Paul Chidoka Chikezie

Membrane stability of sickle erythrocytes incubated in extracts of three medicinal plants: Anacardium occidentale, Psidium guajava, and Terminalia catappa

Background: Many reports showed that medicinal plant extracts cause alterations on the shape and physiology of erythrocytes. Objective: The present study seeks to ascertain the osmotic stability of sickle erythrocytes incubated in aqueous extracts of Anacardium occidentale, Psidium guajava, and Terminalia catappa. Materials and Methods: The fraction of erythrocytes lysed when suspended in saline solution of varying concentrations was investigated by spectrophotometric method. The percentage hemolysis of erythrocytes in the control and test samples showed a sigmoidal relationship with increasing concentrations of saline solution. Membrane stability was ascertained as mean corpuscular fragility (MCF) index of erythrocytes incubated in 400 and 800 mg/dL aqueous concentrations of the three plant extracts. Results: The two experimental concentrations of P. guajava and T. catappa protected the erythrocytes against osmotic stress, as evidenced by decreases in the values of MCF compared with the control sample (P < 0.05). However, 800 mg/dL of A. occidentale promoted significant (P < 0.05) distabilization of sickle erythrocytes. Conclusion: Whereas the two experimental concentrations of aqueous extracts of P. guajava and T. catappa stabilized erythrocyte membrane, higher concentration (800 mg/dL) of A. occidentale exhibited no membrane protective effect.

Overview of Anti-Diabetic Medicinal Plants: The Nigerian Research Experience

Medicinal plants have been used since ancient times for the treatment and management of diabetic mellitus (DM) in traditional medicine systems of many cultures throughout the world. Recently, the World Health Organization (WHO) recommended the use medicinal plants for the management of DM and further encouraged the expansion of the frontiers of scientific evaluation of the hypoglycemic properties of diverse plant species. Accordingly, the hypoglycemic activity of a vast number of plant products have been evaluated and confirmed in animal models as well as in human beings. In some cases, the bioactive principles of the medical plants have been isolated and identified. In order to harness these natural resources and maximize the socioeconomic benefits derivable from Nigerian medicinal plants efforts should be geared toward research funding and deployment of Research and Development (R & D) policy framework into medicinal plants research endeavours.

Cyanide and aflatoxin loads of processed cassava (Manihot esculenta) tubers (Garri) in Njaba, Imo state, Nigeria

Objectives: The present study sought to investigate the role of palm oil, in conjunction with the duration of fermentation, on cyanide and aflatoxin (AFT) loads of processed cassava tubers (Garri). Materials and Methods: Matured cassava (Manihot esculenta Crantz) tubers were harvested from three different locations (Akunna, Mkporo-Oji and Durungwu) in Njaba Local Government Area, Imo State, Nigeria. The cassava tubers were processed into Garri according to standard schemes with required modifications and measured for cyanide content using titrimetric methods. Samples of Garri for determination of AFT levels were stored for 30 days before the commencement of spectrophotometric analysis. Results: Cyanide content of peeled cassava tubers was within the range of 4.07 ± 0.16-5.20 ± 0.19 mg hydrocyanic acid (HCN) equivalent/100 g wet weight, whereas the various processed cassava tubers was within the range of 1.44 ± 0.34-3.95 ± 0.23 mg HCN equivalents/100 g. For the 48 h fermentation scheme, Garri treated with palm oil exhibited marginal reduction in cyanide contents by 0.96%, 3.52% and 3.69%, whereas 4 h fermentation scheme is in concurrence with palm oil treatment caused 4.42%, 7.47% and 5.15% elimination of cyanide contents compared with corresponding untreated Garri samples (P > 0.05). Levels of AFT of the various Garri samples ranged between 0.26 ± 0.07 and 0.55 ± 0.04 ppb/100 g. There was no significant difference (P > 0.05) in AFT levels among the various samples in relation to their corresponding sources. Conclusion: The present study showed that the 48 h fermentation scheme for Garri production caused significant (P < 0.05) reduction, but did not obliterate the cyanide content of cassava tubers. Conversely, the 48 h fermentation scheme promoted the elevation of AFT levels, but was relatively reduced in Garri samples treated with palm oil.

Sodium metabisulfite-induced polymerization of sickle cell hemoglobin incubated in the extracts of three medicinal plants (Anacardium occidentale, Psidium guajava, and Terminalia catappa).

Background: The exploitation and utilization of vast varieties of herbal extracts may serve as alternative measures to deter aggregation of deoxygenated sickle cell hemoglobin (deoxyHbS) molecules. Objective: The present in vitro study ascertained the capacity of three medicinal plants, namely, Anacardium occidentale, Psidium guajava, and Terminalia catappa, to alter polymerization of HbS. Materials and Methods: Spectrophotometric method was used to monitor the level of polymerization of hemolysate HbS molecules treated with sodium metabisulfite (Na2 S2 O5) at a regular interval of 30 s for a period of 180 s in the presence of separate aqueous extracts of A. occidentale, P. guajava, and T. catappa. At time intervals of 30 s, the level of polymerization was expressed as percentage of absorbance relative to the control sample at the 180th s. Results: Although extracts of the three medicinal plants caused significant (P < 0.05) reduction in polymerization of deoxyHbS molecules, the corresponding capacity in this regard diminished with increase in incubation time. Aqueous extract of P. guajava exhibited the highest capacity to reduced polymerization of deoxyHbS molecules. Whereas at t > 60 s, extract concentration of 400 mg% of A. occidentale activated polymerization of deoxyHbS molecules by 6.23±1.34, 14.53±1.67, 21.15±1.89, and 24.42±1.09%, 800 mg% of T. catappa at t > 30 s gave values of 2.50±1.93, 5.09±1.96, 10.00±0.99, 15.38±1.33, and 17.31±0.97%. Conclusion: The capacity of the three medicinal plants to interfere with polymerization of deoxyHbS molecules depended on the duration of incubation and concentration of the extracts.

Blood glucose level and lipid profile of alloxan-induced hyperglycemic rats treated with single and combinatorial herbal formulations.

The current study sought to investigate the capacities of single and combinatorial herbal formulations of leaf extracts of Acanthus montanus, Asystasia gangetica, Emilia coccinea, and Hibiscus rosasinensis to reverse hyperglycemia and dyslipidemia in alloxan-induced diabetic male rats. Phytochemical composition of the herbal extracts, fasting plasma glucose concentration (FPGC), and serum lipid profile (SLP) of the rats were measured by standard methods. The relative abundance of phytochemicals in the four experimental leaf extracts was in the following order: flavonoids > alkaloids > saponins > tannins. Hyperglycemic rats (HyGR) treated with single and combinatorial herbal formulations showed evidence of reduced FPGC compared with the untreated HyGR and were normoglycemic (FPGC < 110.0 mg/dL). Similarly, HyGR treated with single and combinatorial herbal formulations showed evidence of readjustments in their SLPs. Generally, HyGR treated with triple herbal formulations (THfs) exhibited the highest atherogenic index compared with HyGR treated with single herbal formulations (SHfs), double herbal formulations (DHfs), and quadruple herbal formulation (QHf). The display of synergy or antagonism by the composite herbal extracts in ameliorating hyperglycemia and dyslipidemia depended on the type and number of individual herbal extract used in constituting the experimental herbal formulations. Furthermore, the capacities of the herbal formulations (SHfs, DHfs, THfs, and QHf) to exert glycemic control and reverse dyslipidemia did not follow predictable patterns in the animal models.

Radical scavenging potentials of single and combinatorial herbal formulations in vitro

Reactive oxygen and nitrogen species (RONS) are involved in deleterious/beneficial biological processes. The present study sought to investigate the capacity of single and combinatorial herbal formulations of Acanthus montanus, Emilia coccinea, Hibiscus rosasinensis, and Asystasia gangetica to act as superoxide radicals (SOR), hydrogen peroxide (HP), nitric oxide radical (NOR), hydroxyl radical (HR), and 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical antagonists using in vitro models. The herbal extracts were single herbal formulations (SHfs), double herbal formulations (DHfs), triple herbal formulations (THfs), and a quadruple herbal formulation (QHf). The phytochemical composition and radical scavenging capacity index (SCI) of the herbal formulations were measured using standard methods. The flavonoids were the most abundant phytochemicals present in the herbal extracts. The SCI50 defined the concentration (μg/mL) of herbal formulation required to scavenge 50% of the investigated radicals. The SHfs, DHfs, THfs, and QHf SCI50 against the radicals followed the order HR > SOR > DPPH radical > HP > NOR. Although the various herbal formulations exhibited ambivalent antioxidant activities in terms of their radical scavenging capabilities, a broad survey of the results of the present study showed that combinatorial herbal formulations (DHfs, THfs, and QHf) appeared to exhibit lower radical scavenging capacities than those of the SHfs in vitro.

Herbal Medicine: Yesterday, Today and Tomorrow

Herbal medicines involve the integration of several therapeutic experiences and practices of indigenous systems of medicine that may span many previous generations, which often provides valuable guidelines to the selection, preparation and application of herbal formulation for the treatment, control and management of variety of ailments. According to World Health Organization, 60% of the world’s population depends on traditional medicine and 80% of the population in developing countries depends almost entirely on traditional medicine practices and herbal medicines for their primary health care needs. As a result of increasing demand for herbal medicines, there are increasing concerns about the safety, standardization, efficacy, quality, availability and preservation of herbal products by policy-makers, health professionals as well as the general public. Improvement in the quality of herbal medicines could be achieved by deliberate implementation of good agricultural practices (GAPs) at the point of cultivation of medicinal plants and good manufacturing practices (GMPs) during the process of manufacture and packaging of finished herbal products, as well as post-marketing quality assurance surveillance. Additionally, following the current sustained improvements in quality control and regulatory measures in many countries of the world, it is envisaged that in the near future, herbal medicinal practices will be integrated into the conventional medicines.

Glycemic Indices/Renal and Hepatic Antioxidant Status of Hyperglycemic Rats Treated with Single and Combinatorial Herbal Formulations

The present study ascertained the comparative capacities of single and combinatorial herbal formulations of Acanthus montanus, Emilia coccinea, Hibiscus rosasinensis and Asystasia gangetica to exert glycemic control and ameliorate oxidative stress in renal and hepatic tissues of alloxan-induced hyperglycemic rats (HyGR) following 30 days treatment. Phytochemical composition of the herbal extracts and fasting plasma glucose concentration (FPGC) of the rats were measured by standard methods. The post mitochondrial supernatant fractions (PMSF) of renal and hepatic tissues homogenates were measured for activity levels of glutathione peroxidase (GPOx), superoxide dismutase (SOD) and catalase (CAT) as well as glutathione (GSH) concentration. Comparatively, flavonoids were the most abundant phytochemical present in the four herbal extracts. FPGC of treated HyGR was within the range of 66.30 ± 0.71 - 133.00 ± 0.63 mg/dL as against the untreated hyperglycemic rat group=368.20 ± 0.72 mg/dL (p<0.05). At the end of the experimental time, treated HyGR liver SOD activities were lower than that of normal group (p<0.05). Liver and kidney GPOx activities of HyGR were 2.36 folds and 3.93 folds lower than the normal rats. Furthermore, liver and kidney CAT activities of the treated HyGR were significantly (p<0.05) lower than the normal rats, whereas liver and kidney GSH/GSSG ratios were significantly (p<0.05) increased when compared with treated HyGR. Combinatorial herbal formulations exerted greater glycemic control than the single herbal formulations and caused a sparing effect on renal and hepatic antioxidants against reactive oxygen species.

GC-MS Analysis, Hypoglycemic Activity of Aqueous Root Extract of Carica papaya and Its Effects on Blood Lipid Profile and Hepatorenal Tissues Biomarkers of Diabetic Rats

The likely phytocomponents, present in aqueous root extract (AqRE) of Carica papaya, responsible for hypoglycemic activity and their capacity to reverse altered blood lipid profile and compromised hepatorenal functions in alloxan-induced diabetic rats were investigated. The identification of main phytocomponents of AqRE of C. papaya was carried out using GC-MS system. The capacity of AqRE of C. papaya to reverse altered blood lipid profile and compromised hepatorenal functions were investigated using standard diagnostic techniques. The relative abundance of the 7 major phytocomponents present in AqRE of C. papaya was within the range of 3.49-35.63%. AqRE of C. papaya lowered elevated fasting blood glucose concentration of the diabetic rat group by 30.95%. The diabetic rat group treated with AqRE of C. papaya gave absolute values of TC-(HDL-C)]/(HDL-C=1.15 units, TC/ HDL-C=2.15 units and LDL-C/HDL-C=1.56 units. Additionally, the ratio of serum ALT to AST activities of the diabetic rat group treated with AqRE of C. papaya gave absolute value of 2.27 units. Serum total bilirubin, creatinine and urea concentrations of the diabetic rat group treated with AqRE of C. papaya were significantly lower (p<0.05) than that of diabetic rat group. GC-MS chromatogram of AqRE of C. papaya revealed the presence of phytochemicals of therapeutic potentials. AqRE of C. papaya ameliorated hyperglycemia and dyslipidemia in the diabetic rats. Finally, AqRE of C. papaya exhibited greater capacity to ameliorate obstructive liver dysfunction than hepatic tissue injuries in the diabetic rats.

GCâÂÂMS Analysis of Aqueous Extract of Unripe Fruit of Carica papaya

The present study was aimed to identify the likely phytocomponents present in Aqueous Extract of Unripe Fruit (AqEUF) of Carica papaya. The phytocomponents present in AqEUF of C. papaya was identified using GC–MS detection system. The results showed the presence of fifteen phytocomponents in AqEUF of C. papaya. The major phytocomponents present in AqEUF of C. papaya in terms of their relative abundance were octadecanoic acid, hexadecenoic acid, Z-11 and hexadecanoic acid, methyl ester, which corresponded to 23.84%, 19.17% and 18.25% respectively. The relative abundance of minor phytocomponents present in AqEUF of C. papaya was within a narrow range of 0.78-5.38%. The present investigation revealed that AqEUF of C. papaya was composed of variety of metabolites and therapeutic active substances as well as novel substances. These substances could be isolated and further empirically evaluated to confirm their biologic and medicinal activities as well as investigate their mechanism of action.