Experiments have shown that most suitable for drying the raw material is the temperature about 50 C. At this temperature the action of enzymes decreases or stops completely. In some cases, recommend that at the beginning of drying performed at a high temperature and then at about 50 C. The rapid drying is carried out in special kilns, elevator kilns, vacuum drying, etc., which are equipped with devices for regulation temperature. Particularly fast to dry the juicy fruit, containing vitamins. The temperature can be raised to 70 -90 C, so that much of the vitamin is retained.
Also need to be dried quickly and feedstock containing cardiac glycosides, alkaloids and contain raw materials. To read more click here: Newcastle University. At 50 C and ventilation air is drying material without changing its medical staff. Parts of plants containing essential butter, dried slowly, spread out over their thick, at a temperature of 25-30 C. Under these conditions, during drying of medicinal plant essential oil content may increase, but the quality of oil – to improve. Also allow for slow drying and raw materials, active ingredients which are stable and do not lend themselves easily enzymatic decomposition. Under the influence of direct sunlight, green leaves and colored flowers fade – turn yellow brown, pale, etc.
These types of materials that have lost their natural color, unfit for human consumption. In direct sunlight can dry these parts of the plant, which is not contains dyes – seeds, roots, bark, rhizome and so on. Slow drying is carried out in the open air, and adapted for this purpose rooms.