ArticleACS omega2025
Extraction Process of Color Powder and Cotton Screen Printing with Natural Dyes from Longan Leaf Powder.
Article in ACS omega, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Authors and funding
6 authors.
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Abstract
Longan leaves, an abundant agricultural waste in Thailand, were utilized to produce natural powdered dye for sustainable screen printing on cotton fabric. The leaves were boiled (1 kg in 5 L water at 100 °C for 2 h), filtered, dried with maltodextrin (15 g/L), and ground to obtain a reddish-brown powder with a particle size of 15.381 μm and a yield of 20.53%. The dye was mixed with starch paste at 70:30, 80:20, and 90:10 ratios and applied to cotton fabric using screen-printing at 120 and 150 °C for 5 and 10 min. FTIR analysis confirmed the presence of hydroxyl and carbonyl functional groups. Postmordanting with alum and ferrous sulfate (5 and 10 g/L), with or without tannic acid pretreatment, was conducted. Results showed that a higher dye ratio and temperature increased color strength, with a
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