Publications by authors named "John Ogbonna"

Mosquitoes are the most medically important arthropod vectors of several human diseases. These diseases are known to severely incapacitate and debilitate millions of people, resulting in countless loss of lives. Over the years, several measures have been put in place to control the transmission of mosquito-borne diseases, one of which is using repellents.

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  • Retinoblastoma is the most common eye cancer in children and poses treatment challenges, especially in developing countries due to late diagnoses.
  • Current treatments include surgery, radiotherapy, and chemotherapy, but their side effects can lead to high mortality rates and reduced quality of life.
  • Nanoparticle delivery systems show promise in improving cancer treatment by targeting therapy more effectively, yet their application in clinical settings for retinoblastoma remains underexplored.
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Designing oral formulations for children is very challenging, especially considering their peculiarities and preferences. The choice of excipients, dosing volume and palatability are key issues of pediatric oral liquid medicines. The purpose of the present study is to develop an oral pediatric solution of a model bitter drug (ranitidine) following a patient centric design process which includes the definition of a target product profile (TPP).

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  • * Preventive measures, such as social distancing and mask-wearing, have helped slow the virus's spread; however, the persistent nature of the virus and its variants makes complete eradication difficult.
  • * The development of effective vaccines relies heavily on nanotechnology, which enhances vaccine delivery and efficacy; currently, four vaccines are approved for use, with more in progress.
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Context: Poor aqueous solubility of artemether and lumefantrine makes it important to seek better ways of enhancing their oral delivery and bioavailability.

Objective: To formulate and carry out in vitro and anti-malarial pharmacodynamic evaluations of solidified reverse micellar solutions (SRMS)-based solid lipid microparticles (SLMs) of artemether and lumefantrine for oral delivery and improved bioavailability.

Materials And Methods: Rational blends of Softisan(®)154 and Phospholipon(®)90H lipid matrices, and different concentrations of artemether and lumefantrine were used to formulate several batches of SLMs.

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Context: Formulation, characterization, in vitro and in vivo evaluation of halofantrine-loaded solid lipid microparticles (SLMs).

Objective: The objective of the study was to formulate and evaluate halofantrine-loaded SLMs.

Materials And Methods: Formulations of halofantrine-loaded SLMs were prepared by hot homogenization and thereafter lyophilized and characterized using particle size, pH stability, loading capacity (LC) and encapsulation efficiency (EE).

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Objectives: To formulate and evaluate artesunate-loaded lipospheres and study the in vitro-in vivo correlations (IV-IVC).

Materials And Methods: Lipospheres were formulated by melt homogenisation using structured lipid matrices consisting of (1:3 and 1:6) soybean oil and dika wax and were characterised in vitro and in vivo.

Results: The small angle X-ray diffraction (SAXD) results of the lipid matrices showed prominent reflection at 2θ = 2.

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To develop a novel PEGylated ibuprofen tablet formulations and evaluate its anti-inflammatory activity and pharmacokinetics profile in an animal model. Six batches of PEGylated ibuprofen tablets were prepared by direct compression using Avicel® and lactose as the binder diluents. In vivo anti-inflammatory activity of the tablets was carried out as well as the pharmacokinetics profiles.

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Objective: To formulate and evaluate solid-reversed-micellar-solution (SRMS)-based solid lipid microparticles (SLMs) for intramuscular administration of gentamicin.

Methods: SRMS formulated with Phospholipon® 90G and Softisan® 154 were used to prepare gentamicin-loaded SLMs. Characterizations based on size and morphology, stability and encapsulation efficiency (EE%) were carried out on the SLMs.

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