Competitive Deprotonation and Superoxide [O<sub>2</sub><sup>-•</sup>] Radical-Anion Adduct Formation Reactions of Carboxamides under Negative-Ion Atmospheric-Pressure Helium-Plasma Ionization (HePI) Conditions
作者:Isra Hassan、Spencer Pinto、Carl Weisbecker、Athula B. Attygalle
DOI:10.1007/s13361-015-1296-6
日期:2016.3.1
deprotonation under negative-ion-generating mass spectrometric conditions. Herein, we report that N-H bearing carboxamides with acidities lower than that of the hydroperoxyl radical (HO-O(•)) preferentially form superoxide radical-anion (O2(-•)) adducts, rather than deprotonate, when they are exposed to the glow discharge of a helium-plasma ionization source. For example, the spectra of N-alkylacetamides show
已知具有NH官能团的羧酰胺在产生负离子的质谱条件下经历去质子化。在本文中,我们报告说,酸度低于氢过氧自由基(HO-O(•))的NH羧酰胺优先暴露于过氧化氢自由基阴离子(O2(-•))加合物中,而不是去质子化。氦等离子体电离源的辉光放电。例如,N-烷基乙酰胺的光谱显示了超氧自由基阴离子(O2(-•))加合物的峰。相反,更酸性的酰胺,例如N-烷基三氟乙酰胺,优先在相似的实验条件下进行去质子化。碰撞激活后,N-烷基乙酰胺的O2(-•)加合物失去中性酰胺或氢过氧自由基(HO-O(•))生成超氧化物自由基阴离子(m / z 32)或去质子化酰胺[m / z( M-H)(-)]。对于有些酸性的羧酰胺,这两个实体之间的结合较弱。因此,在最轻微的碰撞活化下,加合物解离以排出超氧阴离子。超氧化物加合物的形成结果可用于结构确定,因为没有NH官能团的羧酰胺在HePI条件下既不发生去质子化反应,也不经历加合物的形成。
[EN] RADIONUCLIDE-LHRH CONJUGATES FOR DIAGNOSIS OF REPRODUCTIVE CANCERS<br/>[FR] CONJUGUÉS RADIONUCLÉIDES-LHRH SERVANT AU DIAGNOSTIC DES CANCERS DE LA REPRODUCTION
申请人:EASTERN KENTUCKY UNIV
公开号:WO2021146373A1
公开(公告)日:2021-07-22
The present disclosure concerns luteinizing hormone receptor hormone (LHRH) compositions that can selectively bind to an LHRH receptor. Through the incorporation of radionuclides in the LHRH compositions, selective radiolabeling is made possible, allowing for identification of cells over-expressing the LHRH receptor, which is often a facet of an abnormally growing cell or a tumorigenic cell. The LHRH compositions can therefore provide for improved detection and monitoring of cancers associated with or caused by LHRH receptor over-expression.
Regiospecific Synthesis of Mono-Or Diacetylated Polyethylenepol Yamine Derivatives
作者:Gabriela Kuswik-Rabiega、Fred W. Bruenger、Scott C. Miller
DOI:10.1080/00397919208019313
日期:1992.5
Abstract Acetylated polyethylenepolyamines CH3CONHCH2(CH2-NH-CH2)CH2NH2 (n=1,2;) were synthesized using α-D-pentaacetyl-glucose as an acetylating agent.
PESTICIDAL COMPOSTION COMPRISING AN AMIDOAMINE ALKOXYLATE AS ADJUVANT
申请人:Huntsman Petrochemical LLC
公开号:EP2235134B1
公开(公告)日:2018-07-04
Polycationic sterol derivatives as transfection agents
申请人:Miller D. Andrew
公开号:US20080075763A1
公开(公告)日:2008-03-27
A method for treating genetic disorders or conditions or diseases in patients in need of such treatments. The method includes administering an effective amount of a compound comprising a cholesterol group or derivative thereof having linked thereto a head group. The head group is more positive than the heat group of DC-Chol. The heat group may be a straight chain polymeric group having two or more amine groups separated by an ethylene group.