M. A. Rahman Bhuiyan

Chitin and Chitosan: Structure, Properties and Applications in Biomedical Engineering

Chitin and its deacetylated derivative chitosan are natural polymers composed of randomly distributed β-(1-4)-linked d-glucosamine (deacetylated unit) and N-acetyl-d-glucosamine (acetylated unit). Biopolymers like chitin and chitosan exhibit diverse properties that open up a wide-ranging of applications in various sectors especially in biomedical science. The latest advances in the biomedical research are important emerging trends that hold a great promise in wound-healing management products. Chitin and chitosan are considered as useful biocompatible materials to be used in a medical device to treat, augment or replace any tissue, organ, or function of the body. A body of recent studies suggests that chitosan and its derivatives are promising candidates for supporting materials in tissue engineering applications. This review article is mainly focused on the contemporary research on chitin and chitosan towards their applications in numerous biomedical fields namely tissue engineering, artificial kidney, skin, bone, cartilage, liver, nerve, tendon, wound-healing, burn treatment and some other useful purposes.

Investigation on Dyeing Performance of Basic and Reactive Dyes Concerning Jute Fiber Dyeing

ABSTRACT This paper includes the investigation on the dyeing performance of reactive and basic dyestuff regarding jute fiber and discusses their benefits and shortcomings. Plain woven jute fabric samples of 261 GSM were dyed with 0.5%, 1.0%, and 4.0% shade of basic and reactive dyes. Then the dyeing performance of both dyestuffs was analyzed. It has been found that exhaustion of basic dye is considerably greater than reactive dye, while this exhaustion decreases for basic dye and increases for reactive dye with the increment of respective shade percentages. This phenomenon has also been verified through the absorption curve, i.e. K/S value of fabric dyed with both dyestuffs in three different shade percentages. Again strong covalent bond is formed during the fixation of reactive dye with the cellulose of jute fiber, and at the same time no strong bond was created in case of basic dye. Finally the color fastness properties have been assessed through rubbing and washing. Both the dye classes have shown nearly similar ratings in case of dry rubbing. However, in case of wet rubbing and wash fastness to color change and color staining; the samples dyed with reactive dyes showed superior fastness ratings over the basic dyed samples.

Decolorization of textile wastewater by gamma irradiation and its reuse in dyeing process

AbstractThis paper describes the scope of employing high-energy gamma irradiation for textile wastewater treatment and the possibility of using the treated wastewater in the dyeing of knitted cotton fabric. The treatment was carried out in Cobalt-60 gamma radiation source at different irradiation doses (3, 5, 8, and 12 kGy). Then, the irradiated wastewater was used for dyeing of cotton fabric with reactive dye. The performance of the fabric dyed with treated wastewater was compared to that of the fabric dyed with freshwater. Hence, the dyeing performance was evaluated by comparing the depth of shades of both types of dyed fabrics from the analysis of absorption spectrum (K/S value vs. wavelength). The absorption curves of irradiated wastewater dyed fabric in light, medium, and dark shade of three different colors have shown close match to their corresponding freshwater dyed fabric. Variation of shade between the dyed fabrics, representing by ∆E values, were also found within the maximum acceptable limit a...

Coloration of polyester fiber with natural dye henna (Lawsonia inermis L.) without using mordant: a new approach towards a cleaner production

The demand of natural colorants for the dyeing of textile fibers has been increasing gradually in recent years due to a growing global ecological awareness as well as a greater emphasis on a cleaner and greener production process. The eco-friendly dyeing of polyester fiber with natural dye henna is a novel approach that has extensively been studied in this article. To this end, the dyeing of polyester fiber with henna dye was conducted at different temperatures without using hazardous metallic mordants. Then the dyeing performance was investigated in terms of depth of shade measurement, analysis of colorimetric properties of color and assessment of color fastness properties of henna dyed polyester fabric samples. The amount of dye absorption by fiber and the resulting depth of shade were found to increase with increasing dyeing temperature. In case of colorfastness properties, all dyed substrates demonstrated excellent fastness ratings against washing, rubbing and perspiration with little to no deterioration of color. Moreover, the detailed morphological study revealed that surface structure of fiber remained unchanged after dyeing at an elevated temperature and pressure. So, the findings suggest that dyeing of polyester fiber with henna dye without any metallic mordants is a promising approach to get the desired dyeing performance alongside opening up an avenue for eco-friendly dyeing.