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2000
Volume 22, Issue 5
  • ISSN: 1567-2018
  • E-ISSN: 1875-5704

Abstract

Introduction

Although lignin is one of the most naturally abundant biopolymers, the overall status of its utilization has long been subpar. The ability of Lignin to readily self-assemble into nanoparticles, along with its good biocompatibility and minimal toxicity, makes it a perfect agent for nanocarriers and drug delivery.

Method

Hence, in this study, we have attempted to examine lignin nanoparticles (LNPs) as an efficient pH-responsive nanocarrier for gastric-irritant oral NSAID, aspirin. Alkali lignin (AL) was extracted from rice straw alkaline treatment, and the lignin nanoparticles were synthesized from lignin using the acid precipitation method. The average particle size was 201.37 ± 1.20 nm, and the synthesized LNPs exhibited a spherical shape and smooth outer surface along with high polydispersity (PDI= 0.284 ± 0.012). The LNPs showed moderate hemocompatibility during hemolysis studies. The nanoparticles presented nearly similar chemical structures to the AL from which they were developed, and the FT-IR absorption spectra confirmed the similarity of this chemical structure to the LNPs and AL. Aspirin was successfully loaded into the LNPs with a satisfactory drug loading value of 39.12 ± 1.50 and an excellent encapsulation efficiency value of 91.44 ± 0.59.

Results

Finally, the LNPs were capable of protecting the loaded drug at the acidic pH of the stomach (1.2) with just 29.20% release of the loaded aspirin after 10 h of observation . Contrarily, the LNPs were capable of rapidly releasing the aspirin at the basic pH of the intestine (7.4) with nearly 90% release of the loaded drug after 10 h observation The basic pH of the intestine might lead to gradual dissociation of the LNPs followed by swift release of the loaded cargo.

Conclusion

These findings substantiate that the LNPs carry the potential to be an apt and safe nanocarrier for oral drugs like aspirin as well as parenteral drugs, and LNPs can be utilized as an efficient alternative to enteric coating.

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2025-10-09

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Lignin Nanoparticles as pH-responsive Nanocarriers for Gastric-Irritant Oral Drug Aspirin
Curr. Drug Deliv. 22, 617 (2025); https://doi.org/10.2174/0115672018318035240910050003
/content/journals/cdd/10.2174/0115672018318035240910050003
/content/journals/cdd/10.2174/0115672018318035240910050003
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  • Article Type:     Research Article
Keyword(s): alkali lignin; Aspirin; drug delivery; drug delivery vehicles; enteric-coated drugs; gastric-irritant drugs; nanocarriers; nanoparticles; oral drugs

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