UV-Vis spectroscopy combined with chemometrics for discriminating gamma-irradiated Javanese long pepper (Piper retrofractum Vahl) extractsAskur Rahman, Diana Nurus Sholehah and Ach. Faruk AlrosyidiEPJ Web Conf., 344 (2025) 01050DOI: https://doi.org/10.1051/epjconf/202534401050