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Ansari MD, Sagir H, Yadav VB, Yadav N, Verma A, Shakya S, Singh M, Siddiqui IR. Magnetically recoverable Fe 3O 4 nanocatalyst for the synthesis of biodynamically significant 1H-pyrazolo[1,2-b]phthalazine-5,10-diones derivatives and its DFT study. Mol Divers 2023; 27:1853-1866. [PMID: 36207499 DOI: 10.1007/s11030-022-10532-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Accepted: 09/15/2022] [Indexed: 11/29/2022]
Abstract
An environmentally sustainable and proficient method is reported for the synthesis of medicinally important pyrazolo[1,2-b] phthalazine dione derivatives by aqueous micellar medium catalysed by Fe3O4 NPs. Dialkyl acetylenedicarboxylate with isocyanides in the presence of phthalhydrazide is used as starting material. The main advantages of this protocol are the availability of starting materials, short reaction times, green solvents and practical simplicity.
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Affiliation(s)
- Mohd Danish Ansari
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Allahabad, 211002, India
| | - Hozeyfa Sagir
- Department of Chemistry, Paliwal P.G. College, Shikohabad, 205135, India
| | - Vijay B Yadav
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Allahabad, 211002, India
| | - Neetu Yadav
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Allahabad, 211002, India
| | - Ankit Verma
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Allahabad, 211002, India
| | - Sonam Shakya
- Department of Chemistry, Aligarh Muslim University, Aligarh, India
| | - Manjit Singh
- Department of Chemistry, IIT BHU, Varanasi, India
| | - I R Siddiqui
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Allahabad, 211002, India.
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2
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Al-Romaizan AN, Gangwar MK, Verma A, Bawaked SM, Saleh TS, Al-Ammari RH, Butcher RJ, Siddiqui IR, Mostafa MMM. Catalytic Acceptorless Dehydrogenation (CAD) of Secondary Benzylic Alcohols into Value-Added Ketones Using Pd(II)-NHC Complexes. Molecules 2023; 28:4992. [PMID: 37446653 PMCID: PMC10343575 DOI: 10.3390/molecules28134992] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 06/22/2023] [Accepted: 06/23/2023] [Indexed: 07/15/2023] Open
Abstract
For the creation of adaptable carbonyl compounds in organic synthesis, the oxidation of alcohols is a crucial step. As a sustainable alternative to the harmful traditional oxidation processes, transition-metal catalysts have recently attracted a lot of interest in acceptorless dehydrogenation reactions of alcohols. Here, using well-defined, air-stable palladium(II)-NHC catalysts (A-F), we demonstrate an effective method for the catalytic acceptorless dehydrogenation (CAD) reaction of secondary benzylic alcohols to produce the corresponding ketones and molecular hydrogen (H2). Catalytic acceptorless dehydrogenation (CAD) has been successfully used to convert a variety of alcohols, including electron-rich/electron-poor aromatic secondary alcohols, heteroaromatic secondary alcohols, and aliphatic cyclic alcohols, into their corresponding value-added ketones while only releasing molecular hydrogen as a byproduct.
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Affiliation(s)
- Abeer Nasser Al-Romaizan
- Department of Chemistry, Faculty of Science, King Abdul-Aziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (A.N.A.-R.); (S.M.B.); (R.H.A.-A.)
| | - Manoj Kumar Gangwar
- Department of Chemistry, Faculty of Science, University of Allahabad (AoU), Prayagraj 211002, Uttar Pradesh, India; (M.K.G.); (A.V.); (I.R.S.)
| | - Ankit Verma
- Department of Chemistry, Faculty of Science, University of Allahabad (AoU), Prayagraj 211002, Uttar Pradesh, India; (M.K.G.); (A.V.); (I.R.S.)
| | - Salem M. Bawaked
- Department of Chemistry, Faculty of Science, King Abdul-Aziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (A.N.A.-R.); (S.M.B.); (R.H.A.-A.)
| | - Tamer S. Saleh
- Department of Chemistry, College of Science, University of Jeddah, P.O. Box 80327, Jeddah 21959, Saudi Arabia
| | - Rahmah H. Al-Ammari
- Department of Chemistry, Faculty of Science, King Abdul-Aziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (A.N.A.-R.); (S.M.B.); (R.H.A.-A.)
| | - Ray J. Butcher
- Department of Chemistry, Howard University, Washington, DC 20059, USA;
| | - Ibadur Rahman Siddiqui
- Department of Chemistry, Faculty of Science, University of Allahabad (AoU), Prayagraj 211002, Uttar Pradesh, India; (M.K.G.); (A.V.); (I.R.S.)
| | - Mohamed Mokhtar M. Mostafa
- Department of Chemistry, Faculty of Science, King Abdul-Aziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (A.N.A.-R.); (S.M.B.); (R.H.A.-A.)
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Tiwari SK, Nazeef M, Verma A, Kumar A, Yadav V, Yadav N, Ansari S, Siddiqui IR. BF 3-etherate promoted facile access to vinyloxyimidazopyridines: a metal-free sustainable approach. Mol Divers 2021; 26:1259-1266. [PMID: 33993439 DOI: 10.1007/s11030-021-10228-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 04/27/2021] [Indexed: 01/31/2023]
Abstract
A convenient and metal-free synthesis of vinyloxyimidazopyridine derivatives has been attained via BF3.OEt2 promoted one-pot multicomponent approach. This procedure involves a facile coupling of 2-aminopyridine derivatives with arylglyoxal and alkyne derivatives. BF3.OEt2 complexation has successfully catalyzed the reaction at room temperature. Utilization of transition metal-free catalyst, mild reaction conditions, easy handling and operational simplicity are key features of developed process.
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Affiliation(s)
- Saurabh Kumar Tiwari
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Prayagraj, 211002, India
| | - Mohd Nazeef
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Prayagraj, 211002, India
| | - Ankit Verma
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Prayagraj, 211002, India
| | - Ankit Kumar
- Department of Chemistry, University of Delhi, New Delhi, India
| | - Vikas Yadav
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Prayagraj, 211002, India
| | - Neetu Yadav
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Prayagraj, 211002, India
| | - Saif Ansari
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Prayagraj, 211002, India
| | - I R Siddiqui
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Prayagraj, 211002, India.
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Singh M, Yadav VB, Ansari MD, Malviya M, Siddiqui IR. Efficient one-pot synthesis of substituted diphenyl 1, 3-thiazole through multicomponent reaction by using green and efficient Iron-catalyst via Cross-Dehydrogenative Coupling(CDC). Mol Divers 2021; 26:843-848. [PMID: 33559099 DOI: 10.1007/s11030-021-10191-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2020] [Accepted: 01/23/2021] [Indexed: 10/22/2022]
Abstract
A clean and efficient, multi-component strategy for the synthesis of biologically important trisubstituted thiazole via the reaction of readily available barbituric acid, acetophenone, and aryl thioamides is reported in the presence of FeCl3.6H2O / O2(Air) in DMF solvent. The advantages of the present methodology include a one-pot reaction, environment-friendly approach, cost-effectiveness, broad substrate scope, operational simplicity, short reaction time, easy workup procedure, and high yields.
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Affiliation(s)
- Manjit Singh
- Department of Chemistry IIT BHU, Varanasi, India
| | - Vijay B Yadav
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Prayagraj, 211001, India
| | - Mohd Danish Ansari
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Prayagraj, 211001, India
| | | | - I R Siddiqui
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Prayagraj, 211001, India.
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Yadav N, Ansari MD, Yadav VB, Verma A, Tiwari SK, Ansari S, Siddiqui IR. Metal-free visible-light-mediated organophotoredox catalysis: synthesis of 3-functionalized indole via C-C, C-N bond formation. Mol Divers 2020; 25:1103-1109. [PMID: 32016772 DOI: 10.1007/s11030-020-10044-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 01/22/2020] [Indexed: 11/25/2022]
Abstract
A visible-light-mediated, mild and one-pot three-component reaction in the presence of organophotoredox catalyst Eosin Y using EtOH:H2O as reaction medium for the synthesis of 3-functionalized indole derivatives was developed. Visible light used in the protocol is green, inexpensive, readily available energy source. The sustainable reagents make the protocol compatible with green chemistry demands.
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Affiliation(s)
- Neetu Yadav
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Allahabad, 211002, India
| | - Mohd Danish Ansari
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Allahabad, 211002, India
| | - Vijay B Yadav
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Allahabad, 211002, India
| | - Ankit Verma
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Allahabad, 211002, India
| | - Saurabh K Tiwari
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Allahabad, 211002, India
| | - Saif Ansari
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Allahabad, 211002, India
| | - I R Siddiqui
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad, Allahabad, 211002, India.
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6
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Srivastava A, Siddiqui IR. Novel ionic liquid–mediated approach for the synthesis of tetracyclic[6,5,5,5]indole ring. J Heterocycl Chem 2020. [DOI: 10.1002/jhet.3738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
| | - Ibadur Rahman Siddiqui
- Laboratory of Green SynthesisDepartment of Chemistry, University of Allahabad Prayagraj India
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Shivhare KN, Srivastava A, Siddiqui IR. Catalyst-Free Glycerol Promoted Green Synthesis of 2-amino-1,8- naphthyridine -3-carbonitriles and 2-amino-3-quinolinecarbonitriles. CGC 2019. [DOI: 10.2174/2452273203666190114145322] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We describe herein the use of glycerol as an efficient and sustainable approach for the synthesis
of 2-amino-1, 8-naphthyridine-3-carbonitriles and 2-amino-3-quinolinecarbonitriles. The catalyst-
free reactions occur straightforwardly using biodegradable and non-hazardous solvent. It is a
strategy to address mounting environmental concerns with current approach includes the use of environmentally
benign solvent, simple workup procedure, economic viability, shorter reaction time and
providing good to excellent yield.
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Affiliation(s)
- Km Neha Shivhare
- Department of Chemistry, Laboratory of Green Synthesis, University of Allahabad, Allahabad-211002, India
| | - Anushree Srivastava
- Department of Chemistry, Laboratory of Green Synthesis, University of Allahabad, Allahabad-211002, India
| | - Ibadur Rahman Siddiqui
- Department of Chemistry, Laboratory of Green Synthesis, University of Allahabad, Allahabad-211002, India
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Ansari MD, Sagir H, Yadav VB, Yadav N, Siddiqui IR. Synthesis of Benzo[b]furan Derivatives via S
8
‐Nano particles/β‐cyclodextrin: An Environmentally Friendly Approach. ChemistrySelect 2018. [DOI: 10.1002/slct.201800589] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Mohd Danish Ansari
- Laboratory of Green SynthesisDepartment of ChemistryUniversity of Allahabad Allahabad-211002 India
| | - Hozeyfa Sagir
- Laboratory of Green SynthesisDepartment of ChemistryUniversity of Allahabad Allahabad-211002 India
| | - Vijay B. Yadav
- Laboratory of Green SynthesisDepartment of ChemistryUniversity of Allahabad Allahabad-211002 India
| | - Neetu Yadav
- Laboratory of Green SynthesisDepartment of ChemistryUniversity of Allahabad Allahabad-211002 India
| | - I R Siddiqui
- Laboratory of Green SynthesisDepartment of ChemistryUniversity of Allahabad Allahabad-211002 India
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Kumar P, Kushwaha P, Ahmad N, Maurya SW, Dev K, Khedgikar V, Siddiqui IR, Trivedi R, Maurya R. Design and synthesis of dalbergin analogues and evaluation of anti-osteoporotic activity. Bioorg Med Chem Lett 2017; 27:1765-1775. [DOI: 10.1016/j.bmcl.2017.02.062] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2016] [Revised: 02/08/2017] [Accepted: 02/24/2017] [Indexed: 01/13/2023]
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Maurya SW, Dev K, Singh KB, Rai R, Siddiqui IR, Singh D, Maurya R. Synthesis and biological evaluation of heterocyclic analogues of pregnenolone as novel anti-osteoporotic agents. Bioorg Med Chem Lett 2017; 27:1390-1396. [DOI: 10.1016/j.bmcl.2017.02.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Revised: 01/25/2017] [Accepted: 02/02/2017] [Indexed: 11/16/2022]
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Dev K, Ramakrishna E, Maurya SW, Siddiqui IR, Kant R, Maurya R. Ugi three-component reaction of alcohols, amines and isocyanides: A new approach to the synthesis of cyclic amidines. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.02.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Ramakrishna E, Dev K, Maurya SW, Siddiqui IR, Maurya R. Hypervalent iodine (III)-mediated oxidation of aryl sulfonylhydrazones: A facile synthesis of N-aroyl-N′-acyl arylsulfonylhydrazides. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2016.12.085] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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Choudhary D, Kushwaha P, Gautam J, Kumar P, Verma A, Kumar A, Maurya SW, Siddiqui IR, Mishra PR, Maurya R, Trivedi R. Fast and long acting neoflavonoids dalbergin isolated from Dalbergia sissoo heartwood is osteoprotective in ovariectomized model of osteoporosis: Osteoprotective effect of Dalbergin. Biomed Pharmacother 2016; 83:942-957. [DOI: 10.1016/j.biopha.2016.08.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2016] [Revised: 07/29/2016] [Accepted: 08/05/2016] [Indexed: 12/26/2022] Open
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Singh S, Sharma LK, Saraswat A, Siddiqui IR, Singh RKP. Electrochemical behaviour of aldehyde-N-arylhydrazones at platinum electrode and their characterization. RUSS J ELECTROCHEM+ 2014. [DOI: 10.1134/s1023193514090092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Siddiqui IR, Yadav S, Shamim S, Shireen, Waseem MA, Srivastava A, Srivastava A. Solid-Supported Cyclocondensation of Arylglyoxal on Ribosylthiourea under Microwave Activation: A Novel and Efficient Synthesis of N-Glycosylated-2-thiohydantoins. BCSJ 2014. [DOI: 10.1246/bcsj.20130138] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
| | - Sanjay Yadav
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad
| | - Shayna Shamim
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad
| | - Shireen
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad
| | - Malik A. Waseem
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad
| | - Arjita Srivastava
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad
| | - Anjali Srivastava
- Laboratory of Green Synthesis, Department of Chemistry, University of Allahabad
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Siddiqui IR, Shamim S, Singh A, Srivastava V, Yadav S. Moisture compatible and recyclable indium (III) chloride catalyzed and microwave assisted efficient route to substituted 1H-quinolin-2-ones. ARKIVOC 2010. [DOI: 10.3998/ark.5550190.0011.b19] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Hidiroglou M, Williams CJ, Siddiqui IR, Khan SU. Effects of Mn-deficit feeding to ewes on certain amino acids and sugars in cartilage of their newborn lambs. Am J Vet Res 1979; 40:1375-7. [PMID: 525856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The distribution of amino acid, amino sugar, and uronic acid in the epiphyseal cartilage of newborn lambs were examined to determine the influence of manganese (Mn) deficiency. Throughout the gestational period, one group (group I) of eight pregnant ewes was given a ration containing 60 mg of Mn/kg of feed and a second group (group II) of eight ewes was given a ration containing 5 mg of Mn/kg of feed. The neonatal lambs were killed, and the epiphyseal plates from various bones in the thoracic limb were removed and analyzed for glucosamine, galactosamine, uronic acid, and 17 amino acids. Concentrations of uronic acid and of the sulphur amino acids (methionine not significant, P greater than 0.05) were larger in the cartilage from the lambs born of group I ewes (60 mg of Mn/kg of ration) than in the cartilage from those of the Group II ewes (Mn deficiency). A tendency for higher hexosamine values was observed in the organic matrix of the group I lambs than of the group II lambs. However, concentrations of serine, histidine, and lysine were higher in the cartilage from group II lambs (Mn deficiency). Thus, the role of Mn in the prevention of joint abnormalities may be its influence on the mucopolysaccharide and protein composition of the epiphyseal plate.
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Schneider EF, Barran LR, Wood PJ, Siddiqui IR. Cell wall of Fusarium sulphureum. II. Chemical composition of the conidial and chlamydospore walls. Can J Microbiol 1977; 23:763-9. [PMID: 871973 DOI: 10.1139/m77-113] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Examination of the conidial and chlamydospore walls of Fusarium sulphureum by electron microscopy showed the presence of two distinct layers of differing electron densities. These include a relatively narrow outer electron-dense layer and a broader more transparent inner layer. Both chlamydospore cell wall layers were thicker than the conidial wall. The outer wall of the chlamydospore wall was 30% thicker while the inner cell wall layer was 250% thicker than the corresponding cell wall layers in the conidia. During conidial differentiation to form chlamydospores there was a considerable augmentation of all cell wall components which varied from 7 to 26-fold per cell. The augmentation of the major cell wall constituents (N-acetylglucoseamine (NAG), glucose, and protein) and the vast increase in the inner cell wall of the chlamydospore wall indicated that these newly synthesized constituents are predominently located in the inner cell wall layer.The major carbohydrate constituents on a dry weight basis in both the conidial and chlamydospore walls were glucose, glucuronic acid, and N-acetylglycosamine (NAG). However, the proportion of these and the other carbohydrate constituents were different for both spore walls. Thus, the conidial wall contained about 50% less NAG and glucuronic acid but twice the glucose content of the chlamydospore wall. Protein was a major component of both spore walls (21.6%, conidial wall; 28.5%, chlamydospore wall). Amino acid analysis indicated differences in the types of protein present in the two spore walls. The lipid content of both conidia and chlamydospore was low (1–2%).
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Pfeilsticker K, Siddiqui IR. [Isolation of the Derivatives from Coca-Powder Fumigated by Ethylene Oxide 1,2-14 C and their Structure Suggested on the Basis of I. R. and Mass-Spectrometry]. Z Lebensm Unters Forsch 1976; 160:19-27. [PMID: 961063 DOI: 10.1007/bf01252669] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
In Coca-powder fumigated with Ethylene Oxide-1,2(14)C, several derivatives were isolated by extraction and preparative Thin Layer Chromatography. Of the two compounds isolated from the water-extract, the structures have been suggested as N,N-Bis-(Di-Ethoxy-O-Hydroxy-ethyl)-Isoleucyl-Alanyl-Cysteine (MW = 569)and N-Ethoxy-O-Hydroxyethyl)-Tyrosine (MW = 269), based on I.R. and Mass Spectrometry. Their approximate concentrations were found to be 20 and 50 mg/kg respectively.
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Pfeilsticker K, Siddiqui IR. [Group separation of ethylene oxide 1,2-14c fumigated coca-powder derivatives and their distribution of radioactivity (author's transl)]. Z Lebensm Unters Forsch 1975; 158:157-61. [PMID: 1189616 DOI: 10.1007/bf01147256] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A procedure based on extraction, column chromatography and precipitation is described for the separation of ethylene oxide-1,2-14C fumigated coca-powder derivatives in 9 different groups. As it was found in wheat [1], the major portion of radioactivity lies in water extract; in coca-powder the major portion of radioactivity is also found in low molecular components.
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Siddiqui IR, Wood PJ. Structural investigation of water-soluble rapeseed (Brassica campestris) polysaccharides. II. An acidic arabinogalactan. Carbohydr Res 1972; 24:1-9. [PMID: 4343240 DOI: 10.1016/s0008-6215(00)82254-5] [Citation(s) in RCA: 38] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Wood PJ, Siddiqui IR. Determination of methanol and its application to measurement of pectin ester content and pectin methyl esterase activity. Anal Biochem 1971; 39:418-28. [PMID: 4995341 DOI: 10.1016/0003-2697(71)90432-5] [Citation(s) in RCA: 201] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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