īenitez V, Rebollo-Hernanz M, Hernanz S et al (2019) Coffee parchment as a new dietary fiber ingredient: functional and physiological characterization. 18īekalo SA, Reinhardt H-W (2010) Fibers of coffee husk and hulls for the production of particleboard. Īpuzzo III J (2018) Cellulosic composition containing coffee parchment cellulose and uses thereof. The optimal conditions for cellulose extraction from coffee parchment are 5% (v/v) of HNO 3 by 2 h, 3% (m/v) NaOH by 60 min, and a 1:1 mass of NaClO:CH 3COOH by 45 min for bleaching.Īit Benhamou A, Kassab Z, Nadifiyine M et al (2021) Extraction, characterization and chemical functionalization of phosphorylated cellulose derivatives from giant reed plant. However, for brightness, the precursor concentration affects the cellulose quality. In the bleaching process, a variation in the factors does not significantly influence the response variable. The design of the experiment results suggests that the main factors during acid and alkaline hydrolysis are the concentration of the chemical precursors. However, in coffee parchment, the microfibrils are twisted, giving the appearance of fibers with a minor diameter. This dissolution enhances the crystalline index and decreases the microfibril’s diameter. Lignocellulosic compound dissolution produces a reduction/disappearance of some vibrational bands. Obtained results suggest that acid hydrolysis breaks down the lignocellulosic compounds from the coffee parchment, and alkaline hydrolysis allows the solubilization of lignin and hemicellulose. TGA, SEM, XRD, and FT-IR techniques allowed for characterizing the coffee parchment hydrolyzed and bleached. Factorial design experiments allowed studying the influence of the chemical precursor concentrations and reaction times on the mass losses. Cellulose microfibrils were isolated from coffee parchment through acid hydrolysis, alkaline hydrolysis, and bleaching.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |