The free phenolics content in the treated and untreated WWF was determined using the method described by Singleton, Orthofer, and Lamuela-Raventos (1999), with some modifications.
Die gratis phenolics inhoud in die behandelde en onbehandelde WWF is bepaal volgens die metode beskryf deur Singleton, Orthofer en Lamuela-Raventos (1999), met 'n paar veranderinge.