Study on retention of metabolites composition in misai kucing (orthosiphon stamineus) by heat pump assisted solar drying

• Main Authors: Gan, Shu Hui, Tham, Thing Chai, Ng, Mei Xiang, Chua, Lee Suan, Aziz, Ramlan, Baba, Mohamed Redza, Abdullah, Luqman Chuah, Ong, Sze Pheng, Law, Chung Lim
• Format: Article
• Published: Wiley Periodicals 2017
• Subjects: TP Chemical technology
• Online Access: http://eprints.utm.my/id/eprint/81327/; http://dx.doi.org/10.1111/jfpp.13262
• Institution: Universiti Teknologi Malaysia

In this research, the effects of different drying methods on the two biomarker compounds concentrations, such as sinensetin (SEN) and rosmarinic acid (RA) of Orthosiphon staminues Benth leaves, flowers, stems and mix were investigated. SEN and RA retention among the dehydrated samples were maximum 83.07% in leaves and 92.54% in flowers, respectively by heat pump assisted solar drying method. For heat pump assisted solar dried samples, there are no significant differences (p > .05) in the retention of SEN and RA as compared to fresh samples. However, there are significant differences (p < 0.05) in SEN and RA retention in solar dried leaves, flowers, stems and mix as compared to fresh samples. Besides, an optimization study was performed to evaluate the optimal drying conditions for obtaining high SEN yields from Misai Kucing's leaves, flowers, stems and mixes with high RA contents within the drying parameters.