Determining economical TBHQ doses for corn oil stability

Oliveira, Janaina T. de Sá B. de G.; Regitano-D’Arce, Marisa Aparecida Bismara

doi:10.1590/s0101-20612004000300020

Cited by 11 publications

(9 citation statements)

References 7 publications

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“…Uma dose econômica pode ser estabelecida em concordância com a necessidade dos produtos e a competitividade econômica de mercado. 53 Assim sendo, este antioxidante pode ser considerado uma boa opção para retardar os processos oxidativos de biodiesel de óleo de girassol.…”

Section: Figura 2 Absorção Específica No Uv a 232 Nm Para O Biodieseunclassified

Avaliação da estabilidade oxidativa de biodiesel de óleo de girassol com antioxidantes

Ferrari¹,

Souza²

2009

Quím. Nova

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Recebido em 30/1/08; aceito em 15/7/08; publicado na web em 5/12/08 EVALUATION OF OXIDATION STABILITY OF SUNFLOWER OIL BIODIESEL WITH ANTIOXIDANTS. Biodiesel can contain unsaturated fatty acids, which are susceptible to oxidation, being able to change into polymerized compounds. In this work biodiesel was characterized according to physical-chemistry parameters and the antioxidant activity of butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT) and tert-butylhydroquinone (TBHQ) added to biofuel was analyzed. Biodiesel was submitted to accelerate oxidation in the Schaal oven test, and peroxide value was analyzed.The absorptivity values at 232 nm and 270 nm and oxidative stability in Rancimat ® were determined. It was observed that TBHQ presented superior antioxidant activity than BHT and BHA. Keywords: energy; peroxidation; lipid oxidation. introdUçãoDentre os complexos com grandes potenciais de crescimento está inserido aquele relacionado com a exploração do girassol. Isso porque, a priori, pode-se inferir que no Brasil a produção, o processamento e o consumo da oleaginosa, bem como dos seus principais derivados (óleo e farelo) estão muito abaixo do potencial.1 O girassol é uma cultura que apresenta características desejáveis sob o ponto de vista agronômico, como ciclo curto, elevada qualidade e bom rendimento em óleo, 2 que fazem dela uma boa opção aos produtores brasileiros.Os desafios que o girassol enfrenta no Brasil são basicamente três: oferecer aos produtores uma cultura alternativa que, em caráter complementar, possibilite uma segunda colheita, sobre a mesma área e mesmo ano agrícola; oferecer mais uma matéria-prima oleaginosa às indústrias de processamento de outros grãos, reduzindo sua ociosidade e, finalmente, oferecer ao mercado um óleo comestível de alto valor nutritivo.3 Junta-se a esses desafios a alternativa atual da produção de energia, já que o óleo de girassol pode ser utilizado como matéria-prima para produção de biodiesel. 1 O biodiesel não polui o meio ambiente e também traz vantagens econômicas, pois sua produção e o cultivo de matérias-primas contribuirão para a criação de milhares de novos empregos na agricultura familiar, principalmente nas regiões mais pobres do Brasil. 4 Biodiesel pode ser obtido de fontes renováveis, como óleos vegetais, através de processo de transesterificação, 5,6 no qual ocorre a conversão de triglicerídeos em ésteres de ácidos graxos.7 A maior parte do biodiesel produzido no mundo deriva dos óleos de soja e canola, 8 porém, segundo Parente, 9 todos os óleos vegetais podem ser transformados em biodiesel. Dentre estes, o óleo de girassol destaca-se por suas excelentes características físico-químicas, cuja produção da oleaginosa está entre as maiores culturas do mundo, 10 apresentando viabilidade técnico-ambiental na produção de biocombustíveis. 11O perfil de ácidos graxos dos óleos e gorduras favorece o desenvolvimento da rancidez oxidativa devido à quantidade de ácidos graxos insaturados, principalmente os ácidos oléico (C18:1), linoléico (C18:2) e l...

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Section: Figura 2 Absorção Específica No Uv a 232 Nm Para O Biodieseunclassified

Avaliação da estabilidade oxidativa de biodiesel de óleo de girassol com antioxidantes

Ferrari¹,

Souza²

2009

Quím. Nova

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“…Studies have suggested that, during storage, lipids are hydrolyzed by lipases in free fatty acids and glycerol, decreasing pH, primarily when temperature and water content are high, a favorable condition found in this experiment (Kirk 1984, Araújo 2004, Oliveira & Arce 2004). This change is accelerated by fungal development, due to the high lipolytic activity in these microorganisms (Athié et al 1998).…”

Section: Resultsmentioning

confidence: 54%

Total alcoholic acidity and pH tests as quality parameters in stored soybean grains

Araujo

Caneppele

Bianchini

2016

Pesqui. Agropecu. Trop.

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Despite the technology available to agriculture, qualitative and quantitative losses occurring during post-harvest are still not controlled, and stored grains may undergo changes in their composition, due to storage conditions. This study aimed at determining the sensitivity of the alcoholic acidity and pH tests in soybean (GB 874RR cultivar) grains with different quality standards obtained during storage. A completely randomized design, in a 3 x 6 x 5 (3 storage conditions x 6 storage times x 5 methods) factorial scheme, was used. A correlation was observed among pH, total acidity content (r = 0.888) and grain quality parameters. Deterioration was identified based on the total acidity content, showing a high correlation with fungal incidence (r = 0.864), ether extract (r = -0.781) and electrical conductivity (r = 0.923). The use of phenolphthalein as indicator is more sensitive than pH 8.8. Among the pH determination methods, AOAC was the most suitable for assessing the quality loss during storage.

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“…Thus, it is possible to consider the preservative influence in microorganisms' metabolism. The TBHQ preservative is commonly used in commercial vegetable oils at certain concentrations in order to keep its original properties after production by inhibit oxidation of some soy oil radicals (21).…”

Section: Discussionmentioning

confidence: 99%

Accumulated and weekly CO2 production by lubricant and soy oil biodegradation in aqueous media by aerobic respirometry

Lopes¹,

Montagnolli²,

Bidóia³

2011

Estud Biol.

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Petroleum activities have caused great concern due to the impact of major contamination it and its composites havecaused to nature, mainly to aquatic environments. Among the physical, chemical and biological methods available toremediate wastewater contaminated with hydrocarbons bioremediation is considered an environment-friendly and relativelycost-effective technology. That is due to the biodegradation the process is based on, using microbial populationsin the contaminated environment remediation. The objective of this study was to assess biodegradation in contaminatedaqueous media contamined by automotive lubricant oils and vegetable oils using respirometry technique. The Bartha andPramer’s respirometric method promotes CO2 quantification in the respirometers. The used lubricant oil had higher CO2production and the used vegetable oil was more biodegradable than the still unused vegetable oil. However, these vegetableoils were less biodegraded due to the presence of TBHQ preservative in their composition, thus causing a reductionin CO2 production. Thus, an environmental behavior analysis of lubricant and vegetable oils is important to provide newstrategies in treating contaminated environments.

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Determining economical TBHQ doses for corn oil stability

Cited by 11 publications

References 7 publications

Avaliação da estabilidade oxidativa de biodiesel de óleo de girassol com antioxidantes

Avaliação da estabilidade oxidativa de biodiesel de óleo de girassol com antioxidantes

Total alcoholic acidity and pH tests as quality parameters in stored soybean grains

Accumulated and weekly CO2 production by lubricant and soy oil biodegradation in aqueous media by aerobic respirometry

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