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傅立叶红外光谱法快速筛选PVC保鲜膜及增塑剂DEHA 被引量:5
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作者 俞雄飞 林振兴 +2 位作者 邬蓓蕾 华正江 袁丽凤 《检验检疫科学》 2006年第5期31-33,共3页
[目的]建立快速、简便的鉴别PVC膜及其增塑剂类别的方法。[方法]以环己酮为溶剂,无水乙醇为沉淀剂,应用溶解DD沉淀法进行聚合物与增塑剂的分离,采用红外光谱透射法定性测定聚氯乙烯(PVC)及其增塑剂成分(DEHA)。[结果]将分离纯化后的样... [目的]建立快速、简便的鉴别PVC膜及其增塑剂类别的方法。[方法]以环己酮为溶剂,无水乙醇为沉淀剂,应用溶解DD沉淀法进行聚合物与增塑剂的分离,采用红外光谱透射法定性测定聚氯乙烯(PVC)及其增塑剂成分(DEHA)。[结果]将分离纯化后的样品与浓缩得到的较纯的增塑剂分别进行红外光谱透射检测,将得到的光谱图进行谱库搜索,结果分别是PVC和DEHA,匹配率分别为92.2%和96.8%。[结论]该法简单、快速、安全、准确。 展开更多
关键词 红外光谱法 增塑剂 聚氯乙烯
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印度洋深海热液区贻贝足丝结构和性能特征研究 被引量:2
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作者 谢林青 曹为 +2 位作者 蒋凤华 李景喜 孙承君 《海洋与湖沼》 CAS CSCD 北大核心 2022年第2期364-374,共11页
贻贝营半固着生活,依靠足丝将自己牢固地黏附在底物上。足丝的结构和性能对贻贝的正常生命活动至关重要。为研究热液区极端环境下深海贻贝足丝的结构和性能,采集了印度洋龙旂深海热液区的贻贝(Bathymodiolus marisindicus)足丝,对其力... 贻贝营半固着生活,依靠足丝将自己牢固地黏附在底物上。足丝的结构和性能对贻贝的正常生命活动至关重要。为研究热液区极端环境下深海贻贝足丝的结构和性能,采集了印度洋龙旂深海热液区的贻贝(Bathymodiolus marisindicus)足丝,对其力学特性、结构特征和组分进行了分析。力学性能测试发现与近海贻贝(Mytilus galloprovincialis)相比,B.marisindicus足丝的力学性能表现为模量小、弹性小、弹性缓冲较差。傅里叶变换红外光谱(Fourier Transform infrared spectrometer,FT-IR)分析显示深海热液区贻贝足丝的主要成分是胶原蛋白,官能团特征显示足丝蛋白含大量的β折叠结构,足丝近端和远端的二级结构梯度较小。扫描电镜(scanning electron microscope,SEM)结果显示热液区贻贝足丝表面光滑,内部结构呈纤维状整齐排列。氨基酸分析结果显示深海热液区贻贝足丝中甘氨酸、脯氨酸含量高于近海贻贝足丝,这可能会增加足丝蛋白中三螺旋结构的稳定性,使足丝在热液环境中保持性能稳定。热液区深海贻贝足丝独特的力学性能、结构特征和组分特征为研究热液区贻贝的环境适应性提供了一定的基础。 展开更多
关键词 热液区贻贝 足丝 力学性能 傅里叶变换红外光谱(fourier transform infrared spectrometer ft-ir) 扫描电镜 氨基酸分析
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Infrared spectra study associated with hydrogen impurity in low pressure CVD diamond films
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作者 Huifang Fu Xianghui Zhang +1 位作者 Entao Yan Shunsheng Liu 《Chinese Science Bulletin》 SCIE EI CAS 1999年第16期1508-1511,共4页
The infrared absorbance peaks at 2 852.4, 2 924.3, 2963.0 and 3 034.9 cm-1 have been observed in diamond films made by the direct current arc discharge plasma chemical vapor deposition. Three former absorbance peaks h... The infrared absorbance peaks at 2 852.4, 2 924.3, 2963.0 and 3 034.9 cm-1 have been observed in diamond films made by the direct current arc discharge plasma chemical vapor deposition. Three former absorbance peaks have been assigned to C-H stretching in SP3 configuration, 3 034.9 cm-1 has been assigned to C-H stretching in SP2 configuration. The 展开更多
关键词 DIAMOND HYDROGEN IMPURITY CVD fourier transform infrared spectroscopy (ft-ir).
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Preparation of Carboxymethyl Cellulose Fibers
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作者 刘树勇 闻林刚 +3 位作者 王志亮 沈端 李皆富 杨曙光 《Journal of Donghua University(English Edition)》 EI CAS 2016年第3期366-369,共4页
Carboxymethyl cellulose(CMC) fibers were produced by extruding the CMC solution into the metal salt coagulation bath and collected with a winding machine.It was found that copper chloride,ferric chloride,cerium chlori... Carboxymethyl cellulose(CMC) fibers were produced by extruding the CMC solution into the metal salt coagulation bath and collected with a winding machine.It was found that copper chloride,ferric chloride,cerium chloride,lanthanum chloride and aluminum nitrate solution could be used as coagulation bath to prepare CMC fibers,whereas the metal salt solutions,such as nickel chloride,zinc chloride,calcium chloride and magnesium chloride,could not.The fiber formation is due to the coordination between the carboxylates of CMC and metal ion.Fourier transform infrared spectroscopy(FTIR) was applied to studying the coordination mode of CMC and metal ion.The metal salt concentration,pH value and temperature of the coagulation bath affect the tenacity and elongation of the fiber.CMC fibers show good water uptake ability and can adsorb water more than 200% of its own weight.The mechanical behaviors of CMC fiber show dependence on environment humidity. 展开更多
关键词 FIBER carboxymethyl cellulose(CMC) fourier transform infrared spectroscopy(ft-ir) COORDINATION
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Molecular interactions between anticancer drugs and iodinated contrast media: An in vitro spectroscopic study
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作者 Ryoichi Ishii Hiromu Mori +5 位作者 Kenji Matsumura Norio Hongo Hiro Kiyosue Shunro Matsumoto Takeshi Yoshimi Seiji Ujiie 《Journal of Biomedical Science and Engineering》 2012年第1期24-33,共10页
Purpose: The purpose of this study is to assess molecular interactions between several anticancer drugs and an iodinated contrast medium by Fourier transform infrared spectroscopy (FT-IR) and ultraviolet-visible spect... Purpose: The purpose of this study is to assess molecular interactions between several anticancer drugs and an iodinated contrast medium by Fourier transform infrared spectroscopy (FT-IR) and ultraviolet-visible spectroscopy (UV-Vis). Materials and Methods: Iopamidol (IPM) was used as an iodinated contrast medium, and mitomycin C (MTI), epirubicin hydrochloride (EPI), cisplatin (CDDP), 5-fluorouracil (5FU), irinotecan hydrochloride (CPT11), gemcitabine hydrochloride (dFdC), carboplatin (CBDCA), oxaliplatin (1OHP), paclitaxel hydrochloride (TAX) and docetaxel trihydrate (TXT) were used as anticancer drugs. For FT-IR, the purified IPM was mixed stoichiometrically with each anticancer drug as well as with a combination of MTI and EPI. After measuring each separated sample and the mixtures, the spectra of the mixtures were compared with the spectra of the sum of pure samples or the combination. For UV-Vis, IPM and anticancer drugs were dissolved in pure water;subsequently for the titration experiments, the mixtures were prepared by varying the molar ratio. IR absorption corresponds to stretching vibrations between atoms having covalent bonding, whereas UV-Vis spectra depend on molecular dynamics and shapes. Both UV-Vis and IR spectra change when there are molecular interactions such as aromatic ring stacking and hydrogen bonding. Result: IPM exhibited molecular interactions with MTI, EPI, CDDP, dFdC, CBDCA, 1OHP, TAX and TXT, as well as with the combination of MTI and EPI on FT-IR. However, molecular interactions were not observed on UV-Vis. Conclusion: Several anticancer drugs have molecular interactions with IPM, which could be clinically utilized for superselective intraarterial infusion chemotherapy. 展开更多
关键词 BLAST Molecular Interactions ANTICANCER Drugs Iodinated Contrast Medium fourier transform infrared (ft-ir) SPECTROSCOPY Ultraviolet-Visible (UV-Vis) SPECTROSCOPY
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Molecular modeling and spectroscopic studies on the binding of guaiacol to human immunoglobulin 被引量:5
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作者 HE Wenying1,2, YAO Xiaojun1, LIU Pengjun2, GAO Zhenxia2 & HU Zhide1 1. Department of Chemistry, Lanzhou University, Lanzhou 730000, China 2. Department of Chemistry, Hainan Normal University, Hainan 571158, China 《Science China Chemistry》 SCIE EI CAS 2006年第6期550-559,共10页
The fluorogenic property of guaiacol was exploited for the first time to analyze the interaction with target protein as a probe by molecular modeling, fluorescence, circular dichroism (CD) and Fourier transform infrar... The fluorogenic property of guaiacol was exploited for the first time to analyze the interaction with target protein as a probe by molecular modeling, fluorescence, circular dichroism (CD) and Fourier transform infrared (FT-IR) spectroscopy. Molecular docking was performed to reveal the possible binding mode or mechanism and suggested that guaiacol can strongly bind to human immu- noglobulin (HIgG). It is considered that guaiacol binds to HIgG mainly by a hydrophobic interaction and there are two hydrogen bond interactions between the drug and the residues LEU 80 and ASP 65, which is in good agreement with the results from the experimental thermodynamic parameters (the enthalpy change △H0 and the entropy change △S0 were calculated to be 65.55 kJ·mol-1 and 132.95 J·mol-1·K-1 according to the Vant’ Hoff equation). Data obtained by the fluorescence spectroscopy indicated that binding of guaiacol with HIgG leads to dramatic enhancement in the fluorescence emission intensity along with significant occurrence of efficient Frster resonance energy transfer (FRET) from the residue of HIgG to the protein bound guaiacol. From the low value of fluorescence anisotropy (r = 0.06), it is argued that the probe molecule is located in the motionally unrestricted environment of the protein. The alterations of protein’s secondary structure in the presence of guaiacol in aqueous solution were quantitatively calculated by the evidences from FT-IR and CD spectroscopes. 展开更多
关键词 guaiacol human immunoglobulin molecular modeling fluorescence enhancement fourier transform infrared (ft-ir) spectroscopy circular DICHROISM (CD).
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Spectrofluorimetric Study on the Weak Interaction between ATP and Na-4-Tosyl-L-arginine Methyl Ester Hydrochloride 被引量:3
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作者 马彦青 吕功煊 +2 位作者 李颖 刘书花 鲜亮 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2007年第9期1253-1258,共6页
In this paper, some new results on the selective weak interaction between Na-4-tosyl-L-arginine methyl ester hydrochloride (TAME) and adenosine-5'-triphosphate (ATP) have been reported. Fluorescence spectrophotom... In this paper, some new results on the selective weak interaction between Na-4-tosyl-L-arginine methyl ester hydrochloride (TAME) and adenosine-5'-triphosphate (ATP) have been reported. Fluorescence spectrophotometry and Fourier transform infrared (FT-IR) spectroscopy were used to investigate this kind of weak interaction. In fluorescence experiments, obvious fluorescence quenching phenomena were observed when TAME was added, which indicated the weak interactions between TAME and ATP. It has been identified by fluorescence titration experiments that TAME exhibited high selectivity to ATP over ADP and AMP. FT-IR spectral results showed that an ATP-TAME adduct was formed. The experimental results indicated that the interaction sites were the guanidinium group of TAME main-chain and the γ-phosphate group of ATP, and the interaction took place through hydrogen bonding and electrostatic force. In addition, the effects of metal ions on the weak interaction between ATP and TAME, or between ATP and analogues of L-arginine were studied. 展开更多
关键词 Na-4-tosyl-L-arginine methyl ester hydrochloride adenosine-5'-triphosphate (ATP) binding site fluorescence quenching fourier transform infrared (ft-ir spectra
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Crosslinking of PVA Pervaporation Membrane by Maleic Acid
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作者 孟平蕊 陈翠仙 +2 位作者 余立新 李继定 蒋维钧 《Tsinghua Science and Technology》 EI CAS 2000年第2期172-175,共4页
Maleic acid (MA) crosslinked polyvinyl alcohol (PVA) membrane is prepared using a high temperature esterification reaction between PVA and MA in the presence of sulfuric acid as a catalyst. The crosslinking reaction ... Maleic acid (MA) crosslinked polyvinyl alcohol (PVA) membrane is prepared using a high temperature esterification reaction between PVA and MA in the presence of sulfuric acid as a catalyst. The crosslinking reaction mechanism is investigated using FT IR spectral analysis. The results indicate that maleic acid reacts with hydroxyl groups in PVA to form mono and bis ester in a two step process. 展开更多
关键词 PERVAPORATION polyvinyl alcohol (PVA) maleic acid (MA) crosslinking mechanism fourier transform infrared (ft-ir) spectrometry
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