Evaluation location: Minnesota, United States
Accessions were first screened using a refractometer. Accessions which had low refractive index values (indicative of high oleic acid content) were then screened using G.C. analysis to determine fatty acid content. Oleic and linoleic acid contents were estimated for all accessions using the following formulas: Linoleic Acid % = 9601.0 (RI) + 3.213 (T) - 14159.5 Oleic Acid % = -9474.0 (RI) - 3.170 (T) + 14059.9 Where: RI = refractive index value and T = 21 degrees Centigrade. From Goss, D.W. 1978. Estimating the linoleic and oleic acid contents of sunflower oil by refractive index. Proceedings of the eigth international sunflower conference: 564-569.