ISHS Acta Horticulturae 503: II WOCMAP Congress Medicinal and Aromatic Plants, Part 4: Industrial Processing, Standards & Regulations, Quality, Marketing, Economics
A STUDY OF DIFFERENT FORMULATIONS OF WALL SUPPORT SYSTEMS FOR MICROENCAPSULATION OF ANTIOXIDANT ESSENTIAL OILS |
| Authors: | A.D. Gascon, C.A. Zuritz, J.A. Bustamante, L. de Borbon, G. Oberti |
| Keywords: | Essential oils, microencapsulation, spray-drying |
| Abstract:
Essential oils from native plants cultivated in Mendoza, Argentina are reported as having antioxidant properties on lipids. Examples of these plants are rosemary (Rosmarinus officinalis), “jarilla mendocina” (Larrea sp.), “tomillo mendocino” (Acantholippia seriphioides), origanum (Origanum vulgare), tarragon (Artemisia sp.), lavandins (Lavandula sp.) and eucalyptus (Eucalyptus sp.). The objective was to solve the problem of volatility and stability that these essential oils exhibit during handling and storage. The essentials oils were extracted by vapor stripping and then emulsified with different formulations of water suspensions of wall support systems (Arabic gum; Maltodextrin, Food Grade; and Cellulose microcrystalline, Food Grade) using both, a hand-held propeller-blender and a high pressure double-effect homogenizer working at inlet and exit pressures of 20.26 and 10.13 MPa, respectively. The microencapsulation of the essential oils was achieved by drying the emulsions in a spray-dryer Niro-Atomizer Minor, operated at a rotor speed of 24,000 r.p.m., and inlet and outlet drying temperatures of 180°–200°C and 90°–95°C, respectively. The wall support-essential oil emulsions studied were: (I) 60% water, 30% arabic gum and 10% essential oil; (II) 60% water, 20% arabic gum, 10% maltodextrin and 10% essential oil; (III) 60% water, 10% arabic gum, 20% maltodextrin and 10% essential oil; (IV) 60% water, 30% maltodextrin and 10% essential oil; and (V) 60% water, 10% arabic gum, 20% Cellulose microcrystalline and 10% essential oil. Essential oil retention values (entrapment) in the powders ranged from a high of 87.5% with formulation (I), to a low of 34.7% with formulation (V). The final moisture content of the powders was between 3.60% and 4.00% and they exhibited good flowability and low degree of hygroscopicity. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
