Date of Publication
9-19-2024
Document Type
Bachelor's Thesis
Degree Name
Bachelor of Science in Chemistry
Subject Categories
Chemistry
College
College of Science
Department/Unit
Chemistry
Thesis Advisor
Drexel H. Camacho
Defense Panel Chair
Drexel H. Camacho
Defense Panel Member
Aldrin P. Bonto
Jose Paulo O. Bantang
Abstract (English)
Nata de coco or bacterial cellulose (BC) is a sustainable material that needs to be explored for novel applications. Converting the bacterial cellulose into a stable suspension of cellulose nanocrystals (CNC) adds a novel functionality to the material. This work explores the preparation of CNCs from BC using the two least used mineral acids in the hydrolysis process: hydrobromic acid and nitric acid. The objective of this work is to compare the physical and thermal properties of CNCs prepared from these two different acids and explore a novel application as an edible coating to extend the shelf life of bananas. HBr-CNC and HNO3-CNC extractions afforded CNC yields of 0.262%, and 0.374%, respectively. The physicochemical analyses of both CNCs are fairly similar with slight deviations in TEM and DSC results. The HBr extracted CNCs had an average length of 315.87(±81.84) nm and an average diameter of 21.38(±2.80) nm compared to the CNCs extracted using HNO3, which recorded an average length and diameter of 363.04(±179.91) nm and 20.32(±4.83) nm, respectively. DSC results showed deviation in the degradation temperatures of the CNCs where the HBr-CNCs degraded at about 281.7°C, while the HNO3-CNCs showed more stability, degrading at 354.6 °C. TGA analysis revealed improved thermal stability for CNCs, with higher onset degradation temperatures (HBr-CNC: 335°C; HNO3-CNC: 340°C) compared to raw cellulose. The CNC-based coating was successful in prolonging the shelf-life of banana samples.
Abstract Format
html
Language
English
Format
Electronic
Keywords
Nanostructured materials; Cellulose—Biodegradation; Bananas
Recommended Citation
Bayog, M. R., & Natividad, O. O. (2024). Extraction and characterization of cellulose nanocrystals from nata de coco (Komagataeibacter xylinus): Effect of acid treatments and its application as coating in delaying the decay of ripe banana. Retrieved from https://animorepository.dlsu.edu.ph/etdb_chem/51
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Embargo Period
9-18-2026
