Characterization of Malaria Preventive Extracts from Myrsine africana Seeds

Introduction:The use of pharmaceutical anti-malaria drugs in many rural areas is not common. Various plant extracts have been used as anti-plasmodial agents.Myrsine africanaseed extracts are common anti-malaria agents amongst the Maasai community of Kenya.Aims:This study aimed at characterizing the chemical constituents of methanolic, aqua and n-hexane extracts of Myrsine africana seeds. Study Design:An independent measures design was used.Methodology:The extracts were obtained by maceration of the seeds before subjecting to physical-chemical analysis, functional groups, bio-metal concentrations and phytochemicals screening. Antibacterial studies were conducted using E. coliand S. aureus. The extracts were thereafter screened for presence of quinine and chloroquine by UV VIS spectroscopy. Results:The results indicated the extracts were weakly acidic with moderate solid content. The FT-IR peaks of the extracts indicated abundance of carboxylic acids and benzylic groups. The extracts had a moderate iron concentration with mild copper, cobalt and zinc concentrations. The extracts were also rich in tannins, phenols, saponins, alkaloids and steroids. The antibacterial proficiency of both stains used increased with concentration of extracts and were highest at 50.0mg/mL. Methanolic and water extracts of the seeds also showed appreciable quinines and chloroquinines concentrations. Conclusions:M. africanaseed methanolic and water extracts can be used as anti-plasmodial drugs to help curb malaria in rural tropical regions

Phytochemical Analysis and Antiplasmodial (curative) Activities of Methanolic Leaf Extract of Morinda lucida (Ewe Oruwo) in Male Swiss Mice Infected with Plasmodium berghei NK65

Aim:Medicinal plants have been used for the treatment of many infections and diseases including malaria. The study was conducted to determine the effect of in vivoanti-plasmodialand antioxidant properties of the methanolic leaf extract of Morinda lucidain male Swiss albino mice infected with Plasmodium Berghei NK65. Study Design and Methodology:Phytochemical, GC-MS and AAS analyses were determined in the plant. Swiss albino mice were inoculated intraperitoneally with Plasmodium bergheiNK65. Thirty-five (35) mice were grouped into seven groups, five per group. Group A were not infected with P.bergheiNK65.Group B, C and D served as the negative and positive control groups while Group E, F and G mice were treated with 400, 600 and 800 mg/kg body weight of methanolic leaf extract of M. lucida. Haematological parameters were determined in the whole blood using BC-3200 Auto Hematology Analyzer. TP, MDA, CAT, SOD % inhibition, SOD unit and vitamin A were all determined in the liver homogenateusing standard procedures.Results:The GC-MS result of the M. lucidashows the presence of five bioactive compounds. It was also observed that the plant contains the following minerals: iron, magnesium, potassium, phosphorus and copper. Acute toxicity shows that the LD50>000mg/Kg b.wt. The extract caused 30.96%, 32.93% and 67.23% reduction in parasitemia at 400, 600 and 800 mg/kg body weight respectively while chloroquine exerted 96.53% and artesunate exerted 92.03% reduction at 10 mg/kg body weight respectively. The Haematological parameters showed that the plant extractis nothaematotoxic since it significantly (P<0.05) reduced WBC count, and increase RBC, HGB, and HCT values in the treated mice compared to the infected untreated mice. This study shows that the mean lipid peroxidation (MDA) level was significantly decreased in the malaria treated mice (group C, D, E, F and G) compared to the untreated mice (group B). There was also a significant increase in the total protein, catalase, SOD % inhibition, SOD unit and Vitamin A levels in the liver homogenate of animals treated with chloroquine, artesunate and extract of M. lucidacompared to the untreated mice. Conclusions: The study shows that Morinda lucidapossess antiplasmodial activity in male Swiss mice infected with Plasmodium berghei NK 65.

In vivo Anti-plasmodial Activity of Crude Extracts of Three Medicinal Plants Used Traditionally for Malaria Treatment in Kenya

The aim of the study was to determine the in vivo anti-plasmodial activity of three plants Rhamnus prinoides, Rubus keniensis and Garcinia buchananii which are used for malaria treatment by indigenous communities in Kenya. This work was done at the Department of Biological and Preclinical studies, Institute of Traditional Medicine, Muhimbili University of Health & Allied Sciences in October 2016 to August 2017. Male and female albino mice were infected with Plasmodium berghei (ANKA) in the Peter’s four day suppression test. Five groups of mice; Group 1 (solvent: 5 mL/kg body weight of 1% carboxymethyl cellulose), Group 5 (10 mg/kg body weight chloroquine), Groups 2, 3 and 4 were given 200, 400 and 800 mg/kg body weight of plant extracts. The results showed that 5% aqueous methanol extracts of R. prinoides, G. buchananii and R. keniensis exhibited higher anti-plasmodial activity than the 1:1 dichloromethane: methanol extracts in the preliminary testing. The doses showing 50% parasite suppression (EC50) were 139.2, 169.4 and 245.1 mg/kg body weight for R. prinoides, G. buchananii and R. keniensis, respectively. In vivo anti-plasmodial activity of the three plants has supported the traditional use of extracts of Rhamnus prinoides, Rubus keniensis and Garcinia buchananii for treatment of malaria. Isolation of compounds from these plants is in progress.

Anti-plasmodial Activity of Bee Sting in Plasmodium berghei Infected Mice.

Aim: Based on traditional claims and practice, the antiplasmodial activity of bee stings and its effect on haematological indices was investigated in P. berghei infected mice. Methodology: Sixteen albino mice were intraperitoneally infected with chloroquine sensitive P. berghei strain and divided into four groups each consisted of four animals. Group I was set up as negative control of 0.2 ml normal Saline/kg body weight, group II as 5 mg chloroquine/kg body weight, group III had suppressive treatment and group IV was administered curative treatment. The thin blood smear was used to determine the parasiteamia counts and the haematological parameters were estimated on day 7. Results: The result of percentage chemosuppression shows that bee stings suppress the parasitaemia to 56.6%. Also, the suppressive and curative groups show longer mean survival period of 15.0 and 20.0 respectively. The haematological studies show that the level of packed cell volume (PCV) and haemoglobin concentration (HB) of infected untreated group was significantly (p<0.05) lower when compare with all other experimental groups, where as chloroquine treated group shows significant increase compared to the bee treated groups. The Red blood cell (R.B.C.) counts was significantly (p<0.05) lowered in infected untreated group when compare with suppressive and chloroquine treated groups. However the white blood cell (WBC) counts was significantly (p<0.05) higher in infected bee sting treated when compare to the infected untreated and infected chloroquine treated groups. Conclusion: Based on the result obtained, this study confirms the antiplasmodial activity of bee stings and suggests its potential as drug agent or lead against malaria.

In vitro Anti-plasmodial Activity of Rubia cordifolia, Harrizonia abyssinica, Leucas calostachys Olive and Sanchus schweinfurthii Medicinal Plants.

Plasmodium falciparum is becoming increasingly resistant to conventional antimalaria drugs. Rapid increase of parasite resistant strains, resistance of the vector to insecticides and the difficulty in creating efficient vaccines has lead to an urgent need for new anti-malarial drugs. To determine anti-plasmodial activity of Rubia cordifolia, Harrizonia abyssinica, Sachus schweinfurthii and Leucas calostachys Olive plants. Aqueous and methanolic crude extracts were prepared from R. cordifolia, H. abyssinica, S. schweinfurthii and L. calostachys plants. The extracts were then prepared into appropriate concentrations for anti-plasmodial activities. In vitro anti-plamsodial activities of herbal drugs were analysed according to the methods of Tona et al., 1999. Methanolic extracts were more efficacious than aqueous extracts. S. schweinfurthii and L. calostachys had IC50 (Inhibition Concentration) of between 1.10μg/ml and 3.45μg/ml and had highest parasite inhibition ranging between 3.5% and 5.2%. R. cardifolia and H. abyssinica had IC50 of between 1.5μg/ml and 3.0μg/ml and it had moderate parasitaemia ranging between 5.20% and 7.22%. Vernonia lasiopa and Erythrina abysinnica had insufficient yields. S. schweinfurthii and L. calostachys had the highest parasite inhibition while R. cardifolia and H. abyssinica had moderate inhibition.