Visual analysis of the morphological features and polysaccharide distribution of raw ramie and their influence on degumming

Li, Pandeng; Shu, Tong; Bai, Yun; Yu, Tianyi; Xiang, Mengxiong; Fang-yu, Fu; Fu, Chunhua; Yang, Ying; Yu, Liang

doi:10.1007/s10570-020-03599-4

“…However, pectinase degumming still has low enzyme activity, long time-consuming, and unstable quality of the prepared fiber. In addition, hemicellulose is interwoven with pectin to bond the fibers together (Khalili et al 2002), and xylan is the main component in hemicellulose (Li et al 2021). The removal of hemicellulose is essential for the degumming process, and xylanase can effectively hydrolyze xylan to remove hemicellulose, which has a significant contribution to fiber separation.…”

Section: Introductionmentioning

confidence: 99%

The physical and chemical properties of hemp fiber prepared by alkaline pectinase–xylanase system

Zhao

¹

,

Qin

²

,

Zhang

³

et al. 2022

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Degumming is the vital and critical step in the preparation of hemp fiber for textile application.However, the traditional chemical degumming processes use large amounts of harmful chemicals, especially strong alkalis, which have caused severe challenges to the environment. The reaction conditions of alkaline pectinase and alkaline pectinase were studied in this research, and the alkaline pectinase-xylanase system was successfully applied to the degumming of hemp fibers at mild conditions (T=55 ℃ and pH=8.0) without strong alkali. A comparative analysis of hemp fibers treated under different conditions showed that the gum removal ratio could reach about 50% within 5.5 h of alkaline pectin-xylanase system degumming, making fiber smoother and stronger. After alkaline pectin-xylanase system treatment (0.6 g pectinase, 0.3 g xylanase, 55 ℃, pH 8.0, 5.5 h), the removal ratio of pectin and hemicellulose reached 75 % and 40 %, respectively. And linear density and tenacity of the fiber was 17.4 dtex and 5.62 cN/dtex, respectively. SEM, FT-IR and XRD analysis furthermore demonstrated the excellent effects of the proposed process. The degumming fiber had better water retention performance (513 %) and moisture sorption (8.9 %), which has more excellent application prospects in the textile industry. Moreover, the method abandons the use of acid and alkali and can provide an eco-friendly degumming process for hemp fiber.

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“…As a result, the ester group O-CQO was formed, thus making the synthesized CNFs with hydrophobic properties, but the CNCs were hydrophilic because they did not contain the ester group. 25 The characteristic peaks at 1508 to 1269 cm À1 belonged to the CQO tensile vibration of the xylan acetyl group in hemicellulose, and the intensity of the characteristic peaks of CNFs at 1508 to 1269 cm À1 was significantly less than that of CNCs, suggesting that a greater amount of hemicellulose was removed. 26 Chaotic short characteristic peaks from 927 to 1250 cm À1 belonged to the vibrating aromatic rings in lignin and cellulose, and the intensity of the characteristic peak of CNFs was significantly less than that of CNCs, suggesting that the removal rate of lignin in CNFs was higher than that in CNCs.…”

Section: Resultsmentioning

confidence: 97%

Preparation of nanocellulose by a biological method from hemp stalk in contrast to the chemical method and its application on the electrospun composite film

Zhang

¹

,

Guo

²

,

Liu

³

et al. 2023

J. Mater. Chem. B

1

0

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“…Safranine is a common azo dye used for plant microscopy, particularly as a stain for tissues that have been lignified, including the xylem. Safranine fluorescently marks the wood cell wall, causing green/yellow fluorescence in the secondary cell wall and red/orange fluorescence in the area of the middle lamella (ML) [48,49].…”

Section: Fiber Lengthmentioning

confidence: 99%

Proximate Chemical Analysis and Effect of Age and Height of Oxytenanthera abyssinica on Fiber Morphology and Chemical Compositions for Pulp and Paper Production Potential

Abate

¹

,

Bachheti

²

,

Tadesse

³

et al. 2023

International Journal of Polymer Science

4

0

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This study examined the chemical composition, fiber morphology, and physical properties of Oxytenanthera abyssinica culm to assess its pulping potential. Technical Association of the Pulp and Paper Industry (TAPPI) and Franklin’s methods have been used for experiments. The statistical analysis showed that the chemical composition of O. abyssinica is influenced by the age of the plant. The amount of cellulose in the culm increases with age, while hand extractive content decreases with age. The average chemical content of the three years aged O. abyssinica was 49.26 ± 0.13 wt%, 21.31 ± 0.15 wt%, and 20.63 ± 0.12 wt% for cellulose, hemicellulose, and lignin contents, respectively. A significant difference exists between 1, 2, and 3-year aged plants ( P < 0.05 ) in cellulose, lignin, ash, and extractive content. The position of the culm also affects the fiber morphology of O. abyssinica. The fiber’s length, diameter, cell wall thickness, and lumen diameter increase from top to bottom, whereas the flexibility and slenderness ratio decrease. The average fiber morphology of O. abyssinica was flexibility ratio ( 0.72 ± 0.10 ), Runkel ratio ( 0.35 ± 0.10 ), slenderness ratio ( 109.98 ± 0.21 ), lumen diameter ( 15.63 ± 0.03 μm), cell wall thickness ( 2.74 ± 0.03 μm), fiber length ( 2.40 ± 0.10 mm), and fiber diameter ( 21.83 ± 0.09 μm). The above data showed that the mean value of the fiber length of the plant is greater than 1.5 mm, the Runkel ratio was less than 1, and the slenderness ratio was greater than 70 standard values. The result also showed that the average bulk density and the moisture content were 660 kg/m3 and 9.6%, respectively. Although O. abyssinica is widely grown in the study area, no comprehensive studies have been carried out on fiber morphology, chemical composition, and physical properties based on age and height. Thus, this research was carried out to study the plant’s fiber characteristics to assess its suitability for pulp and paper production. Based on the above data, the 3-year aged bottom part of O. abyssinica is recommended for more yield pulp and high-quality paper production than the first and second-year aged plant.

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Visual analysis of the morphological features and polysaccharide distribution of raw ramie and their influence on degumming

Cited by 9 publications

References 47 publications

The physical and chemical properties of hemp fiber prepared by alkaline pectinase–xylanase system

The physical and chemical properties of hemp fiber prepared by alkaline pectinase–xylanase system

Preparation of nanocellulose by a biological method from hemp stalk in contrast to the chemical method and its application on the electrospun composite film

Proximate Chemical Analysis and Effect of Age and Height of Oxytenanthera abyssinica on Fiber Morphology and Chemical Compositions for Pulp and Paper Production Potential

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