The peroxide value (PV) indicates the level of primary oxidation through measurement of the primary oxidation products. As the oil deteriorates further, these primary products (hydroperoxides) break down to give off-flavour and odour-producing compounds which are detected by the p-anisidine (AV) test. Effectively, the PV indicates the current oxidation state of the oil and the AV indicates its oxidation history. Neither figure should be relied on alone. Rather, they should be combined (AV + 2PV) to give the Totox value, which is an overall indicator of rancidity.'
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