Eco-friendly Natural Dyes Research Articles

NATURAL DYES EXTRACTED FROM WASTE LEAVES OF TERMINALIA CATAPPA LOCALLY KNOWN AS TROPICAL ALMOND AND ITS APPLICATION ON SILK FABRICS PRETREATED WITH ECO FRIENDLY AND NONECO-FRIENDLY MORDANTS

The use of non-toxic and eco-friendly natural dyes on textiles has become a matter of significant importance because of the increased environmental awareness in order to avoid some synthetic dyes. Synthetic dyes are hazardous and carcinogenic and also release vast amount of pollutant in the environment during their manufacture and application, thus revival of natural dyeing techniques as one of the alternative is being emphasized for this purpose. Most effective ways for reducing environmental pollution is the replacement of polluting materials and chemicals by eco-friendly natural materials. Many natural resources which are being wasted indiscriminately or thrown away as a waste product contain useful dyes and pigments. In the present study, natural dye extracted from the waste leaves of Terminalia Catappa (tropical almond) and its application on silk fabrics pretreated with eco-friendly and non-eco-friendly mordants have been carried out successfully. Different shades with excellent to good fastness properties have been obtained.

Eco-friendly natural dye from bark of Acacia leucophloea for dyeing of cotton fabric using different temperature and mordant

The colour fastness properties of the colourant extracted from the brake of acacia leucophoea on cotton have studied using different temperate (50°C, 60°C and 70°C) and different hours washing fastness (6h, 7h, 8h)of various chemical mordants. So in present investigation, bleached cotton fabrics were dyed with different mordants. Dyeing was carried out by pre-mordanting, post mordanting and simultaneous mordanting. Fastness properties of the dyed sample, pre mordanting methods good results. The colour fastness properties dyed fabrics washing, light, fastness, GCMS were studied.

소목, 치자, 쑥으로부터 추출된 천연염료의 색도분석

환경 친화적이고 질병을 유발시키지 않은 천연색소의 사용이 증가함에 따라 천연색소를 추출하는 다양한 방법이 연구되고 있다. 본 연구에서는 천연염료인 brazilein, crocin, chlorophyll을 포함하고 있는 식물성 원료인 소목, 치자, 쑥을 대상으로 천연염료를 추출하였다. 추출용매의 pH와 추출시간을 변수로 추출된 천연염료의 적색, 황색, 녹색계열의 목표색을 설정하고 추출된 천연염료의 명도와 색의 좌표(L, a, b)의 정량적 수치로부터 색도분석을 수행하였다. 소목의 적색소인 brazilein과 치자의 황색소인 crocin의 경우 목표색인 카드뮴 레드와 카드뮴 옐로에 근접한 색상을 추출할 수 있었다. 추출시간 20 min을 기준으로 brazilein의 경우 pH 12, crocin의 경우 pH 9에서 색차를 나타내는 <TEX>${\Delta}E^*$</TEX>가 각각 18.2와 18.4로 목표색과 유사한 색의 색소가 추출되었다. 그러나 쑥의 녹색색소인 chlorophyll의 경우 목표색인 크롬 그린과는 차이를 보였다. Extracting natural dyes have been widely studied since the needs of eco-friendly and non-toxic natural dyes increased. In this paper, the natural dyes were extracted from sappan wood, gardenia, and mugwort containing brazilein, crocin, and chlorophyll process. After the extraction with variables of pH of solvent and reaction time, the chromaticity of extracted natural dyes was analyzed using quantitative values from brightness and color coordinate (L, a, b) based on the target colors of red, yellow and green. For the case of brazilein and crocin, the cadmium red and cadmium yellow, respectively were extracted. In the case of sappan wood and gardenia, the red pigment under pH 12 (<TEX>${\Delta}$</TEX> = 18.2) and the yellow pigment at pH 9 (<TEX>${\Delta}$</TEX> = 18.4) were extracted respectively. However, the color of extracted chlorophyll from mugwort was different from the target chrome green.

Application of eco-friendly natural dye obtained from Spathodea campanulata on silk using combination of mordants

Purpose – The purpose of this paper is to extract the eco-friendly natural dye obtained from the flower of Spathodea campanulata and apply on silk fabric using combination of mordants. The fastness properties of the flower of Spathodea campanulata dyed silk fabric have been studied using different combination (1:3, 1:1 and 3:1) of various mordants, such as myrobolan: nickel sulphate, myrobolan: aluminium sulphate, myrobolan: potassium dichromate, myrobolan: ferrous sulphate and myrobolan: stannous chloride. The wash, rub, light and perspiration fastness of the dyed samples have been evaluated. Design/methodology/approach – For dyeing there are three methods are used. They are Pre mordanting, Simultaneous mordanting and Post mordanting methods. Dyed silk materials are tested by using wash fastness, rub fastness, light and perspiration fastness methods. Findings – It is found that Spathodea campanulata dye can be successfully used for the dyeing of silk to obtain a wide range colours by using various combinations of mordants. With regards to colour fastness, test samples exhibit excellent fastness to washing, rubbing, except for pre-mordanting using myrobolan: potassium dichromate combination; and good to excellent fastness to perspiration in both acidic and alkaline media. Originality/value – Availability of literature related to this work is not available. The study of combination of mordants of this natural dye on silk is a new research work and the large scale preparation is definitely very useful to the society.

Extraction and Application of Novel Eco-friendly Natural Dye Obtained from Leaves of Sanamicky on Silk Fabric

Extraction and Application of Novel Eco-friendly Natural Dye Obtained from Leaves of Sanamicky on Silk Fabric

Extraction of eco-friendly natural dyes from mango leaves and their application on silk fabric

The aim of the study was to evaluate the performance of dyes extracted from mango leaves in silk dyeing. Extraction medium was optimized by extracting dyes from fixed quantity of crushed leaves under pH values from 3 to 12. The maximum relative color strength of the extracted dye liquor was found to be at pH 10. The optimum dye extraction conditions i.e., the temperature, time, and material-to-liquor ratio were found to be 98 °C, 60 min, and 1:10, respectively. Dyeing was carried out with the optimized dye extract on mordanted and unmordanted silk fabrics. The dyed materials were evaluated by measuring the color yield and fastness properties. It was concluded that the color values were found to be influenced by the addition of mordants, consequently different fashion hues were obtained from the same dye extract using different mordants. It can also be said that mango leaves have good potentiality for dyeing of silk fabric.

Dyeing of Wool Fabrics with Extracted Eco-Friendly Natural Dyes from Rhus Parviflora (Tung) Using Chemical Mordants: Comparison of Fastness Properties and Colour Strength with Some Mordants

Soaked wool fabrics were dyed with natural dyes extracted from the leaves of Rhus parviflora. The colour fastness properties and colour strength of dyed wool fabrics were determined and compared. From the comparative study of fastness properties and colour strength of the dyed wool samples, Rhus parviflora in simultaneous mordanting method with 3% mordant combination gives better results as compared to the natural dye samples without mordants as blank.

Fastness properties of silk fabric with eco-friendly natural dyes obtained from Achras sapota and Cordia sebestena - A comparison

Fastness properties of silk fabric with eco-friendly natural dyes obtained from Achras sapota and Cordia sebestena - A comparison

ECO-FRIENDLY NATURAL DYE FOR COTTON AND SILK FABRICS

Eco-friendly natural dye extracted from Swietenia mahogany leaves, has been used as eco-friendly dye to cotton and silk fabrics. The dyeing was carried out with and without the use of mordants and the fastness properties of the fabrics were determined. Colour values in terms of K/S and L* a* b* C and h colour coordinates were examined. A wide range of shades were obtained by using various mordants and mordanting techniques. Dye was tested for some eco-parameters using atomic absorption spectrophotometry and GC/MS. The effluent disposed at the end of the processing was also tested in some cases. The test results were compared with set standards to determine the eco-friendliness of natural dye, show that their concentrations are much below the stipulated limits.

Histomorphologic characterization of human tissues stained with selected plant‐based dyes (1050.10)

Background: The use of eco‐friendly natural dyes has become a matter of significance due to increased environmental awareness. However, the scientific studies and systematic reports with natural dyes are insufficient. In this study, we have explored the histomorphological properties of several plant‐based dyes.Methodology: Paraffin‐embedded human tissue sections were stained with a variety of plant‐based dyes sourced from Nigeria to determine factors that produce the optimal staining efficiency in the dyes. The stained tissues were studied under bright‐field and also using a multi‐spectral imaging system to histomorphologically analyze the staining characteristics on the different tissues.Results: The staining characteristics and factors influencing staining efficiency of the different dyes on human tissues were determined. L. cyanescens stained the nuclei and cytoplasm with strong nuclear labeling in all the tissues. H. sabdariffa selectively and strongly labeled the nuclei in the tissues stained. The deep pink from H. sabdariffa and the blue from L. cyanescens gave good contrast, making a good combination for staining of tissues.Conclusion: Our study has shown L. cyanescens and H. sabdariffa as effective, cheap and readily available histological stains derived from our rich biota.

English

English

Achievement of Different Color Tones Using Natural Dye Via Burn-Out Printing Style

Four different blended fabrics which comprised polyester/viscose (50/50), wool/cotton (50/50), wool/cotton (30/70) and cotton/linen (50/50) were subject to burn-out printing style using different agents. The latter comprised different concentrations of aluminum sulphate, sodium mono hydrogen phosphate, aluminum potassium sulphate, sodium hydroxide, tartaric acid, oxalic acid and citric acid. The burn-out printed blends were subject to dyeing using an eco-friendly natural dye, namely madder. The results obtained were evaluated via measuring the percentage (%) loss in weight, the K/S of the colored samples as well as the overall color fastness properties. The results revealed that the loss in weight was dependent on (a) the nature of the blend components, (b) the nature of the burn-out reagent, and (c) the concentration of the used reagent. The dyed burn-out areas were found to have a higher or lesser K/S than that of the ground shade. Hence, different color tones could be obtained which reflect attractive and beauty features. The overall color fastness properties for the blended fabrics printed before and after the burn-out treatment were nearly identical.

Antibacterial properties and color fastness of silk fabric dyed with turmeric extract

The use of non-toxic and eco-friendly natural dyes on textiles has received much attention due to the increased environmental awareness in order to avoid some hazardous synthetic dyes. In the present study, an eco-friendly approach was developed to impart color and antibacterial properties to silk fabrics dyed with turmeric extract as a non-toxic natural colorant. The natural colorant was extracted from Curcuma Longa rhizome. Copper sulfate, ferrous sulfate and potassium aluminium sulfate were applied in a pre-metallization process as mordanting agents. Antibacterial properties of treated fabrics were evaluated against common pathogenic bacteria, Staphylococcus aureus (Gram-positive) and Escherichia coli (Gram-negative). The effects of dye concentration and mordant types on the obtained color hues, antibacterial efficiency and color fastness of the fabrics were investigated. The results indicated that mordanted and dyed fabrics possessed desirable antibacterial properties. Complete antibacterial activity of the treated fabrics was obtained with 3 %owf (on weight of the fabric) copper sulfate. It was also shown that increasing the dye concentration could lead to a more efficient antibacterial activity on the mordanted dyed fabrics. An optimum level of the antibacterial activity was observed in the sample treated with 30 %owf of turmeric. Furthermore, the results of CIE L*, a*, b* values, FTIR, washing, light and rubbing fastnesses of the dyed fabrics were reported. The mordanted dyed silk fabrics exhibited desirable color fastness properties. These studies proved a direct relationship between the degree of antibacterial activity of the fabrics treated with turmeric and the metals ion concentration.

Application of Eclipta Leaves, Achras Zapota Leaves and Nyctanthes Arbortristis Flowers on Organic Cotton Fabric with Bio Wash

To rescue from the harmful effects of those chemical wastes the research work was focused on eco friendly natural dyes. The best in eco-friendly fabrics, “Organic cotton” was selected for the study. Extracted natural dyes from the selected natural resource (Eclipta Leaves, Achras Zapota Leaves and Nyctanthes Arbortristis Flowers) were applied onto organic cotton yarn with no using of chemicals & mordents. Enzymatic Bio wash has been further done to the naturally dyed organic cotton fabric. The colorfastness properties of natural dyed organic cotton fabric were observed and concluded.

Dyeing of Silk Fabric with Eco-Friendly Natural Dyes Obtained from Spathodea campanulata and Cordia sebestena: A Comparison

Dyeing of Silk Fabric with Eco-Friendly Natural Dyes Obtained from Spathodea campanulata and Cordia sebestena: A Comparison

Staining Characteristics ofLonchocarpus cyanescensLeaf Extract on the Testis of Sprague-Dawley Rats

The use of nonallergic, nontoxic, and eco-friendly natural dyes has become a matter of significant importance due to increased environmental awareness on the need to avoid hazardous synthetic dyes. This study was to determine the staining properties of the dye extract of Lonchocarpus cyanescens on histomorphology of the testis. Freshly cut leaves of L. cyanescens obtained from Akpan Ifia Inan village in Ikono local government area of Akwa Ibom state (latitude 5° 10' 12″ N; longitude 7° 48' 0″ E) were put into a plastic jar and boiling water was poured to cover the leaves. It was covered and left for an hour. The liquid was strained and potassium hydroxide was added to the dye water mixture to reach a pH of 9. A whisk was used to mix air into the liquid, and the mixuture was then allowed to sit until the blue indigo had settled to the bottom of the container. The dye was diluted with 70% ethanol to a concentration of 0.1 g/mL and was used to stain sections of testes. Its potential for use as a counterstain was also investigated. The testes sections were stained in shades of blue. The dye overshadowed the colors of haematoxylin and eosin. Preliminary phytochemical screening of L. cyanescens revealed that it contains alkaloids, saponins, flavonoids, and tannins.

Eco-Friendly Natural Dyes: A Comparative Study with Direct Dyes

With an increasing awareness of environmental pollution and health hazards associated with synthesis, processing and use of synthetic dyes, there is a worldwide interest in natural dyes for textiles. This paper presents a comparative study of natural dyes and direct dyes in terms of eco-friendliness and their various colour-fastness properties. It also reveals that natural dyes can be used safely as they contain metals and formaldehyde within the Okotex limits and do not contain amines. The fastness properties of natural dyes are found to be satisfactory.

&lt;i&gt;Curcuma Longa:&lt;/i&gt; Staining Effect on Histomorphology of the Testis

Background: The use of non-allergic, non-toxic and eco-friendly natural dyes has become a matter of significant importance due to the increased environmental awareness in order to avoid some hazardous synthetic dyes. Method: The ethanolic extract of Curcuma longa was diluted using 1% acetic acid in 70% ethanol to a concentration of 0.2 g/ml. It was used to stain histological sections of the testes for 15 minutes. Curcuma longa was also used as a counter stain for Haematoxylin. Phytochemical constituents were investigated. Results: The Curcuma longa dye distinctly stained the seminiferous epithelium and interstitium yellow. Curcuma longa provided a good counter stain for Haematoxylin, taking up the acidic staining characteristics with Haematoxylin staining the basic staining characteristics. Phytochemical screening revealed the presence of saponins, alkaloids, tannins and flavonoids. Conclusion: Curcuma longa has good potential for use as a counter stain for Haematoxylin in the staining of tissues in lieu of Eosin.

Eco-friendly and protective natural dye from red prickly pear (Opuntia Lasiacantha Pfeiffer) plant

New natural dye extracted from red prickly pear was used for dyeing wool with different types of mordents. The effect of mordant concentration on the color strength was discussed; the results obtained indicated that the color strength decreases with the increase of mordant concentration. The effect of the dye bath pH, salt concentration, dyeing temperature and dyeing time was also studied. The color strength and the dye uptake have exhibited high values. Good fastness properties of the dyed fabric were achieved.Antimicrobial activity of wool fabric dyed with this dye was tested according to diffusion agent. Test organisms as Escherichia coli, Bacillus subitilus, Pseudomons aeruginosa and Staphylococcus aureus were used and the results indicated that the samples exhibited a high inhibition zone.According to the available literature, this is the first report concerning a natural dye for fabric from fruits of red prickly pear plants.

Optimization of Dyeing Performance of an Eco Friendly Natural Dye “Vervain Barks” applied to Silk Fabrics at Different pH Values

The present study is carried out to optimize the dyeing conditions for silk fabrics using a new natural dye, Vervain barks at different pH values in the absence of mordants. Also, experiments are implemented to investigate the effects of processing conditions on color difference, color scale, color strength and light fastness characteristics. The changes in the morphology of the silk fabric surface after dyeing are studied using a scanning electron microscope. The pH in the acidic range 1-5 is optimum for dyeing, showing very good fastness properties for silk dyed fabrics