Semakaleng Mpai

Dr. Semakaleng Mpai

Tshwane University of Technology
orcid

Research Focus & Metrics

Academic Career Length

3Years (2024-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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29 August 2025 in Foods
Verified
Journal Article
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SGSbahle Gumede
Sbahle Gumede
Semakaleng MpaiSemakaleng Mpai
Semakaleng Mpai
SPSreejarani Kesavan Pillai
Sreejarani Kesavan Pillai
Dharini SivakumarDharini Sivakumar
Dharini Sivakumar
Tomato fruit is susceptible to decay caused by Colletotrichum gloeosporioides. An edible coating derived from essential oils loaded into a chitosan polysaccharide polymer is a sustainable delivery approach to improve coating versatility and stability for reduced reliance on synthetic fungicides to combat anthracnose incidence in tomatoes. The objective of this study was to evaluate the antifungal efficacy of nanostructured thyme essential oil incorporated into chitosan coatings [Nano-(T)-EO-CS] against Colletotrichum gloeosporioides in tomato fruits, and to investigate the underlying mechanisms contributing to its inhibitory effects. Nano-(T)-EO of (1% v/v) showed the greatest antifungal activities while achieving complete inhibition of C. gloeosporioides. At (0.8% w/v) concentration, chitosan inhibited 78% of radial mycelial growth in C. gloeosporioides. Loading Nano-(T)-EO (1% v/v) into chitosan (0.8% w/v) completely inhibited spore germination (100%). The surface electron microscopy revealed that the Nano-(T)-EO-CS coating induced significant deformation and inhibited the growth of C. gloeosporioides. Compared with the control, the Nano-(T)-EO-CS coating reduced disease incidence by 50%, whereas the commercial antifungal agent Sporekill® reduced incidence by 40% in preventively inoculated tomatoes stored at 10 °C and 85% relative humidity (RH) for 14 days after harvest, and at 18 °C for 3 days at the market shelf condition. Despite chitinase activity peaking on day 14 of cold storage, it peaked significantly on day 7 in Nano-(T)-EO-CS and Sporekill®-treated tomatoes. The Nano-(T)-EO-CS coating enhanced ferric-reducing antioxidant power and total phenol content in tomatoes for 7 and 14 d of postharvest storage. The chitosan-based edible coating loaded with thyme essential oil offers a sustainable, eco-friendly alternative to chemical fungicides for improving tomato shelf life and reducing decay.

12 June 2025 in South African Journal of Botany
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Journal Article
Open access
TCThabiso Anasthasia Chokoe
Thabiso Anasthasia Chokoe
MSMawande Hugh Shinga
Mawande Hugh Shinga
YSYardjouma Silue
Yardjouma Silue
Semakaleng MpaiSemakaleng Mpai
Semakaleng Mpai
Olaniyi FawoleOlaniyi Fawole
Olaniyi Fawole
ANAshwell Rungano Ndhlala
Ashwell Rungano Ndhlala

1 February 2024 in Nitrogen
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Journal Article
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AGAuges Gatabazi
Auges Gatabazi
ANAshwell Ndhlala
Ashwell Ndhlala
MMMireille Asanzi Mvondo-She
Mireille Asanzi Mvondo-She
Semakaleng MpaiSemakaleng Mpai
Semakaleng Mpai
Common bean (Phaseolus vulgaris L.) ranks among the most produced and consumed legume crops and contains essential macro- and micronutrients. Grain yield of the food crop is markedly decreased by poor management, especially a lack of additional essential nutrient elements through the application of fertilizers. In addition to the application of fertilizers, scholarly research and crop farmers have shown that the use of biofertilizer inoculants improves the yield of legume crops. The objective of this research study was to assess the effectiveness of peat-based Rhizobium tropici sp. UD5 on the growth, yield, and nitrogen concentration of common bean. The peat inoculant contained 6.5 × 109 viable cells/g. The experiment was conducted in two climatic zones, as described by the Koppen–Gieger climatic classification system. Treatments involved the peat-based inoculant Rhizobium tropici (T0 = 0 g without inoculation, T1 = 250 g of peat inoculant of strain UD5 for 50 kg seeds, T2 = 500 g of inoculant of strain UD5, and T3 = 200 g of comparative peat inoculant). The results indicated that common-bean-inoculated formulation of R. tropici sp. strain UD5 increased the following parameters compared to the controls: plant height (T1 = 18.22%, T2 = 20.41%, and T3 = 19.93% for bioclimatic zone 1; T1 = 16.78%, T2 = 20.71%, and T3 = 19.93% for bioclimatic zone 2), root length (T1 = 13.26%, T2 = 21.28%, and T3 = 19.38% for zone 1; T1 = 15.06%, T2 = 23.70%, and T3 = 19.20% for zone 2), number of nodules (T1 = 1162.57%, T2 = 1166.36%, and T3 = 1180.30% for zone 1; T1 = 1575%, T2 = 1616.5%, and T3 = 1608.25% for zone 2), size of nodules (T1 = 224.07%, T2 = 224.07%, and T3 = 208.33% for zone 1; T1 = 166.4%, T2 = 180%, and T3 = 140% for zone 2), and yield (T1 = 40.49%, T2 = 47.10%, and T3 = 45.45% for zone 1; T1 = 62.16%, T2 = 54.05%, and T3 = 58.55% for zone 2). R. tropici sp. UD5 peat inoculant formulation also increased the nitrogen concentration in leaves compared to the control (T1 = 3.75%, T2 = 1.12%, and T3 = 8.72%) in both bioclimatic zones. The findings of this study provide significant information on the positive effect of R. tropic UD5 strain peat inoculant application in the improvement of plant growth, development, and yield through the formation of nodules.

12 February 2026 in Metabolism Open
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Journal Article
Open access
KMKabelo Mokgalaboni
Kabelo Mokgalaboni
SASyeda R. Ahmed
Syeda R. Ahmed
WPWENDY PHOSWA
WENDY PHOSWA
RMReneilwe Given Reneilwe Mashaba
Reneilwe Given Reneilwe Mashaba
TMTyson Tebogo Mokgalabone
Tyson Tebogo Mokgalabone
SLSogolo Lucky Lebelo
Sogolo Lucky Lebelo
Moringa oleifera (M. oleifera) has shown potential efficacy in animal models of metabolic disorders treatment; however, clinical evidence has been obtained from small sample sizes, and the findings remain contradictory. This study aims to evaluate the effects of M. oleifera on hypertension and hyperglycemia in individuals with metabolic disorders. This was a registered meta-analysis (CRD420251184037) that employed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. A literature search was conducted on PubMed, Scopus, Web of Science, Cochrane Library, ScienceDirect, and ResearchGate. The umbrella terms moringa oleifera Lam, moringa oleifera, and metabolic diseases were used, along with Boolean operators (OR, AND), and each database was adjusted accordingly. A meta-analysis web tool and JAMOVI version 2.6.44.0 were used to analyze the data, with results reported as mean differences (MD) or standardized mean differences (SMDs) and 95% confidence intervals (CI). Twenty clinical studies, conducted in patients with metabolic diseases, were analyzed. The pooled estimates suggest a modest association between M. oleifera and fasting blood glucose, SMD = −0.70, 95% CI (−1.06, −0.34), p = 0.0002, and glycated hemoglobin, MD = −0.62%, 95% CI (−0.99, −0.25), p = 0.0009. Furthermore, M. oleifera was associated with reduced diastolic blood pressure, MD = −6.82 mmHg, 95% CI (−7.84, −5.80), p < 0.0001, and systolic blood pressure, MD = −7.50 mmHg, 95% CI (−10.96, −4.03), p < 0.0001. Meta-regression showed that patients' conditions and the continent where the study was conducted were significant moderators of the effect sizes, especially for FBG and SBP. The evidence gathered in this study suggests that M. oleifera may have potential in patients with metabolic disorders. However, due to heterogeneity and limitations in the study quality, these findings must be considered preliminary and hypothesis-generating and thus highlight the need for future powered condition-specific trials.

11 September 2025 in South African Journal of Botany
Verified
Journal Article
Open access
Semakaleng MpaiSemakaleng Mpai
Semakaleng Mpai
ANAshwell Ndhlala
Ashwell Ndhlala
MMMulanga L. Mulaudzi
Mulanga L. Mulaudzi
PMPeter Masoko
Peter Masoko

13 November 2025 in Molecules
Verified
Journal Article
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MMMaeleletse Glas Mopai
Maeleletse Glas Mopai
Semakaleng MpaiSemakaleng Mpai
Semakaleng Mpai
JSJohannes Van Staden
Johannes Van Staden
ANAshwell Ndhlala
Ashwell Ndhlala
Mistletoe species grow hemiparasitically on a wide spectrum of trees occurring in the tropical, subtropical and temperate zones. Mistletoe has been associated with fertility, vitality and fatality in humans. In the present review, we examine articles published in English and/or with the option to translate them into English on the distribution mechanism, ecological impact and value. This study aimed to interrogate and outline the phytonutrient profiling, ethnomedicinal and ethnopharmacological applications, toxicology and quality control of mistletoes, particularly the Loranthaceae and Viscaceae families. There are at least 1400 species of mistletoe belonging to these two families across the world. Humans have used mistletoe for years, and it has a rich history, mainly in traditional medicine. Recent research interests accompanied by investigations on mistletoe have made a major contribution to our understanding of the survival behavior and mechanisms of the species. This has prompted researchers to intensively investigate and justify its potential and applications in traditional medicine systems to further incorporate it into conventional scientific medicine processes. This study thoroughly outlines the nutritional and phytochemical constituents of various mistletoe species, as well as the factors that play a role in the process. The sections in this study dedicated to elaborating on the nutritional and phytochemical composition of mistletoe show that it is a plant species rich in nutrients and bioactive compounds, especially compared to its host. Its survival mechanism makes it possible for this plant species to contain significant quantities of both nutrients (proximate components and mineral elements) and bioactive compounds (viscin, alkaloids, phenolics and polyphenolics, tannins, flavonoids, terpenoids, glycosides, and saponins). Overall, mistletoe species have potential as medicinal plants, offering a range of health benefits and the ability to treat ailments (both communicable and non-communicable diseases). However, there are insufficient investigations and records of mistletoe’s toxicity, safety and quality control. Therefore, it is important to further investigate the potential applications, mechanisms of action, and optimal uses of mistletoe preparations and/or extracts.