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<p>Turmeric oleoresin (TO), a curcuminoid-rich organic extract, exhibits many health benefits. This study investigated the impact of common household white light-emitting diode (LED) lights including natural, cool, and warm white on photostability, bioactivities, and photosensitivity of TO. All three LEDs (5–20 W/m<sup>2</sup>) significantly degraded turmeric pigment in TO, reducing its color intensity and levels of individual curcuminoid (curcumin, demethoxycurcumin, bisdemethoxycurcumin). Cool LED light proved most detrimental to stability, followed by natural and warm LEDs. Exposure to LEDs also decreased total polyphenol levels and reduced the scavenging activities of TO against 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)&#xa0;and 2,2-diphenyl-1-picrylhydrazyl radicals. Furthermore, the photosensitizing properties of TO, particularly potent under cool LED, were significantly diminished after irradiation by all white LEDs; the cytotoxicity activity of TO irradiated by each white LED was also reduced. These findings indicate instability of turmeric pigment under routinely used household LED irradiation, especially cool LED, suggesting careful consideration for storing and distributing turmeric-containing products.</p>

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Effects of exposure to household white light-emitting diode lights on the photostability, bioactivities, and photosensitivity of turmeric pigment

  • 期刊论文

  • 发表日期：

    2025年12月13日

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  • Juyeon Oh,
  • Jungil Hong

摘要

Turmeric oleoresin (TO), a curcuminoid-rich organic extract, exhibits many health benefits. This study investigated the impact of common household white light-emitting diode (LED) lights including natural, cool, and warm white on photostability, bioactivities, and photosensitivity of TO. All three LEDs (5–20 W/m2) significantly degraded turmeric pigment in TO, reducing its color intensity and levels of individual curcuminoid (curcumin, demethoxycurcumin, bisdemethoxycurcumin). Cool LED light proved most detrimental to stability, followed by natural and warm LEDs. Exposure to LEDs also decreased total polyphenol levels and reduced the scavenging activities of TO against 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) and 2,2-diphenyl-1-picrylhydrazyl radicals. Furthermore, the photosensitizing properties of TO, particularly potent under cool LED, were significantly diminished after irradiation by all white LEDs; the cytotoxicity activity of TO irradiated by each white LED was also reduced. These findings indicate instability of turmeric pigment under routinely used household LED irradiation, especially cool LED, suggesting careful consideration for storing and distributing turmeric-containing products.