Classification of Food on basis of Acidity

The acidity of food is generally expressed in terms of pH value and it has great influence on distribution of microorganism. Lower the pH, greater the ease of processing or sterilization. On the basis of acidity, food can be classified as follows, Read more

Physiochemical changes during ripening of fruits and vegetables

A fruit can be said to be physiologically mature when it has reached its last slow stage of growth and has developed the ability to ripe normally after harvest. It may be commercially mature in an earlier stage when sufficient desirable characteristic have been developed to make it edible. Commercial maturity is the time of harvest related to end used of market requirement. It may be any stage between development and senescence (quality degradation of ripen fruit). Physiological maturity is particular stage of plant. It is the maximum developed stage of fruits and vegetables.
During the development of growth period of fruit, there are many chemical and physical changes taking place in them. Read more

Control of ripening of fruits and vegetables

Ripening process need to be controlled during handling and storage of fruits and vegetables. Ripening process need to be hastened when there is high demand in the market and ripening process need to be controlled or delayed when there is no demand in the market. Precooling, Changes in atmospheric composition, temperature manipulation, hypobaric storage and irradiation are common practices in controlling the ripening process.

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Climacteric fruits and Ethylene

Climacteric fruit normally ripe after harvest, have higher ethylene production rate response with applied ethylene and result faster and more uniform ripening. Example; mango, apricot, banana, kiwi fruit, avocado, tomato etc. Therefore, climacteric fruits are commercially harvested at their maturity stage before onset of ripening to prevent damage and injury during handling and storage. In other hand, non-climacteric fruits do not ripe if they are harvested before they are ripen. Read more

Fruits and Vegetables : Introduction

A fruit is a seed bearing part of plant and is edible when ripen and fleshy. Many vegetables may be considered fruit in the true botanical sense. Botanically, fruits are those portion of plant which house seeds. Therefore, items such as tomatoes, cucumber, peppers etc. would be classified as fruit on this basis. However, important distinction between fruit and vegetable lies on usage basis. Those items that are generally eaten with main course of meal are considered vegetables. Those that are commonly eaten as deserts are considered fruits. Vegetables are derived from different parts of the plants. Read more