Exploring Co-Amorphous Formulations Of Nevirapine: Insights From Computational, Thermal, And Solubility Analyses.

This study aimed to assess the formation of nevirapine (NVP) co-amorphs systems (CAM) with different co-formers (lamivudine-3TC, citric acid-CAc, and urea) through combined screening techniques as computational and thermal studies, solubility studies; in addition to develop and characterize suitable NVP-CAM. NVP-CAM were obtained using the quench-cooling method, and characterized by differential scanning calorimetry (DSC), X-ray diffractometry (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and polarized light microscopy (PLM), in addition to in vitro dissolution in pH 6.8. The screening results indicated intermolecular interactions occurring between NVP and 3TC; NVP and CAc, where shifts in the melting temperature of NVP were verified. The presence of CAc impacted the NVP equilibrium solubility, due to hydrogen bonds. DSC thermograms evidenced the reduction and shifting of the endothermic peaks of NVP in the presence of its co-formers, suggesting partial miscibility of the compounds. Amorphization was proven by XRD and PLM assays. In vitro dissolution study exhibited a significant increase in solubility and dissolution efficiency of NVP-CAM compared to free NVP. Combined use of screening studies was useful for the development of stable and amorphous NVP-CAM, with increased NVP solubility, making CAM promising systems for combined antiretroviral therapy.

Chitosan-Based Films with 2-Aminothiophene Derivative: Formulation, Characterization and Potential Antifungal Activity.

In this study, films of chitosan and 2-amino-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carbonitrile (6CN), a 2-aminothiophene derivative with great pharmacological potential, were prepared as a system for a topical formulation. 6CN-chitosan films were characterized by physicochemical analyses, such as Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and scanning electronic microscopy (SEM). Additionally, the antifungal potential of the films was evaluated in vitro against three species of Candida (C. albicans, C. tropicalis, and C. parapsilosis). The results of the FTIR and thermal analysis showed the incorporation of 6CN in the polymer matrix. In the diffractogram, the 6CN-chitosan films exhibited diffraction halos that were characteristic of amorphous structures, while the micrographs showed that 6CN particles were dispersed in the chitosan matrix, exhibiting pores and cracks on the film surface. In addition, the results of antifungal investigation demonstrated that 6CN-chitosan films were effective against Candida species showing potential for application as a new antifungal drug.

Potential of plant-based polysaccharides as therapeutic agents in ulcerogenic diseases of the gastrointestinal tract: A review.

In recent years, natural polysaccharides (PSs) have attracted increasing interest because of their remarkable biological properties and potential in various areas, such as medicine, and food. This study aimed to present a detailed review of the evidence on the therapeutic potential of PSs for the treatment of gastrointestinal diseases. The main evidence was correlated with their chemical composition, mechanism of action and therapeutic effect. The main results showed that the action can be attributed to their ability to suppress excessive inflammatory responses, regulating the expression of cytokines and interleukins, reducing intestinal inflammation and promoting wound healing. Furthermore, we discussed how PSs help in the repair of the intestinal mucosa and related these effects with the composition of monosaccharides. A detailed analysis was performed on the ability of PSs to modulate the intestinal microbiota, promoting the growth of beneficial bacteria and suppressing inflammatory bacteria, in addition to its probiotic action with production of short-chain fatty acids. All this evidence was also taken into a broader context, in which the main challenges in processing PSs were considered and strategies to circumvent them were pointed out. Therefore, this review sought to demonstrate the great potential and viability of PSs as innovative and effective therapeutic agents.

Development of the stability-indicating method, structural elucidation of new photodegradation products from terconazole by LC-MS TOF, and in vitro toxicity.

Terconazole (TCZ) was the first triazole antifungal drug launched in the market and has been used in the treatment of vulvovaginal candidiasis. It is also indicated to treat dermatophytosis and fungal ocular infections. However, some of the degradation products from triazole drugs have been reported to be toxic, justifying the need of further investigations about the stability of TCZ. identification of its degradation products and evaluation of their toxicity considering the new possibilities of therapeutic indications. Therefore, in this work a systematic investigation regarding photostability of TCZ was conducted. The active pharmaceutical ingredient (API) and its methanolic solution (100 µg mL-1) were kept into a photostability chamber under a UV light (200 Wh/m2; 1.2 × 106 lux/h) during 5 days and 90 min, respectively. A high-efficiency liquid chromatography method was developed for separation and identification of TCZ and its degradation products. The solid-state API remained stable throughout the test, whereas an extensive degradation was observed when in solution. In this case, four degradation products not yet reported in the literature were identified and characterized by electrospray ionization high-resolution quadrupole time-of-flight mass spectrometry (ESI-QTOF-MS). Two degradation products presented m/z of 498 and the other two of 496 and 464, respectively. The results suggest that the degradation follows a first-order kinetic and involves the loss of chlorine atoms from the 2,4-dichlrophenyl moiety. Finally, TCZ submitted to the same stress condition as the API solution, increased significantly the opacity during the bovine corneal opacity and permeability test method (BCOP) indicating a potential to cause ocular toxicity. Further studies using the pure photolysis degradation products of TCZ characterized in this work are still necessary to confirm this find.

Acetylated cashew gum and fucan for incorporation of lycopene rich extract from red guava (Psidium guajava L.) in nanostructured systems: Antioxidant and antitumor capacity.

Industrial application of lycopene is limited due to its chemical instability and low bioavailability. This study proposes the development of fucan-coated acetylated cashew gum nanoparticles (NFGa) and acetylated cashew gum nanoparticles (NGa) for incorporation of the lycopene-rich extract from red guava (LEG). Size, polydispersity, zeta potential, nanoparticles concentration, encapsulation efficiency, transmission electron microscopy (TEM) and atomic force microscopy (AFM) were used to characterize nanoparticles. The antioxidant activity was determinated and cell viability was evaluated in the human breast cancer cells (MCF-7) and human keratinocytes (HaCaT) by MTT assay. The toxic effect was evaluated by hemolysis test and by Galleria mellonella model. NFGa showed higher stability than NGa, having a size of 162.10 ± 3.21 nm, polydispersity of 0.348 ± 0.019, zeta potential -30.70 ± 0.53 mV, concentration of 6.4 × 109 nanoparticles/mL and 60% LEG encapsulation. Microscopic analysis revealed a spherical and smooth shape of NFGa. NFGa showed antioxidant capacity by ABTS method and ORAC assay. The NFGa presented significant cytotoxicity against MCF-7 from the lowest concentration tested (6.25-200 µg/mL) and did not affect the cell viability of the HaCaT. NFGa showed non-toxic effect in the in vitro and in vivo models. Therefore, NFGa may have a promising application in LEG stabilization for antioxidant and antitumor purposes.

Structural characterization, antifungal and cytotoxic profiles of quaternized heteropolysaccharide from Anadenanthera colubrina.

In the present work, we investigated the minimal inhibitory concentration (MIC) against fungal strains (Fonsecaea pedrosoi, Microsporum canis, Candida albicans, Cryptococcus neoformans), and cytotoxicity to normal cell lines for modified red angico gum (AG) with eterifying agent N-chloride (3-chloro-2-hydroxypropyl) trimethylammonium (CHPTAC). Quaternized ammonium groups were linked to AG backbone using N-(3-chloro-2-hydroxypropyl) trimethylammonium chloride. The chemical features of the quaternized gum derivatives (QAG) were analyzed by: FTIR, elemental analysis, Zeta potential and gel permeation chromatography. The angico quaternizated gum presented a degree of substitution (DS) of 0.22 and Zeta potential of +36.43. For the antifungal test, it was observed that unmodified gum did not inhibit fungal growth. While, QAG inhibited the growth of most fungi used in this study. By AFM technique QAG interacted with the fungal surface, altering wall roughness significantly. The probable affinity of fragments of the QAG structure for the fungal enzyme 5I33 (Adenylosuccinate synthetase) has been shown by molecular docking. Low cytotoxicity was observed for polymers (unmodified gum and QAG). The results demonstrate that the quaternized polymer of AG presented in this study is a quite promising biomaterial for biotechnological applications.

Consensual improvement actions for the Tuberculosis Control Programme in Pernambuco state, Brazil: an e-Delphi study.

OBJECTIVES: Tuberculosis (TB) remains a major public health problem, particularly in low and middle-income countries. The aim of this study is to consensualise improvement actions for the Tuberculosis Control Programme of the Pernambuco state (SPTC), Brazil. METHODS: Firstly, a preliminary workshop was conducted with experts (n = 8), including key stakeholders and health professionals, to select structure and process indicators pertaining to the tuberculosis control programme. Then, an e-Delphi was carried out with a purposive sample of 11 local TB experts. The first-round questionnaire was comprised of 19 open-ended questions on possible improvement actions, based on programme indicators obtained in the previous stage. In the second-round experts rated each action for relevance and feasibility, using a four-point scale. In the last round the participants rated the actions again, in the light of group's answers. We used published criteria to define consensus at the outset of the study. KEY FINDINGS: Eighty-nine improvement actions achieved a high degree of consensus in both feasibility and relevance in round three. Eighty-six actions were grouped under 19 structure and process indicators, while three were consideredcross-sectional in scope (i.e. related to more than one indicator). Ten out of the 86 actions obtained at least 70% of ratings on the highest score of the scale both for relevance and feasibility. These included: "Request and availability of sputum pots can be made by any health professional in the health unit". CONCLUSIONS: The wide array of actions obtained in this Delphi represent a resource from which local SPTC services can select the actions most suitable for each context. The ten most relevant and feasible actions represent a particularly useful starting point to streamline change and potentially improve programme indicators.

Obtaining the palygorskite:chitosan composite for modified release of 5-aminosalicylic acid.

This study's aim was to obtain composites from palygorskite (PLG) and chitosan (CS) in order to modify 5-aminosalicylic (5-ASA) release. Initially, the PLG:CS composite was obtained using glutaraldehyde (GLA) as a reticular agent. Then, PLG, CS and PLG:CS were characterized by means of analytical techniques such as CHN elemental analysis, surface area analysis, XRD, FTIR, DSC and TG, SEM, adsorption tests and release profiles. Based on analytical data, the formation of the PLG:CS composite which showed the presence about 19% of CS, decrease in specific surface area, morphological analysis modified, visible change of crystallinity, of FTIR and thermal analysis. In relation to the drug-composite interaction, PLG:CS exhibited a significant increase in adsorption with 5-ASA at 58.24% in relation to PLG and CS which were at 16.29% and 23.96% respectively. The release profiles show that the PLG:CS composite changed the 5-ASA release speed in analyzed simulated fluids (intestinal and stomach) unlike other systems. Thus, the PLG:CS composite with proven synergy of the PLG and CS inherent properties showing 5-ASA effective modified release. Hence, this composite has potential benefits for the vectorization of drugs.