ORCID Profile
0000-0002-7827-6256
Current Organisation
University of South Australia
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Publisher: Elsevier BV
Date: 07-2019
DOI: 10.1016/J.EJPS.2019.05.001
Abstract: Obesity is a rapidly growing epidemic, with over one-third of the global population classified as overweight or obese. Consequently, an urgent need exists to develop innovative approaches and technologies that regulate energy uptake, to curb the rising trend in obesity statistics. In this study, nanostructured clay (NSC) particles, fabricated by spray drying delaminated dispersions technologies that regulate energy uptake, to curb the rising trend in obesity statistics. In this study, nanostructured clay (NSC) particles, fabricated by spray drying delaminated dispersions of commercial clay platelets (Veegum® HS and LAPONITE® XLG), were delivered as complimentary, bioactive excipients with the potent lipase inhibitor, orlistat, for the inhibition of fat (lipid) hydrolysis. Simulated intestinal lipolysis studies were performed by observing changes in free fatty acid concentration and revealed that a combinatorial effect existed when NSC particles were co-administered with orlistat, as evidenced by a 1.2- to 1.6-fold greater inhibitory response over 60 min, compared to dosing orlistat alone. Subsequently, it was determined that a multifaceted approach to lipolysis inhibition was presented, whereby NSC particles adsorbed high degrees of lipid (up to 80% of all lipid species present in lipolysis media) and thus physically shielded the lipid-in-water interface from lipase access, while orlistat covalently attached and blocked the lipase enzyme active site. Thus, the ability for NSC particles to enhance the biopharmaceutical performance and potency of orlistat is hypothesised to translate into promising in vivo pharmacodynamics, where this novel approach is predicted to lead to considerably greater weight reductions for obese patients, compared to dosing orlistat alone.
Publisher: Elsevier BV
Date: 03-2019
DOI: 10.1016/J.ADDR.2018.11.006
Abstract: Self-emulsifying drug delivery systems (SEDDS) offer potential for overcoming the inherent slow dissolution and poor oral absorption of hydrophobic drugs by retaining them in a solubilised state during gastrointestinal transit. However, the promising biopharmaceutical benefits of liquid lipid formulations has not translated into widespread commercial success, due to their susceptibility to long term storage and in vivo precipitation issues. One strategy that has emerged to overcome such limitations, is to combine the solubilisation and dissolution enhancing properties of lipids with the stabilising effects of solid carrier materials. The development of intelligent hybrid drug formulations has presented new opportunities to harness the potential of emulsified lipids in optimising oral bioavailability for lipophilic therapeutics. Specific emphasis of this review is placed on the impact of solidification approaches and excipients on the biopharmaceutical performance of self-emulsifying lipids, with findings highlighting the key design considerations that should be implemented when developing hybrid lipid-based formulations.
Publisher: Springer Science and Business Media LLC
Date: 21-10-2020
DOI: 10.1007/S00394-019-02118-X
Abstract: Application of intelligent formulation design has the ability to address the poor bioavailability and improve the fasted state bioavailability of fish oils. In this study we assessed the ability of a self-emulsifying drug delivery system (SEDDS), AquaCelle Eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) EE were formulated with AquaCelle The AquaCelle Formulating Omega-3 EE with a SEDSS concentrate (AquaCelle
Publisher: Elsevier BV
Date: 08-2018
DOI: 10.1016/J.EJPB.2018.05.028
Abstract: The synergistic effect of nanosizing and lipid-based drug delivery systems (LBDDS) was explored to enhance formulation drug loading levels and improve drug solubilisation in the gastrointestinal environment. A novel formulation combining drug nanocrystals and silica-lipid hybrid (SLH) microparticles as a solid-state LBDDS was developed for the challenging poorly water-soluble drug, ziprasidone. A ziprasidone nanosuspension was fabricated via high-pressure homogenisation, achieving a mean particle size of 280 nm. In vitro dissolution studies revealed the nanosuspension to exhibit a significant 2.4-fold increase in the extent of drug dissolution, relative to pure drug. Novel ziprasidone nanocrystal-loaded SLH microparticles (ncSLH) were formulated by freeze-drying a precursor drug-loaded emulsion with drug nanocrystals and silica nanoparticles. Drug loading levels were increased at least 17-fold relative to conventional SLH microparticles, resulting in an increase in crystalline drug content and a change in surface atomic composition. The in vitro performance was evaluated by quantifying solubilisation levels during simulated intestinal lipolysis studies. Novel ncSLH significantly improved the in vitro fasted state solubilisation of ziprasidone (up to 4.7-fold), thus indicating the potential for such a formulation to overcome some of the various challenges faced by poorly water-soluble, brick-dust drug molecules.
Publisher: Springer Science and Business Media LLC
Date: 11-09-2021
DOI: 10.1007/S13346-020-00853-X
Abstract: Simvastatin (SIM) is a commonly used cholesterol-lowering drug that can reduce the risk of major cardiovascular events. However, due to its poor intrinsic water solubility, the drug is poorly absorbed from the gastrointestinal tract and exhibits a low oral bioavailability of approximately 5%. The aim of this study was to fabricate and optimize SIM encapsulated silica-lipid hybrids (SLH) as a solid-state lipid-based formulation to enhance absorption and bioavailability during a human in vivo pharmacokinetic study. SLH formulations were formulated by spray drying a submicron emulsion with either Aerosil® 300 fumed silica nanoparticles (SLH-A) or Syloid® 244 amorphous micronized silica (SLH-B). A cross-over, double-blinded study design was implemented to evaluate the performance of SLH formulations compared with a commercially available formulation in 12 healthy male participants after oral administration under fasting conditions. SLH formulations enhanced the bioavailability of SIM up to 1.6-fold and more importantly the active simvastatin acid (SIMA), 3.5-fold when compared with an equivalent dose of commercial formulation. The results demonstrate that the porous nanostructure of SLH impact systemic SIM and SIMA concentrations and may serve as a novel approach to enhance the bioavailability of specifically the parent or metabolite. No significant difference was observed in exposure when SLH formulations were administered at 10 mg in comparison with 20 mg of the commercial formulation, suggesting the potential for dose reduction. The study indicated that SLH formulations were safe and well-tolerated when administered to healthy males, confirming the commercial potential of SLH to enhance the bioavailability of poorly water-soluble drugs. Graphical abstract.
Publisher: Elsevier BV
Date: 03-2020
DOI: 10.1016/J.IJPHARM.2020.119069
Abstract: Abiraterone acetate, marketed as Zytiga®, is an antiandrogen medication used in the treatment of prostate cancer. Abiraterone acetate is a BCS Class IV compound associated with several oral delivery challenges. Its low solubility and high lipophilicity lead to poor oral bioavailability (<10%) and a dramatic positive food effect (5-10-fold). Hence, a large dose of abiraterone acetate (1000 mg per day) is prescribed to patients who must fast for at least 1 h before and 2 h after administration. The recent expiry of Zytiga®s' patent has led to the emergence of publications describing improved oral formulation strategies for abiraterone acetate. This review aims to discuss the characteristics of abiraterone acetate that lead to its unfavorable oral delivery, examine the oral formulation strategies that have been applied, and to describe potential alternative oral formulation strategies that have been used for other BCS Class IV drugs, to determine the most valuable strategies to develop novel and improved alternatives to the current commercial product. Specific emphasis of this review is placed on enabling oral formulation strategies that can improve solubilization and bioavailability, reduce the clinical dose and remove the pharmaceutical food effect to ultimately provide prostate cancer patients with a more efficient formulation with greater patient compliance.
Publisher: Elsevier BV
Date: 06-2020
Publisher: Elsevier BV
Date: 2022
Publisher: American Chemical Society (ACS)
Date: 05-11-2020
Abstract: Porous colloids have been shown to exert unique bioactivities for mediating lipid (fat) metabolism and thereby offer significant potential as anti-obesity therapies. In this study, we compare the capacity for two classes of colloids, that is, smectite clays (Laponite XLG, LAP montmorillonite, MMT) and mesoporous silica (SBA-15 ordered silica MPS), to impede intestinal lipid hydrolysis and provoke lipid and carbohydrate excretion through adsorption within their particle matrices. A two-stage
Publisher: Elsevier BV
Date: 10-2021
Publisher: CRC Press
Date: 11-08-2021
Publisher: Elsevier BV
Date: 05-2022
DOI: 10.1016/J.IJPHARM.2022.121695
Abstract: The concomitant administration of oral drugs with food can result in significant changes in bioavailability, leading to variable pharmacokinetics and considerable clinical implications, such as over- or under-dosing. Consequently, there is increasing demand for bio-enabling formulation strategies to reduce variability in exposure between the fasted and fed state and/or mitigate the pharmaceutical food effect. The current review critically evaluates technologies that have been implemented to overcome the positive food effects of pharmaceutical drugs, including, lipid-based formulations, nanosized drug preparations, cyclodextrins, amorphisation and solid dispersions, prodrugs and salts. Additionally, improved insight into preclinical models for predicting the food effect is provided. Despite the wealth of research, this review demonstrates that application of optimal formulation strategies to mitigate the positive food effects and the evaluation in preclinical models is not a universal approach, and improved standardisation of models to predict the food effects would be desirable. Ultimately, the successful reformulation of specific drugs to eliminate the food effect provides a panoply of advantages for patients with regard to clinical efficacy and compliance.
Publisher: MDPI AG
Date: 14-01-2023
DOI: 10.3390/PHARMACEUTICS15010284
Abstract: Reformulating poorly water-soluble drugs as supersaturated lipid-based formulations achieves higher drug loading and potentially improves solubilisation and bioavailability. However, for the weak base blonanserin, silica solidified supersaturated lipid-based formulations have demonstrated reduced in vitro solubilisation compared to their liquid-state counterparts. Therefore, this study aimed to understand the influence of supersaturated drug load on blonanserin solubilisation from liquid and silica solidified supersaturated self-nanoemulsifying drug delivery systems (super-SNEDDS) during in vitro lipolysis. Stable liquid super-SNEDDS with varying drug loads (90–300% of the equilibrium solubility) were solidified by imbibition into porous silica microparticles (1:1 lipid: silica ratio). In vitro lipolysis revealed greater blonanserin solubilisation from liquid super-SNEDDS compared to solid at equivalent drug saturation levels, owing to strong silica-BLON/lipid interactions, evidenced by a significant decrease in blonanserin solubilisation upon addition of silica to a digesting liquid super-SNEDDS. An increase in solid super-SNEDDS drug loading led to increased solubilisation, owing to the increased drug:silica and drug:lipid ratios. Solidifying SNEDDS with silica enables the fabrication of powdered formulations with higher blonanserin loading and greater stability than liquid super-SNEDDS, however at the expense of drug solubilisation. These competing parameters need careful consideration in designing optimal super-SNEDDS for pre-clinical and clinical application.
Publisher: Elsevier
Date: 2020
Publisher: Elsevier BV
Date: 07-2020
Publisher: Elsevier BV
Date: 02-2021
No related grants have been discovered for Tahlia Meola.