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Influence of storage time on the composition of volatile compounds of air dried, frozen and freeze dried thyme and rosemary cultivated in Sardinia

Foddai, Marzia and Usai, Marianna and Marchetti, Mauro and Del Caro, Alessandra and Desogus, Roberta and Sanna, Iser and Piga, Antonio <1965- > (2009) Influence of storage time on the composition of volatile compounds of air dried, frozen and freeze dried thyme and rosemary cultivated in Sardinia. Italian Journal of Food Science (Special Issue), p. 27-29. ISSN 1120-1770. Article.

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Abstract

This paper deals with the effect of different stabilizing techniques on the evolution of the volatiles in rosemary (Rosmarinus officinalis L.) and thyme (Thymus officinalis L.) cultivated in Sardinia during nine months of storage. Fresh leaves were collected and soon divided in four batches, which were subjected to hydro distillation and GC-MS analysis, the first batch as fresh, the second one after drying in a laboratory pilot dryer, the third after freezing in a forced air freezer and the fourth after freeze drying in a laboratory freeze dryer.
AlI the samples were adequately packaged and stored. Samples for analysis were taken at 3 months intervals. The fresh, stabilised and stored plant material were hydro distilled for 4 hours using a Clevenger-type. The oils were analysed in duplicate by gas chromatography, using a flame ionization detector. Qualitative analysis was done by GC /Mass and mass units were monitored from 10 to 450 at 70 eV.
Results of the evolution of volatile compounds of the differently samples seem to evidence that the best way to stabilize the herbs is freezing.

Item Type:Article
ID Code:5184
Status:Published
Refereed:Yes
Uncontrolled Keywords:Rosmarinus officinalis L., Thymus officinalis L., essential oils, stabilisation, storage
Subjects:Area 05 - Scienze biologiche > BIO/15 Biologia farmaceutica
Area 07 - Scienze agrarie e veterinarie > AGR/15 Scienze e tecnologie alimentari
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > CNR-Consiglio Nazionale delle Ricerche > Istituto di chimica biomolecolare, Sassari
001 Università di Sassari > 01 Dipartimenti > Scienze del farmaco
001 Università di Sassari > 01 Dipartimenti > Scienze ambientali agrarie e biotecnologie agro-alimentari
Publisher:Chiriotti Editori
ISSN:1120-1770
Publisher Policy:Depositato per gentile concessione dell'Editore
Additional Information:Poster presented at the "SLlM 2008, Shelf Life International Meeting", Ischia (Italy), June 25-27th 2008.
Deposited On:03 Dec 2010 18:18

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