1：Experimental Design and Method Selection:

The study involved a novel process using alkaline peroxide treatment followed by hydrolysis with low acid concentration to extract cellulose and nanocellulose from banana pseudostem, aiming to produce transparent films via solution casting.

2：Sample Selection and Data Sources:

Inner banana pseudostem (Musa sapientum) was collected from Nuevo Leon, Mexico, and processed through mechanical separation, cellulose extraction, and film preparation.

3：List of Experimental Equipment and Materials:

Chemicals included H2O2, NaOH, H2SO4, methylene blue; equipment included Bel Art 37250 Micro-Mill Grinder, autoclave, Thermo Scientific DXR Raman spectrometer, Leica DM 3000 light microscope, FEI Nova NanoSEM 200 SEM, ZEISS LSM 700 LSM, Agilent Cary 5000 UV–Vis-NIR spectrometer, Bruker D8 Advance XRD.

4：Experimental Procedures and Operational Workflow:

Steps included freeze-drying, milling, alkaline treatment, hydrolysis, neutralization, film casting, and drying. Characterization involved Raman spectroscopy, OM, SEM, LSM, UV-Vis-NIR, and XRD analyses.

5：Data Analysis Methods:

Data were analyzed using specific equations for transmittance and crystallinity index, with spectral and imaging techniques for qualitative and quantitative assessment.