Phytochemical and Biological Evaluation of Ultrasound-Assisted Spray Dried Lonicera etrusca for Potential Management of Diabetes
Karim M. Raafat and Wael Samy
Department of Pharmaceutical Sciences, Faculty of Pharmacy, Beirut Arab University, 115020 Beirut, Lebanon
Department of Industrial Pharmacy, Faculty of Pharmacy, Alexandria University, 21521 Alexandria, Egypt
Abstract: Honeysuckle or Lonicera etrusca is one of the important medicinal-plants that is traditionally-used as a potential antioxidant. The aim of this work was to make a phytochemical-evaluation of Lonicera etrusca ultrasound-assisted spray-dried extract versus conventional-method utilizing RP-HPLC aided-method in the potential management of diabetes. Ultrasound-assisted spray-drying (US-SD) is a new productive-technique aiming at increasing the efficiency and extract-yield in addition to short time of exposure to elevated temperature thus improving product stability. A bio-guided study utilizing RP-HPLC, 1H and 13C NMR methods indicated that the most active antidiabetic-compound was isochlorogenic acid (ICA). Diabetes measurement utilizing glucometers and HbA1c methods was applied. Serum-insulin levels and serum-catalase (CAT) was also monitored. The US-SD preserved time by 4 folds and with higher yield (ca. 20%) than the conventional method. The US-SD also had higher quality in US-SD honeysuckle (HS-sd) constituents than the conventional method as supported by RP-HPLC analysis. Rotary evaporated honeysuckle (HS-r) major peaks identified were; chlorogenic acid (38.6%), caffeic acid (5.8%), isochlorogenic acid (36.1%), luteolin-7-O-glucoside (3.3%), and quercetin (3.0%). HS-sd major peaks identified were; chlorogenic acid (40.5%), caffeic acid (6.4%), isochlorogenic acid (43.3%), luteolin-7-O-glucoside (3.5%), and quercetin (3.2%). HS-sd had significant (p˂0.05, n=7/group) antidiabetic-activity more than HS-r. HS-sd had more-significant dose-dependent increase in serum-insulin, CAT-levels and body-weights more prominent than HS-r. Compared to conventional-methods, US-SD has shown to be time-conserving, efficient, and active-ingredients preserving method. The antidiabetic-potentials of HS-sd and ICA were probably mediated via the significant insulin-secretagogue effect and the attenuation glucose-provoked oxidative-stress.
Keywords: Lonicera etrusca ; isochlorogenic acid; ultrasound-assisted spray drying; RP-HPLC; diabetes. © 2018 ACG Publications. All rights reserved.