Introduction: Food preservation

What Are Foods? materials orallygrowth healthpleasure Foods are materials (raw, processed, or formulated) that are consumed orally by humans or animals for growth, health or pleasure. Generally, there is no limitation as there is for a drug Generally, there is no limitation on the amount of food that may be consumed (as there is for a drug in the form of dosage). This does not mean that we can eat any food item as much as we want. Excessive amounts could be lethal, for example, salt, fat, and sugar. based on the types of food The preservation method is mainly based on the types of food that need to be prepared or formulated.

of “ Definition of “Food preservation” : maintain foods desired properties for as long as possible. Food preservation involves the action taken to maintain foods with the desired properties or nature for as long as possible. identify the properties First, it is important to identify the properties or characteristics that need to be preserved. apple juice to be clearorange juice could be cloudy. One property may be important for one product, but detrimental for others. For example, the consumer expects apple juice to be clear whereas orange juice could be cloudy.

Why Preservation?  To overcome inappropriate planning in agriculture  Produce value-added products  Provide variation in diet

In food preservation, the important points that need to be considered are: A: The desired level of quality B: The preservation length C: The group for whom the products are preserved Quality??? Definition of Quality???

A: The desired level of quality Quality Definition: Quality is … “ the degree of fitness for use” “ the degree of fitness for use” or “the condition indicated by the satisfaction level of consumers” Quality Quality is an deceptive, ever-changing concept.

end of its shelf life When food has deteriorated to such an extent that it is considered unsuitable for consumption, it is said to have reached the end of its shelf life. In studying the shelf life of foods, What is more important? Quality or Safety?

Safety quality In studying the shelf life of foods: Safety is the first attribute, the second is other quality. qualityvaried The product quality attributes can be quite varied, such as:  Appearance  microbial characteristics  Organoleptic properties  …

Organoleptic: Sensory properties detected by the sense organs Sensory properties that can be detected by the sense organs. Include: 1) Taste 2) Texture 3) Astringency 4) Aroma

1- Taste The tongue can distinguish five separate tastes: 1) sweet 2) salt 3) sour (or acid) 4) bitter 5) savoury (or umami) classic tastes Sweet, salt, sour and bitter are classic tastes.

tastyhaving a pleasant flavor *Savoury: means tasty, having a pleasant flavor * Umami: Japanese name savoury  The Japanese name for a savoury flavour, now considered one of the five basic senses of taste. monosodium glutamate (t) amino acidsproteinribonucleotides It is name given to the special taste of monosodium glutamate (the sodium salt of glutamic acid), some other amino acids, protein and the ribonucleotides. enhances or potentiates the flavours without itself imparting These are flavour enhancer: A substance that enhances or potentiates the flavours of other substances without itself imparting any characteristic flavour of its own.

2- Texture physical properties 3- Astringency  (perceived in the mouth)  The action causing a contraction of the epithelial tissues of the tongue  Due to tannins (tannic acid) found in a variety of plants such as unripe fruits, tea, …) 4- Aroma (perceived in the nose)

Loss of quality Loss of quality is highly dependent on types of :  Food and composition  Formulation (for manufactured foods)  Packaging  Storage conditions

B: The preservation length After storage for a certain period reach an undesirable state After storage for a certain period, one or more quality attributes of a food may reach an undesirable state. unsuitable for consumption end of its shelf life At that time, the food is considered unsuitable for consumption and is said to have reached the end of its shelf life. shorter than the shelf life “Best-before date” is set shorter than the shelf life with a good margin. stored at the recommended conditions safe and palatable a long time after the best-before date How ever, if product stored at the recommended conditions it is usually safe and palatable to consume a product a long time after the best-before date. pack datebest-before date Products may be marketed with the production date “pack date” and “best-before date.” expiration date best-before date Alternative markings is “expiration date”, which may be closer to shelf life than “best-before date”.

C: The group for whom the products are preserved Nutritional requirements different population groups Nutritional requirements and food restrictions apply differently to different population groups. Food poisoning can be fatalinfants pregnant womenelderlydepressed immune systems Food poisoning can be fatal, especially in infants, pregnant women, the elderly, and those with depressed immune systems.

TQM =? HACCP=? ISO=? GMP=? GHP=?

TQM = Total quality management HACCP Hazard Analysis and Critical Control Points INTERNATIONAL STANDARDS ORGANIZATION (ISO) Good Manufacturing Practice (GMP) Good Hygiene Practice (GHP)