Abstract
The goal of this study was to point out the effect of parameters (solvent, solid to solvent ratio and extraction time) on the extraction of condensed tannins from Rosa canina feedstock, using conventional methods such as room temperature extraction (RTE) and heat reflux extraction (HRE). Moreover, the extraction kinetics behaviour for HRE has been extensively studied in order to foreshadow a scale up process. The second order rate model was applied to estimate the extraction kinetics of a conventional heat reflux extraction (HRE) at different solid to liquid ratios, concentrations of solvent extraction times. Results showed that the second order rate model was the rate-governing step of the extraction process, and the predicted and experimental data fits very well.
Highlights
Plants are rich in secondary metabolites such as alkaloids, steroids, glycosides, volatile oils, resins, phenolic acids, flavonoids and tannins, which are present in root, bark, branches, stems, leaves, flowers, fruits or seeds [1]
Influence of solvent concentration and solid to liquid ratio The solvent concentration and the solid to liquid ratio are two important parameters of extraction processes. The study of these two parameters performed on two conventional extraction methods heat reflux extraction (HRE) and room temperature extraction (RTE) revealed the TPC was significant influenced by the solvent concentration of (Figure 2) as well as by the solid to liquid ratio (Figure 3)
The comparative study shows that HRE method lead to higher concentrations of condensed tannins
Summary
Plants are rich in secondary metabolites such as alkaloids, steroids, glycosides, volatile oils, resins, phenolic acids, flavonoids and tannins, which are present in root, bark, branches, stems, leaves, flowers, fruits or seeds [1]. Any of these classes are of increasing interest due to their applications in pharmaceutical, nutritional, cosmetic, industrial or even environmental field. Polyphenols are known as antioxidants, antibacterial, anti-inflammatory, anti-diabetic and chelating agents [5]. The significant antioxidant activity of natural polyphenols is presumed to exert effects such as anti-carcinogenic, anti-mutagenic [6], and cardio-protective, linked to their free radical scavenging [7]. Polyphenols have an important influence on microorganisms [9] and on plant growth and development [10]
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