Optimization of petroleum acid isolation from lower oil fractions of Vojvodina "Velebit" oil

Cirin-Novta, S Vera; Kevresan, E Slavko; Kuhajda, N Ksenija; Kandrac, E Julijan; Radic, M Ljubica

doi:10.2298/apt0334049c

Cited by 11 publications

(7 citation statements)

References 2 publications

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“…13 Structural analyses of the isolated naphthenic acids were carried out using naphthenic acids or methyl esters. 13 Structural analyses of the isolated naphthenic acids were carried out using naphthenic acids or methyl esters.…”

Section: Isolation and Structural Analysis Of Naphthenic Acidsmentioning

confidence: 99%

Biochemical changes in cuttings of Robinia pseudoacacia after treatment with naphthenate

Slavko

Kovačević

Ćirin-Novta

et al. 2007

JSCS

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Naphthenic acids were isolated from gas oil fractions (distillation interval 168-290 qC) of Vojvodina crude oil "Velebit", characterized and their biological activity evaluated by the biochemical changes in cuttings of Robinia pseudoacacia after treatment with naphthenate. The activities of IAA peroxidase, total peroxidases and amylase, as well as the contents of reducing sugars and total proteins, were determined in the basal parts of soft wood cuttings of black locust after treatment with sodium naphthenate or the sodium salt of 1-naphthaleneacetic acid (NAA), concentration 10 -7 mol dm -3 for 3 or 6 h. High activities of IAA oxidase and amylase, together with a low activity of peroxidase (which is known as being stimulatory for the initiation and activation of primordia) were obtained after the three-hour treatment with sodium naphthenate. Six-hour treatment had an inhibitory effect on the examined biochemical markers. The effects of three-and six-hour treatments with NAA were between those of the corresponding treatment with naphthenic acids.

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Section: Isolation and Structural Analysis Of Naphthenic Acidsmentioning

confidence: 99%

Biochemical changes in cuttings of Robinia pseudoacacia after treatment with naphthenate

Slavko

Kovačević

Ćirin-Novta

et al. 2007

JSCS

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“…29 Further purification was performed by triple repeated alkaline extraction and drying with anhydrous Na 2 SO 4 . Naphthenic acids were isolated from an atmospheric oil fraction (distillation interval 168-290 °C) of Vojvodina crude oil "Velebit" by the optimized procedure of alkaline extraction.…”

Section: General Methodsmentioning

confidence: 99%

Fractionation of complex mixtures of naphthenic acids, their characterization and biological activity

Grbović

Pavlović

Prekodravac

et al. 2012

JSCS

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Naphthenic acids (NAs) are complex mixtures of cycloaliphatic and alkyl-substituted acyclic carboxylic acids whose overall characteristics are determined by the composition of the mixture. A complex mixture of NAs from a commercial fraction of atmospheric oil of the Vojvodina naphthenic crude "Velebit" (Serbia) was separated into narrower fractions on the basis of their acidity. Electrospray ionization mass spectrometry analysis of the fractions showed the occurrence of structural differentiation of acids. By extraction at pH 3-5, about 50% of the total mass of acids was separated, consisting predominantly of tricyclic and bicyclic structures. Acids of lower acidity, (about 22%), separated at pH 9 and 10, and their dominant constituents were acids with three, four and five rings. A correlation was found between the dominant structure and the biological activity of NAs of the fractions. The fraction extracted at pH 8, also with dominant bicyclic and tricyclic structures, showed the highest auxin and gibberellin activities

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“…Naphthenic acids were extracted from the atmospheric gas oil fraction (distillation interval 168-290ºC) of Vojvodina crude oil "Velebit" and characterized by IR spectroscopy, GC-MS analysis and other physicochemical methods [24]. The measured total acid number of the obtained preparation of purified naphthenic acids was 201 mg g -1 , which indicates a high level of purity, as the theoretical value is 214 mg g -1 .…”

Section: Naphthenic Acids and Potassium Naphthenatementioning

confidence: 99%

Foliar and root treatments of cucumber with potassium naphthenate: Antioxidative responses

et al. 2012

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This work presents a study of the effect of foliar and root application of low concentrations (0.1–10 µM) of potassium naphthenate on the antioxidative status of cucumber (Cucumis sativus L.), assessed for both local and systemic organs. Changes in the contents of proline and glutathione indicate that the treatment of plants with potassium naphthenate can be characterized as a mild abiotic stress. The antioxidative system of cucumber plants is sensitive to such treatment, since organs directly exposed to the chemical showed a decrease in total antioxidant activities and an increase in peroxidation. In the organs that were not directly treated, an increase in the total antioxidative activity was observed only at the lowest naphthenate concentration while at higher concentrations this activity tended to decrease. As far as the activities of antioxidant enzymes (guaiacol peroxidase, superoxide dismutase, catalase) are concerned, the responses observed differed between enzymes for a given treatment, but showed similar trends within treated local and untreated systemic organs.

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Optimization of petroleum acid isolation from lower oil fractions of Vojvodina "Velebit" oil

Cited by 11 publications

References 2 publications

Biochemical changes in cuttings of Robinia pseudoacacia after treatment with naphthenate

Biochemical changes in cuttings of Robinia pseudoacacia after treatment with naphthenate

Fractionation of complex mixtures of naphthenic acids, their characterization and biological activity

Foliar and root treatments of cucumber with potassium naphthenate: Antioxidative responses

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