operating
at 65 C with 89% H2SO4 (5 mM) and 11% acetonitrile
as an eluent at a flow rate of 0.7 mL/min. Acetic and formic
acids analysis was carried out with the HPLC system
with a refractive index detector mentioned above with a
Bio-Rad HPX-87 H column at 65 C temperature.