Pyranoflavylium derivatives, namely cyanidin-3-glucoside, malvidin 3-O-glucoside, malvidin 3-O-coumaroylglucoside, cyanidin 3-glucoside-pyruvic acid adduct and malvidin 3-glucoside-pyruvic acid ...adduct, extracted from red grapes were used as sensitizers in dye-sensitized solar cells (DSSCs). With these natural dyes, cell's efficiencies ranged up to 0.08%. The cyanidin based dyes were more efficient as sensitizers than the malvidin molecules and the presence of the pyruvic acid adduct decreased efficiency. Furthermore, the use of drops of Port wine in the production of DSSCs resulted in an efficiency of 0.025%. Although the obtained efficiencies still need improvements for an industrial application, it is given further evidence that wine dyes can harvest and convert sunlight into electricity through a process that mimics natural photosynthesis.
In this study, certain properties of
Hibiscus sabdariffa
flower extracts for the dyeing of cotton fabrics and wool yarns were investigated. For this purpose, the cotton fabrics and wool yarns were ...processed with pre–, meta– and post–mordanting methods in the presence of FeSO
4
, CuSO
4
and AlK(SO
4
)
2
mordants. After dyeing, color analyses of the dyed samples were done and the results were evaluated in terms of wash, rubbing and light fastness values. The color codes were determined with Pantone Color Quide, and K/S and
L
*
a
*
b
* values were detected with color measurement spectrophotometer. The highest K/S value was measured as 9.55 for AlK(SO
4
)
2
with post–mordanting method for dyed cotton fabrics. While generally blue, burgundy, green and lilac color tones were obtained in cotton fabrics, burgundy, red brown and green color tones were obtained in wool yarns. As a result, it was determined that cotton fabrics exhibited better dyeing potential compared to wool yarns, and the highest color strength values were obtained using the post–mordanting method. When the fastness tests for both cotton fabrics and wool yarns were compared, the order of AlK(SO
4
)
2
> CuSO
4
> FeSO
4
in terms of fastness was obtained in all three mordanting methods.
In the present work, a method is proposed that combines spectrofluorimetry with multivariate analysis (cluster and principal components) to non-invasively investigate natural dyes used, mainly in the ...form of lakes, in illuminations. First, a consistent number of mock-up samples of red and purple lakes (from brazilwood, madder, kermes, cochineal, lac dye, folium and orcein) were prepared following the recipes reported in ancient treatises, then the experimental conditions for their non-invasive investigation were optimized by benchtop instrumentation and transferred to a portable microprobe suitable for in situ analyses. For all the coloring materials examined, it was thus possible to obtain a satisfactory grouping of samples containing the same dye. The analytical protocol was finally extended to the characterization of dyes in the Crescenzago choir books, illuminated manuscripts dating back to the end of the 15th century.
Indigo carmine can be used as a source of blue dye for wool and hair dyeing. The option to use indigo carmine in combination with other natural dyes in a one-bath procedure as a hybrid dyeing concept ...is of interest both for natural dyeing and for coloration of hair. The present study shows that indigo carmine dyeing on wool exhibits the substantial sorption in the range of pH 4–5 and temperature between 40 and 60
°C. Experiments with human hair samples indicate that the experiments on wool can serve as a model that can be applied for hair dyeing. Comparisons of the energy, water and chemical consumption between two-bath dyeing with indigo and natural dyes separately and a one-bath dyeing using indigo carmine together with other natural dyes demonstrates the advantages of the one-bath hybrid dyeing concept.
Abstrak Penelitian bertujuan menentukan konsentrasi fiksator jenis bahan fiksasi yang berbeda terhadap hasil kualitas kain mori primissima pewarna alami daun sirsak. Penelitian menggunakan Rancangan ...Acak Tersarang dua faktor. Faktor utamanya adalah jenis bahan fiksasi kapur tohor dan tawas, sedangkan faktor yang tersarang adalah konsentrasi bahan fiksasi 10%, 15%, dan 20%. Dilakukan uji organoleptik (warna dan tingkat kehalusan) dan uji fisik (intensitas warna, uji ketahanan luntur warna). Data uji organoleptik menggunakan uji Friedman, data intensitas warna dengan ANOVA dilanjutkan dengan uji BNT (Beda Nyata Terkecil) dengan kepercayaan (α=0,05) jika terdapat beda tidak nyata, dan data ketahanan luntur warna dianalisis secara deskriptif. Hasil penelitian menunjukkan perlakuan terbaik fiksator tawas pada konsentrasi 10% diperoleh nilai warna 3,93 (menyukai), tingkat kehalusan 3,83 (menyukai), nilai intensitas warna merah 14,47, nilai intensitas warna kuning 14,03, nilai kecerahan 55,4, gosokan kering dan gosokan basah 4 (baik), perubahan warna 3 (cukup baik), dan skala penodaan 4 (baik). Perlakuan terbaik fiksator kapur tohor pada konsentrasi 20% diperoleh nilai warna 3,97 (menyukai), tingkat kehalusan 4 (menyukai), nilai intensitas warna merah 18,8, nilai intensitas warna kuning 18,87, nilai kecerahan 51,1, gosokan kering 3 (cukup baik), dan gosokan basah 2 (agak baik), perubahan warna 2 (agak baik), skala penodaan 3-4 (cukup baik). Kata kunci: Daun sirsak, fiksasi, pewarna alami Abstract This research aims to determine concentration of fixator from different material fixation types to quality primissima results soursop leaves natural dyes. Research using Random Design Nested by two factors. The first factor is type of material fixation unlike lime and alum, the nested factor is concentration of fixation 10%, 15% and 20%. The parameters to test is organoleptics test (color and smoothness) and physic test (color intensity and color fastness test). Organoleptics data results using Friedman test, intensity data with ANOVA and if there is no real difference continue with BNT (the smallest Real Difference) trust (α = 0.05), fastness color data with analyzed descriptively. The analysis showed best concentration of alum is 10% obtained value on color 3.93, smoothness 3.83, redness value 14.47, yellowness value 14.03, brightness value 55.4, dry rub and rub 4, color change 3 and scale desecration 4. The best concentration in unlike lime is 20% obtained value on color 3.97, smoothness 4, redness value 18.8, yellowness value 18.87, brightness value 51.1, dry rub 3, wet rub 2, color change 2 and scale desecration 3-4. Keywords: Fixation, natural dyes, soursop leaf
Yarn samples from the Saltzman Collection of Peruvian dyes were characterized by several different analytical techniques: high performance liquid chromatography with both diode array detection ...(HPLC-DAD) and electrospray ionisation with tandem mass spectrometry (HPLC-ESI-Q-ToF), direct analysis in real time (DART) mass spectrometry and paper spray mass spectrometry. This report serves primarily as a database of chemical information about the colorants in these dye materials for those studying ancient South American textiles and their colorants. We also provide a comparison of the results obtained by currently widespread HPLC techniques with those of two different ambient ionisation direct mass spectrometry methods to highlight the advantages and disadvantages of these approaches.
•F. solani PSC-R exhibits antibacterial, anti-oxidant and dyeing potential.•Sucrose, acidic pH and incubation at 31°C increased the yield of metabolites.•Optimized medium enhanced the naphthoquinones ...and phenolics by 3.6 and 1.5-fold.
The present study was attempted to enhance the production of naphthoquinones and phenolics by Fusarium solani PSC-R of Palk Bay origin, which exhibited potent antibacterial, antioxidant and dyeing activity. Maximum productivity of naphthoquinones and phenolics was achieved in potato infusion medium supplemented with 2% sucrose. Addition of nitrogen sources to the medium adversely affected the production of both naphthoquinones and phenolics. An initial pH of 5 and incubation at 31°C for six days at 140rpm was found to increase the yield (123.65mg/g of DW), concentration (867.33mg/l) and total naphthoquinones (602.8μM/g DW) by 7.58, 10.44 and 3.68-fold respectively. Similarly, the antioxidant and antibacterial activity associated with the phenolics of PSC-R increased by 1.5-fold in the optimized medium. The obtained results document the effective means of enhanced production of naphthoquinones and phenolics in the suspension culture of F. solani PSC-R at bioreactor level.
The efficiency of eight different procedures used for the extraction of natural dyes was evaluated using contemporary wool samples dyed with cochineal, madder, woad, weld, brazilwood and logwood. ...Comparison was made based on the LC-DAD peak areas of the natural dye’s main components which had been extracted from the wool samples. Among the tested methods, an extraction procedure with Na
2
EDTA in water/DMF (1:1,
v/v
) proved to be the most suitable for the extraction of the studied dyes, which presented a wide range of chemical structures. The identification of the natural dyes used in the making of an eighteenth century Arraiolos carpet was possible using the Na
2
EDTA/DMF extraction of the wool embroidery samples and an LC-DAD-MS methodology. The effectiveness of the Na
2
EDTA/DMF extraction method was particularly observed in the extraction of weld dye components. Nine flavone derivatives previously identified in weld extracts could be identified in a single historical sample, confirming the use of this natural dye in the making of Arraiolos carpets. Indigo and brazilwood were also identified in the samples, and despite the fact that these natural dyes were referred in the historical recipes of Arraiolos dyeing, it is the first time that the use of brazilwood is confirmed. Mordant analysis by ICP-MS identified the widespread use of alum in the dyeing process, but in some samples with darker hues, high amounts of iron were found instead.
Natural dyes extracted from
Eleiodoxa conferta
and
Garcinia atroviridis
were used for the first time as photosensitizers in dye-sensitized solar cells (DSSCs). Anthocyanin was identified as the main ...pigments that sensitize the semiconductor of TiO
2
film. Anthocyanin pigment contains hydroxyl and carboxylic groups in the molecule that can attach effectively to the surface of TiO
2
film. The optical characteristics of the extracted dye and photovoltaic performance of the cells were studied. The extracts showed UV–vis absorptions in the range of 530–560 nm with broad maxima absorption at ~ 430 nm. FTIR spectra of extraction revealed the presence of anchoring groups. For
E. conferta
, the photovoltaic performance of the sample with 3.16-μm-thick TiO
2
produced the best results with open-circuit voltage (V
OC
), short-circuit current density (J
SC
), fill factor (FF), and energy conversion efficiency (
ɳ
) values of 0.37 V, 6.56 mA/cm
2
, 0.49, and 1.18%, respectively. The best photovoltaic performance for
G. atroviridis
was also obtained from the sample with 3.16-μm-thick TiO
2
with V
OC
, J
SC
, FF, and
ɳ
values of 0.35 V, 3.74 mA/cm
2
, 0.65, and 0.85%, respectively.
The present study has been focused on the extraction of natural dyes from
Syzygium cumini (L.)
Jambolan fruit dry seed endosperm and investigation of their phytochemicals and pharmacological ...characteristics. Dyes were prepared using aqueous, acidic, alcoholic and alkaline extraction techniques. UV spectral studies of the dyes showed a variation in absorption maxima and their color varied with respect to the pH and the solvent used during extraction. The dye was prepared from
Jambolan
fruit dry seed endosperm showed good antibacterial activity. The aqueous extraction of
Jambolan
fruit dry seed endosperm was able to inhibit the growth of many bacterial strains viz
S. lutea, E.coli, P. aeruginosa, Pseudomonas fluorescens
and
S. aureus
etc. The antimicrobial property of the dyes was used in developing antimicrobial fabric.
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