Colorimetric Analysis of the Stability of Annatto Dye in Solution and Its Use in the Dyeing of Polyester Fibers

Effect of different filters on the extraction of norbixin from Bixa orellana for synthetic fiber dyeing and development of a post-dyeing process for removal of the unfixed dye

“…The procedure performed consists of purging at 80 °C for 30 min, followed by neutralization with acetic acid (0.2 g L -1 ) and two more washes at room temperature, as schematically shown in Figure 1. During the purging, 1.5 g L -1 of non-ionic detergent and 2 g L -1 of sodium carbonate were added, as proposed in the literature with modifications to adhere to the procedure currently used by the textile plants in the region Bueno et al (2020). Dyeing was performed on the purged fabrics, using 5 g samples of fabric, a bath ratio (mass of fabric per volume of bath = gfabric/mLbath) of 1:10 and dye concentration of 1.5 % (m/m).…”

“…Dyeing was performed on the purged fabrics, using 5 g samples of fabric, a bath ratio (mass of fabric per volume of bath = gfabric/mLbath) of 1:10 and dye concentration of 1.5 % (m/m). The pH was maintained at 4.5 and the temperature at 130 °C for 45 min, followed by rinsing for 10 min with only water at 80 ℃ (Bueno et al, 2020). After dyeing the samples were dried and subsequently the quality of the dye fixation was evaluated by the fastness test.…”

“…The reading of the blank samples was required due to the instability of the annatto dye under conditions of high temperature and low pH (Bueno et al, 2020).…”

“…According to Mercadante et al (1997), the concentration of the dye generally found in the coating of B. orellana seeds is 4.5 % by mass and is comprised of carotenoids, consisting of 70 to 80% bixin and norbixin (Preston and Rickard, 1980;Singh and Bharati, 2014). The main motivation for studies on these dyes is their high biodegradability, low toxicity, high availability, and potential antioxidant and antimicrobial properties, but their stability in textile substrates needs to be optimized (Bueno et al, 2020;Nathan et al, 2019;Shahid-Ul-Islam et al, 2016).…”

Estudo Da Viabilidade Do Tingimento Da Poliamida Com Corante Natural De Urucum

“…O interesse pelo uso de corantes naturais tem crescido nos últimos anos, uma vez que apresentam melhor biodegradabilidade e são produzidos por processos menos agressivos(KAMEL et al, 2009). mitigar os impactos mediante alternativas que sejam, além de benéficas à natureza, também técnica e comercialmente viáveis(LUCARINI et al, 2017;DIAS, 2010;BUENO et al, 2020). Diante deste cenário, torna-se importante o estudo e a busca por técnicas que possibilitem obter, utilizando matérias-primas naturais, um tingimento uniforme, sólido e estável, que possa ser empregado a nível industrial.…”