Antioxidant activity of sesame, rice bran and bene hull oils and their unsaponifiable matters

Abstract

Chemical composition of sesame (SEO), rice bran (RBO) and bene hull (BHO) oils was determined. During oven test, peroxide value on day 8 (PV 8 , meq/kg) and carbonyl value on day 6 (CV 6 , mmol/g) were considered as measures of resistance to the formation of primary and secondary oxidation products, respectively. The SEO and BHO showed statistically the same PV 8 (381.4 and 359.8, respectively) and CV 6 (25.2 and 25.8, respectively), and their stabilizing effect was significantly better than that of the RBO (455.5 and 32.7, respectively). The unsaponifiable matters (USM) fraction of the BHO (443.7 and 26.8, respectively) had an antioxidative effect higher than those of the SEO (478.0 and 38.6, respectively) and RBO (482.4 and 37.4, respectively). There was a good correlation (R 2 ¼ 0.972) between the PV 8 and CV 6 throughout oxidation period. On the basis of the oxidative stability index (OSI, h) of Rancimat test, the best carry-through properties belonged to the SEO (6.92 h), followed by the RBO (6.12 h) and BHO (5.0 h), and also a similar order was observed for the USM fractions (5.89, 5.28 and 4.50 h, respectively). There was no correlation between the results of Rancimat and oven tests, showing that the powerful antioxidative agents under oven test conditions were lack of appropriate carry-through properties. The highest significant reducing power (mmol/L) belonged to the SEO (258.1), followed by the RBO (218.7) and BHO (152.4), whereas the USM fraction of the SEO indicated the least significant quantity among the USM fractions (89.3 vs. 216.6 and 158.0 for the RBO and BHO, respectively).

Chemical composition, antioxidant and antibacterial properties of Bene (Pistacia atlantica subsp. mutica) hull essential oil

“…It appears in a wooden hard shell coated with dark green hull containing highly stable and antioxidative oil (Farhoosh et al 2009). Interestingly, the antioxidant activity of the oil (non-volatile) during frying of sunflower oil has been higher than those of sesame and rice bran oils (Farhoosh et al 2011b). Local people use the fruits of Bene after grinding and mixing with other ingredients as foods, and unripe Bene are also used as jam.…”

Sesame indicum, a nutritional supplement, elicits antiamnesic effect via cholinergic pathway in scopolamine intoxicated mice

“…Methanolic sesame extract was shown to possess major lignans like sesamolin and sesamin (Sukumar et al, ) and minor lignans such as acuminatolide, piperitol, and pinoresinol (Kuo et al, ). Methanolic extract was also reported to possess rich antioxidant activity than n ‐hexane extract which was corroborated to high lignans content (Farhoosh and Sharif, ). Further, lignans were reported for neuroprotective effects (Park et al, ) Hence, we decided to use methanol as solvent to prepare the extract of sesame seeds.…”

Development of a spectroscopic method to determine the content of free radical scavenging compounds and oxidation products in thermally oxidised oils

“…Farhoosh et al . () used toluene as the DPPH solvent and determined antioxidant capacities of vegetable oils, methanolic and hexane oil extracts, and unsaponifiable oil matter. Uluata & Ozdemir () tested the antioxidant activity of unconventional oilseeds, including stinging nettle, laurel, terebinth, hemp and radish, using DPPH in ethyl acetate.…”

“…Prevc et al (2013) suggested that ethyl acetate could be an appropriate solvent for DPPH with refined oils, which have practically no polyphenols, while buffered alcohols are good for unrefined oils including extra virgin olive oil, sesame oil and pumpkin seed oil. Farhoosh et al (2013) used toluene as the DPPH solvent and determined antioxidant capacities of vegetable oils, methanolic and hexane oil extracts, and unsaponifiable oil matter. Uluata & Ozdemir (2012) tested the antioxidant activity of unconventional oilseeds, including stinging nettle, laurel, terebinth, hemp and radish, using DPPH in ethyl acetate.…”