Minggu, 08 Maret 2020

Green simple microwave-assisted extraction (MAE) of cellulose from Theobroma cacao L. (TCL) husk

S T C L Ndruru1, D Wahyuningrum2, B Bundjali1 and I M Arcana1
1
Physical and Inorganic Chemistry Divisions, Faculty of Mathematics and Natural
Sciences, Bandung Institute of Technology, Bandung, Indonesia, 40132

Organic Chemistry Divisions, Faculty of Mathematics and Natural Sciences, Bandung
Institute of Technology, Bandung, Indonesia, 40132


Abstract. This work had successfully produced Theobroma cacao L. (TCL) husk-based
cellulose used efficiently and friendly environmentally simple microwave-assisted extraction
(MAE) method. The microwave-assisted heating time optimization of alkaline-treatment was
carried out for 10, 20, 30 and 40 minutes. Microwave-assisted bleaching process was also
conducted using green bleaching agent H
2O2, and also utilizing microwave heating for 60
minutes. The followed treatment was filtered, neutralized, washed and overnight freeze-dried.
Fourier transform infrared (FTIR) analysis confirmed common cellulose functional groups of
TLC, are β-(1,4)-glycosidic bonds at ~897 cm
-1, O-H (hydrogen bond) at 3412 cm-1, C-H
vibration at 2902 cm
-1, C-O-C asymmetric at 1161 cm-1, and C-OH out-of-plane bending at 665
cm
-1. FTIR analysis, in addition, also studied crystallinity ratio (CrR), hydrogen bond energy
(
EH) and hydrogen bond distances (RH), while particle size analyzer (PSA), X-ray diffraction
(XRD) and thermogravimetry analysis (TGA) were carried out to confirm particles sizes,
crystallinities and thermal stability properties of TCL husk, cellulose of TCL husk and
commercial-microcrystalline cellulose (MCC), respectively.


Keywords: microwave-assisted extraction (MAE), Theobroma cacao L. (TCL), cellulose. 

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