Objective: This work aimed to explore the possibility of using Fourier-transform infrared (FTIR) spectroscopy and chemometrics to develop multivariate models to authenticate the "halal-ity" of pharmaceutical excipients with controversial halal status (e.g., magnesium stearate).
Materials and Methods: The FTIR spectral fingerprints of the substance were used to build principal component analysis (PCA) models. The effects of different spectral pretreatment processes such as auto-scaling, baseline correction, standard normal variate (SNV), first, and second derivatives were evaluated. The optimization of the model performance was established to ensure the sensitivity, specificity, and accuracy of the predicted models.
Results: Significant peaks corresponding to the properties of the compound were identified. For both bovine and plant-derived magnesium stearate, the peaks associated can be seen within the regions 2900cm-1 (C-H), 2800cm-1 (CH3), 1700cm-1 (C=O), and 1000-1300cm-1 (C-O). There was not much difference observed in the FTIR raw spectra of the samples from both sources. The quality and accuracy of the classification models by PCA and soft independent modeling classification analogy (SIMCA) have shown to improve using spectra optimized by first derivative followed by SNV smoothing.
Conclusion: This rapid and cost-effective technique has the potential to be expanded as an authentication strategy for halal pharmaceuticals.
MATERIALS AND METHODS: This scoping review was performed through electronic databases (PubMed and ScienceDirect) using keywords: 'spatial accessibility', 'floating catchment area' and 'factors'. Google Scholar and Mendeley Network were also used as additional sources to obtain relevant studies.
RESULTS: A total of 32 articles were included in this review. Factors identified can be distinguished into two broad categories, which are spatial and non-spatial factors. Spatial factors were remoteness or distance from the urban centre, areas in close proximity to main roads, and some specific geographical characteristics such as mountainous and deltaic regions, whereas non-spatial factors were the degree of urbanisation, population density and various demographic profiles of the population such as socioeconomic status, health need, and minority ethnic composition.
CONCLUSION: This study adds to the body of literature pertinent to the factors associated with spatial accessibility to healthcare services. These findings could give insight for researchers to consider and incorporate those additional variables to further improve the FCA-based method calculations.
OBJECTIVE: This scoping review aimed to identify and describe existing studies on pretravel health services provided by CPs, and the barriers, and facilitators.
METHODS: The PubMed, Science Direct, Scopus, and Web of Science databases were searched for pertinent studies from their inception to February 2023. A manual search was also conducted of prominent travel medicine journals, Google Scholar, and the reference lists of the included studies. Potential barriers and facilitators were mapped to the 14 domains of the Theoretical Domains Framework (TDF).
RESULTS: There were twelve studies included in the review. Pretravel health advice was the most prevalent form of pretravel health services. Within ten domains of the TDF, various factors that either facilitate or impede the provision of pretravel health services by CPs were identified.
CONCLUSION: The provision of pretravel health services by CPs may be affected by a number of practitioner and organizational factors. The provision of pretravel health services can be facilitated by informational resources, training and education in travel medicine, and collaboration amongst healthcare providers.