Estimation of heavy metals in medicinal plants as a source of herbal medicine used in cardiovascular diseases.
Heavy metal analysis of Pb, Cd, Hg, Cu, Ni, Fe, Mn, Cr and As in medicinal plants is getting lot of scientific interest as these plants are used as an alternate form of medicine in different parts of the world (Abdul-Wahab et al., 2008; Kala, 2005; Katewa et al., 2004; Wong et al., 1993).
In the present study, T. arjuna, C. fistula and E. camaldulensis were used for heavy metals estimation as they are well recognized as medicinal plants used for cardiovascular diseases, (Nadkarni, 1976).
Collection and post harvest treatment of plant material. Experiment was carried out at PCSIR Laboratories, Lahore. Plants were collected from natural habitat of PCSIR vicinity. Each type of medicinal plant species was collected from 10 sampling sites (locations). Result reported was arranged for all 10 samples within an area of approximately one square kilometer to get better sampling representation. Samples were washed in fresh running water to eliminate dust, dirt and possible parasites, and then treated with deionized water. Each demoisturized plants sample was crushed in an agate mortar as fine as possible and analyzed three times.
Acid digestion of plant samples. About 1 g of crushed and powdered portion from each part of plants i.e. leaves, bark, fruit and twig in a crucible form were heated in an oven at 110 [degrees]C to remove moisture. The dried samples were charred and then heated in a furnace for 4hat 550[degrees]C. The contents of crucible were cooled in desiccator and 5 mL concentrated HN[O.sub.3] was added into the dish to dissolve its contents. The solution was filtered and transferred to a 100 mL flask and diluted up to the mark (Radojevic, 1999). Estimation of heavy metals was carried out on atomic absorption spectrometer, Analyst 800 (Perkin Elmer).
Reagents. All reagents were of analytical reagent grade and high purity distilled water was used for making the solutions. It has been reported that at least 31 elements can be linked to cardio vascular disorders (Vohora, 1983).
Three plants E. camaldulensis, C. fistula and T. arjuna were selected for this study because of their medicinal values. The concentrations of Zn, Cu, Mg, Mn and Cr in selected medicinal plants have been shown in Table 1.
Metals composition of T. arjuna. The T. arjuna locally known as 'kumbuck' belongs to the family Combretaceae (Sarveswaran et al., 2006). T. arjuna is a large deciduous tree with a height of about 60 to 80 feet and trunk 10 to 12 feet circumference. It has leaf 3 to 8 inches broadly elliptic, cuneateat base and clustered at the ends of branchlets (Kapoor, 2005).
Metal composition of T. arjuna shows that its fruit is very rich in Cu (18.248 mg/100 g) and Mg (0.417 mg/ 100 g) as shown in Table 1 and its bark contains maximum Cr as compared to other selected medicinal plants shown in (Fig. 1). Copper (Cu) is an essential enzymatic element for normal plant growth and development but can be toxic at excessive levels higher than 20-100 ppm dry weight (DW). The Mg concentration in its bark is 0.9602 mg/100 g. The zinc concentration in fruit of T. arjuna is very high as compared to E. camaldulensis and C.fistula as shown in (Fig. 2).
Metals composition of C.fistula. C.fistula is a small to medium sized tree with compound leaves and large shining, dark green leaflets and 50 to 60 cm long cylindrical fruit. Its flowers are bright yellow in colour, drooping racemes, 30-60 cm long; shortly clawed petals to 3.5 cm across; stamens 10, upper three with erect filaments to 0.7 cm long. (Orwa et al., 2009). Heavy metals analysis of C.fistula shows that Zn and Cu were not detectable in all parts of the plant. However, Mg concentration was remarkable as shown in Fig. 3. Its twig is very rich in Cr (0.1248 mg/100 g) and very low amount of Mn (0.0035 mg/100 g). Its fruit contain maximum concentration of Mn as shown in Fig. 4. Chromium intake of 30 mg to 40 mg/day would likely be adequate if well balanced diets were consumed (Anderson, 1993).
The leaves of C. fistula tree are helpful in relieving irritation of the skin and in alleviating swellings and pains. Its pulp is an effective laxative and is used in the treatment of constipation. Its bark extracts possess significant anti-inflammatory and anti-oxidant properties (Raju et al., 2005).The root of the C.fistula tree is a tonic and useful in reducing fever.
Metals composition of E. camaldulensis. Heavy metals analysis of E. camaldulensis shows that its fruit is very rich in Mg (1.4772 mg/100 g), Zn (0.1872 mg/100 g) and Cr (0.0985 mg/100 g). Leaves contain maximum content of Mn as compared to T. arjuna and C.fistula as shown in Fig. 4. Mg content in its leaf, bark and twig are remarkable, as shown in Fig. 3.
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High Cr contents were observed in T. arjuna bark (0.3480 mg/100 g). High Mn concentration was found inE. camaldulensis leaf as the 1.4654 mg/100 g whereas E. camaldulensis fruit contains high Mg concentration that is 1.4772 mg/100 g. Present study shows that the selected medicinal plants have been utilized in synthesis of herbal medicines for heart and liver diseases and tonic for general human health.
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Farah Deeba, Naeem Abbas * and Rauf Ahmed
Center for Environmental Protection Studies, PCSIR Laboratories Complex, Ferozepur Road, Lahore-54600, Pakistan
(received February 19, 2011; revised June 29, 2012; accepted July 15, 2012)
* Author for correspondence; E-mail: email@example.com
Table 1. Heavy metal concentration in plant samples on dry basis Plant species Plant Zn Cu Mg part (mg/100 g) T. arjuna Fruit 2.2019 18.248 0.417 Leave N.D N.D 0.6171 Bark N.D N.D 0.9602 twig 0.2543 0.1696 1.0164 E. camaldulensis Fruit 0.1872 N.D 1.4772 Leave 0.3993 0.1962 1.2852 Bark 0.0062 0.0456 1.055 twig 0.0828 0.2123 0.7766 C. fistula Fruit N.D N.D 0.3480 Leave N.D N.D 0.2729 Bark N.D N.D 0.1922 twig N.D N.D 0.5441 Plant species Plant Mn Cr part (mg/100 g) T. arjuna Fruit 0.0746 0.0246 Leave 0.0091 0.1594 Bark 0.0377 0.3480 twig 0.3931 0.1304 E. camaldulensis Fruit 0.4169 0.0985 Leave 1.4654 0.1212 Bark 0.2216 0.0406 twig 0.3241 0.0248 C. fistula Fruit 0.0061 0.0193 Leave N.D 0.1075 Bark 0.0102 0.0941 twig 0.0035 0.1248 N.D = Not-detectable
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|Title Annotation:||Short Communication|
|Author:||Deeba, Farah; Abbas, Naeem; Ahmed, Rauf|
|Publication:||Pakistan Journal of Scientific and Industrial Research Series B: Biological Sciences|
|Date:||Nov 1, 2012|
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