检索结果-南通市图书馆

Determination of Residual Acrylamide in Medical polyacrylamide hydrogel by High Performance Liquid Chromatography tandem Mass Spectroscopy

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2009年第1期22卷 28-31页

作者： WEI-WEI LI HUI LI ZHI-FEI LIU QUN QIAO Department of Plastlc and Cosmetic Surgery Pekmg Union Medical College Hospital Chinese Academy of Medical Sciences Beijing 100032 China Department of Ecsomatics Beijing Health School Beijing 100053 China

Objective To determine residual acrylamide in medical polyacrylamide hydrogel by high performance liquid chromatography tandem mass spectroscopy （HPLC-MS）. Methods After 13C3 labeled acrylamide was added, the sample was extracted with water and then cleaned up with ExtrelutTM 20. The polyacrylamide hydrogel sample and 20 clinical cases were analyzed by HPLC-MS/MS and isotope dilution quantifying technique in selected reaction monitoring （SRM） mode. Results Acrylamide was separated from polyacrylamide hydrogel. The concentration of acrylamide in polyacrylamide hydrogel ranged from 3.9×10^-9 to 3.1×10^- 8g/L in the 20 clinical cases. The peak area was favorable linear and the range was up to 3 000 μg/L. The recovery rate was 103.1% with a relative standard deviation （RSD） of 6.20%, when the mark level was 50 lag/L. Conelusion HPLC-MS is a rapid, accurate, and sensitive method for the determination of residual acrylamide in medical polyacrylamide hydrogel.

关键词： High performance liquid chromatography-mass spectroscopy polyacrylamide hydrogel Acrylamide

ADDITIVE-INDUCED ENHANCEMENT OF OPTICAL CLARITY OF polyacrylamide hydrogel

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2003年第5期21卷 533-539页

作者： Jeffery Franklin Department of Chemistry Carleton University 1125 Colonel By Drive Ottawa Ontario Canada KIS 5B6

The aqueous polymerization of acrylamide and crosslinking with N,N-methylenebisacrylamide afforded hydrogelsdisplaying high levels of light scattering (poor optical clarity). Enhancement of the optical clarity within a polyacrylamide(PAm) hydrogel was accomplished through the implementation of 'refractive index matching'. Water-soluble additives wereutilised to better match the refractive index inhomogeneities throughout a given hydrogel. This resulted in lower lightscattering within the system and hence improved clarity. Amino acids, sugars, polymers, and other water-soluble additivessuch as glycerol were investigated by this methodology. Most additives investigaed displayed potential for effectivelyreducing the light scattering within a PAm hydrogel as a function of increased additive concentration. On increasing therefractive index of the water medium, the overall refractive index of a PAm hydrogel was also observed to increase. Thisprovided a quantitative means of determining the effectiveness of a given additive for improving the optical clarity within ahydrogel.

关键词： Optical clarity polyacrylamide hydrogel Refractive index matching Bacteriorhodopsin Optical memory device

hydrogel-based optically and mechanically manipulable broadband microwave absorber

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第7期16卷 10175-10182页

作者： Xiqiao Chen Lin Du Guobao Jiang Zhuang Wu Yingchang Zou Yanhong Zou School of Electronic Information and Electrical Engineering Changsha UniversityChangsha 410022China School of Physics and Electronics Hunan UniversityChangsha 410082China

Microwave absorbers with unique optical and mechanical performance are urgent for complex electromagnetic environment.Here,we demonstrate the mechanically flexible,optically transparent,and microwave-absorbing polyacrylamide(PAM)hydrogel,in which the polar water molecules with high polarization contribute to the efficient microwave attenuation,but the binding between water molecules and PAM will slow down the orientation polarization of polar molecules.Meanwhile,the dominated dielectric property of water molecules in PAM hydrogel determines that the molecules displacement in polymer mixture is feasible for manipulating permittivity.Besides,by decreasing temperature,the flexible and transparent hydrogel will switch to rigid and opaque state as the phase conversion between amorphous and polycrystal state.By constructing structures with such hydrogel,the obtained absorber also exhibits the optical and mechanical switchable properties,covering the effective absorption within 5.7-18 GHz.This work provides an effective method to fabricate optically and mechanically manipulable microwave absorbers for intelligent electromagnetic stealth systems.

关键词： microwave absorption polyacrylamide hydrogel optical properties mechanical properties

Response of Photonic hydrogels of Homogeneous Particles to Uranyl Ions in Aqueous Solutions

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonic Sensors 2023年第4期13卷 50-61页

作者： R.G.JOSHI Deepak K.GUPTA P.AMESH P.K.PARIDA T.R.RAVINDRAN Materials Science Group Indira Gandhi Centre for Atomic ResearchA CI of Homi Bhabha National InstituteKalpakkam 603102India Materials Chemistry and Metal Fuel Cycle Group Indira Gandhi Centre for Atomic ResearchA CI of Homi Bhabha National InstituteKalpakkam 603102India Metallurgy and Materials Group Indira Gandhi Centre for Atomic ResearchA CI of Homi Bhabha National Institute(HBNI)Kalpakkam 603102India

We study here the response of photonic hydrogels(PHs),made of photonic crystals of homogeneous silica particles in polyacrylamide hydrogels(SPHs),to the uranyl ions 22 UO_(2)^(2+) in aqueous solutions.It is found that the reflection spectra of the SPH show a peak due to the Bragg diffraction,which exhibits a blue shift in the presence of 22 UO_(2)^(2+).Upon exposure to the SPH,22 UO_(2)^(2+)gets adsorbed on the SPH and forms complex coordinate bonds with multiple ligands on the SPH,which causes shrinking of hydrogel and leads to the blue shift in the diffraction peak.The amount of the blue shift in the diffraction peak increases monotonically up to 22 UO_(2)^(2+)concentrations as high as 2300μM.The equilibration time for the shift in the Bragg peak upon exposure to 22 UO_(2)^(2+)is found to be~30 min.These results are in contrast to the earlier reports on photonic hydrogels of inhomogeneous microgel particles hydrogel(MPH),which shows the threshold 22 UO_(2)^(2+)concentration of~600μM,below which the diffraction peak exhibits a blue shift and a change to a red shift above it.The equilibration time for MPH is~300 min.The observed monotonic blue shift and the faster time response of the SPH to 22 UO_(2)^(2+)as compared to the MPH are explained in terms of homogeneous nature of silica particles in the SPH,against the porous and polymeric nature of microgels in the MPH.We also study the extraction of 22 UO_(2)^(2+)from aqueous solutions using the SPH.The extraction capacity estimated by the arsenazo-III analysis is found to be 112 mM/kg.

关键词： Photonic hydrogels uranium extraction and monitoring arsenazo-Ⅲ-uranium complex polyacrylamide hydrogel UV-visible spectroscopy

polyacrylamide gel migration after injection for breast augmentation:A case report

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal Of Plastic and Reconstructive Surgery 2022年第1期4卷 20-24页

作者： Rongshuai Yan Yujie Lan Zeyuan Lei Yao Chen Dongli Fan Yiming Zhang Shaoliang Wang Department of Plastic and Cosmetic Surgery Xinqiao HospitalArmy Medical UniversityChongqing 400037China

polyacrylamide hydrogel(PAAG)was once considered a safe,reliable,and compatible injected filler and was widely used in breast augmentation,rhinoplasty,and other cosmetic surgeries.However,numerous complications,such as implant migration,have been observed after PAAG injections.Herein,we report a rare case of distant implant migration after PAAG injection for breast augmentation in which the material became displaced along the abdominal wall to the perineum and pelvic extraperitoneal space.After a well-prepared preoperative evaluation involving magnetic resonance imaging(MRI)and computed tomography(CT)examinations and threedimensional hologram,debridement surgery was performed to remove the injected material.After the operation,the patient was followed up for two years and was not scheduled for a second operation.Postoperative complications of breast augmentation after PAAG injection,especially gel migration,still affect thousands of patients.Once material migration occurs,surgical removal becomes difficult.Early diagnosis and treatment are recommended.

关键词： polyacrylamide hydrogel Surgical complication Material migration Breast augmentation

医用聚丙稀酰胺水凝胶乳房填充术并发症及其治疗

在线全文

学校读者我要写书评

暂无评论

医用聚丙稀酰胺水凝胶乳房填充术并发症及其治疗