Postharvest treatments to reduce chilling injury symptoms in stored ...

condition, off-flavor and skin discoloration of fruits will occur (Hatton and Reeder,
1966).
The basic idea of Controlled Atmosphere Storage (CA) is to maintain the best
product quality. This can be accomplished by keeping CO2, O2 and Ethylene gases at
predetermined levels (gas levels differ depending on the type of fruit being stored).
Usually decreased O2 and increased CO2 levels at a low temperature with high RH are
suitable for stored commodities. CA can provide an effective storage environment for
different fruits and vegetables (Raghavan et al., 2003, 1984; Bender et al., 2000; Gariépy
and Raghavan, 1991, 1986, 1984; Kader 1986).
Modified atmosphere (MA) is referred to as a relationship between product
respiration and gas exchange within any form of structural enclosure. MA storage
technique can be used to maintain the postharvest quality of different fruits (Ding et al.,
2002; Rodov et al., 2002; Meir et al., 1998; Illeperuma and Jayasuriya, 2002; Prabhanjan
et al., 1992). MA packaging inhibited the mango ripening process (Sornsrivichai et al.,
1989, 1992). In 1994, Yantarasri et al., found that film perforation delay softening and
can reduce the weight loss of mango cv. Nam Doc Mai.
Diffusion channel method is a system where gas diffuses in a storage chamber,
through a tube, that connects the ambient air with the chamber atmosphere. Several
researchers (Ratti et al., 1998; Baugerod, 1980; Ramachandra, 1995) have successfully
demonstrated that by using diffusion channels the gas exchange capability and the
maintenance of equilibrium O2 level can be achieved over a long period of time. The
advantage of these systems is that pressure and temperature fluctuations do not
significantly affect the system. It should be noted that studies related to mango storage
using diffusion channels is not available in the literature. There is scope to study this
technique for extending shelf life of mangoes.
2.2.3 Storage at low pressure
Low pressure storage, also called hypobaric storage, deals with the control of air
pressure, temperature and humidity. The main principle of low pressure is that the
pressure of the chamber is directly proportional to the O2 level. With a pressure decrease,
the amount of O2 decreases reducing the respiration rate of the product. This system easily
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