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Generally all the food samples that are derived from biological material (liquid or solid) can be divided into the five categories depending on the content as shown in the following Table. This type of broad classification helps to choose the sampling clean up technique or analytical technique.
Table: General Classification of food samples according to their content
| Sample
|
Character
|
Typical analytes
|
| Milk
|
Aqueous, proteins, lipids
|
Veterinary drugs, toxic elements, pesticides, industrial contaminants.
|
| Eggs
|
High lipids and albumin content
|
Veterinary drugs, industrial contaminants, pesticides
|
| Other samples of animal origin (e.g. muscle, liver, fat)
|
Various water, plant pigments, lipids, proteins, essential oils or waxes
|
Drugs, industrial contaminants, pesticides.
|
| Plant material (e.g. Fruits, vegetables, seeds)
|
Various water, plant pigments, lipids, proteins, essential oils or waxes
|
Pesticides, toxic elements, industrial contaminants.
|
| Other Foods (e.g. meat, fish, milk, cereals, wine, juices, plant oils, sugar)
|
Various fat, oils, lipids, proteins, sugar, starch, water, or pigments.
|
Pesticides, industrial contaminants, synthetic colorants, additives, synthetic sweeteners, antioxidants.
|
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