Nontargeted evaluation of the fate of steroids during wastewater treatment by comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry [PDF]
, 2016 Emerging organic contaminants in wastewater are usually analyzed by targeted approaches, and especially estrogens have been the focus of environmental research due to their high hormonal activity. The selection of specific target compounds means, however,
Kopperi, Matias +3 more
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Analytical methodologies for the determination of pharmaceuticals and personal care products (PPCPs) in sewage sludge: A critical review [PDF]
, 2019 Producción CientíficaSeveral analytical approaches have been developed for the determination of emerging pollutants (EPs), including pharmaceuticals and personal care products (PPCPs) in environmental matrices. This paper reviews the sample preparation
Barrado Esteban, Enrique +3 more
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Synthesis of 26-methyl cholestane and identification of cryostanes in mid- Neoproterozoic sediments [PDF]
, 2018 International audienceThe biomarker distributions of mid-Neoproterozoic sediments (800–717 million yr, Ma) from various locations are characterized by the occurrence, besides cholestane isomers, of a novel series of C28 steranes, whereas classical C-24 ...
Adam, Pierre +2 more
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Biological Marker Fingerprints of Crude Oils from Three Oilfields in the Central Niger Delta: Implication to Source Input, Conditions of Deposition, and Thermal Maturation [PDF]
, 2022 Crude oil samples recovered from three oilfields distributed within the central Niger Delta were used to investigate biological marker fingerprints, sources of organic matter, conditions of deposition, and thermal maturation.
Agbi, Ifeoma Ogeri +4 more
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Biomolecular analyses enable new insights into ancient Egyptian embalming [PDF]
, 2023 The ability of the ancient Egyptians to preserve the human body through embalming has not only fascinated people since antiquity, but also has always raised the question of how this outstanding chemical and ritual process was practically achieved.
Altmann-Wendling, V. +11 more
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Acta Crystallographica Section E Structure Reports Online, 2012 The asymmetric unit of the title compound, C27H45ClO, consists of two crystallographically independent molecules. In both molecules, the three cyclohexane rings in the steroid fused-ring systems adopt chair conformations, while the cyclopentane ring adopts a half-chair conformation in one molecule and an envelope conformation in the other.
Yusufzai, Samina Khan +4 more
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Tetra- and pentacyclic alkanes in the Cretaceous/Tertiary boundary sediments at Kawaruppu, Hokkaido, Japan [PDF]
, 2002 Twenty two steranes and 17 triterpanes were detected in the Cretaceous-Tertiary (K/T) boundary sediments at Kawaruppu, Hokkaido, Japan. These steranes and triterpanes were detected at a concentration level of 0.001-0.1nmol g-1.
Mita, Hajime +2 more
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Geochemical Investigation of Tar Balls Collected on a Beach on Žirje Island (Croatia) Using Petroleum Biomarkers [PDF]
, 2021 Tar balls are frequently reported as indicators of the extent of marine pollution owing to spill incidents of crude oil or petroleum products. Representative tar ball samples collected on a beach on Žirje Island, Croatia, were geochemically characterised
Cuculić, Vlado +2 more
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STEROIDS: PART IV. CONDENSATION OF CHOLESTAN-3-ONE AND CHOLESTANE-3,6-DIONE WITH FORMALDEHYDE [PDF]
Canadian Journal of Chemistry, 1960 Cholestan-3-one and cholestane-3,6-dione were allowed to react under the conditions of the Mannich reaction with paraformaldehyde and amine hydrochlorides. The products obtained proved to be methylene-bis-ketones, and were formulated as di(2,2′-3-oxocholestanyl)methane and di(4,4′-3,6-dioxocholestanyl)methane respectively.
Ted H. Waid, Alfred Taurins
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GeoresursyThe paper discusses the peculiarities of group, molecular and elemental compositions of bitumens and oils of Usolskaya and Teter Formations of three fields of the central part of Nepsko-Botuobinskaya oil and gas bearing area.
E. A. Vtorushina +6 more
doaj +1 more source