Glory Kah - Academia.edu (original) (raw)
Papers by Glory Kah
Research Square (Research Square), Mar 8, 2022
In this study, a quick, simple, cost-e cient, and green procedure for silver nanoparticles (AgNPs... more In this study, a quick, simple, cost-e cient, and green procedure for silver nanoparticles (AgNPs) biosynthesis was executed at 25°C using 5 easily accessible plants from Cameroon including Carica papaya, Achillea millefolium, Perilla frutescens, Ocimum gratissimum, and Garcinia kola. These plants served as capping and reducing agents, while the AgNO 3 salt was the precursor. Initially, bioreduction of metallic Ag + to Ag 0 nanoparticles was established via a reduction in pH. Biosynthesis of AgNPs was primarily a rmed visually via a color change of the reaction mixtures with the ultraviolet-visible (UV-Vis) spectroscopy absorption peaks demonstrating that the synthesized particles were indeed AgNPs. X-ray diffractometry (XRD) showed the nanoparticles were crystalline in nature and had negative zeta potential (ζ-potential) values, which indicate they could be naturally stable. The phytochemical and Fourier transform infrared (FTIR) spectroscopic analyses revealed the possible phytochemicals in each aqueous plant extract responsible for reducing the Ag + metallic ions to nanoparticles followed by capping and stabilization of the nanoparticles. The high-resolution transmission electrons microscopy (HRTEM) micrographs revealed nanoparticles of varying shapes and sizes. Also, micrographs from the scanning electron microscopy (SEM) showed clouds of polydispersed nanoparticles, which were con rmed by energy dispersive X-ray (EDX) spectroscopy to be highly composed of Ag, with strong optical peaks around 3 kV. The results thus validate that these AgNPs can be e ciently formulated using easily available tropical plants for safe applications in various sectors such as medicine and agriculture.
Cells
Different conventional therapeutic procedures are utilized globally to manage cancer cases, yet t... more Different conventional therapeutic procedures are utilized globally to manage cancer cases, yet the mortality rate in patients with cancer remains considerably high. Developments in the field of nanotechnology have included novel therapeutic strategies to deal with cancer. Biogenic (green) metallic silver nanoparticles (AgNPs) obtained using plant-mediated protocols are attractive to researchers exploring cancer treatment. Biogenic AgNPs present advantages, since they are cost-effective, easy to obtain, energy efficient, and less toxic compared to chemically and physically obtained AgNPs. Also, they present excellent anticancer abilities thanks to their unique sizes, shapes, and optical properties. This review provides recent advancements in exploring biogenic AgNPs as a drug or agent for cancer treatment. Thus, great attention was paid to the anticancer efficacy of biogenic AgNPs, their anticancer mechanisms, their efficacy in cancer photodynamic therapy (PDT), their efficacy in ta...
Toxins
This study evaluated the impact of seasonal and geographical variations on the toxigenicity of As... more This study evaluated the impact of seasonal and geographical variations on the toxigenicity of Aspergillus and Fusarium strains previously isolated from smallholder dairy cattle feeds and feedstuffs sampled during summer and winter in the Free State and Limpopo provinces of South Africa (SA). In total, 112 potential toxigenic fungal species were obtained and determined for their capability to produce mycotoxins on solid Czapek Yeast Extract Agar (CYA); followed by liquid chromatography-mass spectrometry (LC-MS/MS) analysis. Our result revealed that 41.96% of the fungal species produced their respective mycotoxins, including aflatoxin B1 (AFB1), aflatoxin B2 (AFB2), and zearalenone (ZEN), with higher levels of AFB1 (0.22 to 1045.80 µg/kg) and AFB2 (0.11 to 3.44 µg/kg) produced by fungal species isolated from summer samples than those in winter [(0.69 to 14.44 µg/kg) and (0.21 to 2.26 µg/kg), respectively]. The same pattern was also observed for AFB1 and AFB2 in Limpopo (0.43 to 1045....
Fungal Biology and Biotechnology
Background Several metabolites released by fungal species are an essential source of biologically... more Background Several metabolites released by fungal species are an essential source of biologically active natural substances. Gas chromatography high resolution time-of-flight mass spectrometry (GC-HRTOF-MS) is one of the techniques used in profiling the metabolites produced by microorganisms, including Talaromyces pinophilus. However, there is limited information regarding differential substrates’ impacts on this fungal strain’s metabolite profiling. This study examined the metabolite profile of T. pinophilus strain SPJ22 cultured on three different media, including solid czapek yeast extract agar (CYA), malt extract agar (MEA) and potato dextrose agar (PDA) using GC-HRTOF-MS. The mycelia including the media were plugged and dissolved in 5 different organic solvents with varying polarities viz.: acetonitrile, dichloromethane, hexane, 80% methanol and water, and extracts analysed on GC-HRTOF-MS. Results The study revealed the presence of different classes of metabolites, such as fatt...
Pharmaceutics
Cancer continues to cause an alarming number of deaths globally, and its burden on the health sys... more Cancer continues to cause an alarming number of deaths globally, and its burden on the health system is significant. Though different conventional therapeutic procedures are exploited for cancer treatment, the prevalence and death rates remain elevated. These, therefore, insinuate that novel and more efficient treatment procedures are needed for cancer. Curcumin, a bioactive, natural, phenolic compound isolated from the rhizome of the herbaceous plant turmeric, is receiving great interest for its exciting and broad pharmacological properties. Curcumin presents anticancer therapeutic capacities and can be utilized as a photosensitizing drug in cancer photodynamic therapy (PDT). Nonetheless, curcumin′s poor bioavailability and related pharmacokinetics limit its clinical utility in cancer treatment. This review looks at the physical and chemical properties, bioavailability, and safety of curcumin, while focusing on curcumin as an agent in cancer therapy and as a photosensitizer in canc...
Research Square (Research Square), Mar 8, 2022
In this study, a quick, simple, cost-e cient, and green procedure for silver nanoparticles (AgNPs... more In this study, a quick, simple, cost-e cient, and green procedure for silver nanoparticles (AgNPs) biosynthesis was executed at 25°C using 5 easily accessible plants from Cameroon including Carica papaya, Achillea millefolium, Perilla frutescens, Ocimum gratissimum, and Garcinia kola. These plants served as capping and reducing agents, while the AgNO 3 salt was the precursor. Initially, bioreduction of metallic Ag + to Ag 0 nanoparticles was established via a reduction in pH. Biosynthesis of AgNPs was primarily a rmed visually via a color change of the reaction mixtures with the ultraviolet-visible (UV-Vis) spectroscopy absorption peaks demonstrating that the synthesized particles were indeed AgNPs. X-ray diffractometry (XRD) showed the nanoparticles were crystalline in nature and had negative zeta potential (ζ-potential) values, which indicate they could be naturally stable. The phytochemical and Fourier transform infrared (FTIR) spectroscopic analyses revealed the possible phytochemicals in each aqueous plant extract responsible for reducing the Ag + metallic ions to nanoparticles followed by capping and stabilization of the nanoparticles. The high-resolution transmission electrons microscopy (HRTEM) micrographs revealed nanoparticles of varying shapes and sizes. Also, micrographs from the scanning electron microscopy (SEM) showed clouds of polydispersed nanoparticles, which were con rmed by energy dispersive X-ray (EDX) spectroscopy to be highly composed of Ag, with strong optical peaks around 3 kV. The results thus validate that these AgNPs can be e ciently formulated using easily available tropical plants for safe applications in various sectors such as medicine and agriculture.
Cells
Different conventional therapeutic procedures are utilized globally to manage cancer cases, yet t... more Different conventional therapeutic procedures are utilized globally to manage cancer cases, yet the mortality rate in patients with cancer remains considerably high. Developments in the field of nanotechnology have included novel therapeutic strategies to deal with cancer. Biogenic (green) metallic silver nanoparticles (AgNPs) obtained using plant-mediated protocols are attractive to researchers exploring cancer treatment. Biogenic AgNPs present advantages, since they are cost-effective, easy to obtain, energy efficient, and less toxic compared to chemically and physically obtained AgNPs. Also, they present excellent anticancer abilities thanks to their unique sizes, shapes, and optical properties. This review provides recent advancements in exploring biogenic AgNPs as a drug or agent for cancer treatment. Thus, great attention was paid to the anticancer efficacy of biogenic AgNPs, their anticancer mechanisms, their efficacy in cancer photodynamic therapy (PDT), their efficacy in ta...
Toxins
This study evaluated the impact of seasonal and geographical variations on the toxigenicity of As... more This study evaluated the impact of seasonal and geographical variations on the toxigenicity of Aspergillus and Fusarium strains previously isolated from smallholder dairy cattle feeds and feedstuffs sampled during summer and winter in the Free State and Limpopo provinces of South Africa (SA). In total, 112 potential toxigenic fungal species were obtained and determined for their capability to produce mycotoxins on solid Czapek Yeast Extract Agar (CYA); followed by liquid chromatography-mass spectrometry (LC-MS/MS) analysis. Our result revealed that 41.96% of the fungal species produced their respective mycotoxins, including aflatoxin B1 (AFB1), aflatoxin B2 (AFB2), and zearalenone (ZEN), with higher levels of AFB1 (0.22 to 1045.80 µg/kg) and AFB2 (0.11 to 3.44 µg/kg) produced by fungal species isolated from summer samples than those in winter [(0.69 to 14.44 µg/kg) and (0.21 to 2.26 µg/kg), respectively]. The same pattern was also observed for AFB1 and AFB2 in Limpopo (0.43 to 1045....
Fungal Biology and Biotechnology
Background Several metabolites released by fungal species are an essential source of biologically... more Background Several metabolites released by fungal species are an essential source of biologically active natural substances. Gas chromatography high resolution time-of-flight mass spectrometry (GC-HRTOF-MS) is one of the techniques used in profiling the metabolites produced by microorganisms, including Talaromyces pinophilus. However, there is limited information regarding differential substrates’ impacts on this fungal strain’s metabolite profiling. This study examined the metabolite profile of T. pinophilus strain SPJ22 cultured on three different media, including solid czapek yeast extract agar (CYA), malt extract agar (MEA) and potato dextrose agar (PDA) using GC-HRTOF-MS. The mycelia including the media were plugged and dissolved in 5 different organic solvents with varying polarities viz.: acetonitrile, dichloromethane, hexane, 80% methanol and water, and extracts analysed on GC-HRTOF-MS. Results The study revealed the presence of different classes of metabolites, such as fatt...
Pharmaceutics
Cancer continues to cause an alarming number of deaths globally, and its burden on the health sys... more Cancer continues to cause an alarming number of deaths globally, and its burden on the health system is significant. Though different conventional therapeutic procedures are exploited for cancer treatment, the prevalence and death rates remain elevated. These, therefore, insinuate that novel and more efficient treatment procedures are needed for cancer. Curcumin, a bioactive, natural, phenolic compound isolated from the rhizome of the herbaceous plant turmeric, is receiving great interest for its exciting and broad pharmacological properties. Curcumin presents anticancer therapeutic capacities and can be utilized as a photosensitizing drug in cancer photodynamic therapy (PDT). Nonetheless, curcumin′s poor bioavailability and related pharmacokinetics limit its clinical utility in cancer treatment. This review looks at the physical and chemical properties, bioavailability, and safety of curcumin, while focusing on curcumin as an agent in cancer therapy and as a photosensitizer in canc...