ABSTRACT
Hydrolysis of coffee pulp with diluted sulfuric acid was studied by keeping boiling temperature with
reflux, a liquid to solid ratio of 10: 1 and a particle size 2 1.00 mm. Coffee pulp was treated using several
acid concentration (C) and retention times (t). The hydrolysates were analyzed for total sugars by
phenol-sulfuric acid and HPLC (TSPA and TSHPLC), reducing sugar (RS) by DNS and individual
sugars by HPLC. Data ware analyaed by using the Statistical Analysis System (SAS). The average sugar
yields were: TSHPLC between 12.87-20.31% and 14.02-19.01%; TSPA between 23.41-19.07% and
25.7430.58%; RS between 10.2419.07% and 9.6617.80% for (C) y (t) respectively, expressed as wt%
of dry coffee pulp. The general range of variations for individual sugars was: xylose from 0.08 to 3.23;
an&nose from 0.23 to 11.26; fructose from 0.90 to 3.00 and glucose from 1.30 to 6.31, expressed in gl-’
The sucrose varied between 0.08 and 3.96 and maltose between 0.01 and 3.50, also expressed in gl-’ of
hydrolysate. The overall efficiency of hydrolysis was 64% for TSPA and 67% for RS.