FAME standard mixture (C4-C24) and isooctane were purchased from Supelco (UK). Protease (from Bacillus amyloliquefaciens), cellulase (from Trichoderma reesei), Folin-Ciocalteu reagent, 5a-cholestan-3b-ol ($95%), sodium methoxide solution (0.5 M, ACS grade), b-sitosterol ($95%), cholesterol ($99%), squalene ($98%), campesterol (∼65%), stigmasterol (∼95%), a-tocopherol ($96%, HPLC grade), g-tocopherol ($96%, HPLC grade), and d-tocopherol ($90%) standards were purchased from Sigma-Aldrich (UK). The Tri-sil HTP reagent was purchased from Thermo Scientic (UK).