Changes in chemical properties and bioactivities of turmeric pigments by photo-degradation

Jung, Yu Na; Hong, Jungil

doi:10.3934/agrfood.2021045

Cited by 6 publications

(5 citation statements)

References 32 publications

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“…The paint, initially vibrant yellow in color, tends to become transparent after exposure to UV radiation. This occurrence can be ascribed to the process of photo-degradation susceptibility of the curcuma-based pigment [58][59][60]. The aesthetic degradation of the sample is slightly mitigated by the addition of the acrylic top layer in the CCT sample.…”

Section: Exposure To Uv-b Radiationmentioning

confidence: 99%

“…The concentration of curcuma, set at 5 wt.%, was chosen to achieve a bright yellow color that is sufficiently intense but still allows the distinctive veined texture of the wooden substrate to remain visible without being completely covered. Due to the susceptibility of the curcuma-based pigment to photo-degradation [58][59][60] and potential deterioration when exposed to liquids [61,62], an extra layer of pure transparent paint (T) was applied to sample CC, creating an extended sample defined as CCT. This additional layer served as a protective measure for the durability of the curcumin pigment.…”

Section: Samples Productionmentioning

confidence: 99%

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Eco-Friendly Multilayer Coating Harnessing the Functional Features of Curcuma-Based Pigment and Rice Bran Wax as a Hydrophobic Filler

Calovi,

Rossi

2023

Materials

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This work aims to highlight the multiple features shown by curcuma-based pigment and rice bran wax, which can be selectively employed as bio-based additives for the realization of multilayer wood coatings with multiple functionalities, harnessing the capabilities of the two environmentally friendly fillers, in line with current environmental sustainability trends. The role of the two green materials on the morphology of the composite layers was examined through observations employing scanning electron and optical microscopy, revealing a strong alteration of the film’s appearance, both its color and reflectivity. Additionally, their influence on the paint’s resilience was assessed by exposing the samples to UV-B radiation and consecutive thermal shocks. The coating displayed a clear and uniform change in color because of substantial curcuma powder photo-degradation but it remained exceptionally stable when subjected to thermal stresses. Moreover, the protective properties of the coatings were evaluated by conducting liquid resistance tests and water uptake tests, while the hardness and the abrasion resistance of the coatings were assessed to evaluate the effect of the additives on the mechanical properties of the coatings. In conclusion, this study showcases the promising joint action of curcuma-based pigment and rice bran wax in multilayer coatings. This combination offers vibrant yellow tones and an appealing appearance to the paint, enhances the surface’s water-repellent properties, and improves the mechanical resistance of the coatings.

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Section: Exposure To Uv-b Radiationmentioning

confidence: 99%

Section: Samples Productionmentioning

confidence: 99%

Eco-Friendly Multilayer Coating Harnessing the Functional Features of Curcuma-Based Pigment and Rice Bran Wax as a Hydrophobic Filler

Calovi,

Rossi

2023

Materials

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“…The impact of irradiation on the color stability of curcuminoids was examined and curcumin reagent (curcumin, DMC, and BMC; 79.4, 16.8, and 3.8% -w/w) was irradiated with fluorescent light (27 watt) for 24 hours using a household fluorescent lamp [30]. The color intensity was analyzed by measuring absorbance at 435 nm and curcuminoids before and after treatment were quantified using HPLC.…”

Section: Case Study-4mentioning

confidence: 99%

Colorimetric Measurement and Functional Analysis of Selective Natural Colorants Applicable for Food and Textile Products

Singhee¹,

Sarkar²

2022

Colorimetry

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Colouration of textiles as well as food products with natural colorants is an interesting subject with respect to the growing eco-concern among the consumers. Several colorants are available in nature for textile colouration and are renewable, biodegradable, and eco-friendly. Being safe for human consumption, they can serve the dual purpose of also coloring food. Several such natural dyes are available. This review chapter deals with the chemistry, extraction, application, and colorimetric analysis of colorants derived from turmeric (root), annatto (seeds), and cochineal (insect) for use on both textiles and food products.

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“…Curcuminoids are not chemically stable due to their highly reactive functional groups. Their chemical stability can be greatly affected by a variety of physical and chemical factors, including pH, temperature, and light [31][32][33]. Curcumin is relatively stable under acidic conditions, but its stability is reduced at alkaline pHs [34,35].…”

Section: Introductionmentioning

confidence: 99%

Interaction of Thiol Antioxidants with α,β-Unsaturated Ketone Moiety: Its Implication for Stability and Bioactivity of Curcuminoids

Lee,

Song,

Hong

2023

Molecules

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Many biological functions of curcumin have been reported. As certain bioactivities of curcumin are eliminated by antioxidants, reactive oxygen species generated by curcumin have been suggested as a relevant mechanism. In the present study, the effects of different types of antioxidants on the stability and bioactivities of curcumin were analyzed. High concentrations (>4 mM) of thiol antioxidants, including N-acetylcysteine (NAC), glutathione (GSH), and β-mercaptoethanol, accelerated the decomposition of curcumin and other curcuminoids; the submillimolar levels (<0.5 mM) of GSH and NAC rather improved their stability. Ascorbic acid or superoxide dismutase also stabilized curcumin, regardless of their concentration. The cellular levels and bioactivities of curcumin, including its cytotoxicity and the induction of heme oxygenase-1, were significantly reduced in the presence of 8 mM of GSH and NAC. The effects were enhanced in the presence of submillilmolar GSH and NAC, or non-thiol antioxidants. The present results indicate that antioxidants with a reduced thiol group could directly interact with the α,β-unsaturated carbonyl moiety of curcuminoids and modulate their stability and bioactivity.

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Changes in chemical properties and bioactivities of turmeric pigments by photo-degradation

Cited by 6 publications

References 32 publications

Eco-Friendly Multilayer Coating Harnessing the Functional Features of Curcuma-Based Pigment and Rice Bran Wax as a Hydrophobic Filler

Eco-Friendly Multilayer Coating Harnessing the Functional Features of Curcuma-Based Pigment and Rice Bran Wax as a Hydrophobic Filler

Colorimetric Measurement and Functional Analysis of Selective Natural Colorants Applicable for Food and Textile Products

Interaction of Thiol Antioxidants with α,β-Unsaturated Ketone Moiety: Its Implication for Stability and Bioactivity of Curcuminoids

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