Effects of Thermal Modification on the Properties of Two Vietnamese Bamboo Species. Part II: Effects on Chemical Composition

Bremer, Martina; Fischer, Steffen; Nguyen, Thanh-Duong; Wagenführ, André; Phuong, Le Xuan; Dai, Vu Huy

doi:10.15376/biores.8.1.981-993

Cited by 26 publications

(17 citation statements)

References 9 publications

(12 reference statements)

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“…Research on hemicellulose has focused on the extraction, separation, chemical derivation, hydrothermal treatment, or carbonization for energy-related applications (Schlesinger et al 2006;Brienzo et al 2009;Egüeś et al 2011;Kang et al 2012;Liu et al 2013). The chemical changes have been reported for hemicelluloses in terms of mass loss (Bremer et al 2013). To date, there has been no report on the structure change during heat treatment.…”

Section: Introductionmentioning

confidence: 99%

Thermal Treatment of Poplar Hemicelluloses at 180 to 220 °C under Nitrogen Atmosphere

Liang¹,

Wang²

2016

BioResources

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Hemicelluloses were separated from poplar wood and exposed to thermal treatment. Changes in chemical content were investigated from 180 °C to 220 °C in a nitrogen atmosphere. Fourier transform infrared spectroscopy, X-ray diffraction, and differential thermal gravimetric analysis were used to characterize the hemicellulose before and after the thermal treatment. The effects of temperature on hygroscopicity and color were measured. The results showed that hemicelluloses were sensitive to temperature. β-glucosidic bonds and side chains in hemicelluloses were cleaved around 180 °C, and the increased temperature promoted the breaking process. Esterification reactions happened during the treatment. When the treatment temperature reached 220 °C, all side chains broke down, and partial carbonization occurred. Therefore, the color became darker, and the hydrophobicity increased. This study could help to explain the changes in wood that occur during thermal treatment.

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Section: Introductionmentioning

confidence: 99%

Thermal Treatment of Poplar Hemicelluloses at 180 to 220 °C under Nitrogen Atmosphere

Liang¹,

Wang²

2016

BioResources

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“…Cellulose, hemicellulose and lignin content were determined by the Institute of Plant and Wood Chemistry (TU Dresden) according to standardized methods by Klason ( 1920 ), Kuerschner and Hoffer ( 1931 ), and Poljak ( 1948 ). Bremer et al ( 2013 ) provide details of the extraction process.…”

Section: Methodsmentioning

confidence: 99%

Adansonia digitata and Adansonia gregorii fruit shells serve as a protection against high temperatures experienced during wildfires

2018

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The thick and woody shell of the fruit of Adansonia species cannot be explained solely by adaptation to zoochory or hydrochory. Since the trunks of Adansonia possess a thick and fire-resistant bark and wildfires occur regularly in its habitat (savannah), we examined with the African Adanonia digitata and the Australian Adansonia gregorii whether the fruit offers protection against high heat typically experienced in wildfires. Heat-resistance tests were conducted by applying a simple heat test based on known temperature and temperature residence times occurring in savannah fires and complemented by tests to reveal the impact of heat on germination since long-term seed dormancy is known for Adansonia. Germination tests with acid treated and heat treated seeds were performed to establish if heat also increased germination rate as effectively as acid treatments have been found to do. Heat was found to increase germination rate, but not as effectively as treatment with acid, therefore fruits exposed to high temperatures experienced in wildfires may have a better chance of germination than fruits that were not exposed to wildfires. The ability of the investigated fruits to protect seeds from high temperatures suggests that wildfires may have played a role in the evolution of the hard-shell structure typically found in Adansonia.

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“…The density of fibres was determined to DIN EN ISO 1183-1 using a precision and a pycnometer with an accuracy 0.05 ml respectively. Cellulose, and lignin content were determined Kuerschner [14], Poljak [15] and Details of the extraction process by Bremer [17].…”

Section: Density Contents Of Hemicellulose and Ligninmentioning

confidence: 99%

Evaluation of Bast Fibres of the Stem of Carica papaya L. for Application as Reinforcing Material in Green Composites

Kempe

Göhre

Lautenschläger

et al. 2015

ARRB

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Aims: The production of green composites based on natural fibres is rising with regard to increasing environmental problems and declining fossil raw materials. Bast fibres of papaya (Carica papaya L.) accumulate on plantations at a large scale but remain an unused resource. The characterisation of the bast allows a first evaluation of the potential of papaya-fibres for use in composites. Study Design: Material testing.

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Effects of Thermal Modification on the Properties of Two Vietnamese Bamboo Species. Part II: Effects on Chemical Composition

Cited by 26 publications

References 9 publications

Thermal Treatment of Poplar Hemicelluloses at 180 to 220 °C under Nitrogen Atmosphere

Thermal Treatment of Poplar Hemicelluloses at 180 to 220 °C under Nitrogen Atmosphere

Adansonia digitata and Adansonia gregorii fruit shells serve as a protection against high temperatures experienced during wildfires

Evaluation of Bast Fibres of the Stem of Carica papaya L. for Application as Reinforcing Material in Green Composites

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