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Ko, Sung Won,Soriano, Juan Paolo E.,Rajan Unnithan, Afeesh,Lee, Ji Yeon,Park, Chan Hee,Kim, Cheol Sang Elsevier 2018 INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES Vol.110 No.-
<P><B>Abstract</B></P> <P>Cellulose I and II polymorphs were isolated from <I>Capsosiphon fulvescens</I> (CF) using the conventional method of extraction and direct mercerization of raw sample, respectively. The morphological and structural differences between the isolated polymorphs were studied by FTIR, FESEM and XRD. Direct mercerization of raw CF yielded the transformation of highly crystalline cellulose I (81.3%) to II (63.7%) as observed in the shifting of XRD patterns. The derived cellulose I and II were hydrolyzed (60% w/w H<SUB>2</SUB>SO<SUB>4</SUB>, 55°C, 1h, 10mL/g) to obtain the spindle-shaped cellulose nanocrystals. Cellulose nanocrystal I was observed to have a mean thickness and length of 12.67±2.69 and 92.31±21.31nm, respectively; while cellulose nanocrystal II has a mean thickness and length of 15.58±2.85 and 78.09±18.22nm, respectively. Furthermore, a fiber-like mat assembly, which could be used as supplement support structure for tissue engineering, was obtained after subjecting the aqueous cellulose nanocrystal suspensions to freeze-drying. A possible application of this material can be as a biocompatible and biodegradable composite for tissue engineering and other biomedical applications.</P>
Ko, Sung Won,Soriano, Juan Paolo E.,Lee, Ji Yeon,Unnithan, Afeesh Rajan,Park, Chan Hee,Kim, Cheol Sang Elsevier 2018 INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES Vol.110 No.-
<P><B>Abstract</B></P> <P>Through exhaustive extraction via successive alkali and bleaching treatments cellulose was isolated from lettuce. The isolated cellulose was hydrolyzed using 64wt% H<SUB>2</SUB>SO<SUB>4</SUB> at 55°C under constant stirring for 1h to obtain cellulose nanocrystals (CNCs). Characterizations such as SEM, TEM, FTIR, TGA and XRD were done in order to determine differences in the physico-chemical characteristics of cellulose after each treatment step. The isolated CNCs have mean dimensions of 237±26, 33±12 and 32±7nm in length, thickness and height, respectively. These nanocrystals were incorporated to the formulations that were used to fabricate different chitosan-g-<SMALL>D</SMALL>,<SMALL>L</SMALL>-lactic acid (CgLA) scaffolds. Amide linkage formation between chitosan and lactic acid and further removal of water was facilitated by oven-drying under vacuum at 80°C. Results show that an increase in the concentration of CNCs added, increase in porosity, degradability, drug release property and cell viability were observed from the fabricated composite scaffolds. These results can provide information on how nanofillers such as CNCs can alter the properties of tissue scaffolds through the chemical properties and interactions they provide. Moreover, these characteristics can give new properties that are necessary for certain tissue engineering applications.</P>