Megawati, Megawati and Astrilia Damayanti, Teknik Kimia Unnes and Radenrara Dewi Artanti Putri, - and Irene Nindita Pradnya, - and Habib Faisal Yahya, - and Nurul Kumarani Arnan, - (2020) Drying Characteristics of Chlorella pyrenoidosa Using Oven and its Evaluation for Bio-Ethanol Production. Materials Science Forum, 1007. pp. 1-5. ISSN 1662-9752

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Abstract

The objective of this research is to study the influence of temperature on drying and changes in carbohydrate composition during the drying. Chlorella pyrenoidosa was dried in oven at various temperatures and initial weight 2 g. The initial moisture content of Chlorella pyrenoidosa was 487.2% dry weight and the composition was hemicellulose (62.76), cellulose (2.39), and lignin (0.46% dry weight). Every 5 min, the moisture content was recorded. The critical moisture contents of Chlorella pyrenoidosa at 50, 60, and 70 oC are 7.2, 3.9, and 3.1% dry weight, respectively. Meanwhile, the equilibrium water contents are 0.53, 0.32, and 0.12% dry weight, respectively. The carbohydrate content in Chlorella pyrenoidosa cell as a result FTIR analysis indicates that the higher temperature of drying the carbohydrate content increases. Drying of Chlorella pyrenoidosa at temperatures of 50, 60, and 70 oC will decrease moisture content without disturb carbohydrate molecule, so the carbohydrate content increases. Therefore, drying of Chlorella pyrenoidosa before converting become bio-ethanol will give benefit to increase the carbohydrate content and initial rupturing of it’s cell.

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