The Rancimat test of the samples was performed using a 743
Rancimat analyzer based on the method of Ho, Chen, Shi,
Zhang, and Rosen (1992) with a minor modification. Because
commercially commercial vegetable oil often contain antioxidants,
lard was freshly made as the source of oxidants. Aliquots
(3 mL) of phenolic extracts with freshly lab made lard
(3 g) were subjected to oxidation at 110 C (air flow 20 L/h