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微谱技术在未知涂料关键组分剖析中的应用 被引量:2
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作者 裴克梅 郑万凯 +3 位作者 王伟民 董月林 姚飞 董群峰 《中国涂料》 CAS 2017年第10期61-65,共5页
采用高效分离技术结合微谱技术实现了对未知涂料关键组分(成膜物质、溶剂、助剂、填料)的全面剖析。综合使用了溶解沉淀、超声波萃取、柱层析分离等方法对待分析涂料实现了高效分离,在以涂料成膜物质为剖析重点的基础上,同时结合其他组... 采用高效分离技术结合微谱技术实现了对未知涂料关键组分(成膜物质、溶剂、助剂、填料)的全面剖析。综合使用了溶解沉淀、超声波萃取、柱层析分离等方法对待分析涂料实现了高效分离,在以涂料成膜物质为剖析重点的基础上,同时结合其他组分(溶剂、助剂和填料)的物理化学性质,并有机结合各组分的各种微谱(红外光谱、质谱、色谱、核磁共振波谱、X射线衍射谱),对涂料中的关键成分进行了系统分析。 展开更多
关键词 微谱技术 涂料 剖析 关键组分
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涂料用树脂结构及相对分子质量的微谱解析 被引量:1
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作者 董月林 裴克梅 《现代涂料与涂装》 CAS 2018年第1期23-26,共4页
构建了涂料用树脂的分子结构及相对分子质量解析的微谱技术方法并成功应用于未知涂料树脂的微观解析。构建的微谱系统分析技术主要基于红外振动光谱、核磁共振波谱、裂解气质联用仪、凝胶色谱仪的综合使用和分析。通过构建的微谱技术对... 构建了涂料用树脂的分子结构及相对分子质量解析的微谱技术方法并成功应用于未知涂料树脂的微观解析。构建的微谱系统分析技术主要基于红外振动光谱、核磁共振波谱、裂解气质联用仪、凝胶色谱仪的综合使用和分析。通过构建的微谱技术对一种进口未知涂料用树脂进行了细致的研究,获得了树脂的详细结构、相对分子质量及其分布信息,为树脂尤其是涂料用树脂的结构和相对分子质量解析提供了一种综合、系统、高效的技术方法。 展开更多
关键词 微谱技术 涂料 剖析 树脂
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Microbiological Transformation of Ginsenoside Rg_1 被引量:14
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作者 董阿玲 崔亚君 +2 位作者 郭洪祝 郑俊华 果德安 《Journal of Chinese Pharmaceutical Sciences》 CAS 2001年第3期115-118,共4页
Forty-nine microbial strains were used to screen their ability for the microbiological transforma-tion of ginsenoside Rg1. Aspergillus niger (3.1858) and Absidia coerulea (3.3538) were found to convert ginsenoside Rg1... Forty-nine microbial strains were used to screen their ability for the microbiological transforma-tion of ginsenoside Rg1. Aspergillus niger (3.1858) and Absidia coerulea (3.3538) were found to convert ginsenoside Rg1 efficiently to less polar metabolites. Preparative scale transformation with both fungi Absidia coerulea (3.3538) and Aspergillus niger (3.1858) have resulted in the production of one same metabolite (MT1). Its structure was char-acterized as 6-O-b-D-glucopyranosyl-20(S)-protopanaxatriol (Ginsenoside Rh1) on the basis of its TOF-MS and 1H, 13C NMR spectral data. The biotransformation kinetic curves for Ginsenoside Rg1 and MT1 were reported for the first time, and the biotransformation pathway was proposed. 展开更多
关键词 Microbiological transformation Ginsenoside Rg1 Ginsenoside Rh1 MICROORGANISM FUNGI
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Study on the Chromatographic Fingerprint of Volatile Constituents from Acacia Honey 被引量:19
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作者 夏立娅 张晓宇 +1 位作者 王庭欣 马英松 《Agricultural Science & Technology》 CAS 2010年第6期42-44,共3页
[Objective] The experiment aimed to study chromatographic fingerprint in volatile components of acacia honey and provide scientific evaluation and effective control on quality of acacia honey.[Method] Using solid-phas... [Objective] The experiment aimed to study chromatographic fingerprint in volatile components of acacia honey and provide scientific evaluation and effective control on quality of acacia honey.[Method] Using solid-phase microextraction method to separate and detect volatile components and construct chromatographic fingerprint.[Result] The honey was preheated for 15 min in water bath at 40 ℃ and solid-phase microextraction 85 μmPA was used to extract in overhead air about 30 min,then put it into the injector and desorpted 3 min,which is in 230 ℃.The Supelco WaxTM10 30 m×0.25 mm×0.25 μm column and gradient heating program was the best method to separate volatile components from honey.83 fingerprint peaks were constructed,among which 17 common fingerprint peaks were comprised of chromatographic fingerprint of volatile components of acacia honey.[Conclusion] The chromatographic fingerprint could provide reference for quality control of acacia honey. 展开更多
关键词 HONEY Volatile components Solid-phase microextraction technology Gas chromatography Fingerprint.
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Cu(Ⅱ),Ni(Ⅱ)Complexation with Acid Alizarine Blue B in the Presence of Cetyltrimethylammonium Bromide
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作者 沈荣 郜洪文 俞汉青 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 北大核心 2006年第2期178-182,共5页
The coordination reactions of Cu(Ⅱ) and Ni(Ⅱ) with acid alizarine blue B (AABB) in the presence of cetyltrimethylammonium bromide (CTAB) micelle were investigated using the microsurface adsorptionspectral co... The coordination reactions of Cu(Ⅱ) and Ni(Ⅱ) with acid alizarine blue B (AABB) in the presence of cetyltrimethylammonium bromide (CTAB) micelle were investigated using the microsurface adsorptionspectral correction technique (MSASC). The aggregation of AABB on CTAB followed the Langmuir isothermal adsorption law. The enrichment of AABB on CTAB sensitized the complexation between Cu(Ⅱ) or Ni(Ⅱ)and AABB. The binding ratio of AABB to CTAB was 1:2.5, and monomeric aggregate, AABB2CTAB5, was formed with an adsorption constant of 5.95×10^5 at 20 ℃ or 2.48×10^5 at 40 ℃. In the ternary complexation, the ratio of AABB:Cu and AABB:Ni were 1:1 and 1:2.5, respectively. Two types of aggregates, Cu2.AABB2·CTAB80 and Ni5.AABB2.CTAB80, were formed. 展开更多
关键词 Microsurface adsorption-spectral correction technique Langmuir aggregation Acid alizarine blue B Cetyltrimethylammonium bromide Ternary complex
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Characterization of Specific Spoilage Bacteria and Volatile Flavor Compounds of Flavored Crayfish 被引量:3
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作者 YU Mei-juan TAN Huan +1 位作者 HE Shuang YANG Hui 《Agricultural Science & Technology》 CAS 2021年第3期42-50,共9页
It is a common issue in the processing industry of crayfish that flavored crayfish stored at room temperature is perishable.In order to establish an effective putrid prediction mechanism,high-throughput sequencing and... It is a common issue in the processing industry of crayfish that flavored crayfish stored at room temperature is perishable.In order to establish an effective putrid prediction mechanism,high-throughput sequencing and solid phase microextraction gas chromatography-mass spectrometry(SPME-GCMS)were used to analyse the microbial community structure and volatile flavor compounds of normal and putrid crayfish.The results showed that Aeromonas(57%),Macrococcus(7.7%),Vibrio sp.(6.6%),Acinetobacter(5%),Citrobacter(4.9%)and Enterobacter(1.49%)were the main bacterial genus in the refrigerated fresh crayfish(HNA).And Staphylococcus(17.04%),Aeromonas(4.46%),Xanthomonas(4.16%),Streptococcus(4.62%)and Enterococcus(2.77%)were the main bacterial genus in the marinated and refrigerated crayfish(HND).With the spoilage of samples(HNE and HNC),the diversity of bacteria decreased,and the specific spoilage bacteria grew rapidly,mainly Enterococcus,Bacillus,Lactobacillus,Leuconostoc,Weissella.Meanwhile,the volatile compounds in non-spoilage sample(HNA and HND)were mainly alkane compounds,aldehydes compound and esters compounds;and the volatile compounds in spoilage samples were mainly alcohols,acids,benzene compounds,terpenoids,N-containing compounds,S-containing compounds and ethers.This indicated that the contents and types of volatile compounds changed with the sample spoilage and deterioration.Correlation analysis results showed that Enterococcus,Lactobacillus and Bacillus were significantly positively correlated with alcohols,acids,benzene,terpenoids,N-containing compounds,S-containing compounds and ether compounds,while Aeromonas,Megasphaera,Acinetobacter,Citrobacter and Vibrio were significantly positively correlated with alkane compounds and esters compounds,and Leuconostoc were significantly positively correlated with alcohol compounds.These results can provide a theoretical guidance for the storage of cooked flavor crayfish at room temperature. 展开更多
关键词 CRAYFISH High-throughput sequencing SPME-GC-MS Microbial community structure Volatile compounds
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Scanning Raman Picoscopy: Angstrom-Resolved Tip-Enhanced Raman Spectromicroscopy
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作者 Yao Zhang Yang Zhang Zhen-chao Dong 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2021年第1期1-14,I0011,共15页
In this review,we present a brief overview on the recent advances in Angstr6m-resolved tip-enhanced Raman spectromicroscopy.We first introduce the theoretical understanding of the confinement of light at the atomistic... In this review,we present a brief overview on the recent advances in Angstr6m-resolved tip-enhanced Raman spectromicroscopy.We first introduce the theoretical understanding of the confinement of light at the atomistic scale,and explain how the Raman scattering from a single molecule happens under the“illumination”of such an atomically confined light.Then we describe the latest developments on Angstr6m-resolved tipenhanced Raman spectromicroscopy,particularly on a new methodology called“scanning Raman picoscopy”for visually cons true ting the chemical st ruc ture of a single molecule in real space.Finally,we give a perspective of this technique in various applications where iden ti fying the chemical st ruc tu res of mat erials at the chemical bond level is required. 展开更多
关键词 Scanning Raman picoscopy Tip-enhanced Raman spectroscopy Structural determination Picocavity plasmon Angstr6m resolution
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Effects of ultrasonic dispersion on structure of electrodeposited Ni coating on AZ91D magnesium alloy 被引量:2
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作者 吴化 赵国良 +2 位作者 穆君伟 李雪松 何毅 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第B07期703-707,共5页
To obtain the refined electrodeposited nickel layer on AZ91D magnesium alloy,ultrasonic technology was applied in the processes of pre-treatment and electrodeposition.The phases of pre-treatment layer and the nickel c... To obtain the refined electrodeposited nickel layer on AZ91D magnesium alloy,ultrasonic technology was applied in the processes of pre-treatment and electrodeposition.The phases of pre-treatment layer and the nickel coating were analyzed by X-ray diffractometry(XRD)and X-ray photoelectron spectroscopy(XPS),and the microstructure was observed by scanning electron microscopy(SEM).Then,the effects of ultrasonic dispersion on the microstructure of pre-treatment layer and the grain refinement of electrodeposited nickel layer were discussed.The results showed that the pre-treatment electrodeposited Cu-Sn layer with compact microstructure could be synthesized in alkaline copper-tin liquid with ultrasonic agitation,as a result,smooth and refined nickel coating formed on AZ91D magnesium alloy.On the other hand,preferred orientation in the coating decreased because of the refined grains. 展开更多
关键词 AZ91D magnesium alloy Cu-Sn layer Ni coating ELECTRODEPOSITION ultrasonic dispersion
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Semi-supervised kernel FCM algorithm for remote sensing image classification
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作者 刘小芳 HeBinbin LiXiaowen 《High Technology Letters》 EI CAS 2011年第4期427-432,共6页
These problems of nonlinearity, fuzziness and few labeled data were rarely considered in traditional remote sensing image classification. A semi-supervised kernel fuzzy C-means (SSKFCM) algorithm is proposed to over... These problems of nonlinearity, fuzziness and few labeled data were rarely considered in traditional remote sensing image classification. A semi-supervised kernel fuzzy C-means (SSKFCM) algorithm is proposed to overcome these disadvantages of remote sensing image classification in this paper. The SSKFCM algorithm is achieved by introducing a kernel method and semi-supervised learning technique into the standard fuzzy C-means (FCM) algorithm. A set of Beijing-1 micro-satellite's multispectral images are adopted to be classified by several algorithms, such as FCM, kernel FCM (KFCM), semi-supervised FCM (SSFCM) and SSKFCM. The classification results are estimated by corresponding indexes. The results indicate that the SSKFCM algorithm significantly improves the classification accuracy of remote sensing images compared with the others. 展开更多
关键词 remote sensing image classification semi-supervised kernel fuzzy C-means (SSKFCM)algorithm Beijing-1 micro-satellite semi-supcrvisod learning tochnique kernel method
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Stablility and Size Control of Silver Nanoparticles by Electrochemical Method
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作者 Sudad S. Ahmed Rawa K. Ibrahim +3 位作者 Asama N. Naje Kais A1-Naimee Abdulla A. Suhail Omar A.Ibrahim 《Journal of Physical Science and Application》 2016年第1期16-25,共10页
Silver nanoparticles (Ag-NPs) were prepared using an electrochemical technique. The optical properties were measured by absorption spectroscopy. The dimension of the prepared nanoparticles as estimated by the Atomic... Silver nanoparticles (Ag-NPs) were prepared using an electrochemical technique. The optical properties were measured by absorption spectroscopy. The dimension of the prepared nanoparticles as estimated by the Atomic Force Microscope (AFM), was 91.57 nm. This reaserch effort proposes a mechanism for reducing the size of silver nanoparticles by adding the hydrogen peroxide (H202), and protecting the silver nanoparticle to inhibit agglomeration by adding PVP polymer. 展开更多
关键词 Electrochemical method silver nanoparticles hydrogen peroxide PVP.
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Applications of multiplexed immunohistochemistry/immunofluorescence and multispectral imaging technology in the field of tumor immunotherapy 被引量:2
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作者 Wenzhe Li Xia Yuan +1 位作者 Bo Xu Shuxiang Song 《Journal of Chinese Pharmaceutical Sciences》 CAS CSCD 2020年第10期734-747,共14页
Multiplexed immunohistochemistry/fluorescence(mIHC/IF)in combination with multispectral unmixing is a novel multitarget histopathological staining and imaging technique.By simultaneously revealing expression level and... Multiplexed immunohistochemistry/fluorescence(mIHC/IF)in combination with multispectral unmixing is a novel multitarget histopathological staining and imaging technique.By simultaneously revealing expression level and spatial information for up to eight biomarkers in situ,in addition to a nuclear stain within a single formalin-fixed paraffin-embedded(FFPE)tissue section,this technology can analyze the phenotype,abundance,morphology and intercellular relationship of cells while providing statistically significant results.In recent years,technical improvements have brought new insight into mIHC/IF and multispectral imaging approaches,which have been successfully applied in the field of cancer immunotherapy,specifically in regard to tumor microenvironment research,immunotherapy drug discovery,and prognostic and metastatic risk evaluation.This review highlights the principle,workflow,advantages and disadvantages of the technology,and discusses the latest applications of mIHC/IF-based imaging technology in the field of TME-related research and immunotherapy drug discovery. 展开更多
关键词 Multiplexed immunohistochemistry/immunofluorescence(mIHC/IF) Multispectral imaging Tumor microenvironment Tumor immunotherapy
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