Metabolism of inorganic borates by biological systems is not feasible owing to the excessive energy (523 kJ/mol) required to break the boron-oxygen bond. Inorganic borates, in low concentrations, convert to boric acid at physiological pH in the aqueous layer overlying mucosal surfaces prior to absorption. This is supported by the evidence in both human and animal studies, where more than 90% of the administered dose of borate is excreted as boric acid. There is evidence in both in vitro and in vivo systems that boric acid has an affinity for cis-hydroxyl groups, and this may be the mechanism that explains the biological effects of boric acid. However, this attachment is known to be reversible and concentration dependent, responding to clearance mechanisms.
来源:Hazardous Substances Data Bank (HSDB)
毒理性
致癌性证据
癌症分类:人类非致癌性证据E组
Cancer Classification: Group E Evidence of Non-carcinogenicity for Humans
Boric acid is well absorbed from the gastrointestinal tract, open wounds, and serous cavities but displays limited absorption in intact skin. Following intraperitoneal injection in mice, the peak concentration was reached in about 1.0-1.5 hr in the brain whereas the value was 0.5 hr in other tissues.
Regardless the route of administration, boric acid predominantly undergoes rapid renal excretion of >90% of total administered dose as unchanged form. Small amounts are also excreted into sweat, saliva, and feces. Following administration as ointment, urinary excretion of boric acid accounted for only 1% of the administered dose.
A case report of acute boric acid poisoning following oral ingestion of 21 g of boric acid presents the total body clearance of 0.99 L/h before hemodialysis.
Boric acid is readily absorbed from GI tract, serous cavities, and abraded or inflamed skin. It does not penetrate intact skin. Approximately 50% of given dose is excreted within 24 hr. During chronic administration, plateau in urinary excretion is reached only after 2 wk. ... Large amounts of boric acid are localized in brain, liver, and kidney. ... Intracytoplasmic inclusions in pancreas /have been noted/ in fatal cases. /Boric acid/
Structure Lattice-Dimensionality and Spectroscopic Property Correlations in Novel Binary and Ternary Materials of Group 13 Elements with α-Hydroxycarboxylic Benzilic Acid and Phenanthroline
作者:E. Halevas、A. Hatzidimitriou、M. Bertmer、A. A. Vangelis、A. Antzara、C. Mateescu、A. Salifoglou
DOI:10.1021/cg500638z
日期:2014.8.6
To probe and understand the structural and coordinative flexibility of Group 13 ions with α-hydroxycarboxylic acids, leading to crystalline inorganic–organic hybrid materials with distinct lattice architecture, dimensionality, and spectroscopic properties, the systematic synthesis and physicochemical properties of binary and ternary B(III), Al(III), Ga(III), In(III), and Tl(I)-benzilic acid-(phenanthroline)
为了探查和理解第13族离子与α-羟基羧酸的结构和配位灵活性,从而导致具有独特的晶格结构,尺寸和光谱性质的结晶无机-有机杂化材料,对二元和三元B(系统地合成和理化性质)进行了研究。 III),Al(III),Ga(III),In(III)和Tl(I)-苯甲酸-(菲咯啉)体系在水-醇混合物中进行了研究。第13组离子与苯甲酸和菲咯啉(phen)的化学计量反应提供了新材料[B(C 14 H 10 O 3)2 ](C 3 H 5 N 2)·H 2 O(1),[Al(C 14 H 11 O 3)3 ]·0.5C 2 H 5 OH·4.5H 2 O(2),[Ga(C 14 H 11 O 3)3 ]·CH 3 OH·3H 2 O (3),[In(C 14 H 11 O 3)4 ]·C 3 H 5 N 2 ·C 2 H 5 OH·H 2 O(4),[Tl(C 14 H 11O 3)] n(5),[Tl 2(C
Virtues of Volatility: A Facile Transesterification Approach to Boronic Acids
作者:Stefan P. A. Hinkes、Christian D. P. Klein
DOI:10.1021/acs.orglett.9b00584
日期:2019.5.3
Boronic acids are an increasingly important compound class for many applications, including C–C bond formation reactions, medicinal chemistry, and diagnostics. The deprotection of boronic ester intermediates is frequently a problematic and inefficient step in boronic acid syntheses. We describe an approach that highly facilitates this transformation by leveraging the volatility of methylboronic acid and
Chloramphenicol-borate/boronate complex for controlling infections by chloramphenicol-resistant bacteria
作者:Prabuddha Bhattacharya、Monisha Singha、Kalyan Senapati、Suman Saha、Sudipa Mandal、Santi M. Mandal、Ananta K. Ghosh、Amit Basak
DOI:10.1039/c8ra02227e
日期:——
rationalized by moleculardockingstudies. The latter revealed that the probable reason for the enhanced antibacterial activity may be attributed to the change in the binding site of chloramphenicol-borate/boronate with chloramphenicol acetyltransferase (CAT) with respect to chloramphenicol itself. Hemolytic and genotoxic studies established the reduced toxicity of these synthetic derivatives with respect
Reactions of aminoboron compounds with palladium and platinum complexes
作者:Christopher M Vogels、Heather L Wellwood、Kumar Biradha、Michael J Zaworotko、Stephen A Westcott
DOI:10.1139/v99-106
日期:1999.7.1
287(5) A, β = 99.042(9)°, Z = 2, with space group P21/c. Monoalkene complexes PtCl2(COE)(APBA) (8) and PtCl2(COE)(APBpin) (9) were generated from the addition of APBA and APBpin, respectively, to [PtCl2(COE)]2. Reactions of 2-NMe2CH2C6H4B(OH)2 (10) with palladiumcomplex [PdCl2(COE)]2 proceed via selective BC bond cleavage to give the cyclopalladated dimer [PdCl(2-NMe2CH2C6H4)]2 as the major amine-containing
[DE] VERFAHREN ZUR HERSTELLUNG VON QUARTÄREN AMMONIUMVERBINDUNGEN BEI UMGEBUNGSDRUCK<br/>[EN] METHOD FOR THE PRODUCTION OF QUARTERNARY AMMONIA COMPOUNDS AT ATMOSPHERIC PRESSURE<br/>[FR] PROCEDE DE PRODUCTION DE COMPOSES D'AMMONIUM QUATERNAIRE A LA PRESSION AMBIANTE
申请人:BASF AG
公开号:WO2006018249A1
公开(公告)日:2006-02-23
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung einer quartären Ammoniumverbindung, bei dem man eine Aminverbindung, die wenigstens ein sp3-hybridi siertes Stickstoffatom enthält, bei Umgebungsdruck mit einem Dialkylsulfat unter Einsatz beider Alkylgruppen des Dialkylsulfats umsetzt und die so erhaltene quartäre Ammoniumverbindung mit Sulfatanionen gegebenenfalls einem Anionenaustausch unterzieht.