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Spectrophotometry; Green chemistry; Antiviral drugs; Antifungal drugs; Antidiabetic drugs; Copper determination; Pharmaceutical analysis; Biological samples; Antihyperlipidemic drugs; Antidepressant drugs; Antimalarial drugs; Antihypertensive drugs; Acetaminophen; Carbon quantum dots; MOF-based electrodes

Introduction

Research describes a sensitive spectrophotometric approach for copper quantification in various environmental and biological matrices. This method hinges on the formation of a complex between copper(II) and 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) in an acidic environment. The technique boasts good linearity, low detection limits, and high accuracy, proving useful for routine analysis in environmental monitoring and clinical diagnostics [1].

Moving into drug analysis, highly sensitive and selective spectrophotometric methods have been introduced for quantifying several antiviral drugs. These methods are applicable in pharmaceutical formulations and human plasma. Leveraging derivatization reactions, they enable precise analysis, critical for drug quality control and therapeutic monitoring. The robustness of this approach is evident in its minimal interference from complex biological matrices [2].

In the realm of antifungal medications, novel spectrophotometric and spectrofluorimetric methods exist for determining fluconazole and voriconazole. These techniques utilize carbon quantum dots (CQDs) as sensitive probes, which enhance analytical performance due to their unique optical properties. This dual-mode strategy offers high sensitivity and specificity, providing versatile tools for pharmaceutical analysis [3].

Shifting focus to environmentally conscious practices, a green spectrophotometric method has been developed for quantifying antidepressant drugs in pharmaceutical formulations. This approach prioritizes eco-friendly reagents and procedures, aligning with sustainable analytical chemistry principles. It demonstrates excellent accuracy and precision, presenting a viable option for quality control without compromising environmental integrity [4].

Furthering the green chemistry initiative, researchers have developed another novel, green, and sensitive spectrophotometric method specifically for determining antimalarial drugs in pharmaceutical dosage forms. This particular method emphasizes reducing hazardous waste and solvent consumption while maintaining high sensitivity for accurate drug quantification. This innovation offers a sustainable and effective tool for pharmaceutical quality control [5].

A green and sensitive spectrophotometric method also exists for quantifying various antihyperlipidemic drugs in both pharmaceutical formulations and biological fluids. This method employs environmentally benign reagents and procedures, offering a sustainable analytical solution. Its high sensitivity and applicability to biological matrices make it invaluable for pharmacokinetic studies and therapeutic monitoring [6].

An intelligent spectrophotometric method has been introduced for the simultaneous quantification of five antidiabetic drugs, specifically in binary and ternary mixtures with metformin. This method incorporates advanced chemometric tools to resolve spectral overlaps, showcasing excellent selectivity and accuracy in complex pharmaceutical samples. It streamlines the analysis of multi-component drug formulations, enhancing efficiency in quality control [7].

Another smart spectrophotometric method has been developed to determine several antidiabetic drugs within pharmaceutical formulations. This technique employs innovative sample treatment and detection strategies to boost sensitivity and specificity. It provides a reliable and efficient tool for routine quality control of these crucial medications, helping to ensure their potency and safety [8].

A green spectrophotometric method is also available for determining specific antihypertensive drugs, utilizing indigo carmine as a chromogenic reagent. This method prioritizes environmental sustainability by employing non-toxic reagents and minimizing waste. Its analytical performance shows excellent precision and accuracy, making it suitable for pharmaceutical quality control and contributing to a reduced environmental impact [9].

Beyond drug analysis, a novel Cu-BDC-MOF-based carbon paste electrode has been fabricated for the sensitive determination of acetaminophen. This method combines square wave adsorptive stripping voltammetry with spectrophotometry for enhanced detection. This integrated approach delivers superior sensitivity and selectivity, highlighting its potential for accurate quantification in complex matrices, such as food samples [10].

Description

Spectrophotometric techniques remain central to analytical chemistry, providing precise and sensitive methods for quantifying various substances across diverse matrices. For instance, the determination of copper in environmental and biological samples benefits from a highly sensitive spectrophotometric method that relies on forming a complex with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) in an acidic medium [1]. This approach shows good linearity, detection limits, and accuracy, making it practical for routine analysis in areas like environmental monitoring and clinical diagnostics. Such methods are fundamental in ensuring the safety and quality of various materials.

In the pharmaceutical sector, spectrophotometry plays a crucial role in drug analysis and quality control. Highly sensitive and selective spectrophotometric methods have been developed for quantifying antiviral drugs in both pharmaceutical formulations and human plasma. These methods often leverage derivatization reactions to achieve accurate and precise results, which are vital for therapeutic drug monitoring and ensuring drug efficacy. Their robustness against matrix interference makes them suitable for complex biological samples [2]. Similarly, antifungal drugs like fluconazole and voriconazole can be determined using novel spectrophotometric and spectrofluorimetric methods that incorporate carbon quantum dots (CQDs). The unique optical properties of CQDs act as sensitive probes, leading to enhanced analytical performance and offering high sensitivity and specificity for versatile pharmaceutical analysis [3].

The drive towards sustainability has led to the development of green spectrophotometric methods. For example, antidepressant drugs in pharmaceutical formulations can now be quantified using environmentally friendly reagents and procedures. This aligns with sustainable analytical chemistry principles, demonstrating excellent accuracy and precision while minimizing environmental impact [4]. This green philosophy extends to antimalarial drugs, where a novel and sensitive spectrophotometric method focuses on reducing hazardous waste and solvent consumption. This innovation provides a sustainable and effective tool for pharmaceutical quality control [5]. Antihyperlipidemic drugs are also covered by green and sensitive spectrophotometric methods, applicable to pharmaceutical formulations and biological fluids, making them valuable for pharmacokinetic studies and therapeutic monitoring [6]. Furthermore, antihypertensive drugs can be determined using a green spectrophotometric method that employs indigo carmine as a chromogenic reagent, prioritizing non-toxic reagents and waste minimization while ensuring excellent precision and accuracy for quality control [9].

Advancements also include the integration of 'smart' approaches and novel materials. One smart spectrophotometric method enables the simultaneous quantification of five antidiabetic drugs in binary and ternary mixtures with metformin. This technique uses advanced chemometric tools to resolve spectral overlaps, delivering excellent selectivity and accuracy for complex pharmaceutical samples, thereby enhancing efficiency in quality control [7]. Another smart spectrophotometric method focuses on determining several antidiabetic drugs in pharmaceutical formulations through innovative sample treatment and detection strategies, ensuring reliability and efficiency for routine quality control [8]. Beyond pure spectrophotometry, methods like the fabrication of a Cu-BDC-MOF-based carbon paste electrode for acetaminophen determination combine square wave adsorptive stripping voltammetry with spectrophotometry. This integrated approach offers superior sensitivity and selectivity, indicating its potential for accurate quantification in challenging matrices such as food samples [10]. These diverse applications highlight the adaptability and continuous evolution of spectrophotometric techniques across various scientific disciplines.

Conclusion

The collected research highlights the versatility and advancement of spectrophotometric methods across various analytical challenges. These studies detail techniques for quantifying a wide range of substances, from environmental copper to diverse pharmaceutical drugs, often emphasizing sensitivity, selectivity, and accuracy. A significant trend involves the development of 'green' spectrophotometric methods, prioritizing environmentally friendly reagents and procedures for drugs like antidepressants, antimalarials, antihyperlipidemics, and antihypertensives. Additionally, 'smart' spectrophotometric approaches incorporate advanced tools, such as chemometrics, for simultaneous quantification of complex drug mixtures, particularly antidiabetic drugs. The application extends to novel materials like carbon quantum dots for antifungal drug determination and MOF-based electrodes for acetaminophen, enhancing detection capabilities. Collectively, these papers showcase the continuous evolution of spectrophotometry, providing robust, sustainable, and highly effective analytical tools for quality control, environmental monitoring, and clinical diagnostics in complex matrices.

References

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