Hazardous decomposition products formed under fire conditions - Carbon oxides, nitrogen oxides (NOx), hydrogen chloride gas. /Metformin hydrochloride/
碰撞截面：
123 Ų [M+H]+ [CCS Type: TW, Method: calibrated with polyalanine and drug standards]
计算性质
辛醇/水分配系数(LogP)：
-0.82
重原子数：
10
可旋转键数：
2
环数：
0.0
sp3杂化的碳原子比例：
0.5
拓扑面积：
91.5
氢给体数：
4
氢受体数：
1
ADMET
代谢
Metformin is not metabolized in the liver or GI tract and is not excreted in bile; no metabolites of the drug have been identified in humans.
二甲双胍不会在肝脏或胃肠道代谢，也不会通过胆汁排泄；在人体中没有发现该药物的代谢物。
Metformin is not metabolized in the liver or GI tract and is not excreted in bile; no metabolites of the drug have been identified in humans.
IDENTIFICATION AND USE: Metformin is antihyperglycemic, not hypoglycemic agent. It does not cause insulin release from the pancreas and does not cause hypoglycemia, even in large doses. HUMAN EXPOSURE AND TOXICITY: Metformin is believed to work by inhibiting hepatic glucose production and increasing the sensitivity of peripheral tissue to insulin. It does not stimulate insulin secretion, which explains the absence of hypoglycemia. Metformin also has beneficial effects on the plasma lipid concentrations and promotes weight loss. Accumulation of metformin may occur in patients with renal impairment, and such accumulation rarely can result in lactic acidosis, a serious, potentially fatal metabolic disease. Lactic acidosis constitutes a medical emergency requiring immediate hospitalization and treatment; lactic acidosis is characterized by elevated blood lactate concentrations, decreased blood pH, electrolyte disturbances with an increased anion gap, and an increased lactate/pyruvate ratio. Lactic acidosis also may occur in association with a variety of pathophysiologic conditions, including diabetes mellitus, and whenever substantial tissue hypoperfusion and hypoxemia exist. Approximately 50% of cases of metformin-associated lactic acidosis have been reported to be fatal. No evidence of mutagenicity or chromosomal damage was observed in in vitro test systems, including human lymphocytes assay. ANIMAL STUDIES: No evidence of carcinogenic potential was seen in a 104-week study in male and female rats receiving metformin hydrochloride dosages up to and including 900 mg/kg daily or in a 91-week study in male and female mice receiving metformin hydrochloride at dosages up to and including 1500 mg/kg daily. Cancer preventive effect of metformin (MF) has been studied in mice, rats and hamsters. In the majority of cases metformin treatment leads to inhibition of carcinogenesis. No evidence of impaired fertility was observed in rats following administration of metformin hydrochloride dosages of 600 mg/kg daily. Reproduction studies in rats and rabbits given metformin hydrochloride dosages of 600 mg/kg daily have not revealed teratogenicity. No evidence of mutagenicity or chromosomal damage was observed in vivo in a micronucleus test in mice or in in vitro test systems, including microbial (Ames test) and mammalian (mouse lymphoma) assays. Pretreatment of rat cerebellar granule neurons with metformin greatly enhanced cell viability against glutamate-induced neurotoxicity. In aged male mice fed high-fat diet supplemented with metformin for 6 months, metformin decreased body fat composition and attenuated declines in motor function induced by a high fat diet. Performance in the Morris water maze test of hippocampal based memory function, showed that metformin prevented impairment of spatial reference memory associated with the high fat diet. ECOTOXICITY STUDIES: Adult fathead minnows (Pimephales promelas) were chronically exposed to metformin for 4 wk, at 40 ug/L. Metformin treatment induced significant up-regulation of messenger ribonucleic acid (mRNA) encoding the egg-protein vitellogenin in male fish, an indication of endocrine disruption.
◉ Summary of Use during Lactation:Data from well-conducted studies indicate that metformin levels in milk are low and infants would receive less than 0.5% of their mother's weight-adjusted dosage. Milk metformin levels are relatively constant during maternal metformin use, so timing of breastfeeding with respect to the administration times is of little benefit. Although the dose in milk is low, metformin is sometimes detectable in low levels in the serum of breastfed infants. One sizeable prospective study found no adverse effects in breastfed infants. Metformin is sometimes used as a galactogogue in women with reduced milk supply, but there is no evidence that it is effective. Metformin should be used with caution while nursing newborn and premature infants and those with renal impairment.
◉ Effects in Breastfed Infants:Seven infants aged 5 to 25 months whose mothers were taking metformin (start date and duration not stated) were judged to be healthy with growth and development progressing as expected. Two of the infants also had normal Denver Developmental Screening tests.
Three infants aged 2, 5 and 14 months whose mothers were taking metformin 500 mg twice daily had no detectable adverse effects from metformin.
In 3 breastfed (extent not stated) infants aged 10 to 11 days postpartum whose mothers were taking an average metformin dosage of 9.6 mg/kg (range 7.5 to 12.4 mg/kg) daily, none of the infants had low blood glucose levels. Their mothers reported no adverse reactions in the infants.
Ninety-two mothers of 111 infants were treated with metformin in a mean dosage of 2.2 grams daily (range 1.5 to 2.55 mg daily) throughout pregnancy and postpartum. A 6-month, nonrandomized, prospective trial followed 61 predominantly breastfed and 50 formula-fed infants of these women. No differences in 3- and 6-month outcomes were found by blinded observers between the 2 groups of infants in height, weight, motor-social development or rates of illness.
◉ Effects on Lactation and Breastmilk:In a retrospective study of 250 women who received metformin 500 mg to 2 grams daily in either the immediate- or extended-release formulation for polycystic ovary syndrome, information on breastfeeding was available on 164 women. Of these, 97 (59%) were successful at breastfeeding, 27 (17%) failed, and 40 (27%) made no attempt to breastfeed. Of the 124 who attempted to breastfeed, 78% were successful. Failures were attributed to poor milk production in 4 women, demands of multiple births, infant prematurity, cleft palate and mastitis. Most of the women stopped metformin by the 12th week of pregnancy.
In a follow-up to a placebo-controlled study on metformin use during pregnancy in women with polycystic ovary syndrome, women were asked about the duration and extent of breastfeeding. No difference in breastfeeding in the duration of exclusive or partial breastfeeding was observed between the women who received metformin during pregnancy and those who received placebo.
A small pilot study of women with low milk supply and at least one sign of insulin resistance were randomized to receive metformin (n = 10) or placebo (n = 5). Metformin (Glucophage XR) was given in doses that increased at weekly intervals from 750 mg to 1.5 grams to 2 grams daily. Milk output was determined by weighing their infants before and after feeding plus the weight of any pumped milk. At 2 to 4 weeks of the study, women given placebo had a reduction of 58 mL daily while those who received metformin increased their milk output by 8 mL daily; however this difference was not statistically significant.
The clinical use of doxorubicin, which is a strong antineoplastic agent, is limited due to its cardiotoxic side effects. Metformin is a drug with antihyperglycemic effects, and it has been shown to have a cardioprotective effect on left ventricular function in experimental animal models of myocardial ischemia. The present study investigated the cardioprotective effect of metformin in rats with doxorubicin cardiotoxicity. Wistar albino rats were used in the study. Forty male, 10-week-old Wistar albino rats were randomly divided four groups. The control group rats were intraperitoneally administered saline solution twice a week, four doses in total. The doxorubicin group rats received doxorubicin (4 mg/kg, twice a week, cumulative dose: 16 mg/kg) intraperitoneally. The metformin group rats received metformin (250 mg/kg/day, every day for 14 days) via gavage. The doxorubicin + metformin group rats received doxorubicin and metformin at the same dose. Left ventricular functions were evaluated by using M-mode echocardiography one day after the last dose of doxorubicin. Heart tissue samples were histopathologically examined. Cardiomyocyte apoptosis was detected using in situ terminal deoxynucleotide transferase assay (TUNEL). Serum brain natriuretic peptide and C-type natriuretic peptide levels were measured. Catalase, superoxide dismutase, glutathione peroxidase, and tumor necrosis factor alpha levels were analyzed in the heart tissue. The assumptions of equality of variances and normal distribution were checked for all variables (Shapiro-Wilk test and Q-Q graphics). To identify intergroup differences, one-way variant analysis or the Kruskal-Wallis test was used. A p<0.05 value was accepted as statistically significant. Our results showed that doxorubicin treatment caused significant deterioration in left ventricular functions by echocardiography, histological heart tissue damage, and increase in cardiomyocyte apoptosis. Doxorubicin + metformin group showed protection in left ventricular function, elimination of histopathologic change, and reduced of cardiomyocyte apoptosis. The present study provided evidence that metformin has cardioprotective effects against doxorubicin cardiotoxicity.
The link between inflammation and cancer has been confirmed by the use of anti-inflammatory therapies in cancer prevention and treatment. 5-aminosalicylic acid (5-ASA) was shown to decrease the growth and survival of colorectal cancer (CRC) cells. Studies also revealed that metformin induced apoptosis in several cancer cell lines. We investigated the combinatory effect of 5-ASA and metformin on HCT-116 and Caco-2 CRC cell lines. Apoptotic markers were determined using western blotting. Expression of pro-inflammatory cytokines was determined by RT-PCR. Inflammatory transcription factors and metastatic markers were measured by ELISA. Metformin enhanced CRC cell death induced by 5-ASA through significant increase in oxidative stress and activation of apoptotic machinery. Moreover, metformin enhanced the anti-inflammatory effect of 5-ASA by decreasing the gene expression of IL-1beta, IL-6, COX-2 and TNF-alpha and its receptors; TNF-R1 and TNF-R2. Significant inhibition of activation of NF-kappaB and STAT3 transcription factors, and their downstream targets was also observed. Metformin also enhanced the inhibitory effect of 5-ASA on MMP-2 and MMP-9 enzyme activity, indicating a decrease in metastasis. The current data demonstrate that metformin potentiates the antitumor effect of 5-ASA on CRC cells suggesting their potential use as an adjuvant treatment in CRC.
Previous studies suggest that metformin may exert a protective effect on cisplatin-induced cytotoxicity in cancer cells, and this finding has led to a caution for considering metformin use in the treatment of cancer patients. However, in this paper we provide the first demonstration that metformin synergistically augments cisplatin cytotoxicity in the esophageal squamous cancer cell line, ECA109, under glucose-deprivation conditions, which may be more representative of the microenvironment within solid tumors; this effect is very different from the previously reported cytoprotective effect of metformin against cisplatin in commonly used high glucose incubation medium. The potential mechanisms underlying the synergistic effect of metformin on cisplatin-induced cytotoxicity under glucose-deprivation conditions may include enhancement of metformin-associated cytotoxicity, marked reduction in the cellular ATP levels, deregulation of the AKT and AMPK signaling pathways, and impaired DNA repair function.
Metformin is slowly and incompletely absorbed from the GI tract, mainly from the small intestine; absorption is complete within 6 hours. The absolute oral bioavailability of the drug under fasting conditions is reported to be approximately 50-60% with metformin hydrochloride doses of 0.5-1.5 g; binding of the drug to the intestinal wall may explain the difference between the amount of drug absorbed (as determined by the urinary and fecal excretion of unchanged drug) and the amount bioavailable in some studies. In single-dose studies with metformin hydrochloride conventional tablets doses of 0.5-1.5 g or 0.85-2.55 g, plasma metformin concentrations did not increase in proportion to increasing doses, suggesting an active saturable absorption process. Similarly, in single-dose studies with an extended-release tablet preparation (Glumetza) at doses of 0.5-2.5 g, plasma metformin concentrations did not increase in proportion to increasing doses. At steady state after administration of a metformin hydrochloride extended-release tablet preparation (Glucophage XR), the AUC and peak plasma concentrations were not dose proportional within the range of 0.5-2 g. However, limited data from studies in animals and in human intestinal cell cultures suggest that transepithelial transfer of metformin in the intestine may occur through a passive, nonsaturable mechanism, possibly involving a paracellular route. In several studies with another metformin hydrochloride extended-release tablet preparation (Fortamet) using doses of 1-2.5 g, metformin exposure was dose-related.
Following oral administration of metformin hydrochloride (0.5-1.5 g) as conventional tablets in healthy individuals or in patients with type 2 diabetes mellitus, plasma concentrations decline in a triphasic manner. Following multiple-dose administration of metformin hydrochloride (500 mg twice daily for 7-14 days) as conventional tablets in a limited number of patients with type 2 diabetes mellitus, peak plasma concentrations remained unchanged, but trough drug concentrations were higher than with single-dose administration, suggesting some drug accumulation in a peripheral tissue compartment. No accumulation of metformin appears to occur following repeated oral doses of the drug as extended-release tablets. The principal plasma elimination half-life of metformin averages approximately 6.2 hours; 90% of the drug is cleared within 24 hours in patients with normal renal function. The decline in plasma metformin concentrations is slower after oral than after IV administration of the drug, indicating that elimination is absorption rate-limited. Urinary excretion data and data from whole blood indicate a slower terminal-elimination phase half-life of 8-20 hours (e.g., 17.6 hours)1 suggesting that the erythrocyte mass may be a compartment of distribution.
Metformin is distributed rapidly in animals and humans into peripheral body tissues and fluids, particularly the GI tract; the drug also appears to distribute slowly into erythrocytes and into a deep tissue compartment (probably GI tissues). The highest tissue concentrations of metformin (at least 10 times the plasma concentration) occur in the GI tract (e.g., esophagus, stomach, duodenum, jejunum, ileum), with lower concentrations (twice the plasma concentration) occurring in kidney, liver, and salivary gland tissue. The drug distributes into salivary glands with a half-life of about 9 hours. Metformin concentrations in saliva are tenfold lower than those in plasma and may be responsible for the metallic taste reported in some patients receiving the drug. Any local effect of metformin on glucose absorption in the GI tract may be associated with the relatively high GI concentrations of the drug compared with those in other tissues. It is not known whether metformin crosses the blood-brain barrier or the placenta in humans or if the drug is distributed into human milk; however, in lactating rats, metformin is distributed into breast milk at levels comparable to those in plasma.
Renal clearance is approximately 3.5 times greater than creatinine clearance, indicating that tubular secretion is the principal route of metformin elimination. Following a single 850-mg oral dose of metformin hydrochloride, renal clearance averaged 552, 491, or 412 mL/minute in nondiabetic adults, diabetic adults, or healthy geriatric individuals, respectively. Renal impairment results in increased peak plasma concentrations of metformin, a prolonged time to peak plasma concentration, and a decreased volume of distribution. Renal clearance is decreased in patients with renal impairment (as measured by decreases in creatinine clearance) and, apparently because of reduced renal function with age, in geriatric individuals. In geriatric individuals, decreased renal and plasma clearance of metformin also results in increased plasma concentrations of the drug; volume of distribution remains unaffected.
Ullmann-type C–N coupling reaction catalyzed by CuI/metformin
摘要：
A facile and efficient method for Ullmann-type C-N coupling reaction of amine and aryl halide catalyzed by CuI/metformin in EtOH is described. The advantages of this method are the use of an inexpensive and readily available catalyst and ligand, easy workup, shorter reaction time, improved yields, and the use of green solvent. Furthermore, this procedure is applied successfully for the modification of natural products, such as Vindoline and Tabersonin. (C) 2014 Elsevier Ltd. All rights reserved.
Design, synthesis and evaluation of dihydrotriazine derivatives-bearing 5-aryloxypyrazole moieties as antibacterial agents
作者：Tian-Yi Zhang、Chun-Shi Li、Ming-Yue Cui、Xue-Qian Bai、Jiang-Hui Chen、Ze-Wen Song、Bo Feng、Xue-Kun Liu
DOI：10.1007/s11030-020-10071-9
日期：2021.5
study implied that compound 10d exerted its antibacterial activity through DHFR inhibition. Moreover, significant inhibition of biofilm formation was observed in bacterial cells treated with MIC conc. of 10d as visualized by SEM micrographs. Graphic abstract Twenty-nine target compounds were designed, synthesized and evaluated in terms of their antibacterial and antifungal activities.
Multicomponent Crystal of Metformin and Barbital: Design, Crystal Structure Analysis and Characterization
作者：Linhong Cai、Lan Jiang、Cong Li、Xiaoshu Guan、Li Zhang、Xiangnan Hu
DOI：10.3390/molecules26144377
日期：——
simple approach for the screening of candidate crystal co-formers. The prediction of intermolecular synthons facilitated the successful synthesis of a new multicomponentcrystal of metformin (Met) and barbital (Bar) through an anion exchange reaction and cooling crystallization method. The single crystal X-ray diffraction analysis demonstrated the hydrogen bond-based ureide/ureide and guanidine/ureide
containing chalcone (13a–i), phenoxy acetophenone (14a–b), benzyl benzene (15a–c), naphthoxyl acetophenone (16a–b) and benzyl naphthalene (17a–h) moieties were designed and synthesized. The antibacterial and antifungal activities of these compounds were evaluated against several strains of Gram-positive and Gram-negative bacteria, as well as a single fungus. Compound 17h was found to be the most potent of all
A series of N,N-dimethyl-N1-[3-(substituted phenyl)-1-oxo-2-propenyl]biguanides were synthesized by coupling a solution of metformin in pyridine with different cinnamoyl chloride derivatives in ether for 3 h in addition to synthesis of some five molecules of metformin-mandelates. All the synthesized cinnamoyl metformins and a few metformin-mandelates were characterized by IR, NMR and Mass spectroscopic techniques. All the synthesized compounds were also evaluated for their antioxidant activity by DPPH scavenging method and nitric oxide scavenging method. All the compounds exhibited good antioxidant activity.
Biguanide Iridium(III) Complexes with Potent Antimicrobial Activity
作者：Feng Chen、John Moat、Daniel McFeely、Guy Clarkson、Ian J. Hands-Portman、Jessica P. Furner-Pardoe、Freya Harrison、Christopher G. Dowson、Peter J. Sadler
DOI：10.1021/acs.jmedchem.8b00906
日期：2018.8.23
We have synthesized novel organoiridium(III) antimicrobial complexes containing a chelated biguanide, including the antidiabetic drug metformin. These 16- and 18-electron complexes were characterized by NMR, ESI-MS, elemental analysis, and X-ray crystallography. Several of these complexes exhibit potent activity against Gram-negative bacteria and Gram-positive bacteria (including methicillin-resistant
