环丙沙星、诺氟沙星等合成抗菌剂残留的方法。样品以乙腈为提取剂,经脱脂、净化、浓缩,用流动相溶解。用高效液相色谱荧光检测器测定恩诺沙星、环丙沙星、诺氟沙星。各标准曲线线性范围0．05—1．20μg／ml,线性相关系数r=0．9911—0．9943,实验回收率为55．0％～85．9％,RSD在5．58％～7．38％（n=5）,检坝4低限分别为1μg／kg,2μg／kg,2μg／kg。 相似文献
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对饲料中硝基呋喃类药物呋喃唑酮、呋喃它酮、呋喃妥因和呋喃西林的超高效液相色谱检测方法进行了研究。采用0．1％甲酸水-乙腈超声提取样品中的待测物,经MCX固相萃取小柱净化后用超高效液相色谱法测定,检测波长为365nm。呋喃唑酮、呋喃它酮、呋喃西林、呋喃妥因在0．1～25mg／L均与对应峰面积呈良好线性关系。对饲料进行硝基呋喃类药物的添加回收实验．添加质量浓度为0．25mg／kg、5mg／kg和100mg／kg时,回收率在79．6％-85．5％之间,变异系数在3．9％～5．2％,方法检出限为0．25mg／kg。结果表明．该法操作简便、灵敏、准确,适用于饲料中硝基呋喃类药物含量的测定。 相似文献
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高效液相色谱法同时测定美白类化妆品中熊果苷和氢醌的含量 总被引：1，自引：0，他引：1
探讨了高效液相色谱法同时测定关白化妆品中熊果苷和氢醌含量的方法,先对样品进行预处理,处理液为氯仿-饱和氯化钠溶液（体积比2：1）,再选用ApolloC18柱,以甲醇-磷酸缓冲液-冰醋酸（体积比25475：1）混合液为流动相,紫外检测,波长为254nm。实验结果表明,该方法在0．01～0.2g/L时具有良好的线性;平均回收率范围为97％～98．5％;熊果苷的检出限为21μg／kg,氢醌的检出限24μg／kg。 相似文献
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建立固相萃取与UPLC—MS／MS检测食品中黄曲霉毒素M1和黄曲霉毒素B1的方法。样品经乙腈提取和SPE小柱萃取净化,提取液经氮气吹干后,用50％甲醇水溶液定容。超高效液相色谱一串联质谱（UPLC—MS／MS）测定,采用电喷雾正离子（ESI＋）模式电离,多反应监测（MRM）模式检测。流动相为0．1％甲酸水溶液和甲醇,流速0．4ml／min,使用ZORBAX Eclipse XDB—C18色谱柱（100mm×3．0mm×1．8μm）为分析柱。黄曲霉毒素AFM1在0．1～50μg／kg范围内线性关系良好、黄曲霉毒素AFB1在0．1～10ug／kg范围内线性关系良好,相关系数均大于0．999;回收率在83．75％～97．8％之间;检出限AFMl为0．05μg／kg、AFBl0．02μg／kg。该法具有分析速度快,检测准确、灵敏度和回收率高等优点,适合食品中黄曲霉毒素M1、B1含量的检测。 相似文献
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建立了水中苯酚、邻苯二酚、间苯二酚、对苯二酚的高效液相色谱-荧光分析方法。样品过0．45μm滤膜后直接进样,以甲醇-水（体积比30：70）为流动相经反相色谱柱分离后．采用荧光检测器检测。通过时间分组改变检测器的激发和发射波长,从而实现同时检测苯酚、邻苯二酚、间苯二酚、对苯二酚。外标法定量。空白样品及其添加实验结果表明．特征激发和发射波长基线稳定,无基质干扰,结合保留时间可实现准确的定性定量。苯酚、邻苯二酚、间苯二酚的方法检出限为5μg／L（S／N=3）,对苯二酚的方法检出限为10μg／L（S／N=3）。空白样本添加水平在10-50μg／L时,平均回收率为83．5％-93．6％,相对偏差（n=6）为4．3％～7．3％。 相似文献
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武夷岩茶营养成分分析 总被引：1，自引：0，他引：1
对3种武夷岩茶和1种绿茶的18项主要营养成分进行了分析,结果为总氮：28-37mg／g;游离氨基酸：42～50mg／g;总糖：420-498mg／g;还原糖：232-298mg／g;茶多糖：182～246mg／g;茶多酚：92～158mg／g;茶咖啡碱：17～48mg／g;类脂类：19-34mg／g;钙：3．6～4．6mg／gi;总磷：2．2～3．7mg／g;镁：1．7～2．2mg／g;锰：0．45～1．24mg／g;铁：0．19～0．66mg／g;锌：30～60μg／g;铜：14～20μg／g;镍：痕量,硒：12～19μg／g;Vc：0．46～0．5mg／g和1．4～2．0mg／g（鲜茶叶）。 相似文献
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以乙腈-甲醇-0．05mol／L磷酸二氢钾溶液（10：20：70）（用磷酸调节pH值为4．0）为流动相．采用迪马钻石C18（250mm×4．6mm，5μm）色谱柱及紫外检测器，建立了甲钴胺注射液中甲钴胺含量的反相高效液相色谱检测方法．柱温：40℃：检测波长为264nm；流速：1．0mL／min．本方法测定的日内精密度为0．59％，日间精密度为0．67％，回收率为99．7％～100．5％，在160～240μg／mL范围内线性关系满足要求（r=-0．9999）；结果表明方法准确、操作简单、专属性强，可用于定量测定甲钴胺注射液含量． 相似文献
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优化测定乳制品中三聚氰胺含量的高效液相色谱方法。色谱条件：ODS—SPe18柱,250mm×4．6mm（i．d．）,5μm;流动相：A为离子对缓冲液（2．02g庚烷磺酸钠和2．10g柠檬酸,加入约950mL水溶解,调节pH值至3．0后,定容至1L）,B为乙腈,配制比例为85％A＋15％B;1．0mL／min;柱温：35℃;波长：242nm;选样量：20灿。结果表明：三聚氰胺标准曲线为Y=-5．582＋42．55x,相关系数R=0．9997,在1．0-50．0μg／mL范围内线性关系良好．样品三个浓度水平的加标回收率在90．1—105．9％之间,相对标准偏差为2．04-5．26％。 相似文献
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建立了牛肉和猪肉中3种有机磷类农药基质固相分散一高效液相色谱分析方法。方法：样品经基质固相分散装柱,乙腈一7．k．（20：80,v／v）洗脱净化,浓缩后c,。分离分析,高效液相色谱紫外检测。结果：检测条件下,3种农药线性良好,线I}生相关系数大于0．9959,对牛肉和猪肉加标1．0ug/kg、5．0．ee＇kg和10．0ug/kg三水平,平均回收率在82．2％～100．9％,变异系数小于7．8％,方法的最低检测限0．03～0．08ug/kg。结论：该方法可以满足实际样品的分析和食品安全控制。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Rajesh Kanoi 《海外英语》2007,(1):52
Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer. 相似文献
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正A One day a pig went to the stable(马棚)to see his good friend,an oldhorse,and was going to stay there forthenight.Night came and it was time forsleep.The pig went into the straw heap(稻草堆)and lay comfortably.A longtime passed,but the horse was stillstanding there and did not move.Thepig asked the horse why he did not go tosleep."Standing like this is the begin-ning ofsleeping,"answered the horse. 相似文献
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《今日中学生》2014,(9)
正1.Any fool can count the seeds in an apple.Only God can count all the apples in one seed.2.Happy families are all alike;every unhappy family is unhappy in its own way.3.Memories are the key not to the past,but to the future.4.Sometimes in the dark you see what you want to see.5.There is a great difference between 相似文献
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《重庆大学学报(英文版)》2014,(2)
正Scope and Policy The Journal of Chongqing University-English Edition(JCQU-E)is a peerreviewed journal publishing research articles in multiple disciplines of science and technology,covering civil and environmental engineering,chemical engineering,biotechnology,mechanical and electrical engineering,computer and data processing,mining,metallurgy,materials science,and interdisciplines thereof. 相似文献