Refractive Index and Density Measurements of Peanut Oil for Determining Oleic and Linoleic Acid Contents

摘要: Peanut seed are approximately 50 % oil of which >80 is either oleic or linoleic acid. The oleic/linoleic acid (O/L) ratio largely influences oxidative stability and hence peanut shelf life. Traditional have O/L ratios near 1.5–2.0; however, many new cultivars “high oleic” with ≥9. During handling, contamination among lots may occur. A cost effective method to rapidly differentiate based on needed across multiple segments the industry, measurements density refractive index (RI) were evaluated for this potential. Fatty profiles samples from normal high lots, blends these oils, determined by traditional gas chromatography analysis data compared corresponding RI measurements. Oleic content, all strongly linearly (R2 > 0.98) correlated ~2 16. Threshold values both showed excellent potential differentiating an ≥ 9; sample volume requirements preclude single seed.