Crystalline structure and thermal property characterization of chitin from Antarctic krill (Euphausia superba)

Wang, Yanchao; Chang, Yaoguang; Yu, Long; Zhang, Cuiyu; Xu, Xiaoqi; Xue, Yong; Li, Zhaojie; Xue, Changhu

doi:10.1016/j.carbpol.2012.09.084

Cited by 179 publications

(96 citation statements)

References 53 publications

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“…The DTGmax value determined between 300 -400 o C for α-chitin [35]. The DTGmax values were reported around 350 °C for crustaceans, around 380°C for insects, 341 o C for F. pinicola and 342 o C for X. parietina [22,25,26,31,33]. A similar result was recorded for potato beetle (Leptinotarsa decemlineata) larvae (DTGmax: 307 °C) by Kaya et al [36].…”

Section: Tgasupporting

confidence: 69%

“…Of these, 9.38° and 19.60° were the peaks with higher intensity while other peaks with lower intensity. It was reported that crustacean chitins has two sharp peaks around 9° and 19° [33]. These peaks are typical crystal patterns of α-chitin.…”

Section: Xrdmentioning

confidence: 99%

“…The mass loss in the first step proceed from evaporation of water in the chitin structure and the mass loss in the second step results from degradation of carbohydrate [21]. Similarly, mass loss of chitins from crustacean, insect, lichen and some mushroom species also occurred in two steps [21,23,26,33].…”

Section: Tgamentioning

confidence: 99%

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Chitin extraction and chitosan production from cell wall of two mushroom species (Lactarius vellereus and Phyllophora ribis)

Erdoğan

Kaya

Akata

2017

AIP Conference Proceedings

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Abstract.Chitin is an important polysaccharide found as supporting material in the cell wall of mushrooms. In this study, chitin and chitosan were obtained from the cell wall of two different mushroom species using chemical method and physicochemically characterized. The dry weight chitin contents of the mushroom species were determined as 11.4% for Lactarius vellereus and 7.9% for Phyllophora ribis. Chitosan yields of the chitins isolated from L. vellereus and P. ribis were 73.1% and 75.3%, respectively. While, the maximum degradation temperatures of L. vellereus and P. ribis chitins were found to be 354°C and 275°C by thermogravimetric analysis (TGA), the maximum degradation temperature of the chitosans obtained from these chitins were recorded as 262°C and 229°C, respectively. The crystalline index values of L. vellereus and P. ribis chitins were calculated as 64% and 49%, respectively according to the X-ray diffraction analysis (XRD) results. The scanning electron microscopy (SEM) indicated that there were no nanofiber or nanopores on the surface of the chitins and chitosans obtained from these two mushroom species. The results of this study revealed that L. vellereus and P. ribis had higher chitin contents than some other insects and mushroom species recorded in the literature and these species may be used as a potential chitin sources.

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Section: Tgasupporting

confidence: 69%

Section: Xrdmentioning

confidence: 99%

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Chitin extraction and chitosan production from cell wall of two mushroom species (Lactarius vellereus and Phyllophora ribis)

Erdoğan

Kaya

Akata

2017

AIP Conference Proceedings

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“…When the results of TGA analyses of chitin and chitosan are considered from previous studies, the mass loss was observed at two stages, which is the same as in the current study [25,26,29,34]. Nevertheless, when we consider the results in the former studies, it was found that the thermal stability of chitin is higher than chitosan [25].…”

Section: Tgamentioning

confidence: 41%

“…However, bat guano had a slightly lower chitin content than cicada sloughs. Similarly, it was found that krill and Artemia cyst structures have high chitin contents, like the bat guano [28,29]. Nevertheless, bat guano will be a more prominent source compared with krill and Artemia cyst structures thanks to the natural stocks and easy collection.…”

Section: Resultsmentioning

confidence: 99%

Bat guano as new and attractive chitin and chitosan source

et al. 2014

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Introduction: Chitin is a biopolymer that forms the exoskeleton of arthropods, and is found in the cell walls of fungi. It has a wide range of uses in fields such as cosmetics, pharmacy, medicine, bioengineering, agriculture, textiles and environmental engineering based upon its nontoxic, ecofriendly, biocompability and biodegradability characteristics. Commercially, chitin is obtained from processing the outer skeleton of Crustacea such as shrimp, crab, prawn and crayfish after they have been consumed as food. The study aims to examine the nature of bat guano and to determine if it is a practical source of chitin, which has not been done previously.Results: In this study, the chitin content of dry bat guano samples was found to be 28%. The bat guano, which was collected from Karacamal Cave, came from the bat species Rhinolophus hipposideros. The chitosan yield of this chitin was 79%. The chitin produced from the bat guano was determined to be in the alpha form according to Fourier transform infrared spectroscopy (FTIR) results. The crystallinity of the chitin and chitosan samples was calculated as 85.49 and 58.51% respectively by X-ray crystallography (XRD) experiments. According to scanning electron microscope (SEM) micrographs, the chitin and chitosan structures were shaped like nanofibers. The thermogravimetric analysis (TGA) results showed that both chitin and chitosan had two step weight losses, which are characteristic of these materials. The nitrogen content of the chitin and chitosan was 6.47 and 7.3% respectively according to the elemental analysis results. Conclusions:In this research, it has been observed that bat guano can be considered to be an alternative source of chitin and chitosan to crab, shrimp, crayfish and krill.

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A Chemically Self‐Charging Flexible Solid‐State Zinc‐Ion Battery Based on VO₂ Cathode and Polyacrylamide–Chitin Nanofiber Hydrogel Electrolyte

Liu

Mei

et al. 2021

Advanced Energy Materials

109

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energy, and kinetic energy have been developed. [2] In these self-charging power systems, energy resources are essential. Nonetheless, in some specific conditions, external energy resources are not always available. Furthermore, the components of rechargeable batteries integrated with external energy resources were complicated compared with two-electrode cells, for example, photoelectrodes in photorechargeable batteries were required. [3] Chemical energy, as a kind of internal energy from molecules, can be converted into electric energy by redox reaction. [4,5] Chemical energy of oxygen in air makes metal-air batteries attractive, and can be utilized to charge other energy storage devices. [6] However, when the charge of metal-air batteries and other energy storage devices are exhausted, external power charge is also required. Therefore, seeking a self-charging system that does not require externally applied energy is of great significance to future battery development.Vanadium oxide (VO 2 ), as a promising cathode for aqueous zinc-ion battery (AZIB), has attracted much attention due to their high capacities, low cost, and various redox properties. [7][8][9] Wang et al. developed a low cost quasi-solid-state aquation zinc ion microbattery based on VO 2multi-walled carbon nanotubes with ultrahigh energy density, and the battery also shows excellent flexibility and thermostability. [10] In the fully discharged state, the reduction of vanadium occurs with the Zn 2+ insertion, and low-valent vanadium Conventional self-charging systems are generally complicated and highly reliant on the availability of energy sources. Herein, a chemically selfcharging, flexible solid-state zinc ion battery (ssZIB) based on a vanadium dioxide (VO 2 ) cathode and a polyacrylamide-chitin nanofiber (PAM-ChNF) hydrogel electrolyte is developed. With a power density of 139.0 W kg -1 , the ssZIBs can deliver a high energy density of 231.9 Wh kg -1 . The superior electrochemical performance of the ssZIBs is attributed to the robust tunnel structure of the VO 2 cathode and the entangled network of PAM-ChNF electrolyte, which provide efficient pathways for ion diffusion. Impressively, the designed ssZIBs can be chemically self-charged by the redox reaction between the cathode and oxygen in ambient conditions. After oxidation for 6 h in air, the ssZIBs manifest a high discharging capacity of 263.9 mAh g -1 at 0.2 A g -1 , showing excellent self-rechargeability. With the assistance of a small amount of acetic acid added to the hydrogel electrolyte, the galvanostatic discharging and chemical self-charging cycles can reach 20. More importantly, such ssZIBs are able to operate well at chemical or/and galvanostatic charging hybrid modes, demonstrating superior reusability. This work brings a new prospect for designing flexible chemically self-charging ssZIBs for portable self-powered systems.

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Crystalline structure and thermal property characterization of chitin from Antarctic krill (Euphausia superba)

Cited by 179 publications

References 53 publications

Chitin extraction and chitosan production from cell wall of two mushroom species (Lactarius vellereus and Phyllophora ribis)

Chitin extraction and chitosan production from cell wall of two mushroom species (Lactarius vellereus and Phyllophora ribis)

Bat guano as new and attractive chitin and chitosan source

A Chemically Self‐Charging Flexible Solid‐State Zinc‐Ion Battery Based on VO₂ Cathode and Polyacrylamide–Chitin Nanofiber Hydrogel Electrolyte

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Crystalline structure and thermal property characterization of chitin from Antarctic krill (Euphausia superba)

Cited by 179 publications

References 53 publications

Chitin extraction and chitosan production from cell wall of two mushroom species (Lactarius vellereus and Phyllophora ribis)

Chitin extraction and chitosan production from cell wall of two mushroom species (Lactarius vellereus and Phyllophora ribis)

Bat guano as new and attractive chitin and chitosan source

A Chemically Self‐Charging Flexible Solid‐State Zinc‐Ion Battery Based on VO2 Cathode and Polyacrylamide–Chitin Nanofiber Hydrogel Electrolyte

Contact Info

Product

Resources

About

A Chemically Self‐Charging Flexible Solid‐State Zinc‐Ion Battery Based on VO₂ Cathode and Polyacrylamide–Chitin Nanofiber Hydrogel Electrolyte