Subcritical water extraction of flavoring and phenolic compounds from cinnamon bark (Cinnamomum zeylanicum).
Cinnamon bark (Cinnamomum zeylanicum) powder was treated with subcritical water at 150 and 200°C in a semi-continuous system at a constant flow rate (3 mL/min) and pressure (6 MPa). Major flavoring compounds, i.e., cinnamaldehyde, cinnamic acid, cinnamyl alcohol and coumarin, were extracted at lower recoveries than the extraction using methanol, suggesting that degradation of these components might occur during the subcritical water treatment. Caffeic, ferulic, p-coumaric, protocatechuic and vanillic acids were identified from the subcritical water treatment. Extraction using subcritical water was more effective to obtain these acids than methanol (50% v/v) in both number of components and recovery, especially at 200°C. Subcritical water treatment at 200°C also resulted in a higher total phenolic content and DPPH radical scavenging activity than the methanol extraction. The DPPH radical scavenging activity and total phenolic content linearly correlated but the results suggested that the extraction at 200°C might result in other products that possessed a free radical scavenging activity other than the phenolic compounds.
Department of Food Technology, Faculty of Engineering and Industrial Technology, Silpakorn University, Amphoe Mueang, Nakhon Pathom, Thailand. kpramote@su.ac.th
Pramote
P
Khuwijitjaru
Nucha
N
Sayputikasikorn
Suched
S
Samuhasaneetoo
Parinda
P
Penroj
Prasong
P
Siriwongwilaichat
Shuji
S
Adachi
D000975:Antioxidants / Q000494:pharmacology; D001713:Biphenyl Compounds / Q000494:pharmacology; D002623:Chemistry Techniques, Analytical; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D002935:Cinnamomum zeylanicum / Q000378:metabolism*; D004867:Equipment Design; D016166:Free Radical Scavengers / Q000737:chemistry; D007700:Kinetics; D009930:Organic Chemicals / Q000737:chemistry; D019800:Phenol / Q000737:chemistry*; D010851:Picrates / Q000494:pharmacology; D024301:Plant Bark / Q000737:chemistry; D010936:Plant Extracts; D015203:Reproducibility of Results; D012997:Solvents / Q000737:chemistry; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry*
D000975:Antioxidants; D001713:Biphenyl Compounds; D016166:Free Radical Scavengers; D009930:Organic Chemicals; D010851:Picrates; D010936:Plant Extracts; D012997:Solvents; D014867:Water; D019800:Phenol; C004931:1,1-diphenyl-2-picrylhydrazyl