Evaluation and Method Validation of Common Psychoactive Substances: Current Issues and Future Directions (Nicotine)

Abstract

Nicotine is one of the most commonly used psychoactive alkaloids worldwide. It is still very important in forensic science because it can be found in cigarettes, smokeless tobacco, nicotine replacement products, electronic nicotine delivery systems, and biological samples in poisoning or exposure cases. In forensic and analytical settings, working with nicotine requires clear differences between preliminary alkaloid screening, confirmatory identification, and validated quantitative methods. Classical colour and precipitation tests can suggest that an alkaloid is present but cannot establish its specific identity with scientific certainty. This paper reviews the history and physical properties of nicotine as well as chemical test and also define the causes or adverse effect of regular consumption of tobacco and different type of cigarette. The study also highlights current challenges such as matrix interference, variability in tobacco products, and limitations in field-level detection. Future directions emphasize advanced techniques like HPTLC, portable detection systems, and improved forensic applications.

Introduction

The document explains nicotine as a naturally occurring, highly addictive alkaloid found mainly in tobacco plants. It describes its chemical structure, rapid absorption into the body, and its action on nicotinic acetylcholine receptors, which triggers dopamine release and leads to addiction. Although nicotine can be used in controlled doses for smoking cessation, long-term exposure is associated with serious cardiovascular and neurological health risks. The history of nicotine is also outlined, from its early use by indigenous peoples to its isolation in 1828 and identification as the primary addictive substance in tobacco.

The text further compares the physical properties of different tobacco products such as cigarettes, cigars, clove cigarettes, and smokeless tobacco (zarda), highlighting differences in size, structure, filter type, smoke characteristics, and composition. Chemical analysis shows that these products contain nicotine along with harmful substances like tar, carbon monoxide, benzene, formaldehyde, nitrosamines, and other toxic compounds responsible for diseases such as cancer, COPD, and cardiovascular disorders.

The methodology describes nicotine extraction from tobacco using alkaline liquid–liquid extraction followed by chloroform separation to obtain crude nicotine for analysis. It also includes classical qualitative tests (Dragendorff’s, Mayer’s, and Wagner’s tests) used to detect alkaloids, which provide presumptive evidence of nicotine presence but are not fully confirmatory.

Conclusion

This study evaluates nicotine as a widely used psychoactive substance through various analytical techniques. The use of classical alkaloid tests, Thin Layer Chromatography, and UV-Visible spectrophotometry shows that nicotine can be identified and measured effectively. These methods are cost-effective and widely available. The successful validation of the method relies on parameters like linearity, accuracy, precision, limit of detection (LOD), and limit of quantification (LOQ), confirming its reliability for routine analytical and forensic use. However, the study also points out key limitations, including matrix interference, lack of specificity in preliminary tests, and lower sensitivity of traditional techniques. These issues highlight the need for ongoing improvements in analytical methods. Currently, integrating high-sensitivity techniques such as LC-MS/MS, better sample preparation methods, and portable detection systems can greatly improve the accuracy and usefulness of nicotine analysis. Overall, this research lays a solid analytical groundwork and suggests that future work should focus on enhancing sensitivity, specificity, and real-time detection capabilities. By incorporating modern technologies and standardized validation protocols, nicotine analysis can be further improved to meet the changing needs of forensic, clinical, and pharmaceutical sciences.

References

[1] https://www.researchgate.net/publication/390814836_UV_Spectrophotometric_Method_for_Estimation_of_Pure_Nicotine [2] https://www.researchgate.net/publication/291680554_A_simple_TLC_method_for_evaluation_of_nicotine_in_cigarettes [3] https://www.slideshare.net/slideshow/tobacco-smoking-history-and-typespptx/259755357 [4] https://www.bio-conferences.org/articles/bioconf/pdf/2024/23/bioconf_icon-beat2024_00022.pdf [5] https://www.mdpi.com/2227-9717/13/8/2371 [6] https://pmc.ncbi.nlm.nih.gov/articles/PMC3397803/pdf/nihms-378913.pdf [7] https://www.slideshare.net/slideshow/nicotine-in-tobacco/258571140 [8] https://www.sciencedirect.com/science/article/pii/S0039914025004199 [9] https://pubs.acs.org/doi/10.1021/acsomega.2c00089 [10] https://globalresearchonline.net/ijpsrr/v84-3/23.pdf [11] https://rfppl.co.in/public/uploads/article_issue/1764744339_692fdc938e314.pdf [12] https://www.researchgate.net/publication/336799413_SPECTROPHOTOMETRIC_DETERMINAT ON_OF_NICOTINE_IN_CIGARETTE_TOBACCO_AND_BIOLOGICAL_SAMPLES_OF_SMOKERS [13] https://www.slideshare.net/slideshow/investigation-of-nicotine-in-tobacco-products/57719381 [14] https://www.slideshare.net/slideshow/microcrystal-tests-for-detection-of-alkaloids/250591135 [15] https://pmc.ncbi.nlm.nih.gov/articles/PMC10235085/#:~:text=The%20microscopic%20analysis%20indicated%20that,use%20of%20SLT%20is%20prevalent. [16] https://pmc.ncbi.nlm.nih.gov/articles/PMC7980078/#:~:text=3.1.,1A%20and%201B). [17] https://www.pulsus.com/scholarly-articles/determination-of-level-of-nicotine-in-some-commercial-cigarettes-available-in-ethiopia-using-uvvis-spectrometer.pdf [18] https://www.researchgate.net/publication/352750880_Identification_and_Determination_of_nicotine_in_cigarettes_and_Tobacco_sold_in_Libyan_markets_using_various_analytical_methods [19] https://healthycanadians.gc.ca/en/open-information/tobacco/t300/ph [20] https://chemistnotes.com/natural/alkaloids-introduction-chemical-test/

Copyright

Copyright © 2026 Poorvi Tiwari, Dr. Mohd Athar. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.