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Design and Evaluation of a Inonotus obliquus-AgNP-Maltodextrin Delivery System: Antioxidant, Antimicrobial,

Ana-Maria Stanoiu¹, Cornelia Bejenaru^2,3, Adina-Elena Segneanu⁴

¹Department of Surgery, Faculty of Medicine, Victor Babeş University of Medicine and Pharmacy Timişoara, 2 Eftimie Murgu Square, 300041 Timişoara, Romania.

|August 14, 2025

Abstract:

Inonotus obliquus, a medicinal mushroom valued for its bioactive compounds, has not been previously characterized from Romanian sources. This study presents the first comprehensive chemical and biological screening of I. obliquus, introducing novel polymer-based encapsulation systems to enhance the stability and bioavailability of its bioactive constituents. Two distinct delivery systems were designed to enhance the functionality of I. obliquus extracts: (i) microencapsulation in maltodextrin (MIO) and (ii) a sequential approach involving preparation of silver nanoparticle-loaded I. obliquus (IO-AgNPs), followed by microencapsulation to yield the hybrid MIO-AgNP system. Comprehensive metabolite profiling using GC-MS and ESI-QTOF-MS revealed 142 bioactive constituents, including terpenoids, flavonoids, phenolic acids, amino acids, coumarins, styrylpyrones, fatty acids, and phytosterols. Structural integrity and successful encapsulation were confirmed by XRD, FTIR, and SEM analyses. Both IO-AgNPs and MIO-AgNPs demonstrated potent antioxidant activity, significant acetylcholinesterase inhibition, and robust antimicrobial effects against Staphylococcus aureus, Bacillus cereus, Pseudomonas aeruginosa, and Escherichia coli. Cytotoxicity assays revealed pronounced activity against MCF-7, HCT116, and HeLa cell lines, with MIO-AgNPs exhibiting superior efficacy. The synergistic integration of maltodextrin and AgNPs enhanced compound stability and bioactivity. As the first report on Romanian I. obliquus, this study highlights its therapeutic potential and establishes polymer-based nanoencapsulation as an effective strategy for optimizing its applications in combating microbial resistance and cancer.

Keywords:

Inonotus obliquus anti-acetylcholinesterase activity antimicrobial screening antioxidant potential in vitro cytotoxicity micro-spray encapsulation silver nanoparticles

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