The respiration rate of coated apple slices was measured by
static method Apples were peeled and cut into 8 slices, which were
immersed in coating formulations for 2 min, placed in a sieve and
left at room temperature (15 C and 80% RH) for 1 h to dry the
coating material. The samples (around 50 g) were placed in sealed
180 mL glass jars with silicon septum. The jars were closed and kept
at 5 C during 1 h. After this time, gas sampling was carried out
using an O2/CO2 Dual Head Space Analyzer (Model PAC CHECK 325,
Mocon, Minneapolis, USA), measuring the CO2 production. Uncoated
apple slices were used as control in order to calculate the
coatings efficiency. The respiration rate was determined in triplicate
and expressed in mL CO2 kg1 h1
.