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Colorants, Volume 4, Issue 3 (September 2025) – 3 articles

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12 pages, 6938 KiB  
Article
Development of Water-Based Inks with Bio-Based Pigments for Digital Textile Printing Using Valve-Jet Printhead Technology
by Jéssica Antunes, Marisa Lopes, Beatriz Marques, Augusta Silva, Helena Vilaça and Carla J. Silva
Colorants 2025, 4(3), 24; https://doi.org/10.3390/colorants4030024 - 24 Jul 2025
Viewed by 207
Abstract
The textile industry is progressively shifting towards more sustainable solutions, particularly in the field of printing technologies. This study reports the development and evaluation of water-based pigment inks formulated with bio-based pigments derived from intermediates produced via bacterial fermentation. Two pigments—indigo (blue) and [...] Read more.
The textile industry is progressively shifting towards more sustainable solutions, particularly in the field of printing technologies. This study reports the development and evaluation of water-based pigment inks formulated with bio-based pigments derived from intermediates produced via bacterial fermentation. Two pigments—indigo (blue) and quinacridone (red)—were incorporated into ink formulations and applied on cotton and polyester fabrics through valve-jet inkjet printing (ChromoJet). The physical properties of the inks were analyzed to ensure compatibility with the equipment, and printed fabrics were assessed as to their color fastness to washing, rubbing, artificial weathering, and artificial light. The results highlight the good performance of the bio-based inks, with excellent light and weathering fastness and satisfactory wash and rub resistance. The effect of different pre-treatments, including a biopolymer and a synthetic binder, was also investigated. Notably, the biopolymer pre-treatment enhanced pigment fixation on cotton, while the synthetic binder improved wash fastness on polyester. These findings support the integration of biotechnologically sourced pigments into eco-friendly textile digital printing workflows. Full article
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17 pages, 2950 KiB  
Article
Obtention of ZnO-Based Hybrid Pigments: Exploring Textile Dye Adsorption and Co-Adsorption with Copper Ion
by Taiane L. Dlugoviet, Andressa dos Santos, Julia de Oliveira Primo and Fauze Jacó Anaissi
Colorants 2025, 4(3), 23; https://doi.org/10.3390/colorants4030023 - 14 Jul 2025
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Abstract
Annually, more than 10,000 synthetic dyes are produced worldwide, generating around 280,000 tons of waste, posing risks to human and aquatic life, and potentially creating even more toxic products than the dyes themselves. This study aims to immobilize organic dyes, forming hybrid pigments [...] Read more.
Annually, more than 10,000 synthetic dyes are produced worldwide, generating around 280,000 tons of waste, posing risks to human and aquatic life, and potentially creating even more toxic products than the dyes themselves. This study aims to immobilize organic dyes, forming hybrid pigments using ZnO as support obtained through starch combustion. ZnO was obtained by starch (sago) combustion and characterized by XRD, SEM and the BET method. It was then used for the adsorption of orange and green textile dyes, evaluating the adsorbent dosage, initial dye concentration, contact time, and selectivity with copper ions. The removal studies indicated up to 100% removal of both dyes at low concentrations. The co-adsorption system showed excellent performance, with removal percentages exceeding 90% for both textile dyes and Cu (II) ions. Hybrid pigments were assessed for solvent resistance and durability under extended white light exposure. ZnO immobilized the dyes, showing resistance to organic solvents and good stability under prolonged white light exposure. Full article
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35 pages, 5960 KiB  
Review
The Role of Perylene Diimide Dyes as Cellular Imaging Agents and for Enhancing Phototherapy Outcomes
by Panangattukara Prabhakaran Praveen Kumar
Colorants 2025, 4(3), 22; https://doi.org/10.3390/colorants4030022 - 1 Jul 2025
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Abstract
Recent advancements in phototherapy have underscored the need for effective cellular imaging agents that can enhance therapeutic efficacy and precision. Perylene diimide (PDI) dyes, known for their unique optical properties and biocompatibility, have emerged as promising candidates in this domain. This review paper [...] Read more.
Recent advancements in phototherapy have underscored the need for effective cellular imaging agents that can enhance therapeutic efficacy and precision. Perylene diimide (PDI) dyes, known for their unique optical properties and biocompatibility, have emerged as promising candidates in this domain. This review paper provides a comprehensive analysis of the potential applications of PDI dyes in cellular imaging, specifically within the context of phototherapies. We explore the synthesis of these dyes, their photophysical characteristics, and mechanisms of cellular uptake. Moreover, this review highlights recent studies that demonstrate the effectiveness of PDI dyes in the real-time imaging of cellular processes and their synergistic effects in photodynamic therapy (PDT) and photothermal therapy (PTT). By evaluating various experimental approaches and their outcomes, we aim to elucidate the advantages of employing PDI dyes in clinical settings. The findings of this review suggest that perylene diimide dyes are not only capable of enhancing imaging contrast but also optimizing the therapeutic response in targeted phototherapy applications. Ultimately, this paper advocates for further research into the integration of PDI dyes in clinical practice, emphasizing their potential to significantly improve patient outcomes in cancer and other diseases requiring photoactive treatment modalities. Full article
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