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A Comparative Study of Sodium Sulfide and Sodium Hydroxide for Keratin Extraction from Waste Chicken Feathers Based on Response Surface Methodology (RSM). SJFSSU [Internet]. 2026 Apr. 17 [cited 2026 Apr. 20];6(1):16-23. Available from: https://journal.su.edu.ly/index.php/jsfsu/article/view/3871