This study aimed to investigate the gas chromatographic properties and mass spectrometric fragmentations of anabolic androgenic steroids (AASs) after trimethylsilylated derivatization. A total of 113 AASs were analyzed through gas chromatography-mass spectrometry in the full-scan mode. New fragmentation pathways yielding 129, 143 and 169 ions were analyzed. Based on the characteristics of the A-ring, seven classes of drugs were identified and analyzed. The fragmentation pathway of a new classification of 4-en-3-hydroxyl was reported for the first time. The relationship between the chemical structures of AASs and their retention time, along with their molecular ion peak abundance, was also reported herein for the first time.
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http://dx.doi.org/10.4155/bio-2023-0009 | DOI Listing |
Sci Rep
January 2025
LCEA Laboratory, Faculty of Sciences, Mohammed Premier University, Oujda, Morocco.
In the current investigation, the efficiency inhibition of two newly synthesized bi-pyrazole derivatives, namely 2,3-bis[(bis((1 H-pyrazol-1-yl) methyl) amino)] pyridine (Tetra-Pz-Ortho) and 1,4-bis[(bis((1 H-pyrazol-1-yl) methyl) amino)] benzene (Tetra-Pz-Para) for corrosion of carbon steel (C&S) in 1 M HCl medium was evaluated. A Comparative study of inhibitor effect of Tetra-Pz-Ortho and Tetra-Pz-Para was conducted first using weight loss method and EIS (Electrochemical Impedance Spectroscopy) and PDP (Potentiodynamic Polarisation) techniques. Tetra-Pz-Ortho and Tetra-Pz-Para had a maximum inhibition efficacy of 97.
View Article and Find Full Text PDFJ Oleo Sci
January 2025
Regeneration and Stem Cell Biology Lab, Centre for Molecular and Nanomedical Sciences, International Research Centre, Sathyabama Institute of Science and Technology.
Coelomic fluid of earthworms is a valuable source of novel bioactive compounds with therapeutic applications. To gain insight into the bioactive compounds in the coelomic fluid, this study used Perionyx excavatus, a tropical earthworm distinguished for its remarkable ability for regeneration. This study aimed to identify fluorescent bioactive compounds in the coelomic fluid of P.
View Article and Find Full Text PDFJ Biomater Appl
January 2025
BEST/CB3S, UMR CNRS 7244, Institut Galilée, Université Sorbonne Paris Nord, Villetaneuse, France.
Myelomeningocele (MMC) is a congenital defect of the spine characterized by meningeal and spinal cord protrusion through open vertebral archs, and its exposure to the amniotic fluid. Given that the progression of neuronal loss begins early in fetal life, an early coverage of the defect is required to improve the neurological outcomes. Several studies have proposed patches as an alternative to full surgical repair, to achieve an early protection of the spine and possibly reduce the rate of complications of current prenatal surgical procedures.
View Article and Find Full Text PDFInt J Biol Macromol
January 2025
State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Tianjin 300350, People's Republic of China. Electronic address:
A heteropolysaccharide, designated JYP70-1, was extracted and purified from the fruits of Rosa laevigata, exhibiting a molecular weight of 1.90 × 10 g/mol. Structural analysis revealed that JYP70-1 was composed of eleven sugar residues, including α-l-Araf-(1→, →3)-α-l-Araf-(1→, →5)-α-l-Araf-(1→, →3,5)-α-l-Araf-(1→, →2,5)-α-l-Araf-(1→, →4)-α-d-Galp-(1→, →6)-β-d-Galp-(1→, →6)-α-d-Glcp-(1→, α-d-Glcp-(1→, →2)-α-d-Manp-(1→, and →3,6)-β-d-Manp-(1→.
View Article and Find Full Text PDFInt J Biol Macromol
January 2025
School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China; State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, and MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi University, Nanning 530004, China; School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China. Electronic address:
Regenerated cellulose is extensively utilized as a natural polymer due to its actually natural piezoelectric properties as well as renewable properties, but suffers from processing difficulties and low piezoelectric constants (d). Consequently, this work focuses on controlling the molecular weight of regenerated cellulose through pretreatment methods that promote the growth of in situ ZnO to enhance its d. Firstly, the acid-catalyzed pulp fibers (PF) and zinc nitrate hexahydrate were added in NaOH/urea solvent to effectively prepare RC/ZnO composite film via regeneration and in-situ growth.
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