Simultaneous Determination of Passivator and Antioxidant Additives in Insulating Mineral Oils by High-Performance Liquid Chromatography

Bruzzoniti, Maria Concetta; Maina, R.; Tumiatti, V.; Sarzanini, Corrado; Carlo, Rosa Maria De

doi:10.1080/10826076.2013.873875

Cited by 9 publications

(4 citation statements)

References 6 publications

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“…Cyclopentasiloxane, decamethyl- is classified as a cyclomethicone that is commonly used in cosmetics, such as deodorants, sunblock, hair sprays, and skin care products. It is also used as part of silicone-based personal lubricants [ 52 ], while phenol, 2,6-bis(1,1-dimethylethyl)-4-methyl is the phenolic antioxidant also known as 2,6-ditertiary-butyl paracresol (DBPC) or butylatedhydroxytoluene (BHT) [ 53 ].…”

Section: Discussionmentioning

confidence: 99%

The Antioxidant, Anti-Apoptotic, and Proliferative Potency of Argan Oil against Betamethasone-Induced Oxidative Renal Damage in Rats

Orabi

Allam

Shawky

et al. 2020

Biology

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The present study aimed to investigate the protective effect of argan oil (AO) against nephrotoxic effects following overdose and long-term administration of betamethasone (BM). The phytochemical compositions of AO were assessed using GC/MS. Forty eight male Wister albino rats were divided into six groups and treated for 3 successive weeks. The control group was orally administrated distilled water daily, the BM group received BM (1 mg/kg, IM, day after day), AO/0.5 and AO/1 groups received AO (0.5 mL/kg, 1 mL/kg, orally, daily, respectively), BM + AO/0.5 group and BM + AO/1 group. The results revealed that BM induced hematological changes, including reduction of red blood cells with leukocytosis, neutrophilia, monocytosis, lymphocytopenia, and thrombocytopenia. Moreover, BM caused a significant increase of serum urea and creatinine levels, and renal malondialdehyde and nitric oxide contents with significant decrease of reduced glutathione content. BM also caused vascular, degenerative, and inflammatory histopathological alterations in kidney, along with an increase in the Bax/Bcl-2 ratio, activation of caspase-3, and decrease of proliferating cell nuclear antigen expression. Conversely, the concomitant administration of AO (0.5, 1 mL/kg) with BM ameliorated the aforementioned hematological, biochemical, pathological, and histochemical BM adverse effects. In conclusion, AO has protective effects against BM-induced renal damage, possibly via its antioxidant, anti-apoptotic, and proliferative properties.

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Section: Discussionmentioning

confidence: 99%

The Antioxidant, Anti-Apoptotic, and Proliferative Potency of Argan Oil against Betamethasone-Induced Oxidative Renal Damage in Rats

Orabi

Allam

Shawky

et al. 2020

Biology

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“…Recoveries of the five additives spiked in in‐service oils were included within 95 and 98.5%. Coulometric detection furnished a great improvement in sensitivity for DBP and DBPC analysis , providing detection limits of tens mg/kg.…”

Section: Discussionmentioning

confidence: 99%

“…The lack of analytical methods able to determine antioxidants and passivators in a unique run was extensively discussed by Bruzzoniti et al [5], where we proposed and validated an SPE-HPLC-UV detection method for the simultaneous analysis of the five commonest additives found in insulating mineral oils (antioxidants: DBPC, DBP, NPN; passivators: BTA, Irgamet R 39), which provided apparent recoveries in the range 80-87% for BTA, Irgamet R 39 and NPN and 53 and 15% for DBP and DBPC, respectively.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous determination of five common additives in insulating mineral oils by high‐performance liquid chromatography with ultraviolet and coulometric detection

Bruzzoniti

Sarzanini

Rivoira

et al. 2016

J of Separation Science

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Dielectric mineral oils are used to impregnate power transformers and large electrical apparatus, acting as both liquid insulation and heat dissipation media. Antioxidants and passivators are frequently added to mineral oils to enhance oxidation stability and reduce the electrostatic charging tendency, respectively. Since existing standard test methods only allow analysis of individual additives, new approaches are needed for the detection of mixtures. For the first time we investigate and discuss the performance of analytical methods, which require or do not require extraction as sample pretreatment, for the simultaneous reversed-phase high-performance liquid chromatography determination of passivators (benzotriazole, Irgamet(®) 39) and antioxidants (N-phenyl-1-naphtylamine, 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-p-cresol), chosen for their presence in marketed oils. Quick easy, cheap, effective, rugged and safe and solid phase extractions were evaluated as sample pretreatments. Direct sample-injection was also studied. Ultraviolet spectrophotometry and direct-current coulometry detection were explored. As less prone to additive concentrations variability, the direct-injection high-performance liquid chromatography with ultraviolet and coulometric detection method was validated through comparison with Standard Method IEC 60666 and through an ASTM interlaboratory proficiency test. Obtained detection limits are (mg kg(-1) ): benzotriazole (2.8), Irgamet(®) 39 (13.8), N-phenyl-1-naphtylamine (11.9), 2,6-di-tert-butylphenol (13.1), 2,6-di-tert-butyl-p-cresol (10.2). Simultaneous determination of selected additives was possible both in unused and used oils, with good precision and accuracy.

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“…Due to the compounds’ polarity, low volatility and occurrence in low concentrations, the most commonly chosen techniques are LC for separation and MS for sensitive detection and identification. Occasionally, UV/VIS or fluorescence detection [ 32 , 36 ] have also been used, but noticeably higher limits of quantification (LOQ) have been achieved in those cases.…”

Section: Analytical Techniques For the Determination Of Polar Benzmentioning

confidence: 99%

Solid-Phase Extraction of Polar Benzotriazoles as Environmental Pollutants: A Review

Kraševec

Prosen

2018

Molecules

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Polar benzotriazoles are corrosion inhibitors with widespread use; they are environmentally characterized as emerging pollutants in the water system, where they are present in low concentrations. Various extraction methods have been used for their separation from various matrices, ranging from classical liquid–liquid extractions to various microextraction techniques, but the most frequently applied extraction technique remains the solid-phase extraction (SPE), which is the focus of this review. We present an overview of the methods, developed in the last decade, applied for the determination of benzotriazoles in aqueous and solid environmental samples. Several other matrices, such as human urine and plant material, are also considered in the text. The methods are reviewed according to the determined compounds, sample matrices, cartridges and eluents used, extraction recoveries and the achieved limits of quantification. A critical evaluation of the advantages and drawbacks of the published methods is given.

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Simultaneous Determination of Passivator and Antioxidant Additives in Insulating Mineral Oils by High-Performance Liquid Chromatography

Cited by 9 publications

References 6 publications

The Antioxidant, Anti-Apoptotic, and Proliferative Potency of Argan Oil against Betamethasone-Induced Oxidative Renal Damage in Rats

The Antioxidant, Anti-Apoptotic, and Proliferative Potency of Argan Oil against Betamethasone-Induced Oxidative Renal Damage in Rats

Simultaneous determination of five common additives in insulating mineral oils by high‐performance liquid chromatography with ultraviolet and coulometric detection

Solid-Phase Extraction of Polar Benzotriazoles as Environmental Pollutants: A Review

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