Preparation of Citral Compound and Its Bamboo Antimildew Properties

Shan, Yingying; Chen, Shiqin; Zhang, Jingjing; Du, Chungui; Li, Chunlin; Yang, Fei; Yin, Wenxiu; Shao, Yuran; Wang, Yuting

doi:10.3390/polym14214691

Cited by 8 publications

(3 citation statements)

References 29 publications

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“…After drying in an oven at 103 ± 2 • C to a constant weight, the radial and tangential lengths were measured again and denoted as L 2 . The air-drying shrinkage rate was obtained using Equation ( 2), and the full-drying shrinkage rate was determined using Equation (3). A total of 35 repetitions were conducted for each pressure treated sample and control group.…”

Section: Measurement Of Dry Shrinkagementioning

confidence: 99%

“…These drawbacks are regarded as the main obstacles to the use of bamboo as a building and industrial material [ 2 ]. In addition, the relatively high contents of carbohydrates and proteins in the tissues of bamboo are prone to insect infestation and mildew, and the corresponding tissue structure changes lead to the degradation of physical and mechanical properties [ 3 ]. Over the past several decades, many efforts have been made to modify bamboo to improve its utilization performance, and heat treatment is considered a green and environmentally friendly physical modification technique.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Heat Treatment under Different Pressures on the Properties of Bamboo

Yang

et al. 2023

Polymers

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To optimize the bamboo heat treatment process, the corresponding evolution rules under various heat treatment conditions must be determined. When the heat treatment time and temperature remained constant, the effects of different heat treatment pressures on the equilibrium moisture content, dimensional stability, mechanical properties, and chemical composition of bamboo were systematically investigated. In this experiment, bamboo without heat treatment was used as the control group. The experimental findings demonstrate the following: (1) The equilibrium moisture content of heat-treated bamboo gradually decreases with increasing treatment pressure. When the heat treatment pressure was set at 0.1, 0.15, 0.2, and 0.25 MPa, the bamboo’s equilibrium water content decreased to 12.1%, 11.7%, 9.9%, and 8.6%, respectively, while that of the control group was 13.8%. (2) The dimensional stability of bamboo was enhanced with increasing heat treatment pressure. At pressures of 0.1, 0.15, 0.2, and 0.25 MPa, the radial air-dry shrinkage rates of the heat-treated bamboo decreased to 3.4%, 3.4%, 2.6%, and 2.3%, respectively, while the tangential air-dry shrinkage rates reduced to 5.6%, 5.1%, 3.3%, and 3.0%. In comparison, the radial and tangential air-dry shrinkage rates of the control group were measured as 3.6% and 5.8%, respectively. Similarly, the radial and tangential full-dry shrinkage of bamboo exhibited a similar trend. (3) With the increase in heat treatment pressure, the bending strength and longitudinal compressive strength of bamboo exhibited an initial rise followed by a decline. When it was at heat treatment pressures of 0.1, 0.15, 0.2, and 0.25 MPa, the corresponding bending strengths of the heat-treated bamboo were measured as 41.2, 26.7, 22.4, and 20.4 MPa, respectively; while the longitudinal compressive strengths were recorded as 42.6, 38.1, 29.1, and 25.3 MPa. In comparison, the bending and longitudinal compressive strengths of the control group were measured as 39.8 and 38.5 MPa, respectively. It is evident that the optimal heat treatment pressure for bamboo is 0.1 MPa, resulting in a significant increase of 3.5% and 10.6% in bending strength and longitudinal compressive strength, respectively, compared to the control group. (4) Based on the FTIR and XRD patterns of bamboo samples, a range of physical and chemical transformations were observed during the heat treatment process, including cellulose adsorb water evaporation, hemicellulose and cellulose degradation, as well as acetyl group hydrolysis on the molecular chain of hemicellulose. These changes collectively impacted the physical and mechanical properties of bamboo.

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Section: Measurement Of Dry Shrinkagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Heat Treatment under Different Pressures on the Properties of Bamboo

Yang

et al. 2023

Polymers

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“…Chinese herbal medicines, as natural products, are safer compared to chemically synthesized antimicrobial drugs [ 10 , 11 , 12 ]. The components of Chinese herbal medicines are extremely complex, and the extraction and separation of their active antimicrobial ingredients can improve the efficiency of mildew inhibitors [ 13 , 14 , 15 , 16 ]. Some Chinese herbal medicines have identified antimicrobial monomers [ 17 , 18 , 19 ] and determined their chemical structures [ 20 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Antimildew Effect of Three Phenolic Compounds and the Efficacy of Antimildew Sliced Bamboo Veneer

Chen

Shan

et al. 2023

Molecules

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The development of the bamboo industry has been hindered by environmental issues caused by the application of bamboo preservatives. Chinese herbal phenolic compounds have been shown to possess broad-spectrum, potent antimildew properties, making them promising candidates for the development of new bamboo mildew inhibitors. In this study, we investigated the antimildew properties of three phenolic compounds, eugenol, carvacrol, and paeonol, against common mildews in bamboo materials using the Oxford cup method and the double-dilution method. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to analyze the antimildew mechanism and its effects on mildew cell morphology. Our results showed that carvacrol exhibited the strongest antimildew activity, with minimum inhibitory concentration (MIC) and minimum fungicidal concentration (MFC) values of 1.56 mg/mL and 1.76 mg/mL, respectively, followed by eugenol and paeonol. At a concentration of 25 mg/mL, eugenol and carvacrol had an inhibitory rate of over 50% against various mildews. Different concentrations of the three compounds significantly disrupted the morphology and structural integrity of mildew hyphae, with the extent of damage increasing with concentration and treatment duration. In the sliced bamboo mildew prevention experiment, carvacrol at a concentration of 29.25 mg/mL was found to be highly effective against all tested mildews. Our study provides new insights and a theoretical basis for the development of eco-friendly bamboo mildew inhibitors based on plant phenolic compounds.

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