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Salem KS, Kasera NK, Rahman MA, Jameel H, Habibi Y, Eichhorn SJ, French AD, Pal L, Lucia LA. Comparison and assessment of methods for cellulose crystallinity determination. Chem Soc Rev 2023; 52:6417-6446. [PMID: 37591800 DOI: 10.1039/d2cs00569g] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/19/2023]
Abstract
The degree of crystallinity in cellulose significantly affects the physical, mechanical, and chemical properties of cellulosic materials, their processing, and their final application. Measuring the crystalline structures of cellulose is a challenging task due to inadequate consistency among the variety of analytical techniques available and the lack of absolute crystalline and amorphous standards. Our article reviews the primary methods for estimating the crystallinity of cellulose, namely, X-ray diffraction (XRD), nuclear magnetic resonance (NMR), Raman and Fourier-transform infrared (FTIR) spectroscopy, sum-frequency generation vibrational spectroscopy (SFG), as well as differential scanning calorimetry (DSC), and evolving biochemical methods using cellulose binding molecules (CBMs). The techniques are compared to better interrogate not only the requirements of each method, but also their differences, synergies, and limitations. The article highlights fundamental principles to guide the general community to initiate studies of the crystallinity of cellulosic materials.
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Affiliation(s)
- Khandoker Samaher Salem
- Department of Applied Chemistry and Chemical Engineering, University of Dhaka, Dhaka-1000, Bangladesh.
- Department of Forest Biomaterials, North Carolina State University, Raleigh, NC, USA.
| | - Nitesh Kumar Kasera
- Department of Applied Chemistry and Chemical Engineering, University of Dhaka, Dhaka-1000, Bangladesh.
- Department of Biological and Agricultural Engineering, North Carolina State University, Raleigh, NC, USA
| | - Md Ashiqur Rahman
- Department of Applied Chemistry and Chemical Engineering, University of Dhaka, Dhaka-1000, Bangladesh.
- National Institute of Textile Engineering and Research, University of Dhaka, Dhaka-1000, Bangladesh
| | - Hasan Jameel
- Department of Forest Biomaterials, North Carolina State University, Raleigh, NC, USA.
| | - Youssef Habibi
- Sustainable Materials Research Center (SUSMAT-RC), University Mohamed VI Polytechnic (UM6P), Lot 660, Hay Moulay Rachid, Benguerir, 43150, Morocco
| | - Stephen J Eichhorn
- Bristol Composites Institute, School of Civil, Aerospace, and Mechanical Engineering, University of Bristol, Bristol, BS8 1TR, UK
| | - Alfred D French
- United States Department of Agriculture, Agricultural Research Service, Southern Regional Research Center USDA ARS SRRC, New Orleans, LA 70124, USA
| | - Lokendra Pal
- Department of Forest Biomaterials, North Carolina State University, Raleigh, NC, USA.
| | - Lucian A Lucia
- Department of Forest Biomaterials, North Carolina State University, Raleigh, NC, USA.
- Department of Chemistry, North Carolina State University, Raleigh, CD 27695-8204, USA
- State Key Laboratory of Biobased Materials & Green Papermaking, Qilu University of Technology/Shandong Academy of Sciences, Jinan, 250353, P. R. China
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Detection of Human Neutrophil Elastase by Fluorescent Peptide Sensors Conjugated to TEMPO-Oxidized Nanofibrillated Cellulose. Int J Mol Sci 2022; 23:ijms23063101. [PMID: 35328520 PMCID: PMC8952216 DOI: 10.3390/ijms23063101] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 02/22/2022] [Accepted: 03/02/2022] [Indexed: 12/21/2022] Open
Abstract
Peptide–cellulose conjugates designed for use as optical protease sensors have gained interest for point-of-care (POC) detection. Elevated serine protease levels are often found in patients with chronic illnesses, necessitating optimal biosensor design for POC assessment. Nanocellulose provides a platform for protease sensors as a transducer surface, and the employment of nanocellulose in this capacity combines its biocompatibility and high specific surface area properties to confer sensitive detection of dilute biomarkers. However, a basic understanding of the spatiotemporal relationships of the transducer surface and sensor disposition is needed to improve protease sensor design and development. Here, we examine a tripeptide, fluorogenic elastase biosensor attached to TEMPO-oxidized nanofibrillated cellulose via a polyethylene glycol linker. The synthetic conjugate was found to be active in the presence of human neutrophil elastase at levels comparable to other cellulose-based biosensors. Computational models examined the relationship of the sensor molecule to the transducer surface. The results illustrate differences in two crystallite transducer surfaces ((110) vs. (1−10)) and reveal preferred orientations of the sensor. Finally, a determination of the relative (110) vs. (1−10) orientations of crystals extracted from cotton demonstrates a preference for the (1−10) conformer. This model study potentiates the HNE sensor results for enhanced sensor activity design.
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Khodayari A, Thielemans W, Hirn U, Van Vuure AW, Seveno D. Cellulose-hemicellulose interactions - A nanoscale view. Carbohydr Polym 2021; 270:118364. [PMID: 34364609 DOI: 10.1016/j.carbpol.2021.118364] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 06/14/2021] [Accepted: 06/17/2021] [Indexed: 01/01/2023]
Abstract
In this work, we study interactions of five different hemicellulose models, i.e. Galactoglucomannan, O-Acetyl-Galactoglucomannan, Fuco-Galacto-Xyloglucan, 4-O-Methylglucuronoxylan, and 4-O-Methylglucuronoarabinoxylan, and their respective binding strength to cellulose nanocrystals by molecular dynamics simulations. Glucuronoarabinoxylan showed the highest free energy of binding, whereas Xyloglucan had the lowest interaction energies amongst the five models. We further performed simulated shear tests and concluded that failure mostly happens at the inter-molecular interaction level within the hemicellulose fraction, rather than at the interface with cellulose. The presence of water molecules seems to have a weakening effect on the interactions of hemicellulose and cellulose, taking up the available hydroxyl groups on the surface of the cellulose for hydrogen bonding. We believe that these studies can shed light on better understanding of plant cell walls, as well as providing evidence on variability of the structures of different plant sources for extractions, purification, and operation of biorefineries.
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Affiliation(s)
- Ali Khodayari
- Department of Materials Engineering, KU Leuven, Leuven, Belgium.
| | - Wim Thielemans
- Sustainable Materials Lab, Department of Chemical Engineering, KU Leuven, campus Kulak Kortrijk, Etienne Sabbelaan 53, 8500 Kortrijk, Belgium
| | - Ulrich Hirn
- Institute of Bioproducts and Paper Technology, TU Graz, Graz, Austria
| | | | - David Seveno
- Department of Materials Engineering, KU Leuven, Leuven, Belgium
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