Every change in food that causes it to lose its desired quality and eventually become inedible is called food spoilage or rotting. Factors affecting storage life
The natural limits to the post-harvest life of all types of fresh produce are severely affected by other biological and environmental conditions: Temperature: An increase in temperature causes an increase in the rate of natural breakdown of all produce as food reserves and water content become depleted. The cooling of produce will extend its life by slowing the rate of breakdown. Water loss:
High temperature and injuries to produce can greatly increase the loss of water from stored produce beyond that unavoidably lost from natural causes. Maximum storage life can be achieved by storing only undamaged produce at the lowest temperature tolerable by the crop. Mechanical damage:
Damage caused during harvesting and subsequent handling increases the rate of deterioration of produce and renders it liable to attacks by decay organisms. Mechanical damage to root crops will cause heavy losses owing to bacterial decay and must be remedied by curing the roots or tubers before storage. Decay in storage:
Decay of fresh produce during storage is mostly caused by the infection of mechanical injuries. Furthermore, many fruits and vegetables are attacked by decay organisms which penetrate through natural openings or even through the intact skin. These infections may be established during the growth of the plant in the field but lie dormant until after harvest, often becoming visible only during storage or ripening. Pretreatments:
It is technique where the commodity is left in the field itself in a heap under shade for few days. It is an effective operation to reduce water loss during storage from hardy vegetables viz., onion, garlic, ssweet potato etc. In case of onion curing is a drying process intended to dry off the necks and 2-3 outer scales of the bulbs to prevent the loss of moisture and the attack by decay during storage. Irradiation
Irradiation is a treatment given to various fruits and vegetables to control different postharvest diseases and disorders. FDA approved irradiation doses up to 1000 Gy for preservation and disinfestation of fresh fruits and vegetables (1986) Adverse effects of irradiation
•Pitting, darkening, discoloration, scalding
•Loss of flavor or aroma
•Higher disease incidence
•Lower vitamin C and
Desapping is done by holding the mango fruits upside down while cutting the stalk of fruits.Desapping of mango fruits is carried out in processing area by trained workers under the supervision of processing supervisor. . Chemical treatment.
ii) Cascade application
iv) Electrostatic sprays
vi) Chemical pads
These are thin layer of edible materials which restrict loss of water, oxygen and other soluble material of food Some advantages of edible coating are as follows: I. It is palatable
II. It reduces environment pollution
III. It has a great effect on taste properties
IV. The It develops nutritional value
V. It has bactericidal effects.
There are different kinds of films which are used such as protein, polysaccharide, lipid and composed films. These films can be placed on fruit and vegetable surfaces through different ways like dipping spraying and fluidized bed systems
Hot-water immersion, high temperature forced air, and/or vapor heat are three heat treatment technologies that can be used for post-harvest insect control for perishable commodities such as fresh fruits (e.g., mangos, papaya, persimmon, citrus, bananas, carambola), fresh vegetables (e.g., peppers, eggplant, tomatoes, cucumber, an Hot water treatment
Although not used for treatment of vegetables and delicate fruits. The hot water...