Abstract
Soybean oil may protect against cancer of the breast and prostate. It may also exert beneficial influence in combination with other oils. Here, blends (20%, v/v) of sea buckthorn oil (SEBO), camellia oil (CAO), rice bran oil (RBO), sesame oil (SEO) and peanut oil (PEO) with soybean oil (SBO) were formulated. Oxidative stability (OS) and radical scavenging activity (RSA) of SBO and blends stored under oxidative conditions (60°C) for 24 days were studied. By blending with different kinds oils, levels of polyunsaturated fatty acids (PUFA) decreased, while monounsaturated fatty acid (MUFA) content increased. Progression of oxidation was followed by measuring peroxide value (PV), p-anisidine (PAV), conjugated dienes (CD) and conjugated trienes (CT). Inverse relationships were noted between PV and OS at termination of storage. Levels of CD and CT in SBO, and blends, increased with increase in time. The impact of SEO as additives on SBO oxidation was the strongest followed by RBO, CAO, SEBO and PNO. Oxidative stability of oil blends was better than SBO, most likely as a consequence of changes in fatty acids and tocopherols' profile, and minor bioactive lipids found in selected oils. The results suggest that these oil blends could contribute as sources of important antioxidant related to the prevention of chronic diseases associated to oxidative stress, such as in cancer and coronary artery disease.
Highlights
Soybean consumption is associated with reduced risk of cancer of the breast and prostate and may enhance survival (Zhu et al, 2011; Kang et al,., 2012; Zhang et al, 2012; Sugiyama et al, 2013)
Progression of oxidation was followed by measuring peroxide value (PV), p-anisidine (PAV), conjugated dienes (CD) and conjugated trienes (CT)
Oxidative stability of oil blends was better than soybean oil (SBO), most likely as a consequence of changes in fatty acids and tocopherols’ profile, and minor bioactive lipids found in selected oils
Summary
Soybean consumption is associated with reduced risk of cancer of the breast and prostate and may enhance survival (Zhu et al, 2011; Kang et al,., 2012; Zhang et al, 2012; Sugiyama et al, 2013). Mixing different kinds of vegetable oils can change fatty acids profile, and increase the levels of bioactive lipids and natural antioxidants in the blends and give better quality oils, as well as improved nutritional value at affordable prices (Marmesat et al, 2012; Aladedunye and Przybylski, 2013). The sea buckthorn (Hippophae rhamnoides L), known as Siberian pineapple, sea berry, sandthorn and swallowthorn, has a long history of application as a food and medicinal ingredient in eastern countries Both seeds and the soft parts (fruit flesh and peel) of the berry are rich in lipids, vitamins, minerals, flavonoids and antioxidants both aqueous and lipophilic (Dhyani et al, 2007; Shah et al, 2007). Sesame seed (sesamum indicum L.) is one of the world’s most important and oldest oilseed crops with a high level content of antioxidant known to human health It is highly valued for its unique and pleasant flavor (Latif and Anwar, 2011). Results from this study will aid the program of selecting unique oil blends for improved nutritional value and will provide insight into the mechanisms of the antioxidant
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