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determination of phenolic antioxidant dbpc and dbp

Agilent 5500, 4500, and Cary 630 FTIR Spectrometers Determination of Phenolic Antioxidant DBPC and DBP Levels in Electrical Insulating Oil Agilent 5500, 4500, and Cary 630 FTIR Spectrometers Authors Dipak Mainali and Frank Higgins Agilent T

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Agilent 5500, 4500, and Cary 630 FTIR Spectrometers

Determination of Phenolic Antioxidant DBPC and DBP Levels in Electrical Insulating Oil Agilent 5500, 4500, and Cary 630 FTIR Spectrometers Authors Dipak Mainali and Frank Higgins Agilent Technologies, Inc. Application Note Introduction The phenolic antioxidants 2,6-ditertiary-butyl paracresol (DBPC) (also known as

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[PDF] Determination of Phenolic Antioxidant DBPC and DBP ...

The phenolic antioxidants 2,6-ditertiary-butyl paracresol (DBPC) (also known as butylated hydroxytoluene (BHT)) and 2,6-ditertiary-butyl phenol (DBP) are the two most common oxidation inhibitors added to the electrical insulating (transformer) oil and mineral oil based lubricants. The typical recommended value of DBPC and DBP in fresh electrical insulating oil is approximately 0.3% by weight.

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determination of phenolic antioxidant dbpc and dbp levels ...

Determination of Phenolic Antioxidant DBPC and DBP Levels in Electrical Insulating Oil Agilent 5500, 4500, and Cary 630 FTIR Spectrometers Application Note Authors Introduction Dipak Mainali and Frank Higgins The phenolic antioxidants 2,6-ditert . Get Price; Determination of DBPC and DBP in Transformer Insulating Oil According to ASTM

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Determination of Phenolic Antioxidant DBPC and DBP Levels ...

The phenolic antioxidants 2,6-ditertiary-butyl paracresol (DBPC) (also known as butylated hydroxytoluene (BHT)) and 2,6-ditertiary-butyl phenol (DBP) are the two most common oxidation inhibitors added to the electrical insulating (transformer) oil and mineral oil based lubricants.

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Determination of Phenolic Antioxidant DBPC and DBP

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Table 1 from Determination of Phenolic Antioxidant DBPC ...

Table 1. Predicted Versus Actual Values for the Calibration Data Set Using the ASTM 2668 Method - "Determination of Phenolic Antioxidant DBPC and DBP Levels in Electrical Insulating Oil Agilent 5500 , 4500 , and Cary 630 FTIR Spectrometers"

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Determination of DBPC and DBP in Transformer Insulating ...

Determination of DBPC and DBP in Transformer Insulating Oil According to ASTM D2668 and IEC 60666 Figure 1. Chemical structures of antioxidants DBPC (left ) and DBP (right). 2 Experimental Uninhibited transformer insulating oil meeting the ... note that the ASTM and IEC methods for determination of phenolic antioxidants in insulating oils allow ...

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Determination of Antioxidant Capacity, Phenolic Acids, and ...

Three different analytical methods: ferric-reducing antioxidant power (FRAP), 2,2′-diphenyl-1-picrylhydrazyl (DPPH), and oxygen radical absorbance capacity (ORAC) were used for determination of antioxidant capacity of seven rapeseed varieties. Antioxidant capacity and levels of the total phenolic content, individual phenolic acids, fatty acid composition, and the selected physicochemical ...

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Determination of antioxidant activity and phenolic ...

Summary Antioxidant activity in Muntingia calabura Linn. peel was evaluated by DPPH radical, ORAC, ABTS cation radical, FRAP assays and total phenolic contents by different extraction conditions. I...

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Determination of the Contents of Antioxidants and Their ...

The infusion bag is mainly made up of polyolefin polymer. Antioxidants are usually added to these polymer materials in the production process to prevent the materials from aging and enhance the stability of the materials. Because of the potential harm of antioxidants to human body, it is necessary to limit the amount of antioxidants migrating to the pharmaceutical solutions.

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Determination of Phenolic Compounds and Antioxidant ...

Twenty-six different wild blackberry leaf samples were harvested from various localities throughout southeastern Poland. Leaf samples were assessed regarding their phenolic compound profiles and contents by LC/MS QTOF, and their antioxidant activity by ABTS and FRAP. Thirty-three phenolic compounds were detected (15 flavonols, 13 hydroxycinnamic acids, three ellagic acid derivatives and two ...

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DETERMINATION OF ANTIOXIDANT CONTENT IN INSULATING OILS

Quantitative assays of DBPC & DBP additives are performed on the basis of IR absorption spectrum with 3,650 cm1 maximum wavenumber that matches oscillating frequency of (О-Н)-bounds of phenolic compounds. To identify the type of antioxidant in the oil tested 860 cm-1 absorption lines are used for DBPC and 750 cm-1 absorption lines for DBP.

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测定酚类抗氧化剂 DBPC 和 DBP 的含量-安捷伦科技(中国 ...

测定酚类抗氧化剂 DBPC 和 DBP 的含量. The phenolic antioxidants 2,6-ditertiary-butyl paracresol (DBPC) (also known as butylated hydroxytoluene (BHT)) and 2,6-ditertiary-butyl phenol (DBP) are the two most common oxidation inhibitors added to the electrical insulating (transformer) oil and mineral oil based lubricants. The typical ...

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Determination of Phenolic Compounds and the Antioxidant ...

(2018). Determination of Phenolic Compounds and the Antioxidant Capacity of Ximenia parviflora Benth. var. parviflora (Olacaceae) Fruit by High-Performance Liquid Chromatography with Diode Array Detection. Analytical Letters: Vol. 51, No. 13, pp. 1986-1998.

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Determination of Antioxidant Capacity, Phenolic Acids, and ...

Three different analytical methods: ferric-reducing antioxidant power (FRAP), 2,2′-diphenyl-1-picrylhydrazyl (DPPH), and oxygen radical absorbance capacity (ORAC) were used for determination of antioxidant capacity of seven rapeseed varieties. Antioxidant capacity and levels of the total phenolic content, individual phenolic acids, fatty acid composition, and the selected physicochemical ...

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Determination of antioxidant activity and phenolic ...

Summary Antioxidant activity in Muntingia calabura Linn. peel was evaluated by DPPH radical, ORAC, ABTS cation radical, FRAP assays and total phenolic contents by different extraction conditions. I...

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Spectrophotometric Determination of Phenolic Antioxidants ...

Development of easy, practical, and low-cost spectrophotometric methods is required for the selective determination of phenolic antioxidants in the presence of other similar substances. As electron transfer (ET)-based total antioxidant capacity (TAC) assays generally measure the reducing ability of …

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Determination of synthetic phenolic antioxidants and their ...

Determination of synthetic phenolic antioxidants and their metabolites in water samples by downscaled solid-phase extraction, silylation and gas chromatography-mass spectrometry J Chromatogr A . 2010 Oct 8;1217(41):6428-35. doi: 10.1016/j.chroma.2010.08.020.

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Determination of DBPC and DBP in Transformer Insulating ...

Determination of DBPC and DBP in Transformer Insulating Oil According to ASTM D2668 and IEC 60666 Introduction Transformer insulating oil is often exposed to high temperatures due to the high voltage electrical applications for which it is commonly used.

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Corrosion control by antioxidant DBPC in insulating oil

Using this technique, antioxidant 2,6-di-tert-butyl-p-cresol (DBPC) was found to be effective to suppress corrosion caused by dibenzyl disulfide (DBDS). The effect of corrosion prevention ...

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Determination of Phenolic Compounds and Antioxidant ...

Twenty-six different wild blackberry leaf samples were harvested from various localities throughout southeastern Poland. Leaf samples were assessed regarding their phenolic compound profiles and contents by LC/MS QTOF, and their antioxidant activity by ABTS and FRAP. Thirty-three phenolic compounds were detected (15 flavonols, 13 hydroxycinnamic acids, three ellagic acid derivatives and two ...

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Foods | Free Full-Text | Determination of Phenolic ...

The effects of dry processing and maturity on antioxidant activity, total phenolic content, total procyanidins, and identity of phenolic compounds in coffee leaves were evaluated. Fresh coffee leaves were tray-dried at 40 °C for 8 h before total phenolic content, total procyanidins, and antioxidant activity were analyzed. The drying process significantly (p < 0.05) improved the release ...

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Determination of Antioxidant Capacity, Phenolic Acids, and ...

Three different analytical methods: ferric-reducing antioxidant power (FRAP), 2,2′-diphenyl-1-picrylhydrazyl (DPPH), and oxygen radical absorbance capacity (ORAC) were used for determination of antioxidant capacity of seven rapeseed varieties. Antioxidant capacity and levels of the total phenolic content, individual phenolic acids, fatty acid composition, and the selected physicochemical ...

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Determination of antioxidant activity and phenolic ...

Summary Antioxidant activity in Muntingia calabura Linn. peel was evaluated by DPPH radical, ORAC, ABTS cation radical, FRAP assays and total phenolic contents by different extraction conditions. I...

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Determination of phenolic compounds and antioxidant ...

490 Rev. Bras. Pl. Med., Campinas, v.16, n.3, p.490-498, 2014. Recebido para publicação em 02/09/2013 Aceito para publicação em 07/03/2014 Determination of phenolic compounds and antioxidant activity of green, black and

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Determination of Phenolic Compounds and the Antioxidant ...

(2018). Determination of Phenolic Compounds and the Antioxidant Capacity of Ximenia parviflora Benth. var. parviflora (Olacaceae) Fruit by High-Performance Liquid Chromatography with Diode Array Detection. Analytical Letters: Vol. 51, No. 13, pp. 1986-1998.

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Spectrophotometric Determination of Phenolic Antioxidants ...

Development of easy, practical, and low-cost spectrophotometric methods is required for the selective determination of phenolic antioxidants in the presence of other similar substances. As electron transfer (ET)-based total antioxidant capacity (TAC) assays generally measure the reducing ability of …

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Determination of total phenolic compounds, antioxidant ...

Determination of total phenolic compounds, antioxidant activity and nutrients in Brazil nuts (Bertholletia excelsa H. B. K.) Selvin Antonio Saravia Maldonado1*, Ismael Montero Fernández2, Ricardo Santos Alemán3, Jhunior Abrahan Marcia Fuentes4 and María da Conceição Campelo Ferreira5

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Determination of synthetic phenolic antioxidants and their ...

Determination of synthetic phenolic antioxidants and their metabolites in water samples by downscaled solid-phase extraction, silylation and gas chromatography-mass spectrometry J Chromatogr A . 2010 Oct 8;1217(41):6428-35. doi: 10.1016/j.chroma.2010.08.020.

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Edition 4.0 2012-02 INTERNATIONAL STANDARD NORME ...

antioxidant additive s of the phenolic -or amine- type, such as DBPC and DBP described in IEC 60666 Note 1 to entry DBPC = 2,6-di-tert-butyl -para-cresol; DBP = 2,6-di-tert-butyl -phenol . 3.5.2 other antioxidant additive antioxidant additive of the sulphur- or phosphorous- type 3.5.3 passivator

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