1 Kinetic study of the acidolysis of High Oleic Sunflower Oil with Stearic-Palmitic acid mixtures catalysed by immobilised Rhizopus oryzae lipase Joydeep Ray 1 , Zoltan K. Nagy 1,2 , Kevin W. Smith 3 , Krishnadath Bhaggan 4 , Andrew G. F. Stapley* 1 1 Department of Chemical Engineering, Loughborough University, UK, LE11 3TU 2 School of Chemical Engineering, Purdue University, West Lafayette, IN, 47907-2100, USA 3 Fat Science Consulting Ltd, 16 Arundel Drive, Bedford, UK, MK41 8HP 4 IOI Loders Croklaan Europe, Hogeweg 1, 1521 AZ Wormerveer, The Netherlands Correspondence: Dr Andrew G. F. Stapley Department of Chemical Engineering, Loughborough University, Loughborough, Leicestershire, UK, LE11 3TU Phone: +44-1509-222525 Fax: +44-1509-223923 Email: a.g.f.stapley@lboro.ac.uk Running Title: Acidolysis kinetics of High Oleic Sunflower Oil 1 Abbreviations HOSO High Oleic Sunflower Oil; Sat-O-Sat Disaturate; TAG Triacylglycerol; DAG Diacylglycerol; CBE Cocoa Butter Equivalent; EPA Eicosapentaenoic Acid; DHA Docosahexaenoic Acid; OOO Triolein; St Stearic; P Palmitic, O Oleic; FFA Free Fatty Acids; W Water; X Hydroxyl group; SatSatSat Trisaturate; SPD Short Path Distillation; ODE Ordinary Differential Equation; RMSE Root Mean Square Error.