Raisins are dried grapes/currants. However, unlike fresh grapes, they indeed are rich and concentrated sources of energy, vitamins, electrolytes, and minerals. On weight per weight comparison basis, 100 g of dried grapes hold 249 calories, several times more fiber, vitamins, minerals and poly-phenol antioxidants than the fresh grapes. Raisins, however, contain fewer amounts of vitamin C, folic acid, carotenes, lutein and xanthins than fresh grapes.
In general, fresh grapes, either seedless or seed types of the Vinifera species such as Thompson seedless (Sultana), Sugarone, Calmeria, Corinth and etc., are subjected to dry under sunlight or mechanical drying techniques. In some cases, the whole bunch of grapes may be allowed to dry on the vine itself (vine-dried). Ordinarily, their moisture content should not exceed 16% of dry weight. Thoroughly dried raisins are then further stemmed, cap-stemmed, sorted, and cleaned in order to obtain high quality, dried berries. At the commercial level, raisins are processed and graded further before sent to the markets.
Raisins are one of the most sought-after items used in the confectionary.