Processing of Rosmarinus officinalis linne extract on spray and spouted bed dryers

Abstract

Received; March 09, 2006 ; Accepted: November 07, 2007) Abstract -This article presents an investigation of the potential of spray and spouted bed technology for the production of dried extracts of Rosmarinus officinalis Linné, popularly known as rosemary. The extractive solution was characterized by loss on drying, extractable matter and total phenolic and flavonoid compounds (chemical markers). The product was characterized by determination of loss on drying, size distribution, morphology, flow properties and thermal degradation and thermal behavior. The spray and spouted bed dryer performance were assessed through estimation of thermal efficiency, product accumulation and product recovery. The parameters studied were the inlet temperature of the spouting gas (80 and 150 o C) and the feed mass flow rate of concentrated extract relative to the evaporation capacity of the dryer, W s /W max (15 to 75%). The atomizing air flow rate was maintained at 20 l/min with a pressure of 196.1 kPa. The spouting gas flow rate used in the drying runs was 40% higher than the gas flow under the condition of minimum spouting. The spray drying gas flow rate was fixed at 0.0118 kg/s. Under the conditions studied, performance in the spray and spouted bed drying of rosemary extract was poor, causing high degradation of the marker compounds (mainly the phenolic compounds). Thus, process improvements are required before use on an industrial scale.

Thermal Degradation Kinetics of Kaempferol and Quercetin in the Pre-Formulated of the Standardized Extracts of Poincianella Pyramidalis (Tul.) L. P. Queiroz Obtained by Spray Dryer

“…Obtaining standardized plant extracts has been one of the major challenges for the development of herbal medicines, especially in Brazil, and the herbal industry has sought alternatives to solve this problem, one of which would be the production of standardized dried extracts of medicinal plants aiming establishment of quality control parameters for the vegetable raw material [17][18][19].…”

Protective Effect of Fermented Soybean Dried Extracts against TPA-Induced Oxidative Stress in Hairless Mice Skin

“…These results suggest that the phenolic compounds present in the HE might be degraded by the spray drying process independent of the employed drying parameters. Other studies also detected the degradation of polyphenols after spray drying and suggested that it may have been caused by oxidative condensation phenomena and decomposition of thermolabile compounds induced by in-process factors such as heating [11, 22, 23]. …”

Secagem por aspersão (spray drying) de extratos vegetais: bases e aplicações

“…A Figura 2 apresenta fotomicrografias de dois extratos diferentes de Maytenus ilicifolia secos por spray drying, com disco giratório em torre de secagem por aspersão. Os extratos foram produzidos da mesma maneira utilizando temperatura de entrada de 180 °C, velocidade do aspersor de 9500 rpm e 30% de Aerosil (Oliveira, 2008).…”