After being cultivated for 5,000 years, the onion has topped our salads and meals along with its myriad health benefits and strong aroma.
The traditional method of storing onions is to dry them off their stems and store them in a cool cellar, cave, or dark warehouse after they are harvested until consumed. However, 40-80% of onions stored with this method result in spoilage. At the moment, neither the economy nor our aging planet can afford this kind of deterioration.
Onions cannot be immediately stored in cold rooms after harvest. First, the onions need to dry for a few days. Then begins the maturation stage that allows the formation of skin and specific color for the onion cultivar.
Onions are prepared for Onion cold storage in India by lowering the temperature to the maximum by 0.5 ° C per day to reach the ideal cold storage temperature little by little.
Depending on the variety of onions, they are stored between 0 ° C and +2 ° C in cold storage. Onions can be stored in cold storage for up to 10 months without spoilage. Ventilation is vital in onion storage.
After storage, the onions are not transported directly from cold storage before marketing but instead are heated under controlled temperature conditions to avoid condensation.
It is a somewhat complicated process, but it is worth it. However, only 20 million tons of world onion production of 100 million tons is stored with modern storage methods and the deterioration continues.
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Tips for industrial horticultural refrigeration:
Onion cold storage in India for fruits and vegetables is essential so that these fresh foods are kept in good condition until they reach consumers. Thanks to this process, they are not harmful to health and, in addition, their useful life is prolonged by delaying ripening. These fruit preservation methods also reduce potential economic losses for suppliers.
Process of preservation and refrigeration of fruits and vegetables:
Refrigeration is the preservation process that fresh fruits and vegetables undergo. It is carried out in cold rooms in a controlled atmosphere. These facilities control all the factors that can affect the state of food and the development of microorganisms:
– Air renewal
– All these processes are carried out using humidifiers, catalysts, and carbon dioxide scrubbers, and always knowing the most appropriate temperature to preserve fruits in each case.
If the Onion cold storage in India for fruits and vegetables uses CO2, ammonia as cooling compounds, and/or glycol as heat transfer fluid, they are considered ecological facilities.
Refrigeration for fruit:
The refrigeration process of the fruit depends on its point of ripeness, properties, and active metabolism.
Non-climacteric fruits – such as pineapple, grape, strawberry, or citrus – are those that have a single point of ripeness. Therefore, greens cannot be picked because they will not continue to ripen.
Climacteric fruits – such as apple, pear, or banana – continue to ripen after harvest. Therefore, for them to be well eaten, they must be collected before they are ripe.
To activate and continue their process they must be cold. The respiration of the fruit will determine the time and temperature at which they will be. Get in touch with us at Natural Storage Solutions Pvt.Ltd. to know about onion cold storage in India.
Refrigeration for vegetables:
As with fruits, each type of vegetable needs specific refrigeration conditions to guarantee its conservation.
Garlic and onions need 70% humidity. In the case of garlic, the storage temperature is -3ºC, while onions can reach 1ºC. Correct air circulation in the chamber is essential. It must be taken into account that the onions must be dried beforehand and stored on wooden pallets to keep perfectly in the chambers.
For their part, potatoes are kept in perfect condition if they are stored between 3 and 10 months with a humidity of more than 90% and temperatures of 5ºC. For more information on onion cold storage in India, do visit our site – Natural Storage Solutions Pvt.Ltd.
Types of cold rooms:
At present, various types of cold rooms can be found on the market in which the refrigeration of fruits and vegetables can be carried out, which are adapted in size and functionalities to the requirements of each business.
The refrigeration chambers are the basic facilities, which can keep food in good condition between 10º C and -4º C. Modular Onion cold storage in India respects the temperature to preserve fruits and can be adapted to different spaces, guaranteeing the total insulation of the product. In addition, they allow energy savings of up to 25% in the application of fruit preservation methods.
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Importance of air renewal in fruit preservation methods:
Ventilation or air renewal is essential to ensure the proper cooling of fruits and vegetables. It must be taken into account that ethylene is produced during the ripening of climacteric fruits.
Therefore, it must be removed from the environment. Likewise, the products consume oxygen inside the cold rooms for fruits and vegetables. By renewing the air, it is achieved that oxygen does not run out and, consequently, that food does not ferment.
Optimal cooling temperatures for fruits and vegetables:
It must be taken into account that high temperatures damage tissues, destroy enzymatic activity, and change the texture of the fruits. In the same sense, excessively low temperatures in the cold rooms for fruits and vegetables can also cause alterations that damage them completely.
This is especially important in the case of tropical fruits, which can already have lesions and changes in taste at temperatures between 5ºC and 14ºC. Therefore, it is important to maintain optimal refrigeration temperatures for fruits and vegetables.
To avoid all these problems in the refrigeration of fruits and vegetables, the temperature can be controlled with a field of thermal sensors with damping, and with a witness probe in the product.
Taking into account these basic requirements for the refrigeration of fruits and vegetables allows us to guarantee their optimal conservation and ensure that they can be consumed without any type of alteration.