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A new research study published in Nature has identified Pistacia khinjuk oil as a potent natural stabilizer capable of significantly enhancing the oxidative stability of frying oil blends. The study evaluated a mixture of corn, canola, and sesame oils blended with P. khinjuk oil at concentrations ranging from 5% to 20%. The findings demonstrate that these blends can maintain high quality and safety standards over a six-month storage period under repeated thermal treatment, addressing a major challenge in the food processing industry.
According to the data, the 20% blend (designated as TK20) showed the most robust performance. It maintained a high induction period of 18.39 hours at the end of the six-month period, compared to 18.52 hours at the start. Significant reductions were observed in key degradation metrics; the acid value for TK20 was just 0.056% at month six, and the peroxide value stood at 5.30 meq O2/kg, substantially lower than the 7.6 meq O2/kg recorded in the control sample. Furthermore, Totox values were reduced to 16.2 in the 20% blend versus 19.7 in the control, proving the oil's efficacy in inhibiting both primary and overall oxidation.
A critical safety benchmark in frying oils is the formation of polar compounds. The research highlighted that P. khinjuk oil inhibited this process in a dose-dependent manner, with the TK20 blend remaining at 9.2%, safely below the 10% industry threshold. This stability is attributed to the oil's rich biochemical profile, which includes oleic acid levels of up to 60%, high concentrations of alpha and gamma-tocopherols, and a diverse range of phenolic compounds such as gallic acid and catechin.
The industry implications are significant, as the 'blending effect' observed provides a sustainable, clean-label alternative to synthetic antioxidants like tert-butylhydroquinone (TBHQ) and butylated hydroxytoluene (BHT). By leveraging the synergistic interactions between hydroxycinnamic acids and tocopherols found in P. khinjuk, manufacturers can extend the shelf life and thermal resistance of frying oils without compromising sensory integrity or nutritional value. This approach aligns with the global shift toward minimally processed ingredients and green chemistry in food production.
Source: Nature