Basically, chemicals used in foods can be distinguish into two kinds, those are natural and artificial chemical. Natural chemicals are chemicals which come from plants or animals used as both raw materials and additive materials in making process of a food. One example of natural chemicals which is usually used in foods is celery oil consisting of compounds of limonene (70-80%), sesquiterpenes β-selinene (10%) and humulene. Besides, the special aroma of the celery is caused by the content of phthalides compound.
Meanwhile, artificial chemicals are chemicals produced by human beings made through a chemical reaction from the certain chemical compounds.
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