The Journal "Agriculture and Forestry"
Časopis "Poljoprivreda i šumarstvo"
- Since 1955 -
Year 2018, Volume 64 Issue 4 (15.12.2018)
| Year : | 2018 |
| Volume : | 64 |
| Issue : | 4 (15.12.2018) |
| Authors : | Nayer MOHAMMADKHANI and Jila ABBASZADEH |
| Title : | EFFECTS OF DRYING AND EXTRACTION METHODS ON ANTIOXIDANT PROPERTIES OF HORSEMINT (Mentha longifolia L.) |
| Abstract : | Mentha longifolia has the widest natural geographic distribution of any menthe species, from Western Europe to central Asia and in southern Africa. The current study was conducted to determine the antioxidant capacity of extracts and essential oil taken from aerial portions of M. longifolia L. The plant materials were dried by three different techniques (shade, sun and oven drying). Collected horsemint shoots were grinded then for evaluating effect of different extraction methods (maceration by aqueous, ethanolic and hydroalcoholic solvents, soxhlet and essential oil by Clevenger) and drying technique (shade drying, sun drying and oven drying) were used. Total phenol content (TPC) and total flavonoid content (TFC) of the samples were measured. Furthermore, total antioxidant capacity (TAC) was evaluated by both phosphomolybdenum and DPPH% assays. Soxhlet extraction of shade drying had highest TPC and TFC among other extracts a drying methods. In terms of antioxidant activity, essential oil obtained from Clevenger displayed high antioxidant capacity, resulting in a higher radical scavenging ability, which can be attributed to the lower temperatures in shade dried plant material and the higher stability of the extracted compounds. But by exposure the shoots to sun or high temperature (oven) decreasing of bioactive compounds amounts present in plant material were observed. There was a significantly positive correlation (P<0.01, r>0.7) between TPC and TFC in all drying techniques. Also a significant correlation was observed between TAC and %inhibition (P0.01, r>0.8) in sun drying extracts. Extraction and drying the herbal material influences the bioactive compounds and antioxidant properties. |
| For citation : | Mohammadkhani, N., Abbaszadeh, J. (2018): Effects of drying and extraction methods on antioxidant properties of horsemint (Mentha longifolia L.). Agriculture and Forestry, 64 (4): 219-234. DOI:10.17707/AgricultForest.64.4.22 |
| Keywords : | Mentha longifolia L., extraction, antioxidant capacity, drying, total phenol content |
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