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HDI's molecular structure is a special saturated straight chain and it has highly unsaturated double bonds.It has such very lively and chemical properties that can be used to form polyurea with water. And it also reacts with polyurethane to form polyol, reacts with amine to biuret.
己二异氰酸酯分子具有特殊的直链饱和结构和含有高度不饱和双键的异氰酸酯基团,化学性质非常活泼,能够与水生成聚二脲,与多元醇反应生成聚胺酯,与胺反应生成缩二脲。
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Methods: Glipizide gliclazide glyburide glimepiride gliquidone repaglinide nateglinide pioglitazone rosiglitazone metformin phenformin and tolbutamide added in the blank ground samples were extracted with 80% methanol and were separated from an ACQUITY UPLC DBH C18 column with a gradient mobile phase of acetonitrile - 0.2 % formic acid water solution. A tandem quadrupole mass spectrometer equipped with electrospray ionization source was used in positive ion mode multiple reaction monitoring was performed to quantify above mentioned compounds.
被添加在中成药制剂及其包装物中的二甲双胍、苯乙双胍、罗格列酮、吡格列酮、格列吡嗫娶瑞格列奈、甲苯磺丁脲、格列齐特、格列苯脲、那格列奈、格列美脲、格列喹酮等西药成分用80%甲醇提取,以乙腈- 0.2%甲酸水溶液为流动相梯度洗脱,在ACQUITY UPLC DBH C18色谱柱上分离,串联四级杆质谱检测,MRM方式采集并定量。
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Results The highest drug use frequency was biguanide. There was 50.9% in the oral antidiabetic drug combination. Leading the first 3 places on the list of drug combination were sulfonylureas in combination with biguanide, sulfonylureas in combination with α-Glycosidace inhibitor, biguanide in combination with α-Glycosidace inhibitor, while there was 16.1% in 3 kinds combination. When oral antidiabetic drugs were combined with other drugs, combination with antihypertensives drugs led the fist, while with antihypertensives drugs led the second.
结果 二甲双胍使用频率最高,口服降糖药联合用药的比例高达50.9%,居前3位的依次是磺脲类+双胍类、磺脲类+α-葡萄糖苷酶抑制剂和双胍类+α-葡萄糖苷酶抑制剂,而3种以上口服降糖药联合用药的比例也达16.1%;口服降糖药与其他药物联合使用情况看,配合使用抗高血压药的频率最高,其次是降脂药。
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The interference of the fat can be effectively eliminated by double reagent biurea reaction without need to carry on manual determina-tion of fat,Thus the working efficiency is greatly enhanced.
双试剂双缩脲法能有效地消除脂肪的干扰,无需另进行手工除脂测定,大大地提高工作效率。
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Our company supply raw materials and related intermediates as follows: Second dibutyryl cAMP calcium, voriconazole, terbinafine, vecuronium amines, cAMP, thiamphenicol, a chlorophenol hydrochloride esters, card network sodium phosphate tilmicosin, foscarnet, lornoxicam, Tilmicosin, Cephalosporium aspirin acid, ceftiofur hydrochloride, ceftiofur sodium, Ozagrel, ondansetron hydrochloride ketones, hydroxyurea, ticarcillin sodium, telmisartan, esmolol hydrochloride, hydrochloric acid Daguan Nikkomycin, adefovir dipivoxil, buflomedil hydrochloride, granisetron hydrochloride, warfarin sodium,-methyl gabexate acid, nicergoline, pantoprazole sodium,·, tegafur, cefepime hydrochloride, vecuronium bromide, hydrochloric acid meclofenoxate, sertraline hydrochloride, Cefonicid amine salt, aztreonam, ticarcillin, cefdinir, cefodizime sodium, sodium ferulate, colloidal pectin secretion, 2,3 - cyclopentene and pyridine, Piperacillin acid, cefetamet US-acid, hydrochloride Cefmenoxime ,3-TZ, 2 - deoxy-D-glucose, two-amidine urea benzene, sodium Cefonicid, Cefonicid intermediates, ester Cefamandole sodium, Cefalotin acid, intermediates cefpirome, cefepime sulphate, cefepime intermediate nucleus of cefepime, cefpirome nucleus, Cefamandole sodium, ceftriaxone new active ester, oxaliplatin, cyclophosphamide vary gland amines, polyene match him.
我公司供应的原料药及相关中间体为:二丁酰环磷腺苷钙、伏立康唑、盐酸特比萘芬、维库溴胺、环磷腺苷、甲砜霉素、盐酸甲氯酚酯、卡络磺钠、磷酸替米考星、膦甲酸钠、氯诺昔康、替米考星、头孢匹胺酸、头孢噻呋盐酸盐、头孢噻呋钠、奥扎格雷、盐酸恩丹西酮、羟基脲、替卡西林钠、替米沙坦、盐酸艾司洛尔、盐酸大观霉素、阿德福韦酯、盐酸丁咯地尔、盐酸格拉司琼、华法林钠、甲磺酸加贝酯、尼麦角林、泮托拉唑钠、普拉洛芬、替加氟、盐酸头孢吡肟、维库溴铵、盐酸甲氯芬酯、盐酸舍曲林、头孢尼西胺盐、氨曲南、替卡西林、头孢地尼、头孢地嗪钠、阿魏酸钠、胶体果胶泌、2,3-环戊烯并吡啶、哌拉西林酸、头孢他美酸、头孢甲肟盐酸盐、3-TZ、2-脱氧-D-葡萄糖、双脒苯脲、头孢尼西钠、头孢尼西中间体、头孢孟多酯钠、头孢噻吩酸、头孢匹罗中间体、头孢吡肟硫酸盐、头孢吡肟中间体、头孢吡肟母核、头孢匹罗母核、头孢孟多钠、头孢曲松新型活性酯、奥沙利铂、异环磷腺胺,多烯他赛。
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The complexation behavior of these compounds with linear or aromatic dicarboxylate was investigated by the means of absorption, emission spectra,〓H-NMR and molecular dynamics.
结果显示,二羧酸盐阴离子与双链萘基脲/硫脲哌嗪化合物发生络合形成新的物种导致双链萘基脲/硫脲哌嗪化合物的吸收和荧光光谱行为的变化。
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Double chain naphthyurea/thiourea piperazine derivatives could act as a fluorescent chemosensor not for aromatic dicarboxylate but for linear dicarboxylate especially for pimelate anion.
双链萘脲基或硫脲基哌嗪化合物与直链二羧酸盐络合具有较高的稳定常数和1∶1的化学计量比,两者通过六个氢键形成双点结合的络合物。
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It is found that when the molar ratio of sulphoxide,pyridine and acetyl bromide is 1∶0.6∶0.4,the catalytic effect on the ring-enlargment is the best,and the yield and purity of the final product can reach 76% and 97% respectively at a pH of 1.8 in toluene under refluxing for about 3.5h.
通过正交实验可得出以下结论:当N,N′-双脲-亚砜为2.5∶1,乙酰溴-亚砜为0.4∶1,吡啶-乙酰溴为1.5∶1,回流时间为3.5h,酸化pH值为1.8时,扩环反应结果最好,总收率可达76%,纯度97%以上。
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Penicillin G sulphoxide is esterified by N,N′-bistrimethylsilyl urea under the temperature 55℃ with a molar ratio 2.5∶1 between BSU and sulphoxide,and the ester obtained is ring-enlarged in the toluene under refluxing with the exist of catalyst-pyridine acetyl bromide.
摘 要 本文在制得青霉素G亚砜的基础上,完成了重排酸的扩环反应,重点探讨了扩环反应的最优化条件。青霉素G亚砜与N,N′-双脲在55℃下反应,得到亚砜的酯化物。
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The 1-propanol/biuretium flour protein fractionation procedure based on the differential solubility of wheat flour protein in different aqueous solutions of 1-propanol yields three protein fractions, one monomeric in nature and two polymeric fractions corresponding to soluble glutenin, insoluble glutenin. Quantitative of the fraction was made with improved biuret reaction.
丙醇—双缩脲改良测定法用不同浓度的丙醇溶液将小麦面粉蛋白质分离为功能截然不同的单体蛋白、可溶性谷蛋白和不可溶性谷蛋白三部分,然后通过改良双缩脲测定法对不同组分进行定量分析。
- 更多网络解释与双脲相关的网络解释 [注:此内容来源于网络,仅供参考]
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biuret test:双脲试验
\\"双脲反应\\",\\"biuret reaction\\" | \\"双脲试验\\",\\"biuret test\\" | \\"二价体\\",\\"bivalent\\"
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biuret test:双(缩)脲试验
双(缩)脲反应 biuret reaction | 双(缩)脲试验 biuret test | 二价 bivalence
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biuret:双缩脲
2.碱性苦味酸(Baljet)试剂:3.亚硝基铁氰化钠一氢氧化钠的(Legal)试剂:2.醋酐一浓碱酸(Liebermann)试剂:2.三氯化锑(Carr-Price)试剂:25g三氯化锑溶于15g氯仿中(亦可用氯仿或四氯化碳的饱和溶液). 1.双缩脲(Biuret)试剂:
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biuret reaction:双缩脲反应
⒉双缩脲反应(biuret reaction) 蛋白质和多肽分子中肽键在稀碱溶液中与硫酸铜共热,呈现紫色或红色,称为双缩脲反应. 氨基酸不出现此反应. (一)碱基的种类:构成核苷酸的五种碱基(base)分别属于嘌呤(purine)和嘧啶(pyrimidine)两类含氮杂环化合物(见图2-1).
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biuret linkage:缩二脲键(合)
biurea | 联二脲 | biuret linkage | 缩二脲键(合) | biuret reaction | 双缩脲反应
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fatty oil:双缩脲反应
甲醛一浓硫酸试液 fat | 双缩脲反应 fatty oil | 脂肪 de-fatting
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bicollateral vascular bundle:双韧型维管束
双韧管状中柱|amphiphloic siphonostele | 双韧型维管束|bicollateral vascular bundle | 双缩脲反应|biuret reaction
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dicetyl ether; cetyl ether:双十六基醚;鲸蜡醚;十六醚
环双脲;双脲;对脲[口+井] dicarbamide; diurea; p-urazine | 双十六基醚;鲸蜡醚;十六醚 dicetyl ether; cetyl ether | 二氯胺T;对甲苯磺酰二氯胺 dichloramine-T
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diphasic titration:双相滴定
双缩脲反应|biuret reaction | 双相滴定|diphasic titration | 双相死亡率|two phase mortality
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Gies'biuretreagent:吉斯缩二脲试剂 盖斯氏双缩脲试剂
Giemsastain 吉姆沙染色剂 | Gies'biuretreagent 吉斯缩二脲试剂 盖斯氏双缩脲试剂 | Giffard'sinjector 吉法德喷射器 吉法德蒸汽喷射器