The analysis of non-volatile organic acids in pineapple
was carried out by HPLC, with a Diode Array UV-vis
detector working at 214 and 254 nm, as described by
Cano et al. (1991). The column was an Ion-300 organic
acids column (Interaction). The eluent was 8.5 mN sulphuric
acid working at 42°C and the flow rate was 0.4
mllmin. Chromatographic standards were 18.56 tLglm1
oxalic, 0.94 mg/ml citric, 0.61 mg/ml L-malic, 0.07
mg/ml quinic and 0.07 m&ml succinic acid. Acids were
quantified by comparing peak areas. Results were
reported as g acid/l00 g fresh weight.