Drying of Stevia leaves using laboratory and pilot scale dryers

Samsudin Ahmad, . and Abd. Aziz Ibrahim, . Drying of Stevia leaves using laboratory and pilot scale dryers. pp. 137-147. ISSN 1394-9829

Drying at temperatures of 50 “ 60 C was an effective method in removing moisture content of Stevia plants. At this temperature the quality of dried leaves produced in terms of colour sweetness and nutrient content was better compared with drying at 70 C. The drying process took 5 to 6 h using a laboratory dryer and more than 7 h using a pilot scale dryer to reduce the moisture content from 80 to 3 “ 5. A total of 72 “ 74 dried leaves were obtained after threshing the final dried samples. The dried leaves had a brighter (L) greener (a) and slightly yellow (b) colour with values of 54 “ 3.0 and 9 respectively when dried at 50 C compared to samples dried at 60 “ 70 C. Dried Stevia leaves contained stevioside and various types of nutrients and minerals. In every 100 g of dried leaves there were 16 g protein 65 g carbohydrate 2 805 mg potassium 620 mg calcium 268 mg phosphorous and 16 mg vitamin C. Dried Stevia leaves also contained soluble sugars at 5 “ 7 brix with pH around 6.

Full text available from: Official URL: http://ejtafs.mardi.gov.my/jtafs/41-1/Stevia%20lea...

Abstract

Drying at temperatures of 50 “ 60 C was an effective method in removing moisture content of Stevia plants. At this temperature the quality of dried leaves produced in terms of colour sweetness and nutrient content was better compared with drying at 70 C. The drying process took 5 to 6 h using a laboratory dryer and more than 7 h using a pilot scale dryer to reduce the moisture content from 80 to 3 “ 5. A total of 72 “ 74 dried leaves were obtained after threshing the final dried samples. The dried leaves had a brighter (L) greener (a) and slightly yellow (b) colour with values of 54 “ 3.0 and 9 respectively when dried at 50 C compared to samples dried at 60 “ 70 C. Dried Stevia leaves contained stevioside and various types of nutrients and minerals. In every 100 g of dried leaves there were 16 g protein 65 g carbohydrate 2 805 mg potassium 620 mg calcium 268 mg phosphorous and 16 mg vitamin C. Dried Stevia leaves also contained soluble sugars at 5 “ 7 brix with pH around 6.

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Item Type:	Article
AGROVOC Term:	Stevia
AGROVOC Term:	Drying
AGROVOC Term:	Dryers
AGROVOC Term:	Temperature
AGROVOC Term:	Moisture content
AGROVOC Term:	Threshing
AGROVOC Term:	Stevioside
AGROVOC Term:	Stevia rebaudiana
AGROVOC Term:	Relative humidity
AGROVOC Term:	Nutrient status
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:29
URI:	http://webagris.upm.edu.my/id/eprint/24454

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