Fac-simile Scheda Linee di Ricerca - Federalimentare

Dati pubblicati inerenti il tema di ricerca:1. Piga A., Marchetti M., Usai M., Del Caro A., Meier H.P., Onorati V., Vinci F., 2007. Influenceof different drying parameters on the composition of volatile compounds of thyme androsemary cultivated in Sardinia. Proc.s 3 rd International Simposium CGIR, Naples, Italy, 24-26 September 2007, http://www.aidic.it/3CIGR/.The shelf life of spices is traditionally extended by drying. Fresh herbs, due to their high water content, undergomicroorganism growth and adverse biochemical reactions. On the other hand drying may result in a lot of physicaland chemical alterations. Air and oven-dehydration are the main methods used to stabilize spices. Duringoven drying, in general, losses of volatile compounds are directly dependent on the temperature and time used.This paper deals with the effect of different drying temperatures and air fluxes on the volatiles in rosemary(Rosmarinus officinalis L) and thyme (Thymus officinalis L.) cultivated in Sardinia. Fresh leaves were collectedand soon divided in two batches, which were subjected to hydro distillation and GC-MS analysis, the first batchas fresh, the second one after drying in a laboratory pilot dryer. Three drying temperatures were used, 30, 38 and45°C, and for each one two airflow rates were set. The fresh and dried plant material were hydro distilled for 4hours using a Clevenger-type apparatus (Italian Official Pharmacopeias X). The oils (liquid and light yellow)were recovered directly from above the distillate without adding any solvent and stored at –20°C before analyses,which were carried out on two replicates of each sample by gas chromatography, using a flame ionization detector.The diluted samples were injected using a split/splitless automatic injector (using 2,6-dimethylphenol asinternal standard). Qualitative analysis was done by GC/Mass and mass units were monitored from 10 to 450 at70 eV. Results of the influence of the different drying conditions on volatile compounds of the two herbs will bereported.SISTAL - SOCIETA’ ITALIANA DI SCIENZE E TECNOLOGIE ALIMENTARIDipartimento di Scienze e Tecnologie Agroalimentari, Università degli Studi della TusciaVia San Camillo de Lellis, 01100 ViterboTel.: 0761- 35 74 94/7 , Fax: 0761- 35 74 98, e-mail: mmoresi@unitus.it416