Aluminium and calcium lake pigments of Lac natural dye

Jimtaisong, Ampa

doi:10.1590/s2175-97902019000418140

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…The obtained LWP has been fully characterized. FESEM images reveal a homogeneous nanostructured grape-like morphology (Figure a); , the fine granulometry of the pigment (ca. 100 nm) can be advantageous in guaranteeing a good color rendering when an excellent dispersion in the matrix is obtained, avoiding agglomeration phenomena which affect the mechanical properties of the polymers.…”

Section: Resultssupporting

confidence: 79%

Historically Inspired Strategy to Achieve Sustainable and Effective Coloration of Bioplastics

Clementi

Dominici

Luzi

et al. 2023

ACS Sustainable Chem. Eng.

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The use of historical organic pigments is an interesting strategy to provide color nuances to biopolymers while achieving good solid optical effects. In this work, aqueous extracts of logwood (LW) are tested as a natural source of color for the sustainable production of an organic purple pigment (LWP) taking advantage of the historical lake approach. Different amounts of LWP (0.01−2% wt) are used for the effective coloration of polycaprolactone (PCL), polybutylene succinate (PBS), and polylactide (PLA). The full characterization of LWP and LWP-treated biopolymer samples enables the spectral and color properties of the composites to be defined where the exceptional color efficiency of LWP is demonstrated by the very low amount (0.5% wt) necessary to reach the saturation. The evolution of spectra and color coordinates under accelerated aging conditions is monitored for LWPpolymer samples. A 10−12% decrease of the visible absorption band is detected after prolonged irradiation, resulting in a moderate color fading for PBS compared to PCL samples, while negligible changes are observed for PLA samples. The results demonstrate that LWP constitutes an efficient and sustainable source of color for the analyzed polymers without causing significant changes in the tensile and thermal properties of the polymeric matrix.

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Section: Resultssupporting

confidence: 79%

Historically Inspired Strategy to Achieve Sustainable and Effective Coloration of Bioplastics

Clementi

Dominici

Luzi

et al. 2023

ACS Sustainable Chem. Eng.

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“…Laccaic acid A (40.42%), E (20%) and B (17.66%) are major components of dye, whereas laccaic acid C (2.54%) and D (1.51%) are minor components (Hong et al , 2011). Lac dye is used as a natural food colorant (Divya et al , 2011), cosmetics colorant (Jimtaisong, 2020) and textile colorant (Wei et al , 2013); however, its potential application as a colorimetric indicator for intelligent packaging has not been explored yet. All compounds those can act as indicator have specific acid dissociation constant (pKa) values, which indicate the degree of ionization of molecules in solution at different pH values (Kumar, 2011).…”

Section: Introductionmentioning

confidence: 99%

UV-Vis spectroscopic investigation on color change kinetics of lac dye as influenced by some food spoilage metabolites: validation for milk quality monitoring

Sakare

Giri

Mohapatra

et al. 2022

PRT

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Purpose This paper aims to study the color change kinetics of lac dye in response to pH and food spoilage metabolites (ammonia, lactic acid and tyramine) for its potential application in intelligent food packaging. Design/methodology/approach UV-Vis spectroscopy was used to study the color change of dye solution. Ratio of absorbance of dye solution at 528 nm (peak of ionized form) to absorbance at 488 nm (peak of unionized form) was used to study the color change. Color change kinetics was studied in terms of change in absorbance ratio (A528/A488) with time using zero- and first-order reaction kinetics. An indicator was prepared by incorporating lac dye in agarose membrane to validate the result of study for monitoring quality of raw milk. Findings Dye was orange-red in acidic medium (pH: 2 to 5) and exhibited absorbance peak at 488 nm. It turned purple in alkaline medium (pH: 7 to10) and exhibited absorbance peak at 528 nm. The change in absorbance ratio with pH followed zero-order model. Acid dissociation constant (pKa) of dye was found to be 6.3. Color change of dye in response to ammonia and tyramine followed zero-order reaction kinetics, whereas for lactic acid, the first-order model was found best. In the validation part, the color of the indicator label changed from purple to orange-red when the milk gets spoiled. Originality/value The study opens a new application area for lac dye. The results suggest that lac dye has potential to be used as an indicator in intelligent food packaging for detection of spoilage in seafood, meat, poultry and milk.

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“…Natural dyes can be transformed into lake pigments, which can impart patterns, richness, and volume to painting products, including cloth, cosmetics, and toys, resulting in the wide application of natural dyes [34,35]. Lake pigments or lake colors can be easily prepared by fixing natural dyes with a substrate using precipitation or adsorption method [36][37][38][39][40]. The precipitation method requires inert binders or mordants such as potassium aluminum sulfate (most frequently used), tannin, and other soluble salts of metal, including iron, tin, copper and aluminium whereas adsorption method needs adsorbents, such as clay, aluminium oxide, aluminium hydroxide, and montmorillonite [41][42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Eco-friendly lake pigment from sappanwood: Adsorption study and its application as natural colorant for natural rubber toy balloon

et al. 2021

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Due to the awareness of the impact of synthetic dye on human health and the environment, natural dye and lake pigment have attracted considerable attention from researcher. Herein, pink−red lake pigment from sappanwood was prepared using adsorption approach. The effects of initial pH, pH and concentration of brazilein solution, dosage of aluminium hydroxide, and adsorption time on adsorption were also explored. Results showed that the maximum adsorption capacity of 30 mg g-1 was achieved when 0.25%w/v of aluminium hydroxide and 100 mg L-1 of brazilein solution were applied. The adsorption kinetics and adsorption isotherm fitted the pseudo second order model and Langmuir isotherm, respectively. Additionally, this lake pigment can be utilized as a natural colorant for natural rubber toy balloons, which could made toy balloon safer for children than synthetic dye. Thus, our lake pigment can be an alternative choice of safe and environmental friendly colorant for products including toys.

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Aluminium and calcium lake pigments of Lac natural dye

Cited by 6 publications

References 15 publications

Historically Inspired Strategy to Achieve Sustainable and Effective Coloration of Bioplastics

Historically Inspired Strategy to Achieve Sustainable and Effective Coloration of Bioplastics

UV-Vis spectroscopic investigation on color change kinetics of lac dye as influenced by some food spoilage metabolites: validation for milk quality monitoring

Eco-friendly lake pigment from sappanwood: Adsorption study and its application as natural colorant for natural rubber toy balloon

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