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Accurate Quantification of Pure Thiacloprid with Mass Balance and Quantitative H-NMR

Journal of Analysis and Testing 2024年第1期8卷 1-8页

作者： Mengling Tu Wei Zhang Yunxiao Zhu Wen Ma Xiao Li Shukun Zhou Hongmei Li Xianjiang Li key laboratory of chemical metrology and applications on nutrition and health for state market regulation Division of Metrology in ChemistryNational Institute of MetrologyBeijing 100029China state key laboratory of Heavy Oil Processing College of Chemical Engineering and EnvironmentChina University of PetroleumBeijing 102249China state key laboratory of Natural and Biomimetic Drugs School of Pharmaceutical SciencesPeking UniversityBeijing 100191China

Thiacloprid is the first-generation neonicotinoid insecticide,which is widely used in modern *** materials are essential for sound measurement and traceability of results in chemical *** thiacloprid was comprehensively assessed by two orthonormal methods:mass balance(MB) and quantitative nuclear magnetic resonance spectroscopy(qNMR).From MB,its mass fraction value was 998.4 mg/g with the subtraction of structurally related impurities(99.87%),inorganic impurities(0.006 mg/g),water(0.33 mg/g),and volatile organic solvent(0 mg/g).To guarantee sufficient separation of structurally related purity,peak purity of thiacloprid was evaluated by five points of UV *** the qNMR of hydrogen,its mass fraction value was 995.7 mg/g which was traced to the internal standard(methyl sulfone).Finally,the certified value was assigned to 997 mg/g,together with an expanded uncertainty of 3 mg/g(k=2).This high-purity thiacloprid can be applied to routine monitoring in agriculture and the food fields.

关键词： Mass balance Quantitative nuclear magnetic resonance spectroscopy Reference material Thiacloprid

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Constructing osteo-inductive bio-ink for 3D printing through hybridization of gelatin with maleic acid modified bacterial cellulose by regulating addition volumes of maleic acid solution

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Journal of Bioresources and Bioproducts 2024年第3期9卷 336-350页

作者： Xucai Wang Dengxian Wu Wei Liao Yaxuan Liu Wenhui Pei Jixian Wang Jiayu Gu Peng Wang Kai Lan Caoxing Huang Co-Innovation Center for Efficient Processing and Utilization of Forest Resources College of Chemical EngineeringNanjing Forestry UniversityNanjing 210037China state key laboratory of Pharmaceutical Biotechnology Department of Sports Medicine and Adult Reconstructive SurgeryNanjing Drum Tower Hospitalthe Affiliated Hospital of Nanjing University Medical SchoolNahanjing 210008China Children's Hospital of Nanjing Medical University Nanjing 210008China Jiangsu Institute of metrology Nanjing 210023China Department of Forest Biomaterials College of Natural ResourcesNorth Carolina State UniversityRaleigh NC 27695USA

Bacterial cellulose(BC)is an exopolysaccharide with unique properties that has been applied in various ***,the dense and intertwined nature of BC fibers limits its use in certain applications,including 3D printing scaffolds for bone *** this work,a controllable BC-based bio-ink for 3D printing was successfully prepared by modifying the neat BC through maleic acid(MA)treatment,aiming to promote bone tissue *** achieve homogeneous BC dispersions while preserving its crystalline and chemical properties,BC was modified by MA solution(60%,w/V)with solid-liquid ratio from 1꞉5 to 1꞉50(w/V)to obtain MA-BC *** analysis results from microstructure,chemical group,crystallinity,and wettability indicated that the BC/MA solution with ratio of 1꞉30 demonstrated the best pre-treatment performance to obtain ***,by combining MA-BC with gelatin,we successfully formulated MA-BC-GEL gels with favorable rheological properties and compression modulus,which can be used as promising bio-inks for 3D bioprinting *** vitro tests demonstrated 1꞉30 MA-BC possessed excellent biocompatibility,a significant ability to express the alkaline phosphatase gene and osteogenic-related genes,and facilitated the formation of mineralized *** utilization of this novel bio-ink in scaffold preparation for bone regeneration highlights the promising application of modified BC in bone tissue engineering field.

关键词： Bacterial cellulose Maleic acid Osteogenic activity Printability

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Heparin mimetics as potential intervention for COVID-19 and their bio-manufacturing

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Synthetic and Systems Biotechnology 2023年第1期8卷 11-19页

作者： Lan Jiang Tianji Zhang Hongzhong Lu Saijuan Li Kangjie Lv Alex Tuffour Lixin Zhang Kan Ding Jin-Ping Li Hongmei Li Xueting Liu Department of Cardiothoracic Surgery Children’s Hospital of Nanjing Medical UniversityNanjing210093China state key laboratory of Bioreactor Engineering East China University of Science and TechnologyShanghai200237China Division of Chemistry and Analytical Science Key Laboratory of Chemical Metrology and Applications on Nutrition and Health for State Market RegulationNational Institute of MetrologyBeijing100029China state key laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology Shanghai Jiao Tong UniversityShanghai200240China Glycochemistry&Glycobiology Lab Key Laboratory of Receptor ResearchShanghai Institute of Materia MedicaChinese Academy of SciencesShanghai201203China International Research Center for Soft Matter Beijing University of Chemical TechnologyBeijing100029China Department of Medical Biochemistry and Microbiology University of UppsalaUppsalaSweden

The COVID-19 pandemic has caused severe health problems worldwide and unprecedented decimation of the global ***,after more than 2 years,many populations are still under pressure of ***,a broader perspective in developing antiviral strategies is still of great *** by the observed multiple benefits of heparin in the treatment of thrombosis,the potential of low molecular weight heparin(LMWH)for the treatment of COVID-19 have been *** applications found that LMWH decreased the level of inflammatory cytokines in COVID-19 patients,accordingly reducing ***,several in vitro studies have demonstrated the important roles of heparan sulfate in SARS-CoV-2 infection and the inhibitory effects of heparin and heparin mimetics in viral *** clinical observations and designed studies argue for the potential to develop heparin mimetics as anti-SARS-CoV-2 drug *** this review,we summarize the properties of heparin as an anticoagulant and the pharmaceutical possibilities for the treatment of virus infection,focusing on the perspectives of developing heparin mimetics via chemical synthesis,chemoenzymatic synthesis,and bioengineered production by microbial cell *** ultimate goal is to pave the eminent need for exploring novel compounds to treat coronavirus infection-caused diseases.

关键词： Heparin Biosynthesis Biological activities Bio-production

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Mapping Cell Phenomics with Multiparametric Flow Cytometry Assays

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Phenomics 2022年第4期2卷 272-281页

作者： Yang Liu Haichu Zhao Boqiang Fu Shan Jiang Jing Wang Ying Wan Biomedical Analysis Center Army Medical UniversityChongqing 400038China Chongqing key laboratory of Cytomics Chongqing 400038China Institute for Advanced Study Shenzhen UniversityShenzhen 518055China National Institute of metrology Beijing 100029China

Phenomics explores the complex interactions among genes,epigenetics,symbiotic microorganisms,diet,and environmental exposure based on the physical,chemical,and biological characteristics of individuals and *** efficient and comprehensive phenotyping techniques have been integrated into modern phenomics-related *** flow cytometry technology provides more measurement parameters than conventional flow *** on detailed descriptions of cell phenotypes,rare cell populations and cell subsets can be distinguished,new cell phenotypes can be discovered,and cell apoptosis characteristics can be detected,which will expand the potential of cell phenomics *** on the enhancements in multicolor flow cytometry hardware,software,reagents,and method design,the present review summarizes the recent advances and applications of multicolor flow cytometry in cell phenomics,illuminating the potential of applying phenomics in future studies.

关键词： Cell phenomics Multiparametric cytometry Flow cytometry assay

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