He–Ne laser irradiation enhances curcuminoid content in Curcuma longa: a green strategy for functional antioxidants and antimicrobial ingredients
Year: 2026
Type: article
Abstract: Introduction Curcuma longa rhizomes are rich in curcuminoids with strong antioxidant and antimicrobial activities. Sustainable post-harvest strategies are needed to enhance these bioactive metabolites for functional food applications. Methods Fresh rhizomes were irradiated with a He–Ne laser for 5, 10, or 15 min. Ethanol extracts were analyzed by High Performance Liquid Chromatography analysis (HPLC) to quantify curcuminoids. Antioxidant activity was evaluated using 2,2-diphenyl-1-picrylhydrazyl (DPPH) assays, and antibacterial activity tested against Escherichia coli ( E. coli ), Staphylococcus aureus ( S. aureus ), and Streptococcus pyogenes ( S. pyogenes ). Results Laser treatment increased curcuminoid content in a time-dependent manner, with 15-min exposure yielding the highest bisdemethoxycurcumin enrichment. Antioxidant assays showed strong scavenging potential, with IC50 values of 0.71 (10-min) and 0.69 mg mL −1 (15-min). Extracts exhibited enhanced antibacterial activity, with 15-min exposure strongest against E. coli and S. aureus , while 10-min treatment yielded higher inhibition of S. pyogenes . Discussion He–Ne laser irradiation is an effective green technique to improve the antioxidant and antimicrobial properties of C. longa extracts, supporting their use as natural functional ingredients.
Source: Frontiers in Nutrition
Author: Munirah F. Aldayel
Institution: King Faisal University
Language: English
Subfield: Molecular Medicine
Domain: Life Sciences
Open Access status: gold
Estimated APC paid: $3,801
Funder: King Faisal University
OpenAlex ID: W7130407207