like fresh fruit and vegetables since excessive weight loss
of food must be avoided.
Recently, Singh et al. (2010) and Saengerlaub et al. (2011)
developed humidity regulating package system by directly
incorporating the active substance (NaCl) in the packaging
material. It consists of 3-layer structure: barrier layer, active layer
with NaCl and sealing layer. The active layer consisted of
polypropylene with different percentage of NaCl (6, 12 and 18%)
and it was foamed and stretched in order to form cavities around
salt particles. The authors evaluated the impact of humidity
regulating trays on the quality of fresh mushrooms. Based on both
sensory and biochemical analysis, it was reported that the shelf life
of fresh mushrooms was significantly increased by 6 days (d) in
trays with 18% NaCl on a weight basis in the active layer as
compared to conventional pack at 5 C. However, limited
information is available on the transpiration and condensation
behaviour of mushroom and the package, respectively. The
objectives of this study were (i) to investigate the transpiration
behaviour of mushroom under different storage conditions, and (ii)
to assess humidity regulation and condensation behaviour in
humidity-regulating tray containing mushrooms.