The physicochemical and structural characteristics of cultivated salep

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Abdullah Kurt Talip Kahyaoglu

Abstract

Salep is obtained from tubers of orchids which grown in mediterranean countries, especially in Turkey. The main polysaccharide content of salep is glucomannan. As hydrocolloid, it is used  for preparing hot drink and ice cream as stabilizer. However, orchid plants are damaged and sold with high priced. Therefore, searching of alternative production methods of salep are in progress. The important and favorable development for salep production was revealed by Aegean Agricultural Research Institue with the project of -the growing possibilities of salep orhids at farm conditions (cultivation)-. Salep tubers was obtained with a high yield with mentioned project. In our studies, the naturally grown salep which belongs to Serapias vomeracea and Orchis sancta  species compared with cultivated products of them. The main constituents glucomannan and starch, protein, cellulose, lignin were determined in the physicochemical analyses part. In addition, molecular weight, fourier infrared spectroscopy (FTIR), XRD, scanning electron microscopy (SEM), particle size and thermal analysis (DSC and TGA) were conducted for the structural charazterization. The tubers were obtained from Serapias vomeracea exhibited higher similarity in physicochemical properties with naturally grown one than Orchis sancta. Rheological experiments showed that samples have newtonyen flow. FTIR experiments which provide knowledge about chemicals bonds in structure revealed that cultivation studies did not vary of salep chemical structure. Amorph structure was determined with the XRD experiment for all samples. The variation of surface morphology of salep was observed with the cultivation by SEM. DSC and TGA analysis exhibited that samples had similar termal stabilities. The results obtained in this study showed that salep with the same physicochemical and structural characteristics with naturally grown could be achived by cultivation. The development and widening in this production method  provides both protection of wild orhids and cheaper salep production.

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Section
Sending to International Journal of Secondary Metabolite