A method developed in a previous study (Ong et al., 2006) was
used to quantify organic acids in mature cheese samples, except
that 700 lL of 1.55 M nitric acid was used, the slurry was centrifuged
at 3200 g and the aqueous fraction was further centrifuged
at 10000 g using a benchtop centrifuge (Eppendorf, Sydney, Australia).