In the modern era of health consciousness, consumers are well
aware regarding health and consequently about food components.
Consumers demand foodswhich are natural, nutritionally
better, free from chemical preservatives and microbiologically
safe with extended shelf-life. Today, many processed
foods like juice, milk and canned products are treated at
high temperature to kill bacteria. Processing at high
temperature lowers the nutritional quality of foods
because many nutrients are heat labile.