“…However, it now seems certain that the methyl ketones in Cheddar cheese are breakdown products of the naturally occurring P-ketoacids in the milk fat triglycerides (Boldingh & Taylor, 1962; Lawrence, 1963; Lawrence & Hawke, 1963& Hawke, , 1966 and that the P-oxidation of FFA is most unlikely. Although chromatographic and mass spectrometric analyses of Cheddar (McGugan, 1962(McGugan, , 1963Day & Keeney, 1958;Basset & Harper, 1958) and blue cheeses (Day & Anderson, 1965) show that certain compounds, particularly methyl ketones, carbinols and esters are found in both types, they need not arise always by the same metabolic pathway. However, it is possible that similar metabolic end products may provide a common denominator, which may be perhaps described as "basic cheesiness", in silch vastly different cheeses as Cheddar and blue cheese.…”