Preparation of cellulose nano-crystals through a sequential process of cellulase pretreatment and acid hydrolysis

An, Xingye; Wen, Yangbing; Dong, Chen; Zhu, Xuhai; Ni, Yonghao

doi:10.1007/s10570-016-0964-4

Cited by 54 publications

(8 citation statements)

References 51 publications

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“…4a. As can be seen, CNC showed uniform needle-like shape with 250-nm length and 12-nm diameter, which was similar with the reported works (dos Santos et al 2013;Rhim et al 2015;An et al 2016). From Fig.…”

Section: Extraction Of Cellulose Nanocrystalsupporting

confidence: 91%

Preparation and characterization of cellulose nanocrystal extracted from Calotropis procera biomass

Song

Zhu

et al. 2019

Bioresour. Bioprocess.

101

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Calotropis procera fiber (CPF) is the fruit fiber of C. procera and belongs to a typical cellulosic fiber. In this study, Calotropis procera fiber (CPF) was first purified in the pretreatment process including delignification and bleaching before the isolation of cellulose nanocrystal. Chemical composition of Calotropis procera fiber was determined according to TAPPI standard method. It was composed of 64.0 wt% cellulose, 19.5 wt% hemicelluloses, and 9.7 wt% of lignin. The morphology of the Calotropis procera fiber and fiber after each pretreatment process was also investigated. Cellulose nanocrystal was extracted by classical sulfuric acid hydrolysis of the pretreated Calotropis procera fiber. TEM and SEM were used to analyze the morphologies of the obtained CNC. The crystallinity, thermal stability and suspension stability of the CNC were also investigated. The interesting results proved that this under-utilized biomass could be exploited as a new source of cellulose raw material for the production of cellulose nanocrystal. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Section: Extraction Of Cellulose Nanocrystalsupporting

confidence: 91%

Preparation and characterization of cellulose nanocrystal extracted from Calotropis procera biomass

Song

Zhu

et al. 2019

Bioresour. Bioprocess.

101

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“…These results could be attributed to the presence of sulfonic acid ester groups on increasing CNF surfaces. [ 13,36 ] Surface roughness of CNF layers confirmed the size change of CNFs (Figure S2, Supporting Information). The AFM scans directly revealed the haystack morphology of the randomly packed CNFs (Figure 2b).…”

Section: Resultsmentioning

confidence: 69%

Pinecone‐Inspired Nanoarchitectured Smart Microcages Enable Nano/Microparticle Drug Delivery

Zhang

Zhou

Liu

et al. 2020

Adv Funct Materials

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Drug delivery plays a vital role in medicine and health, but the on-demand delivery of large-sized drugs using stimuli-triggered carriers is extremely challenging. Most present capsules consist of polymeric dense shells with nanosized pores (<10 nm), thus typically lack permeability for nano/ microparticle drugs. Here, a pinecone-inspired smart microcage with open network shells, assembled from cellulose nanofibrils (CNFs), is reported for nano/microparticle drug delivery. The approach allows the nanoarchitectured, functionalized CNFs to assemble into mechanically robust, haystack-like network shells with tunable large-through pores and polypeptide-anchored points on a large scale. Such open network shells can intelligently open/ close triggered by lesion stimuli, making the therapy "always on-demand." The resulting pinecone-inspired microcages exhibit integrated properties of superior structural stability, superhydrophilicity, and pH-triggered, smart across-shell transport of emerging antimicrobial silver nanoparticles and bioactive silicate nanoplatelets (sizes of >100 nm), which enable both extraordinary anti-infection and bone regeneration. This work provides new insights into the design and development of multifunctional encapsulation and delivery carriers for medical and environmental applications.

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“…In the work described in this paper, a two-stage treatment process combining enzymatic treatment and mechanical refining was investigated to improve the oxidation efficiency of bleached bamboo kraft pulp during TEMPO-mediated oxidation and facilitate the production of NFC. Based on previous literature, 26,33 we hypothesized that the combination of cellulase treatment and mechanical refining can increase the fibre surface area, improve the accessibility of cellulose, and break down cellulose hydrogen bonds, thereby improving the TEMPO-mediated oxidation of cellulose and reducing energy consumption during the HPH process. Our results indicated that the utilization of a two-stage cellulase/mechanical refining treatment significantly facilitated the NFC production process, and improved the yield and decreased the fibril diameter of the resultant NFC.…”

Section: Introductionmentioning

confidence: 99%

Improving the production of nanofibrillated cellulose from bamboo pulp by the combined cellulase and refining treatment

Yuan

Wei

Wen

2019

J of Chemical Tech & Biotech

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BACKGROUND: Nanofibrillated cellulose (NFC) has shown great potential for wide applications in various fields and industries such as food, coatings, daily chemicals, superabsorbent high-strength materials, and other high-value products. Bamboo, with a chemical composition and fibre properties comparable to wood, is considered as an ideal nonwood material for the production of high-quality NFC. However, the normally used two-step process [TEMPO-mediated oxidation and high-pressure homogenization (HPH)] not only requires high amounts of energy, but also results in high heterogeneity of the resultant nanocellulose products. RESULTS:In this study, we proposed a sequential treatment method combining cellulase treatment followed by mechanical refining to improve the process for NFC production from bleached bamboo kraft pulp. The results showed that cellulase treatment using an enzyme dosage of 7 U g −1 cellulose followed by mechanical refining for 5000 revolutions increased the content of carboxyl group in treated pulp from 0.46 to 0.90 mmol g −1 cellulose following TEMPO-mediated oxidation. The effect of cellulase treatment and mechanical refining on the fibre properties was investigated in terms of freeness, fibre length, water retention value, pore volume and other fibrillation characteristics, such as the diameter of the NFC fibrils. Finally, we also found that, using the above-proposed process, ca. 85 g high-quality NFC could be produced from 100 g bleached bamboo pulp.CONCLUSIONS: This study demonstrated that the combination of cellulase treatment and mechanical refining is a promising strategy to produce high-quality NFC with short fibril diameter while increasing NFC yield and reducing energy consumption during HPH.

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Preparation of cellulose nano-crystals through a sequential process of cellulase pretreatment and acid hydrolysis

Cited by 54 publications

References 51 publications

Preparation and characterization of cellulose nanocrystal extracted from Calotropis procera biomass

Preparation and characterization of cellulose nanocrystal extracted from Calotropis procera biomass

Pinecone‐Inspired Nanoarchitectured Smart Microcages Enable Nano/Microparticle Drug Delivery

Improving the production of nanofibrillated cellulose from bamboo pulp by the combined cellulase and refining treatment

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