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Subcritical water extraction of functional ingredients and glycoalkaloids from potato peel Open Access


Other title
Extraction, Subcritical water, Potato peel, Phenolic compounds, Chlorogenic acid, Gallic acid
Type of item
Degree grantor
University of Alberta
Author or creator
Singh, Pushp
Supervisor and department
Saldana, Marleny (Agricultural, Food and Nutritional Science)
Examining committee member and department
Guigard, Selma (Environmental Engineering)
Schieber, Andreas (Agricultural, Food and Nutritional Science)
Department of Agricultural, Food and Nutritional Science

Date accepted
Graduation date
Masters of Science
Degree level
Potato peel, a waste generated from potato processing is a disposal problem. But, it is a good source of phenolic compounds, sugars, and glycoalkaloids. This study examines the subcritical water extraction of phenolics, glycoalkaloids and sugars from potato peel and compares it to conventional solvent extraction. Experiments were conducted in a batch stainless steel reactor at 6 MPa, 2 mL/min and 100 to 240˚C for 30-120 min. The results revealed that highest recoveries of phenolic compounds (81.23 mg/100 g; fw) and sugars (75 mg/g; fw) were obtained using subcritical water at 180°C and 30 min and at 160°C and 120 min, respectively. Low content of glycoalkaloids (1.19 mg/100 g, fw) was obtained using subcritical water. The yields of phenolics and sugars using subcritical water were 40 and 45% higher than using a conventional solvent extraction method. Therefore, subcritical water might be a good substitute to organic solvents such as methanol and ethanol to obtain functional ingredients from potato peel.
License granted by Pushp Singh ( on 2011-01-31T21:16:13Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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