Selective detection of azelnidipine in pharmaceuticals via carbon dot mediated spectrofluorimetric method: A green approach.

A spectrofluorimetric method using fluorescent carbon dots (CDs) was developed for the selective detection of azelnidipine (AZEL) pharmaceutical in the presence of other drugs. In this study, N-doped CDs (N-CDs) were synthesized through a single-step hydrothermal process, using citric acid and urea as precursor materials. The prepared N-CDs showed a highly intense blue fluorescence emission at 447 nm, with a photoluminescence quantum yield of ~21.15% and a fluorescence lifetime of 0.47 ns. The N-CDs showed selective fluorescence quenching in the presence of all three antihypertensive drugs, which was used as a successful detection platform for the analysis of AZEL. The photophysical properties, UV-vis light absorbance, fluorescence emission, and lifetime measurements support the interaction between N-CDs and AZEL, leading to fluorescence quenching of N-CDs as a result of ground-state complex formation followed by a static fluorescence quenching phenomenon. The detection platform showed linearity in the range 10-200 µg/ml (R2 = 0.9837). The developed method was effectively utilized for the quantitative analysis of AZEL in commercially available pharmaceutical tablets, yielding results that closely align with those obtained from the standard method (UV spectroscopy). With a score of 0.76 on the 'Analytical GREEnness (AGREE)' scale, the developed analytical method, incorporating 12 distinct green analytical chemistry components, stands out as an important technique for estimating AZEL.

An examination of energy efficiency retrofit scheme applications by low-income households in Ireland.

This paper studies the determinants of why low-income households in Ireland abandon energy efficiency retrofit applications using administrative data from a targeted energy efficiency grant. By applying for the scheme, the applicants overcome any financial barriers for undertaking retrofits and demonstrate their willingness to improve the energy efficiency of their dwellings. Hence this study contributes to the scarce literature on non-financial barriers preventing low-income households from undertaking energy efficiency retrofits. Contrary to previous findings, we find that the higher the number of retrofits to be implemented, the lower the probability of households abandoning their applications. We also find that planning to undertake retrofits such as ventilation, which can significantly improve the health and safety standards of the dwelling, is associated with a higher probability of abandonment. Both findings indicate the presence of key behavioural and informational barriers which prevent low-income households from fully comprehending the purpose or benefits of proposed energy efficient retrofits. Our findings also suggest that higher grant expenditure on dwellings with poor pre-works energy efficiency rating and on retrofits such as attic insulation and heating system upgrades may have the highest energy efficiency improvements per unit of expenditure. Within the constraints of limited budgets for retrofit grant supports, this research can inform the redesign of grant schemes to achieve the greatest aggregate improvements in residential building energy efficiency.

An In Vitro Study to Evaluate and Compare the Hemocompatibility of Titanium and Zirconia Implant Materials after Sandblasted and Acid-etched Surface Treatment.

AIM: This study was aimed to investigate the hemocompatibility of zirconia and titanium implant materials after surface treatment with sandblasting and acid etching (SLA). MATERIALS AND METHODS: Sixty specimens were procured from manufacturers of dimension 10mm × 3mm, thirty of each were prefabricated medical grade titanium (Ti-6Al-4V) and thirty of sintered zirconia. Silicon carbide grit papers of 240 to 1200pm, was used to polish the specimen surface. The surfaces were rinsed with water to remove any remnant particles after polishing. Later ultrasonic cleaning was done for 5 minutes using distilled water. The control specimens included 15 specimens each from titanium (groups A1) and zirconia (groups B1). The remaining 15 specimens (groups A2 and B2) were sandblasted using alumina particles of 150 microns particle size and using 20% hydrochloric acid, acid etching was done for 30 seconds. The specimens were scanned under electron microscope after surface treatment for analysis purpose and evaluated for surface characteristics. Before the exposure of specimens to blood, percentage hemolysis, prothrombin, platelet aggregation and activation, and thrombin time values were calculated. one mL of blood was added to each specimen for testing. The values before and after the exposure of specimens to blood were noted. Using a t-test, the values noted were statistically Results: A1 (polished titanium) showed highest mean values after exposure, in platelet count (184.67 ± 1.29), leucocyte count (7.27 ± 0.08), and thrombin time (10.15 ± 0.34) while prothrombin time's highest mean value after exposure were showed by A2 (SLA treated titanium) with a mean value of 10.04 ± 0.24. CONCLUSION: Surface treatment with sandblasting and acid etching (SLA) using 150 microns alumina particles and 20% hydrochloric acid increased the surface roughness of the titanium and zirconia implant materials and polished titanium showed maximum hemocompatibility. CLINICAL SIGNIFICANCE: The implant's success depends on its biocompatibility and its property of osseointegration. The adverse interaction between blood and the artificial surface is detected by the hemocompatibility test for medical materials, to know if the surface can activate or destruct the blood components. The success of implant placement also depends on the interaction between the blood and the specimen.