Papers 10,000
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#1Ikuo Ueta (University of Yamanashi)H-Index: 16
#2Taiga Komatsu (University of Yamanashi)
Last. Yoshihiro Saito (TUT: Toyohashi University of Technology)H-Index: 30
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An analytical method using a porous polytetrafluoroethylene (PTFE) membrane that passes through gas while repelling water, and a needle-type extraction device was developed for purge-and-trap (PT) extraction followed by gas chromatography–mass spectrometric (GC–MS) determination of volatile organic compounds (VOCs) in water samples. The PTFE membrane was fixed in a solid-phase extraction glass cartridge, and 10 mL of water sample and sodium chloride were added. Then, a needle-type extraction dev...
#1Nurul Aryani Zulkipli (UMT: Universiti Malaysia Terengganu)
#2Wan Mohd Afiq Wan Mohd Khalik (UMT: Universiti Malaysia Terengganu)H-Index: 6
Last. Saw Hong Loh (UMT: Universiti Malaysia Terengganu)H-Index: 12
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Non-biodegradable plastics are an unresolved issue in solid waste management as recycling them is expensive. This study focused on formulating a biodegradable gellan gum (GG) membrane embedded with multiwalled carbon nanotubes (MWCNTs) as the adsorbent in the micro-solid phase extraction (µ-SPE) of selected polycyclic aromatic hydrocarbons (PAHs), i.e. phenanthrene, fluoranthene, pyrene and benzo[a]pyrene, in environmental water and fruit-juice beverage samples. PAHs quantitation was performed u...
#1Zixin Zhang (TUTCM: Tianjin University of Traditional Chinese Medicine)H-Index: 2
#2Zhida Wang (TMU: Tianjin Medical University)
Last. Fei Tian (TUTCM: Tianjin University of Traditional Chinese Medicine)
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We present a facile approach for the direct attachment of cross-linked poly(2-thiopheneacetic acid) onto the surface of magnetite nanoparticles with one single carbon layer (Fe3O4@1C NPs) via self-assembly oxidative polymerization. The functional Fe3O4@1C NPs combined with poly(2-thiopheneacetic acid) [Fe3O4@1C@ poly(Th) NPs] was successfully prepared and used for magnetic solid-phase extraction (MSPE). The influence of the preparation conditions and extraction conditions were investigated in de...
An analysis strategy that can simultaneously determine the amino acid site information and configuration for polymyxin (PM) components is reported in this study. The main components of PMB1, PMB2, and PMB1-I (the Leucine at position 7 changed to be Isoleucine) were purified from the mixture of PMB. The PMB component was hydrolyzed by hydrochloric acid to be a mixture of amino acids, which were derivatized with Marfey’s reagent of Nα-(5-fluoro-2,4-dinitrophenyl)-l-alanine amide (l-FDAA), and then...
#1Muhammed Alzweiri (UJ: University of Jordan)H-Index: 6
#2Tamam Al-Helo (UJ: University of Jordan)
Antagonism of carbonic anhydrase, isozyme 3 (CAIII) has a strong potential in treating obesity, hyperlipidemia and cancer. The enzyme has a very low activity in hydrating carbon dioxide which makes it unresponsive to the majority of methods used against other CAs. In this study, a new evaluation method based on gas chromatography (GC) is considered for the screening of the inhibitory activity of various nicotinic acid derivatives against CAIII using immobilized pH-sensitive matrix pellets. The C...
#1Abderrazaq Hamdache (USTHB: University of Sciences and Technology Houari Boumediene)
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A reverse phase-high-performance liquid chromatography-diode array detector method is developed for the determination of the antiviral drug sofosbuvir in bulk and Sofos® 400 mg tablet dosage forms. Sofosbuvir is used for the treatment of chronic hepatitis C. The separation is carried out using a gradient mobile phase consisting of 0.05% H3PO4 and acetonitrile. A symmetry C18 column (4.6 × 100 mm, 2.5 µm, Waters XSELECT HSS T3) is used with a flow rate of 1.5 mL min−1 using ultraviolet detection ...
#1Guo-Ying Chen (CQU: Chongqing University)H-Index: 4
#2Hao Zhang (CQU: Chongqing University)H-Index: 8
Last. Yuanjia Hu (UM: University of Macau)H-Index: 23
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In this study, an online capillary electrophoresis-based immobilized enzyme microreactor (CE-IMER) was developed for evaluating inhibitory activity of small-molecule compounds and tea polyphenol extracts on kallikrein (KLK). KLK was immobilized on the inner wall at the inlet of capillary to prepare the KLK-IMER with the aid of chitosan and glutaraldehyde. The immobilized KLK activity and other kinetic parameters were evaluated by measuring the peak area of hydrolysate of chromogenic substrate S-...
#1Muhammad Imran Malik (KU: University of Karachi)H-Index: 18
Liquid chromatography at critical conditions is one of the major chromatographic techniques for characterization of complex polymers beyond mere total molar mass. In this perspective, different approaches of analyses using critical conditions are elaborated. Strengths, opportunities, and caveats associated with different LCCC approaches are discussed. Finally, the future challenges and opportunities are highlighted.
#1Lining Yin (NU: Nanjing University)H-Index: 2
#2Yuye Huang (NU: Nanjing University)H-Index: 1
Last. Jinhui Wu (NU: Nanjing University)H-Index: 30
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A novel, simple and stability indicating reverse-phase high performance liquid chromatographic method with UV detection at 220 nm (RP-HPLC-UV) was established to realize the simultaneous analysis of carbetocin and ten related impurities. This paper performed the most comprehensive impurity profiling of carbetocin, including the synthesis-related impurities, the isomers of carbetocin and the degradants formed from the forced degradation research, the structures of which were tentatively identifie...
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