Evaluation of the wound healing activity of formulated ointments and water preparation from Sida rhombifolia leaf extract

Background: Several plants including Sida rhombifolia Linn. (Malvaceae) which are said to be used by traditional health practitioners in Tanzania for wound treatment have not yet been evaluated. The objective of this study was to investigate the ointment formulation of S. rhombifolia leaves for its potential wound healing activities.Methods: Wound healing activity of S. rhombifolia leaves was investigated in mice using 50%, 33% and 25% formulated 80% ethanolic leaves extract ointment and water preparations. Excisional and incisional wound-induction models were used with 6 albino mice in each group. The wound diameter (for contraction assessment), duration of re-epithelisation in days, percentage tensile strength as well as the degree of collagenisation and fibrosis were investigated.Results: S. rhombifolia leaves extract had significant mean percentage wound closure for all ointment formulations used and for the water preparation from day 7. A significant percentage tensile strength on day 10 for all formulations used was observed. The 50% ointment had a mean of 64.1±1.7 (p=1.2-09), 33% ointment had a mean of 64.0±3.2 (p=2.4-08) and the 25% ointment had a mean of 53.1±4.0 (p=1.3-06). A remarkable fibrosis and collagenisation for the 50% ointment and the water preparation was observed.Conclusion: The formulated ointments and the water preparations of S. rhombifolia leaves have a potential benefit in enhancing wound healing. A bioassay guided fractionation is recommended to allow identification of its active compound(s) with wound healing activity for drug development

Antimalarial activity, Plasmodium berghei, traditional medicines

Aqueous ethanol (80%) extracts of six plants used traditionally for treatment of malaria, Vepris glomerata (F.Hoffm.) Engl (Rutaceae), Maranthus floribunda (Bak.) F.White (Chrysobalanaceae), Strophanthus eminii Asch. & Pax ex Pax (Apocynaceae), Cassia abbreviata Oliv. (Leguminosae) and Caesalpinia bonducella L. Fleming (Fabaceae) were screened for antimalarial activity to establish validity of their claims. The extracts exhibited antimalarial activity in the 4-day Peter’s suppressive antimalarial assay in mice inoculated with red blood cells parasitized with Plasmodium berghei. The extracts gave ID50 values of 42.8, 111.0, 639.3 and 1560 mg/kg body wt for C. bonducella, C. abbreviata, T. furialis and S. eminii, respectively. The ID50 values for V. glomerata and M. floribunda were above 2400 mg/kg body wt, above which point solubility was a problem. All the tested extracts were innocuous to the mice, up to 2400 mg/kg body wt, suggesting they may be safe for short-term use

Development and characterization of Na2CO3-activated Mozambican bentonite : prediction of optimal activation conditions using statistical design modeling

DATA AVAILABILITY : The data presented in this work are available on request from the corresponding author.A calcium bentonite clay from Boane region (Mozambique) was subjected to an Na2CO3 activation process. The methylene blue test together with energy-dispersive X-ray spectroscopy (EDX) analysis indicated the successful ion exchange of Ca2+ by Na+ ions since the cation exchange capacity (CEC) increased from 67.5 to 74 meq/100 g and the Na/Ca ratio from 2.91 up to 15.8, as the concentration of Na2CO3, activation temperature, and activation time were varied from 2 to 6 wt.%, from 25 to 65 C, and from 2 to 4 h, respectively. However, the increase in the CEC did not follow the same trend as the increase in the Na/Ca ratio, and for the case of Na2CO3 concentration, the increase in the CEC was limited. The X-ray diffraction (XRD) patterns also confirmed that Ca-rich bentonite was effectively modified into Na-bentonite since after the activation, the d(001) decreased from 1.52 nm to 1.30 nm. The statistical design of the experiments showed that as well as the time and the temperature time linear interactive effect, all the other independent factors and their interactive effects had a significant influence on the CEC. The response surface methodology (RSM) indicated that higher values of the CEC can be obtained under the optimal activation conditions of 4 wt.% Na2CO3, at a temperature of 45 C, and with an activation time of 3 h. A statistical model was used to predict the CEC, and the R2 value was 0.99529, which denotes a satisfactory result in predicting the CEC.The World Bank Group, through the Eastern and Southern Africa Higher Education Centres of Excellence Project Initiative (ACE II), and the National Research Foundation (NRF) of South Africa.https://www.mdpi.com/journal/mineralsam2023Chemical Engineerin

Antimicrobial activity and brine shrimp toxicity of extracts of Terminalia brownii roots and stem

BACKGROUND: Ternimalia brownii Fresen (Combretaceae) is widely used in traditional medicine to treat bacterial, fungal and viral infections. There is a need to evaluate extracts of this plant in order to provide scientific proof for it's wide application in traditional medicine system. METHODS: Extraction of stem bark, wood and whole roots of T. brownii using solvents of increasing polarity, namely, Pet ether, dichloromethane, dichloromethane: methanol (1:1), methanol and aqua, respectively, afforded dry extracts. The extracts were tested for antifungal and antibacterial activity and for brine shrimp toxicity test. RESULTS: Extracts of the stem bark, wood and whole roots of T. brownii exhibited antibacterial activity against standard strains of Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae, Salmonella typhi, and Bacillus anthracis and the fungi, Candida albicans and Cryptococcus neoformans. Aqueous extracts exhibited the strongest activity against both bacteria and fungi. Extracts of the roots and stem bark exhibited relatively mild cytotoxic activity against brine shrimp larvae with LC(50 )values ranging from 113.75–4356.76 and 36.12–1458.81 μg/ml, respectively. The stem wood extracts exhibited the highest toxicity against the shrimps (LC(50 )values 2.58–14.88 μg/ml), while that of cyclophosphamide, a standard anticancer drug, was 16.33 (10.60–25.15) μg/ml. CONCLUSION: These test results support traditional medicinal use of, especially, aqueous extracts for the treatment of conditions such as diarrhea, and gonorrhea. The brine shrimp results depict the general trend among plants of the genus Terminalia, which are known to contain cytotoxic compounds such as hydrolysable tannins. These results warrant follow-up through bioassay-directed isolation of the active principles

Health Outcomes, Pathogenesis and Epidemiology of Severe Acute Malnutrition (HOPE-SAM): rationale and methods of a longitudinal observational study

INTRODUCTION: Mortality among children hospitalised for complicated severe acute malnutrition (SAM) remains high despite the implementation of WHO guidelines, particularly in settings of high HIV prevalence. Children continue to be at high risk of morbidity, mortality and relapse after discharge from hospital although long-term outcomes are not well documented. Better understanding the pathogenesis of SAM and the factors associated with poor outcomes may inform new therapeutic interventions. METHODS AND ANALYSIS: The Health Outcomes, Pathogenesis and Epidemiology of Severe Acute Malnutrition (HOPE-SAM) study is a longitudinal observational cohort that aims to evaluate the short- and long-term clinical outcomes of HIV-positive and HIV-negative children with complicated SAM, and to identify the risk factors at admission and discharge from hospital that independently predict poor outcomes. Children aged 0-59mo hospitalised for SAM are being enrolled at three tertiary hospitals in Harare, Zimbabwe, and Lusaka, Zambia. Longitudinal mortality, morbidity and nutritional data are being collected at admission, discharge and for 48 weeks post-discharge. Nested laboratory substudies are exploring the role of enteropathy, gut microbiota, metabolomics and cellular immune function in the pathogenesis of SAM using stool, urine and blood collected from participants and from well-nourished controls

Health outcomes, pathogenesis and epidemiology of severe acute malnutrition (HOPE-SAM): rationale and methods of a longitudinal observational study

Introduction: Mortality among children hospitalised for complicated severe acute malnutrition (SAM) remains high despite the implementation of WHO guidelines, particularly in settings of high HIV prevalence. Children continue to be at high risk of morbidity, mortality and relapse after discharge from hospital although long-term outcomes are not well documented. Better understanding the pathogenesis of SAM and the factors associated with poor outcomes may inform new therapeutic interventions. Methods and analysis: The Health Outcomes, Pathogenesis and Epidemiology of Severe Acute Malnutrition (HOPE-SAM) study is a longitudinal observational cohort that aims to evaluate the short-term and long-term clinical outcomes of HIV-positive and HIV-negative children with complicated SAM, and to identify the risk factors at admission and discharge from hospital that independently predict poor outcomes. Children aged 0–59 months hospitalised for SAM are being enrolled at three tertiary hospitals in Harare, Zimbabwe and Lusaka, Zambia. Longitudinal mortality, morbidity and nutritional data are being collected at admission, discharge and for 48 weeks post discharge. Nested laboratory substudies are exploring the role of enteropathy, gut microbiota, metabolomics and cellular immune function in the pathogenesis of SAM using stool, urine and blood collected from participants and from well-nourished controls

Knowledge matters : the potential contribution of the co-production of research to urban transformation

The purpose of this paper is to share our experiences – as academics and professionals – in co-producing knowledge to improve urban development outcomes in the Global South. The focus of the paper – urban research and practice – is a context in which academic work influences policy and programming, and professional knowledge – validated and certified by academic institutions – forms the basis for urban planning and management. Collaborative research – co-produced with social movement activities – suggests that four issues need to be addressed to establish more equitable relations. First, alternative theories of change about how research leads to social transformation must be recognised, even if they cannot be reconciled. Second, the contribution of social movement leaders to university teaching needs to be institutionalised. Third, the relative status of academics vis-à-vis non-academics must be interrogated, and better understood. Fourth, researchers’ accountability to the marginalised needs to be established. We argue that academics are insufficiently self-critical about the power dynamics involved in knowledge production with social movements, and that long-term relations enable understandings to be built and some of these tensions to be alleviated. Our conclusion highlights the unequal power relations that lie behind these challenges, and summarises key measures to address inequalities and their negative consequences

Knowledge matters: the potential contribution of the co-production of research to urban transformation

The purpose of this paper is to share our experiences – as academics and professionals – in co-producing knowledge to improve urban development outcomes in the Global South. The focus of the paper – urban research and practice – is a context in which academic work influences policy and programming, and professional knowledge – validated and certified by academic institutions – forms the basis for urban planning and management. Collaborative research – co-produced with social movement activities – suggests that four issues need to be addressed to establish more equitable relations. First, alternative theories of change about how research leads to social transformation must be recognised, even if they cannot be reconciled. Second, the contribution of social movement leaders to university teaching needs to be institutionalised. Third, the relative status of academics vis-à-vis non-academics must be interrogated, and better understood. Fourth, researchers’ accountability to the marginalised needs to be established. We argue that academics are insufficiently selfcritical about the power dynamics involved in knowledge production with social movements, and that long-term relations enable understandings to be built and some of these tensions to be alleviated. Our conclusion highlights the unequal power relations that lie behind these challenges, and summarises key measures to address inequalities and their negative consequences

Screening of Traditionally Used Plants for In Vivo Antimalarial Activity in Mice

Aqueous ethanol (80%) extracts of six plants used traditionally for treatment of malaria, Vepris glomerata (F.Hoffm.) Engl (Rutaceae), Maranthus floribunda (Bak.) F.White (Chrysobalanaceae), Strophanthus eminii Asch. & Pax ex Pax (Apocynaceae), Cassia abbreviata Oliv. (Leguminosae) and Caesalpinia bonducella L. Fleming (Fabaceae) were screened for antimalarial activity to establish validity of their claims. The extracts exhibited antimalarial activity in the 4-day Peter's suppressive antimalarial assay in mice inoculated with red blood cells parasitized with Plasmodium berghei. The extracts gave ID50 values of 42.8, 111.0, 639.3 and 1560 mg/kg body wt for C. bonducella, C. abbreviata, T. furialis and S. eminii, respectively. The ID50 values for V. glomerata and M. floribunda were above 2400 mg/kg body wt, above which point solubility was a problem. All the tested extracts were innocuous to the mice, up to 2400 mg/kg body wt, suggesting they may be safe for short-term use