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Academic literature on the topic 'Pregnа-5'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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Journal articles on the topic "Pregnа-5"

1

О., В. Булавенко, В. Фурман О., А. Таран О., and Л. Льовкіна О. "A MODERN OBSTETRICIAN-GYNECOLOGISTS' VIEW ON THE MULTIVITAMIN COMPLEXES FOR PREGNANT WOMEN." REPRODUCTIVE ENDOCRINOLOGY, no. 47 (June 30, 2019): 64–67. https://doi.org/10.18370/2309-4117.2019.47.64-67.

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During pregnancy, especially in the second and third trimesters, the need of pregnant woman's body for plastic and biologically active substances, which are later used to build the fetus organs and systems, significantly increases. The lack of certain vitamins, minerals and trace elements during pregnancy negatively affects the health of women and fetus, thereby increasing the risk of perinatal pathology and infant mortality, as well as the frequency of prematurity, congenital malformations, disorders of physical and mental child development. Milk secretion during lactation also contribute

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2

Gonzalez, Mario D., and Gerardo Burton. "On the Elimination of the 3-Benzylthioenol Ether of Pregn-4-ene-3,20-dione by W-2 Raney Nickel." Zeitschrift für Naturforschung B 40, no. 5 (1985): 639–44. http://dx.doi.org/10.1515/znb-1985-0513.

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Reaction of 3-benzylthiopregna-3,5-dien-20-one or of pregna-3,5-dien-20-one with W-2 Raney nickel in acetone afforded a mixture of 20-ketopregnanes with different degrees of insaturation on rings A and B, of which the main component was identified as pregn-2-en-20-one. When deactivated Raney nickel was used, the main product was the expected pregna-3,5-dien-20-one with minor amounts of pregn-4-en-20-one and pregn-5-en-20-one.

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3

Polman, Jiří, та Alexander Kasal. "Synthesis of 5-methyl-19-nor-5β-pregn-9-ene derivatives". Collection of Czechoslovak Chemical Communications 55, № 7 (1990): 1783–91. http://dx.doi.org/10.1135/cccc19901783.

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3β,5,6β-Trihydroxy-5α-pregnan-20-one 3-pivalate (I) was converted into 3β,6β-dihydroxy-5-methyl-19-nor-5β-pregn-9-en-20-one 3-pivalate 5-acetate (II) under conditions of Westphalen rearrangement. Deoxygenation in the position 6β was effected by treatment of the corresponding 6β-thiobenzoate or thioimidazolide with tributyltin hydride. Progesterone analogues XII and XIII, prepared from the 6-deoxy compound IX, exhibit abortive activity.

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4

Chodounská, Hana, та Alexander Kasal. "Epalons: Synthesis of 3α,7α-Dihydroxy-5α-pregnan-20-one". Collection of Czechoslovak Chemical Communications 63, № 10 (1998): 1543–48. http://dx.doi.org/10.1135/cccc19981543.

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3α,7α-Dihydroxy-5α-pregnan-20-one (12) was prepared from (20R)-pregn-5-ene-3β,20-diyl 3-acetate 20-benzoate (1). ∆5-Olefin was oxidized in an allylic position and hydrogenated. Inversion of a configuration at carbon C-3 was carried out by solvolysis in N,N-dimethylformamide of 3β-tosylate in the presence of sodium nitrite. For stereoselective reduction of the 7-oxo group, L-Selectride® was used.

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5

Scott, A. P., A. V. M. Canario, Nancy M. Sherwood та Carol M. Warby. "Levels of steroids, including cortisol and 17α,20β-dihydroxy-4-pregnen-3-one, in plasma, seminal fluid, and urine of Pacific herring (Clupea hareng us pallasi) and North Sea plaice (Pleuronectes platessa L.)". Canadian Journal of Zoology 69, № 1 (1991): 111–16. http://dx.doi.org/10.1139/z91-016.

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In an accompanying paper we report that herring milt contains high concentrations of conjugated cortisol and 17α,20β-dihydroxy-4-pregnen-3-one. We suggest that one source of these steroids was the urine, which could have become mixed with the milt during the hand-stripping procedure. In the present study, samples of hand-stripped milt from several other species, plaice (Pleuronectes platessa), dab (Limanda limanda), flounder (Platichthys flesus), goldfish (Carassius auratus), and rainbow trout (Oncorhynchus mykiss, formerly Salmo gairdneri), were assayed for free and conjugated cortisol. Uncon

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6

Grandgirard, André, Stéphanie Cabaret, Lucy Martine, and Olivier Berdeaux. "New Internal Standard for Quantitative Determination of Oxyphytosterols by Gas Chromatography." Journal of AOAC INTERNATIONAL 87, no. 2 (2004): 481–84. http://dx.doi.org/10.1093/jaoac/87.2.481.

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Abstract A study was conducted to develop a new internal standard for the quantitative determination of oxyphytosterols. Tests on 5α-androsten-3β,17β-diol; 5α-androstan-3β, 17β-diol; 5-pregnen-3β,20α-diol; and 5α-pregnan-3β,20β-diolshowed that these compounds were not fully adequate. However, the compound 3β,22-dihydroxy-20-homo-5-pregnene, synthesized in 4 steps, resulted in a promising internal standard, with a molecule similar to hydroxysterols; retention time as trimethylsilyl in gas chromatography comprised between 5α-cholestane and 7α-hydroxycholesterol; clear mass spectrum in electronic

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7

Choudhary, Muhammad I., Syed G. Musharraf, Rahat A. Ali, Muhammad Atif та Atta-ur Rahman. "Microbial Transformation of Antifertility Agents, Norethisterone and 17α-Ethynylestradiol". Zeitschrift für Naturforschung B 59, № 3 (2004): 319–23. http://dx.doi.org/10.1515/znb-2004-0314.

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The microbial transformation of oral contraceptive norethisterone (1) by Cephalosporium aphidicola afforded an oxidized metabolite, 17α-ethynylestradiol (2), while the microbial transformation of 2 by Cunninghamella elegans yielded several metabolites, 19-nor-17α-pregna-1,3,5 (10)- trien-20-yne-3,4,17β -triol (3), 19-nor-17α-pregna-1,3,5 (10)-trien-20-yne-3,7α,17β -triol (4), 19- nor-17α-pregna-1,3,5 (10)-trien-20-yne-3,11α,17β -triol (5), 19-nor-17α-pregna-1,3,5 (10)-trien-20- yne-3,6β ,17β -triol (6) and 19-nor-17α-pregna-1,3,5 (10)-trien-20-yne-3,17β -diol-6β -methoxy (7). Metabolite 7 was

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8

Yousuf, S., S. G. Musharraf, N. Iqbal, A. Adhikari та M. I. Choudhary. "3α-Dimethylamino-20-(N-methylacetamido)pregn-5-ene". Acta Crystallographica Section E Structure Reports Online 67, № 11 (2011): o2918. http://dx.doi.org/10.1107/s160053681103964x.

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9

Oliver, James E., та William R. Lusby. "Glucosylations of pregn-5-ene-3β,20R-diol". Steroids 52, № 3 (1988): 265–78. http://dx.doi.org/10.1016/0039-128x(88)90008-6.

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10

Nahar, Lutfun, Satyajit D. Sarker, and Alan B. Turner. "Synthesis of Pregnenolone and Methyl Lithocholate Oxalate Derivatives." Natural Product Communications 3, no. 1 (2008): 1934578X0800300. http://dx.doi.org/10.1177/1934578x0800300106.

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Five new steroidal oxalate derivatives, oxalic acid (pregn-5-en-20-one)-3β-yl ethyl ester (2), oxalic acid mono (pregn-5-en-20-one)-3β-yl ester (3), chloro-oxo-acetic acid (5β-cholan-24-oic acid methyl ester)-3α-yl ester (5), oxalic acid mono (5β-cholan-24-oic acid methyl ester)-3α-yl ester (6) and oxalic acid (5β-cholan-24-oic acid methyl ester)-3α-yl ethyl ester (7) were synthesized, respectively, from pregnenolone (1) and methyl lithocholate (4) using excess oxalyl chloride.

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Books on the topic "Pregnа-5"

1

Jarczok, Terese. Radioimmunologische Bestimmung von 5[alpha]-Pregnan-3,20-dion [Alpha-Pregnan-dion] und Progesteron im Fruchtwasser bei normalen und pathologischen Schwangerschaften. [s.n.], 1986.

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2

Liebert, Peter. Untersuchungen zur In-vitro-Bindung von 3[alpha]-Hydroxy-5[alpha]-pregnan-20-on und dessen Schwefelsäureester an subzelluläre Fraktionen aus Hirn- und Lebergewebe von Ratten. 1992.

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Book chapters on the topic "Pregnа-5"

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Vasantha, S., A. Subramaniyan, S. V. Bakiya Lakshmi, P. Vanathi, and C. Karpaga Sundari. "COMPARATIVE ANALYSIS OF BIOACTIVE COMPOUNDS IN DRY BLACK AND GREEN GRAPES VITIS VINIFERA (L.) BY GC-MS." In Futuristic Trends in Agriculture Engineering & Food Sciences Volume 3 Book 10. Iterative International Publisher, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3bcag10p1ch5.

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The study indented to examine the therapeutic potentials of V. vinifera through GC/MS characterization. The ethanolic extracts of Black and Green dry grapes were undergone qualitative analysis. The consequences of qualitative phytochemical analysis of black and green grapes extracts confirmed the occurrence of alkaloids, flavonoids, glycosides, saponins, tannins, carbohydrates, phytosterol, and triterpenoids, whereas flavonoids were absent in green grapes. The black dry grape possessed Antioxidant, hypocholesterolemic, Antiandrogenic, hemolytic, Alpha reductase inhibitor, Anti-inflammatory, An

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Conference papers on the topic "Pregnа-5"

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Bilan, Dmitri, Sergiu Cojocari, Vsevolod Pogrebnoi, Natalia Sucman, and Fliur Macaev. "The opening of dehydropregnenolone epoxide leading to the non-saturated skeletal rearrangement product." In Scientific seminar with international participation "New frontiers in natural product chemistry". Institute of Chemistry, Republic of Moldova, 2023. http://dx.doi.org/10.19261/nfnpc.2023.ab23.

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This report presents a compound that emerges as a product of the skeletal rearrangement following the opening of dehydropregnenolone epoxide (Figure 1). The opening of the epoxy cycle in dehydropregnenolone epoxide 1 in the presence of hydrochloric acid leads to the formation of two chromatographically inseparable diastereomers 2 and 3 (Figure 1).Figure 1. Scheme of the formation of diastereomers 2 and 3 In the literature, there is an example of the epoxide opening in absolute methanol. Thus, according to Girdhar et al [1], the reaction of compound 1 with dry HCl in dry MeOH at low temperature

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Reports on the topic "Pregnа-5"

1

ภู่ทอง, ทรงจันทร์, อุมาพร พิมพิทักษ์, กิตตินันท์ โกมลภิส, อณุมาศ บัวเขียว та พลกฤษ์ แสงวณิช. การพัฒนาชุดตรวจวิเคราะห์โพรเจสเทอโรนในน้ำนมโคด้วยวิธีเอนไซม์ลิงค์อิมมิวโนซอร์เบนด์แอสเสย์ : รายงานการวิจัย. จุฬาลงกรณ์มหาวิทยาลัย, 2011. https://doi.org/10.58837/chula.res.2011.120.

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โพรเจสเทอโรนเป็นสเตอรอยด์ฮอร์โมน (C21 steroid, pregn-4-ene-3, 20 dione) ซึ่งถูกผลิตและหลั่งมาอยู่ในน้าเลือดและน้านมโดยคอร์ปัสลูเทียมหลังจากการตกไข่ระหว่างวงรอบการเป็นสัด เป็นที่ทราบกันว่าระดับความเข้มข้นของโพรเจสเทอโรนสามารถใช้ระบุการเข้าสู่วงรอบการเป็นสัดและการตั้งครรภ์ของโคได้โดยมีความถูกต้องอยู่ที่ 75 – 96% ดังนั้นวิธีการตรวจหาทางระบบภูมิคุ้มกันจึงได้รับการพัฒนาและนาไปใช้ในการตรวจหาระดับฮอร์โมนโพรเจสเทอโรน โดยการใช้เทคนิค enzyme-linked immunosorbent assay (ELISA) ซึ่งถือว่าเป็น หนึ่งในวิธีการที่เหมาะสมที่สุด เนื่องจากให้ ความไวสูง สามารถทาได้ง่าย และมีความจาเพาะสูง ในการศึกษานี้ได้พัฒนาชุดต

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