Comparative study of color retention of dried stevia leaves (Stevia rebaudiana Bertoni) by single-stage drying and multi-stage drying

Name: Praphun Jino

Address: 333 Moo1, Thasud, Muang, Chiang Rai 57100

Organization : School of Agro-Industry, Mae Fah Luang University

Email : ask.library@mfu.ac.th

Name: Rittichai Assawarachan

keyword: Stevia leaves - Single-stage drying temperature - Multi-stage drying temperature - Color Quality

ThaSH: Food sciences

ThaSH: Agricultural industries

ThaSH: Stevia rebaudiana

ThaSH: Drying

ThaSH: Color

Abstract: The color of dried stevia leaves is an important component quality and primary consider ation of consumers when making purchasing decision. This study aimed to investigate an effect of single-stage drying temperature and multi-stage drying temperature on drying rate and color quality of dried stevia leaves. The drying conditions of single-stage drying tem perature are at 50, 60, 70, 80 and 90oC and multi-stage temperature for 80°C follows by 50°C and 90°C follows by 50°C. The drying rate of single-stage temperature required to reduce moisture content of stevia leaves from 5.23±0.41 to 0.075±0.003 gwater/gdry matter was 0.0018- 0.0179 gwater/gdry matter*min. Whereas the drying rate of multi-stage drying temperature was 0.0032 to 0.0076 gwater/gdry matter *min. It was found that multi-stage drying temperature pro vided the higher drying rate and color retention than that of single-stage drying tempera ture. The results of these tests suggest that multi-stage drying temperature provided better color quality of dried stevia leaves in terms of color. It was found that the suitable conditions for multi-stage drying temperature were 80oC for 30 min and 50oC for 730 min. The color qualities of dried stevia leaves for multi-stage drying temperature in CIELAB system namely L*, a*, b* and TCD were 54.15±1.83, -10.41±1.99, 18.97±1.47 and 5.01±0.84, respectively. In addition, the Chroma values (C*) and Hue angle (ho) were 39.19±3.11 and 108.84±4.39

Mae Fah Luang University. Learning Resources and Educational Media Center

Address: CHIANG RAI

Email: library@mfu.ac.th

Modified: 2021-11-15

Issued: 2021-11-15

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Journal of Food Science and Agricultural Technology (2015) Vol.1 (1): 83-88

eng

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