Definition: -
Glycosides are non-reducing substances, which upon hydrolysis yield sugar and non-sugar parts. The non-sugar part is known as aglycone or genin.
Explanation: -
The usual linkage between sugar and non-sugar is an oxygen linkage between reducing group of sugar and alcoholic or phenolic group hydroxyl group of the aglycone. Such glycosides are known as O-GLYCOSIDES, mostly found in plants.
Other glycosides do however occur in which there is linkage through sulphur, then it is termed as S-GLYCOSICE (As in case of sinigrin). If linkage is through amino group then termed as N-GLYCOSIDES (i.e. adenosine). If linkage is through C-linkage then termed as C-GLYCOSIDES (i.e. barblaoin).
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