Physical-chemical characterization of pine oil samples and study on surfactants systems action in antimicrobial activity of active phenolic / Caracterização físico-química de amostras de óleo de pinho e estudo da ação de sistemas tensoativos na atividade antimicrobiana de ativos fenólicos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

This work aims at characterizing commercial samples of pine oil with a view at identifying other components that present antimicrobial action besides its o -terpineol. It also aims at evaluating how three different surfactants influence the antimicrobial action of the o-phenyl-phenol, of the o-benzyl-p-chlorophenol and p-chloro-m-cresol. The selected surfactants were the sodium linear alkylbenzene sulphonate (NaLAS), a mixture of triethanolamine and sodium laurate, in addition to sodium alpha-olefins sulfonate (AOS). Pine oil commercial samples and 61 fractions, which were isolated by reduced pressure distillation of a raw pine oil sample, were analyzed based on measures of index of refraction, TG/DTG curves, infrared spectroscopy, GC-FID and GC-MS, odour characterization and antimicrobial activity with the determination of the inhibition disc (against Staphylococcus aureus ATCC 6538 and Salmonella choleraesuis ATCC 10708). It was observed that commercial samples presented marked different compositions according to their origin. TG/DTG curves profile allowed a comparative evaluation of the thermal behavior of those fractions isolated during distillation. Pine oil composition presents a diversity of components with antimicrobial activity. All pine oil samples presented bacteriostatic activity when tested against the two microorganisms mentioned above, and fractions in the composition in which they were inserted presented better bacteriostatic activity against S. aureus. Forty two formulations were prepared taking into consideration the content of biocide of 0, 0.7 and 1.0% (w/w) levels and surfactant of 1.5 e 5% (w/w) levels. Samples were stored into PET nd th th bottles of 30 mL and evaluated as per the pH, color, odour, appearance during 2nd , 4th , 8th and 12th weeks of the stability test, which was carried out at 4, 25 e 45o C. When using Na/TEA laurate, the surfactant system presented better stability. Studied surfactants - AOS, NaLAS and Na/TEA laurate - presented antimicrobial action and positively influenced in active phenolics activity. It was possible to identify the influence of content of surfactant in o stabilizing the phenolic derivative while under a system exposed to high temperature (45 C) inside a PET packaging. Active phenolics content was determined by HPLC using UV detection.

ASSUNTO(S)

surfactants disinfectants antimicrobial antimicrobiano fenólicos monoterpeno pine oil tensoativos Óleo de pinho desinfetantes phenolic

ACESSO AO ARTIGO

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