The use of rosemary extracts in vegetable oil-based lubricants

The use of vegetable oils as basestocks represents an important alternative to mineral lubricants. However, vegetable oil oxidation is a serious disadvantage for its use as a lubricant. In this sense, the use of natural antioxidant additives, which were obtained by different extraction processes from the rosemary plant, has been investigated to prevent the oxidation process in two selected potential vegetable oil-based lubricants (high oleic sunflower (HOSO) and castor (CO) oils). A variety of rosemary extracts with a different distribution of phenolic diterpene compounds have been obtained depending on the solvent used (n-hexane, methanol or 50% (v/v) methanol–water). The antioxidant resistance of these oils containing rosemary extract has been analyzed under accelerated conditions using both the ASTM D942-02 and ASTM E2009-08 standards. The results showed that the rosemary extracts are better solubilized in CO than in HOSO, obtaining the highest oxidation onset temperatures in CO. In addition to this, the rosemary extracts obtained with polar solvents had the highest concentration of rosmarinic acid, and showed a better antioxidant activity in CO; whereas the extract obtained with a non polar solvent had the highest concentration of carnosic acid, showing a better antioxidant activity in HOSO than the rest of rosemary extracts studied.

[1]  A. Nag,et al.  Studies on a natural antioxidant for stabilization of edible oil and comparison with synthetic antioxidants , 2006 .

[2]  R. Nucci,et al.  Olea europaea L. leaf extract and derivatives: antioxidant properties. , 2002, Journal of agricultural and food chemistry.

[3]  A. Gómez-Caravaca,et al.  Identification of phenolic compounds in rosemary honey using solid-phase extraction by capillary electrophoresis-electrospray ionization-mass spectrometry. , 2006, Journal of pharmaceutical and biomedical analysis.

[4]  G. Stachowiak,et al.  Vegetable oil-based lubricants—A review of oxidation , 2007 .

[5]  Stephen S. Chang,et al.  Elucidation of the chemical structures of natural antioxidants isolated from rosemary , 1982 .

[6]  Wilfried J. Bartz,et al.  Lubricants and the environment , 1998 .

[7]  Christian V. Stevens,et al.  Industrial products from lipids and proteins , 2004 .

[8]  Albino Bento,et al.  The use of olive leaves and tea extracts as effective antioxidants against the oxidation of soybean oil under microwave heating , 2013 .

[9]  I. Castanheira,et al.  Analytical strategies to evaluate antioxidants in food: a review , 2010 .

[10]  Sevim Z. Erhan,et al.  Lubricant basestocks from vegetable oils , 2000 .

[11]  C. W. Lea,et al.  European development of lubricants derived from renewable resources , 2002 .

[12]  E. Ponce-Alquicira,et al.  Antioxidant effect rosemary (Rosmarinus officinalis L.) and oregano (Origanum vulgare L.) extracts on TBARS and colour of model raw pork batters. , 2009, Meat science.

[13]  B. N. Shyamala,et al.  Leafy vegetable extracts—antioxidant activity and effect on storage stability of heated oils , 2005 .

[14]  C. Gallegos,et al.  Natural and synthetic antioxidant additives for improving the performance of new biolubricant formulations. , 2011, Journal of agricultural and food chemistry.

[15]  N. Okamura,et al.  High-performance liquid chromatographic determination of carnosic acid and carnosol in Rosmarinus officinalis and Salvia officinalis , 1994 .

[16]  Grete Bertelsen,et al.  Spices as antioxidants , 1995 .

[17]  R. Cole,et al.  Relevance of carnosic acid concentrations to the selection of rosemary, Rosmarinus officinalis (L.), accessions for optimization of antioxidant yield. , 2004, Journal of agricultural and food chemistry.

[18]  L. Lazzeri,et al.  Biolubricants for the textile and tannery industries as an alternative to conventional mineral oils: An application experience in the Tuscany province , 2006 .

[19]  Y. Zu,et al.  Oxidative stability of sunflower oil supplemented with carnosic acid compared with synthetic antioxidants during accelerated storage , 2010 .

[20]  H. Tamura,et al.  Recovery mechanism of the antioxidant activity from carnosic acid quinone, an oxidized sage and rosemary antioxidant. , 2002, Journal of agricultural and food chemistry.

[21]  C. Tekkaya,et al.  Antioxidative and Free Radical Scavenging Properties of Rosemary Extract , 1997 .

[22]  M. Thorsen,et al.  Quantitative determination of phenolic diterpenes in rosemary extracts. Aspects of accurate quantification. , 2003, Journal of chromatography. A.

[23]  Sevim Z. Erhan,et al.  Oxidation and low temperature stability of vegetable oil-based lubricants , 2006 .

[24]  E. Aluyor,et al.  The use of antioxidants in vegetable oils – A review , 2008 .

[25]  Shu-wen Huang,et al.  Antioxidant activity of a rosemary extract and its constituents, carnosic acid, carnosol, and rosmarinic acid, in bulk oil and oil-in-water emulsion , 1996 .

[26]  M. Dunn,et al.  Oxidative Stability of Conventional and High-Oleic Vegetable Oils with Added Antioxidants , 2008 .

[27]  R. Becker,et al.  An evaluation of antioxidants for vegetable oils at elevated temperatures , 1996 .

[28]  Rolf Luther,et al.  Lubricants in the Environment , 2007 .

[29]  Theo Mang,et al.  Lubricant base fluids based on renewable raw materials: Their catalytic manufacture and modification , 2001 .

[30]  E. Shaker,et al.  Antioxidative effect of extracts from red grape seed and peel on lipid oxidation in oils of sunflower , 2006 .

[31]  C. Rice-Evans,et al.  Structure-antioxidant activity relationships of flavonoids and phenolic acids. , 1996, Free radical biology & medicine.

[32]  Ž. Knez,et al.  Comparison of antioxidative and synergistic effects of rosemary extract with α-tocopherol, ascorbyl palmitate and citric acid in sunflower oil , 2000 .

[33]  A. Willing.  Oleochemical esters - environmentally compatible raw materials for oils and lubricants from renewable resources , 1999 .

[34]  F. Shahidi,et al.  Effects of natural and synthetic antioxidants on the oxidative stability of borage and evening primrose triacylglycerols , 2001 .