Dyestuffs extracted from naturally originated materials are getting popularity in terms of environment-friendly biobased perspective and awareness. The natural colors were imparted into the wool ...fabric surface after extraction from sappan wood plants through applying exhaustion dyeing methods. Besides, three mordants (aluminum potassium sulfate (AlK(SO
4
)
2
, copper sulfate (CuSO
4
), and zinc sulfates (ZnSO
4
·) were used as mordanting materials for better fixation of extracted dyes on wool fabrics. The colored wool fabrics exhibited better color performances especially at optimum conditions (temperature 80°C, time 60 min, and pH 4.0) in terms of CIE lab values (CIE L* a* b*) and color strength (K/S). Moderate colorfastness results were also achieved without any color fading on wool surfaces. The morphological analysis showed that dyed fabrics surfaces are more uniform than undyed fabric. The FTIR (Fourier transform infrared spectroscopy) spectra confirmed the presence of higher absorptions onto dyed fabric, resulting in a better thermal stability property for dyed fabric. Besides, UV protection of the dyed fabric exhibited a higher UPF value than undyed fabric, which denotes that our utilized dye could enhance the functional property of the wool fabric. Satisfactory mechanical properties also further confirmed the successful application potentiality of greenly synthesized natural colorants on wool fabric.
In this research, alkaloid compounds were extracted from the roots and stems of
Berberis vulgaris
using response surface methodology. The experimental design used absorption intensity as the response ...at three levels and four factors. The results showed that the factors of mesh and solvent percentage had more meaningful effects than those of temperature and time. Extractions were performed in an incubator shaker with 90% methanol solvent as optimal. The absorption intensity for the roots and stems of the plant was 1.299 and 0.867, respectively. The extracted dye was used in the fabrication of dye-sensitized solar cells. The surface morphology of the samples was studied using atomic force microscopy. Under optimal conditions, low aggregation between the dye molecules and TiO
2
film decreased the average surface roughness in comparison with the condition in which the dye molecule concentration increased. The solar cell was built using optical electrodes sensitized with the roots and stems of
B. vulgaris
, and the calculated solar cell output under optimal conditions was 0.304 and 0.309, respectively. Electrochemical impedance spectroscopy was used to study the internal resistance of the solar cells, and it was shown that an increase in electron transfer between the dye molecule surface and TiO
2
film decreased solar cell resistance.
•ORAC and UV–Vis spectra can be used for conversion efficiency indicator of DSSCs.•Natural dyes were extracted by simple methods without further modifications.•No special treatment was made on ...working electrode or any other parts of the DSSCs.
Red–purple natural sensitizers are prepared from anthocyanins and betalains rich section of plants which are extracted by simple methods without further modifications such as commercial juice (Welch grape juice) and juices obtained by fresh squeezing or hot water extraction. No special treatments on the surface of TiO2 electrode has been made to enhance the adhesion between natural dye and TiO2. An outstandingly high power conversion efficiency (η) of DSSCs are obtained from purple yam (2.05%), pomegranate (1.35%) and Welch grape juice (0.82%). ORAC (Oxygen Radical Absorbing Capacity) and VIS spectroscopy data can be used as a guideline for the conversion efficiency indicator of DSSCs using anthocyanins (without tannins) dyes. On the contrary, only ORAC can be used as a guideline for the conversion efficiency indicator of DSSCs in the case of anthocyanins (with tannins) dyes.
Flowers have played a significant role in society, focusing on their aesthetic value rather than their food potential. This study’s goal was to look into flowering plants for everything from health ...benefits to other possible applications. This review presents detailed information on 119 species of flowers with agri-food and health relevance. Data were collected on their family, species, common name, commonly used plant part, bioremediation applications, main chemical compounds, medicinal and gastronomic uses, and concentration of bioactive compounds such as carotenoids and phenolic compounds. In this respect, 87% of the floral species studied contain some toxic compounds, sometimes making them inedible, but specific molecules from these species have been used in medicine. Seventy-six percent can be consumed in low doses by infusion. In addition, 97% of the species studied are reported to have medicinal uses (32% immune system), and 63% could be used in the bioremediation of contaminated environments. Significantly, more than 50% of the species were only analysed for total concentrations of carotenoids and phenolic compounds, indicating a significant gap in identifying specific molecules of these bioactive compounds. These potential sources of bioactive compounds could transform the health and nutraceutical industries, offering innovative approaches to combat oxidative stress and promote optimal well-being.
Currently, the known possible shades obtained for coloring silk fabrics using enzyme catalysts such as peroxidase are limited to a few shades of brownish tint. For the oxidative dyeing method using ...horseradish peroxidase (HRP) to become common, it must be able to produce a more diverse range of colors; this is a problem that must be solved. The purpose of this study is to obtain various colors by dyeing natural phenolic substrates using HRP in various buffers (acetate, citrate, phosphate buffer) and various pH levels (3 ~ 9). We emphasized color diversity, which was achieved through the exploration of six different natural aromatic compounds: gallic acid (GA), guaiacol (GAC), p-coumalic acid (CA), ferulic acid (FA), catechol (CAC) and caffeic acid (CFA). We also performed a methodological survey of reaction processing parameters. The colored products generated through HRP catalysis were analyzed using UV-vis. The color of the dyed fabrics was analyzed using the CIE L*a*b* color space system. As a result of the experiment, we obtained silk fabrics with various color depths from each buffer system. This suggests that the desired color and tone of dyed silk fabrics can be achieved by adjusting the buffer system and pH value.
Purpose
The purpose of this study is to investigate the possibility of dyeing polyester (PET) fabric with natural dye extracted from annatto seeds using high temperature dyeing method.
...Design/methodology/approach
PET fabric was dyed with annatto extract by varying dyeing parameters (temperature, time, pH and dye concentration) to determine the optimum dyeing conditions. The influences of KAl(SO4)2, FeSO4, gallnut mordants or a commercial UV absorber on colour yield and fastness properties were further studied.
Findings
Optimum results were obtained when the fabric was dyed at 130°C for 30 min in a dyebath containing 15 per cent (owf) annatto dye at pH 6. The dyed fabric had an orange shade and exhibited good to excellent wash, crock, perspiration fastness and fair light fastness. Further dyeing with mordants or UV absorber mostly resulted in lower colour yield and similar fastness properties.
Research limitations/implications
Although the light fastness was slightly improved to moderate level for the sample with UV absorber, a noticeable colour staining on cotton portion of multi-fibre fabric occurred when subjected to standard washing test. Compared to C.I. Disperse Orange 73, the annatto dye exhibited comparable colour fastness but had inferior light fastness when dyed at approximately the same colour strength.
Originality/value
Natural colourants from annatto seeds can be used to dye PET fabric at high temperature without mordants, yielding deep orange shade and satisfactory fastness properties. This study provides a promising application to reduce the environmental impact of synthetic dyes.
The Brazilian Legal Amazon region is divided into at least 155 ethnic groups and has the largest concentration of Indigenous people globally. It represents one of the most extraordinary levels of ...human, cultural, and artistic diversity, but its material culture is one of the least well-studied. This is especially true in technical art history and conservation science, largely due to (1) the limited international awareness of the richness of materials and techniques used by these Indigenous people and (2) the limitations of knowledge access for many scientists to literature usually published in Portuguese within social sciences and humanities. One result is that these arts are marginalized within technical art history, conservation, and conservation science. To address this knowledge gap, the authors explore 70 materials—among them pigments, dyes, binding media, and varnishes—used for paint production and coloring processes, including syntheses. The authors facilitate research possibilities within technical art history, conservation, and conservation science by presenting data from historical texts from the 18th and 19th centuries and more recent scientific literature. The work aims to build a more global, inclusive, and decentralized vision of art history and to create a more pluralistic narrative of Indigenous art history from South America.
This study focuses on the characterization of pigment compounds presence in Sargassum sp. extracts. The ground powder of dry Sargassum sp. was macerated in in methanol solution at 60°C for 48 hours ...in an aluminium foil-wrapped conical flask (to provide the dark environment). The extracted colourant was measured with UV-vis Spectrophotometer and Q-TOF LCMS to determine the compounds presence. The extracted colourant also used to dye pretreated and untreated polyester fabric with poly(amidoamine) dendrimer at different concentrations with and without mordants. The exhaustion dyeing with the simultaneous mordanting procedure was carried at 85°C for 60 minutes. The colorimetric properties of the dyed fabrics were then analysed. The results showed that the pigment compounds presence in Sargassum sp. extracts is fucoxanthin and chlorophyll. The application of dendrimer improved K/S values of the dyed fabric. Thus, Sargassum sp. extract is suitable to be used as natural dyes for textile dyeing.
In the present study, dye-sensitized solar cells (DSSCs) were fabricated by sensitizing TiO2 P25-based electrodes using a series of natural dye extracted from plant sources of Reseda luteola, ...Berberis integerrima, Panica granatum Pleniflora, Consolida orientalis, Reseda gredensis, Clemetis orientalis, Adonis flammea, Salvia sclarea, and Consolida ajacis. The optical properties of the natural dye extracts were investigated by UV–vis spectroscopy. The crystalline structure and morphological characteristic of TiO2 electrode were analyzed by XRD and SEM, respectively. Our findings showed that due to Delphinidin is the main pigment of C. ajacis and interaction between the hydroxyl groups of the Delphinidin and the TiO2 surface is very efficient, this sensitizer owns the best photovoltaic performance among the all natural dyes. Photoelectrochemical performance of the natural dyes based-DSSCs illustrated short-circuit photocurrent (Jsc) and open-circuit voltages (Voc) ranging from 0.004 to 0.68mA and 0.37 to 0.64, respectively.
Terminalia chebula, Rubia tinctorum and Biancaea sappan are used here as sensitizers on TiO2 hollow-sphere. Anatase-rutile TiO2 hollow-spheres were synthesized using carbon spheres template assisted ...method. Structural, shape and purity of the prepared TiO2 hollow-spheres are confirmed through XRD, SEM measurements. Absorbance spectra are used to analyze the spectral response of the sensitizers. From the J-V measurements, it is found that Terminalia chebula shows a better performance of open circuit voltage (VOC) ∼ 0.47 V, short circuit current (JSC) ∼ 0.11 mA/cm2 and fill factor 40% compared to all others. The charge transfer resistance and life-time are investigated through Nyquist and Bode plots.
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