Abstract
Lippia citriodora has been demonstrated to have a wide variety of phytochemicals which provide benefits to human health acting as antioxidants or anti-obesogenics. In this study, these phytochemicals were recovered using a microwave-assisted technology and applying optimal conditions and microencapsulated using spray drying. In this study, two different carbohydrates, maltodextrin (MD) and inulin (IN), were compared as carriers in the encapsulation procedure. The spray drying process was optimized by using a response surface methodology (RSM) based on a central composite design 22, where air inlet temperature and the sample:encapsulating agent ratio (S:EA) were selected as independent variables. Both designs were analyzed equally to evaluate differences between each carrying agent on polar compounds’ encapsulation (process yield (Y%), encapsulation efficiency (EE%) and recovery of compounds (R%)) during the spray drying. The EE% and R% of each polar compound was monitored by High Performance Liquid Chromatography coupled to Time-of-Flight mass spectrometer by electrospray interface (HPLC-ESI-TOF-MS). The results showed that the use of IN as a carrier increased the powder recovered and the recovery of polar compounds after the spray dry process, whereas MD achieved a higher encapsulation efficiency.
Highlights
There is ongoing research into compounds that provide beneficial health effects
The aim of this research was to develop a technological encapsulation procedure to microencapsulate antioxidant compounds of an enriched extract of Lippia citriodora attained by microwave assisted extraction, with the purpose of maximizing process yield, degree of encapsulation of bioactive compounds, as well as their recovery after processing using maltodextrin and inulin as the wall materials
Liquid Chromatography- Mass Spectrometry (LC-MS) grade acetonitrile provided by Fisher chemicals (Waltham, MA, USA) whereas formic acid was provided from Sigma-Aldrich
Summary
There is ongoing research into compounds that provide beneficial health effects. Phenolic compounds, which are metabolites synthesized by plants with beneficial properties, have induced an increase in the development of foods with health promoting purposes [4,5]. Lippia citriodora or lemon verbena, is a plant native to South America whose phytochemicals have been demonstrated to provide antioxidant [6], anti-inflammatory [7] and anti-obesogenic effects, since they may take part in the modulation of some metabolic pathways [8,9,10]. Verbascoside and martynoside, are the phenylpropanoids which have demonstrated higher modulating AMPK (adenosine monophosphate-activated protein kinase) capacity. Some iridoids have been demonstrated to provide an activation of AMPK pathway [9,10]
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