Investigation of stability of cold pressed linseed (Linum usitatissimum L.) oil

Abstract

The stability of linseed (Linum usitatissimum) oil has been investigated through the exposition of two different samples, linseed oil without antioxidant and linseed oil with roesemary (Rosmarinus officinalis) extract, to ambient temperature conditions (25°C) and refrigerator temperature conditions (4°C). The oxidation degree of linseed oil was characterized by acid value, peroxide value, which present value for determination primary oxidation processes, and TBARS value expressed through the percent of inhibition, which present value for determination secondary oxidation processes. Acid value in all investigated samples was in the range from 1.90 to 1.97 mL/g. Peroxide value was in the range from 1.27 to 3.27 mL/g. The percent of inhibition of oxidation in investigated samples was from 10.41 to 11.10%. The storage conditions influence primary oxidation processes in oil, while the presence of rosemary extract influences secondary oxidation processes.

Stabilization of rose hip oil with pomegranate peel extract during accelerated storage

“…Thiobarbituric acid reactive substances (TBARS) assay Thiobarbituric acid reactive substances (TBARS) were determined according to the procedure reported by Drinić et al with slight modifications. 24 3-chloroacetic acid (15 g) was added in hydrochloric acid (0.25 M, 100 mL) and after that thiobarbituric acid (0.375 g) was added in that solution to obtain thiobarbituric acid solution. The oil sample (0.5 g) was added to the thiobarbituric acid solution (2.5 mL) and after that mixture was heated in a boiling water bath for 10 minutes, cooled, sonicated for 30 min and centrifuged at 3000 rpm for 10 minutes.…”