以5-Br-PADAP为显色剂计算法测定血清总铁结合力

建立了以5-Br-PADAP为显色剂计算法测定血清总铁结合力(TIBC)的方法,通过测定血清铁和血清未饱和铁(UIBC)含量,以血清铁和血清UIBC含量之和计算血清TIBC含量。该法线性范围0~168μmol/L,平均回收率为100.4%,批内变异系数(CV)和批间变异系数分别为0.031、0.046,与临床检验操作规程推荐的方法比较具有良好的相关性,线性回归方程和相关系数分别为y=0.9978x 1.26,r=0.9745。65例健康男性血清TIBC含量为47.61~76.24μmol/L(x±2s),57例健康女性血清TIBC含量为52.56~77.45μmol/L(x±2s)。以5-Br-PADAP为显色剂计算法测定血清总铁结合力TIBC方法简便、灵敏可靠,适合临床应用。     

三试剂自动分析法测定血清总铁结合力——5-Br-PADAP直接光度法

为建立简便、灵敏的测定血清总铁结合力(TIBC)自动化分析法,在表面活性剂存在下,用2-(5-溴-2-吡啶偶氮)-5-二乙氨基酚(5-Br-PADAP)为显色剂测定血清TIBC。该法线性范围0~180μmol/L,平均回收率为99.71%,批内变异系数(CV)和批间变异系数分别为0.024、0.041,与临床检验操作规程推荐的方法比较具有良好的相关性,线性回归方程和相关系数分别为y=0.994 3x 1.220 6,r=0.996 8。血清TIBC含量测定结果(-x±2s):105例健康男性48.0~76.0μmol/L,98例健康女性血清52.0~76.0μmol/L。可见用5-Br-PADAP三试剂自动化分析法测定血清TIBC方法简便、灵敏可靠,适合临床应用。     

5-Br-PADCAP 直接光度法测定血清未饱和铁结合力

为建立简便、灵敏的双试剂自动化分析法测定血清未饱和铁结合力(UIBC),在表面活性剂存在下,用2-(5-溴-2-吡啶偶氮)-5-[(N,N-二羧基甲基)氨基]苯酚(5-Br-PADCAP)为显色剂测定血清UIBC。结果表明,线性范围0~90μmol/L,平均回收率101.57%,批内变异系数(CV)和批间变异系数分别为0.028、0.046,与日本和光UIBC测定试剂盒比较具有良好的相关性,线性回归方程和相关系数分别为y=1.0133x-0.3356,r=0.9961。108例健康人血清UIBC含量为31.65~50.81μmol/L(±2s)。用5-Br-PADCAP双试剂自动化分析法测定血清UIBC方法简便、灵敏可靠,适合临床应用。     

新的铬天青B直接光度法测定血清总铁结合力

为建立新的铬天青B直接光度法测定血清总铁结合力（TIBC）,在表面活性剂存在下,用铬天青B（CAB）为显色剂测定了血TIBC。结果表明,该法线性范围0～160μmol／L,平均回收率为99．4％,批内变异系数（CV）和批间变异系数分别为0．020、0．035,与临床检验操作规程推荐的方法比较具有良好的相关性,线性回归方程和相关系数分别为y=1．0033x＋0．4510,r=0．9982;60例健康男性血清TIBC含量为46．2～75．8μmol／L（x±2s）,60例健康女性血清TIBC含量为51．8～76．9μmol／L（x±2s）。用新的铬天青B直接光度法测定血清总铁结合力方法简便、灵敏可靠,适合临床应用。     

三试剂自动分析法测定血清总铁结合力：Nitro—PAPS直接光度法

为建立简便、灵敏的三试剂自动化分析法测定血清总铁结合力（TIBC）,在表面活性剂存在下,用2-（5-硝基-2-吡啶偶氮）-5-[N-正丙基-N-（3-磺酸丙基）氨基]苯酚二钠（Nitro—PAPS）为显色剂测定了血清TIBC。结果表明,该法线性范围0～195μmol／L,平均回收率为100．7％,批内变异系数（CV）和批间变异系数分别为0．019、0．032;与临床检验操作规程推荐的方法比较具有良好的相关性,线性回归方程和相关系数分别为Y=1．0021x＋1．2100,r=0．9798;78例健康男性血清TIBC含量（x±2s）为46．8—76．1μmol／L,75例健康女性为52．8—77．6μmol／L。方法简便、灵敏可靠,适合临床应用。     

干法灰化-铬天青S光度法测定血清铝含量

建立了一种快速、灵敏测定血清铝的分光光度方法。血清标本经灰化处理后 ,在表面活性剂CPC存在下 ,用铬天青S (CAS)作显色剂测定血清铝 ,线性范围 0～ 7 4μmol/L ,平均回收率为 1 0 0 6% ,批内变异系数 (CV)和批间变异系数分别为 0 0 2 8和 0 0 3 7,与Al-CAS络合法比较具有良好的相关性 ,y =0 .990 2x -0 0 1 3 0 ,r =0 .9977,P >0 0 5。 42例健康人血清铝含量为 0 92～ 4 1 6μmol/L ( x± 2s)。用本法测定血清铝方法简便、灵敏可靠 ,适合临床应用。     

2-(5-溴-2-吡啶偶氮)-5-[N,N-二羧基甲基]苯酚光度法测定血清铁

为建立方便、灵敏的血清铁测定法 ,以 2 -(5 -溴 -2 -吡啶偶氮 ) -5 -[N ,N -二羧基甲基 ]苯酚 (5 -Br-PADCAP)作显色剂 ,在pH 6 5HAc-NaAc缓冲液中测定血清铁。结果表明 ,该法线性范围 0～ 5 0 μmol/L ,平均回收率为 99 8% ,批内CV和批间CV分别为 0 0 2 2与0 0 3 2 ,与原子吸收分光光度法比较具有良好的相关性 ,y =0 9942x -0 0 5 7,r =0 990 8,P >0 0 5。 96例健康人血清铁含量为 9 42～ 2 9 86μmol·L- 1(x± 2S)。 5 -Br-PADCAP分光光度法测定血清铁方法简便、灵敏可靠 ,适合临床应用     

5-Br-PADAP直接光度法测定发锌

为建立一种简便、快速、灵敏的直接光度法测定发锌,将发样经无机化处理后,以5-Br-PADAP作为显色剂,在表面活性剂存在下直接光度法测定头发锌含量。结果表明,该法线性范围为0～612.0μmol/L,回收率为99.4％～102.4％,批内变异系数(CV)和批间变异系数分别为0.027和0.033。55例健康人头发锌含量为171.8±67.5μg(x±2s)。可见5-Br-PADAP直接光度法测定发锌具有操作简单、快速灵敏、结果可靠的优点,适合临床应用。     

不去蛋白直接光度法测定血清锌

建立了一种在表面面活性剂Brij-35存在下,用2-(5-溴-2-吡啶偶氮)-5-二乙氨基酚(5-Br-PADAP)作显色剂不去蛋白直接光度法测定血清锌的新方法.用该法测定血清锌,显色络合物最大吸收波长为560nm,线性范围0～46.0μmol.L-1,表观摩尔吸光系数为1.08×105L.mol-1cm-1,回收率为97.5%～102.8%,批内变异系数(CV)和批间变异系数分别为2.3%与3.7%.与原子吸收分光光度法比较具有良好的相关性.回归方程为y=1.01x-0.26,r=0.9884,P＞0.05.4例健康人血清锌含量为9.5～24.7μmol.L-1(x-±2S).用该法进行血清锌测定,准确性和重现性均较好,且血清用量少,不必去蛋白,操作步骤简化,具有快速、简便、灵敏可靠等优点,适合临床应用.     

血清铜自动分析法试剂盒的研制与分析: 5-Br-PADAP直接光度法

为研制、评价血清铜 5 -Br -PADAP自动分析法试剂盒 ,在表面活性剂存在下 ,用2 -(5 -溴 -2 -吡啶偶氮 ) -5 -二乙氨基酚 (5 -Br -PADAP)作显色剂 ,双试剂两点终点法测定血清铜。结果表明 ,该法线性范围 0～ 80 μmol L ,平均回收率为 1 0 0 7% ,批内变异系数 (CV)和批间变异系数分别为 0 0 1 5～ 0 0 2 0和 0 0 2 3～ 0 0 3 0 ,与原子吸收分光光度法比较具有良好的相关性 ,y =1 0 0 1x -0 0 93 ,r=0 9948,P >0 0 5。 1 0 7例健康人血清铜含量为 1 6 68± 2 62 μmol·L-1(x± 2S)。可见用本试剂盒双试剂自动化分析法测定血清铜方法简便、灵敏可靠 ,适合临床应用     

二氧化碳和丙烯直接合成甲基丙烯酸的NiPMo/TiO2催化剂的研究

用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%.     

Synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives

Different approaches for the synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives from simple amino acids have been investigated. A library of 33 precursors for the preparation of N-hydroxy pyrazinones was obtained in moderate to good yields.     

Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction

In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments.     

CoFe2O4自形成磁性液体场致结构化对磁化的影响

The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula.     

Highly regioselective Buchwald–Hartwig amination at C-2 of 2,4-dichloropyridine enabling a novel approach to 2,4-bisanilinopyridine (BAPyd) libraries

The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines.     

KMnO4-mediated oxidative CN bond cleavage of tertiary amines: Synthesis of amides and sulfonamides

KMnO₄-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.     

Chemistry of heterocyclic compounds at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, over 50 years (Review)

The review contains a concise historical account and information on the most significant researches undertaken by the staff at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry of Heterocyclic Compounds. Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008.     

A general and convenient synthesis of 4-(tosylmethyl)semicarbazones and their use in amidoalkylation of hydrogen,heteroatom, and carbon nucleophiles

A general synthesis of previously unknown semicarbazone-based α-amidoalkylating reagents, 4-(tosylmethyl)semicarbazones, has been developed. The synthesis involved three-component condensation of semicarbazones of aliphatic or aromatic aldehydes with the same or other aldehydes and p-toluenesulfinic acid. The scope and limitations of this reaction were investigated. The compounds obtained were demonstrated to be an efficient α-(4-semicarbazono)alkylating agents. They were reacted with H- (sodium borohydride), O- (sodium methylate), S- (sodium phenylthiolate), N- (pyrrolidine, sodium succinimide), P- (trialkyl phosphites), and C-nucleophiles (sodium diethyl malonate) to give the corresponding products of the tosyl group substitution, 4-substituted semicarbazones, including analogues of nitrofurazone. Among the prepared compounds tested in vitro for antibacterial and antifungal activity, three nitrofuryl-containing semicarbazones exhibited high biological activities with minimum inhibitory concentration (MIC) values of 8–32 μg/mL.     

Sulfur-directed metal-free and regiospecific methyl C(sp3)–H imidation of thioanisoles

Regiospecific and direct imidation of the methyl C(sp³)–H bond of thioanisoles is realized under mild and metal-free conditions with N-fluorobis(benzenesulfonyl)imide as an oxidant and nitrogen source. Proposed mechanism suggests that thionium ion intermediates and a Pummerer-type reaction are involved. The imidation has advantages such as high step-economy, excellent functionality tolerance, and regiospecificity, giving structurally diverse imidation products.     

Synthesis of novel chiral bidentate hydroxyalkyl-N-heterocyclic carbene ligands and their application in palladium-catalyzed Mizoroki–Heck couplings and asymmetric addition of diethylzinc to benzaldehyde

A small library of new chiral bidentate hydroxyalkyl-imidazolium salts 1 is conveniently synthesized on multi-gram scale from inexpensive and commercially available chiral pool amino acids. The corresponding carbenes, generated by deprotonation of imidazolium salts 1, in combination with palladium(II) chloride were tested in the Mizoroki–Heck coupling reaction. The most significant results in terms of yields and reactivities were achieved with low catalyst loading. The catalytic activities of these imidazolium salts were also investigated in the asymmetric addition of diethylzinc to benzaldehyde. The use of MgO nanoparticles as an additive in conjunction with these ligands played a crucial role in increasing the efficiency of these reactions.