Synthesis and characteristics of ethylenediamine-N,N'-di-S-α-isovalerate and isomers of its cobalt(III) complexes

1982 ◽  
Vol 47 (1) ◽  
pp. 210-216 ◽  
Author(s):  
Milan Strašák ◽  
František Bachratý ◽  
Jaroslav Majer
Keyword(s):  
Amino Acids ◽  
Absolute Configuration ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Chemical Parameters ◽  
Methyl Group ◽  
Nmr Data ◽  
Physico Chemical ◽  
Natural Amino Acids ◽  
C Nmr

The synthesis and physico-chemical parameters are described of a new complexone based on natural amino acids, viz. ethylenediamine-N,N'-di-S-α-isovalerate (SS-EDDIV). 1H- and 13C-NMR data revealed that the methyl group in the substance are not equivalent. The isomers of the cobalt(III) complex with the asymmetric tetradentate SS-EDDIV ligand were prepared and separated; their characteristics are given. The absolute configuration of two of the five theoretically feasible isomers was determined based on their electronic absorption spectra and circular dichroism data.

Standard manufacturing process of Lekhana Putapaka

2017 ◽  
Vol 2 (1) ◽  
Author(s):  
Rejoice N. Macwan ◽  
Vaishnav P. U. ◽  
L. B. Singh ◽  
B. L. Umrethiya ◽  
B. D. Kalasariya
Keyword(s):  
Amino Acids ◽  
Specific Gravity ◽  
Blood Vessels ◽  
Manufacturing Process ◽  
Solid Content ◽  
Burning Sensation ◽  
Wild Animals ◽  
Chemical Parameters ◽  
Eye Disorders ◽  
Physico Chemical

Putapaka is one of the best local and effective applications for the treatment of eye disorders. Putapaka when used properly then it will treat burning sensation, inflammation, pain, feeling of friction, discharges, itching sensation, stickiness, muddy secretions and congestion of blood vessels. In classics there are three types of Putapaka are described Snehana Putapaka, Lekhana Putapaka and Ropana Putapaka. Lekhana Putapaka is prepared mainly with the help of Lekhana Dravyas. It is used for scrapping of the Doshas. Lekhana Putapaka is composed of the liver and flesh of wild animals with the drugs of Lekhana group and Lauha Bhasma, Tamra Bhasma, Shankha Bhasma, Saindhava, Samudrafena, Kasisa, Srotanjana and Dadhi Mastu. In this study, the ingredients for Lekhana Putapaka has been taken as per the reference of Sushruta Samhita but prepared by some modification (in pressure cooker). The yield of three batches of Putapaka was 85ml, 90ml and 100 ml respectively. The physico-chemical parameters like pH, specific gravity and solid content and phytochemical parameters like glycocides, saponin, tannin, steroids, amino acids, proteins etc has been carried out.

Exciton and electron interaction in covalently-linked dimeric porphyrins

1978 ◽  
Vol 56 (12) ◽  
pp. 1712-1715 ◽  
Author(s):  
John B. Paine III ◽  
David Dolphin ◽  
Martin Gouterman
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Nmr Spectra ◽  
Electronic Absorption Spectra ◽  
Electron Interaction ◽  
Covalently Linked ◽  
C Nmr

The interactions between dimeric porphyrins, covalently linked at their peripheries, have been measured from their electronic absorption spectra and 13C nmr spectra.

Preparation and Crystal Structure of Bis(tert-butyltetramethylcyclopentadienyl)dichlorotitanium

2005 ◽  
Vol 70 (10) ◽  
pp. 1589-1603 ◽  
Author(s):  
Lenka Lukešová ◽  
Róbert Gyepes ◽  
Jiří Pinkas ◽  
Michal Horáček ◽  
Jiří Kubišta ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Isomer Mixture ◽  
Sandwich Complex ◽  
Considerable Decrease ◽  
Methyl Group ◽  
Hydrolytic Product ◽  
Butyl Group ◽  
Half Sandwich

[TiCl2(η5-C5Me4t-Bu)2] (1) was prepared by the reaction of [TiCl3(thf)3] with 2 equivalents of Li(η5-C5Me4t-Bu) (made by adding BuLi to a 1.33 molar excess of a mixture of tert-butyltetramethylcyclopentadiene isomers in THF) and subsequent oxidation of the Ti(III) intermediate to 1 by adding aqueous HCl. Neglecting the presence of cyclopentadiene isomers not forming the cyclopentadienide anion in the isomer mixture used for the synthesis of 1 resulted in the formation of hydrolytic product [{TiCl2(η5-C5Me4t-Bu)}2(μ-O)] (2) and a considerable decrease of yield of 1. The half sandwich complex [TiCl3(η5-C5Me4t-Bu)] (3) was obtained by synproportionation of 1 and TiCl4. Crystal structures of 1, 2, and 3 were determined. The electronic absorption spectra of 1 and 3 indicate a stronger electron-donor effect of tert-butyl group compared with methyl group.

scholarly journals ESTADO DE DETERIORAÇÃO DOS MÉIS DE ABELHA (APIS MELLIFERA) COMERCIALIZADOS EM SÃO LUÍS DO MARANHÃO

2013 ◽  
Vol 20 (1) ◽  
pp. 64
Author(s):  
Marly Azevedo Saraiva ◽  
Gilberth Silva Nunes ◽  
Ivone Garros Rosa ◽  
José Malheiros Silva ◽  
Carlene Reis Peixoto ◽  
...  
Keyword(s):  
Amino Acids ◽  
Apis Mellifera ◽  
Physicochemical Properties ◽  
Nutritional Value ◽  
Chemical Analyses ◽  
Chemical Parameters ◽  
Physico Chemical ◽  
Intense Light ◽  
Complex Carbohydrates

O mel é um alimento muito apreciado e de excelente valor nutritivo, constituído por uma mistura complexa de carboidratos, enzimas, aminoácidos, ácidos, minerais, substâncias aromáticas, vitaminas, pigmentos, cera e grãos de pólen. O produto pode apresentar alterações devido a formas inadequadas de armazenamento e conservação. Tais procedimentos ocasionam sua deterioração, comprometendo seriamente o alimento. Quando os méis de abelha são submetidos a condições de temperatura e luminosidade intensa podem sofrer algumas modificações nas suas propriedades físico-químicas. A proposta deste trabalho é verificar a presença e o grau de deterioração dos méis de abelha comercializados em São Luís do Maranhão. Foram realizadas as análises físico-químicas: umidade, acidez, atividade diastásica e hidroximetilfurfural em 30 amostras de méis de Apis mellifera e os valores foram analisados segundo a Instrução Normativa n.º 11 de 2000 do MAPA. As amostras em estudo apresentaram valores fora dos padrões estabelecidos pela legislação, em relação à determinação de atividade diastásica e teor de hidroximetilfurfural, parâmetros físico-químicos que fornecem indicações sobre o grau de conservação e superaquecimento, o que indica que as amostras apresentaram deterioração.Palavras-chave: Mel. Apis mellifera. Deterioração.STATE OF DETERIORATION OF BEE'S HONEYS (APIS MELLIFERA) COMMERCIALIZED IN SÃO LUIS- MARANHÃOAbstract: Honey is a very appreciated food and has excellent nutritional value, constituted by a mixture of a complex carbohydrates, enzymes, amino acids, minerals, flavorings, vitamins, pigments, waxes and pollen. The product may undergo changes due to inadequate forms of storage and conservation. These procedures may cause their deterioration, severely compromising the food. When the honeys of bee are submitted to conditions of temperature and intense light may undergo some modifications in their physicochemical properties. The purpose of this study is to verify the presence and degree of deterioration of honeys of bee commercialized in São Luis do Maranhão. Physico-chemical analyses were done: moisture, acidity, diastase activity and hydroxymethylfurfural in 30 honey samples of Apis mellifera and the values were analyzed according to Normative Instruction No. 11 of 2000 of MAPA. The samples studied showed values outside the standards established by legislation in relation to the determination of diastase activity and hydroxymethylfurfural content, physico-chemical parameters that provide indications about the degree of conservation and overheating, which indicates that the samples showed deterioration.Keywords: Honey. Apis mellifera. Deterioration.ESTADO DE DETERIORO DEL MIEL DE ABEJA (APIS MELLIFERA) SE COMERCIALICEN EN SAO LUIS DO MARANHÃOResumen: La miel es un alimento muy popular y el valor nutritivo excelente, compuesto de una mezcla de hidratos de carbono complejos, enzimas, aminoácidos, minerales, vitaminas, aromatizantes, colorantes, ceras y polen. El producto puede sufrir cambios debido a métodos inadecuados de almacenamiento y conservación. Estos procedimientos causan su deterioro, comprometiendo severamente los alimentos Cuando las abejas están sujetas a condiciones de temperatura y luz intensa pueden sufrir algunas modificaciones en sus propiedades fisicoquímicas. El objetivo de el presente estudio es verificar la presencia y el grado de deterioro de la miel de abeja negocian en São Luís do Maranhão. Los análisis se realizaron con propiedades físicoquímicas: La humedad, acidez, actividad de la diastasa y el hidroximetilfurfural en 30 muestras de miel de Apis mellifera y los valores fueron analizados de acuerdo a la Instrucción Normativa N º 11 de 2000 MAPA. Las muestras estudiadas mostraron valores fuera de los estándares establecidos por la legislación en relación con la determinación de la actividad de la diastasa y el contenido de hidroximetilfurfural, parámetros físico-químicos que proporcionan información sobre el grado de conservación y el sobrecalentamiento, lo que indica que las muestras mostraron deterioro.Palabras clave: Mel. Apis mellifera. Deterioro.

scholarly journals Configurational Study of Diastereoisomeric Royleanone Diterpenoids From Salvia concolor

2019 ◽  
Vol 14 (7) ◽  
pp. 1934578X1986265
Author(s):  
Mónica Díaz-Fernández ◽  
María I. Salazar ◽  
Pedro Joseph-Nathan ◽  
Eleuterio Burgueño-Tapia
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Shift ◽  
Absolute Configuration ◽  
Vibrational Circular Dichroism ◽  
Chemical Shift Assignments ◽  
Aerial Parts ◽  
Nmr Data ◽  
Nmr Chemical Shift Assignments ◽  
C Nmr

The known diterpenoids horminone (1) and taxoquinone (2) as a mixture, and pure 6,7-dehydroroyleanone (7) were isolated from the aerial parts of not yet studied Salvia concolor Lamb. Although 1 and 2 are known, the 1H Nuclear Magnetic Resonance (NMR) data of their acetyl derivatives 4 to 6 are only partially described. Moreover, the 13C NMR data assignments for 4 and 6 show some inconsistencies and reveal better agreement with those we obtained for diastereoisomeric 3 and 5. Since stereochemical aspects were in doubt, it was considered as mandatory to unambiguously determine the absolute configuration of 3 to 6 using vibrational circular dichroism spectroscopy, which then allowed the complete 1H and 13C NMR chemical shift assignments of 4 to 6.

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