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Lorentzen JC, Ekberg O, Alm M, Björk F, Harderup LE, Johanson G. Mold Odor from Wood Treated with Chlorophenols despite Mold Growth That Can Only Be Seen Using a Microscope. Microorganisms 2024; 12:395. [PMID: 38399798 PMCID: PMC10891868 DOI: 10.3390/microorganisms12020395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2024] [Revised: 01/30/2024] [Accepted: 02/03/2024] [Indexed: 02/25/2024] Open
Abstract
We previously reported that indoor odorous chloroanisoles (CAs) are still being emitted due to microbial methylation of hazardous chlorophenols (CPs) present in legacy wood preservatives. Meanwhile, Swedish researchers reported that this malodor, described since the early 1970s, is caused by hazardous mold. Here, we examined to what extent CP-treated wood contains mold and if mold correlates with perceived odor. We found no studies in PubMed or Web of Science addressing this question. Further, we investigated two schools built in the 1960s with odor originating from crawlspaces. No visible mold was evident in the crawlspaces or on the surfaces of treated wood samples. Using a microscope, varying amounts of mold growth were detected on the samples, all containing both CP(s) and CA(s). Some samples smelled, and the odor correlated with the amount of mold growth. We conclude that superficial microscopic mold on treated wood suffices produced the odor. Further, we argue that CPs rather than mold could explain the health effects reported in epidemiological studies that use mold odor as an indicator of hazardous exposure.
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Affiliation(s)
- Johnny C. Lorentzen
- Integrative Toxicology, Institute of Environmental Medicine, Karolinska Institutet, SE-171 77 Stockholm, Sweden;
- Centre for Occupational and Environmental Medicine, Region Stockholm, SE-113 65 Stockholm, Sweden
| | - Olle Ekberg
- Division of Building Physics, Lund University, SE-221 00 Lund, Sweden; (O.E.); (L.-E.H.)
| | - Maria Alm
- Urban Property Department, SE-402 26 Gothenburg, Sweden;
| | - Folke Björk
- KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden;
| | - Lars-Erik Harderup
- Division of Building Physics, Lund University, SE-221 00 Lund, Sweden; (O.E.); (L.-E.H.)
| | - Gunnar Johanson
- Integrative Toxicology, Institute of Environmental Medicine, Karolinska Institutet, SE-171 77 Stockholm, Sweden;
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Zhou J, Jin L, Wu X, Wang H, Han S, Zhang Y, Sun F. Exploration of Optimal Reaction Conditions for Constructing Hydrophobic Polymers with Low Deformation to Facilitate the Dimensional Stability of Laminated Bamboo Lumber. Polymers (Basel) 2023; 15:2637. [PMID: 37376283 DOI: 10.3390/polym15122637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 05/14/2023] [Accepted: 05/31/2023] [Indexed: 06/29/2023] Open
Abstract
The environmental moisture changes would result in the deformation and cracking of laminated bamboo lumber (LBL) easily due to the unreleased internal stress, leading to poor durability. In this study, a hydrophobic cross-linking polymer with low deformation was successfully fabricated and introduced in the LBL by polymerization and esterification to improve its dimensional stability. In an aqueous solution, the 2-hydroxyethyl methacrylate (HEMA) and Maleic anhydride (MAh) were employed as the base compounds for synthesizing the copolymer of 2-hydroxyethyl methacrylate and maleic acid (PHM). The hydrophobicity and swelling performance of the PHM was adjusted by controlling the reaction temperatures. PHM-modified LBL's hydrophobicity as indicated by the contact angle, increased from 58.5° to 115.2°. The anti-swelling efficiency was also improved. Moreover, multiple characterizations were applied to clarify the structure of PHM and its bonding linkages in LBL. This study demonstrates an efficient avenue to facilitate the dimensional stability of LBL by PHM modification and sheds new light on the efficient utilization of LBL using a hydrophobic polymer with low deformation.
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Affiliation(s)
- Jianchao Zhou
- College of Chemistry and Materials Engineering, National Engineering & Technology Research Center for the Comprehensive Utilization of Wood-Based Resources, Zhejiang A&F University, Hangzhou 311300, China
| | - Li Jin
- College of Chemistry and Materials Engineering, National Engineering & Technology Research Center for the Comprehensive Utilization of Wood-Based Resources, Zhejiang A&F University, Hangzhou 311300, China
| | - Xinxing Wu
- College of Chemistry and Materials Engineering, National Engineering & Technology Research Center for the Comprehensive Utilization of Wood-Based Resources, Zhejiang A&F University, Hangzhou 311300, China
| | - Hui Wang
- College of Chemistry and Materials Engineering, National Engineering & Technology Research Center for the Comprehensive Utilization of Wood-Based Resources, Zhejiang A&F University, Hangzhou 311300, China
| | - Shuaibo Han
- College of Chemistry and Materials Engineering, National Engineering & Technology Research Center for the Comprehensive Utilization of Wood-Based Resources, Zhejiang A&F University, Hangzhou 311300, China
| | - Yan Zhang
- College of Chemistry and Materials Engineering, National Engineering & Technology Research Center for the Comprehensive Utilization of Wood-Based Resources, Zhejiang A&F University, Hangzhou 311300, China
| | - Fangli Sun
- College of Chemistry and Materials Engineering, National Engineering & Technology Research Center for the Comprehensive Utilization of Wood-Based Resources, Zhejiang A&F University, Hangzhou 311300, China
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Liu C, Chen S, Shan Y, Du C, Zhu J, Bao Q, Shao Y, Yin W, Yang F, Ran Y, Wang Y. Screening of Ionic Liquids against Bamboo Mildew and Its Inhibition Mechanism. Molecules 2023; 28:molecules28083432. [PMID: 37110666 PMCID: PMC10145214 DOI: 10.3390/molecules28083432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 03/31/2023] [Accepted: 04/10/2023] [Indexed: 04/29/2023] Open
Abstract
Ionic liquids are a class of organic molten salts that consist entirely of cations and anions. They are characterized by their low vapor pressure, low viscosity, low toxicity, high thermal stability, and strong antifungal potential. In this study, the inhibitory performance of ionic liquid cations against Penicillium citrinum, Trichoderma viride, and Aspergillus niger was investigated, along with the mechanism of cell membrane disruption. The Oxford cup method, SEM, and TEM were employed to examine the extent of damage and the specific site of action of ionic liquids on the mycelium and cell structure of these fungi. The results showed that 1-decyl-3-methylimidazole had a strong inhibitory effect on TV; benzyldimethyldodecylammonium chloride had a weak inhibitory effect on PC, TV, AN, and a mixed culture; while dodecylpyridinium chloride exhibited significant inhibitory effects on PC, TV, AN, and Mix, with more prominent effects observed on AN and Mix, exhibiting MIC values of 5.37 mg/mL, 5.05 mg/mL, 5.10 mg/mL, and 5.23 mg/mL, respectively. The mycelium of the mildews showed drying, partial loss, distortion, and uneven thickness. The cell structure showed separation of the plasma wall. The absorbance of the extracellular fluid of PC and TV reached the maximum after 30 min, while that of AN reached the maximum after 60 min. The pH of the extracellular fluid decreased initially and then increased within 60 min, followed by a continuous decrease. These findings provide important insights for the application of ionic liquid antifungal agents in bamboo, medicine, and food.
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Affiliation(s)
- Chunlin Liu
- College of Chemistry and Materials Engineering, Zhejiang A & F University, Hangzhou 311300, China
| | - Shiqin Chen
- College of Chemistry and Materials Engineering, Zhejiang A & F University, Hangzhou 311300, China
| | - Yingying Shan
- College of Chemistry and Materials Engineering, Zhejiang A & F University, Hangzhou 311300, China
| | - Chungui Du
- College of Chemistry and Materials Engineering, Zhejiang A & F University, Hangzhou 311300, China
| | - Jiawei Zhu
- College of Chemistry and Materials Engineering, Zhejiang A & F University, Hangzhou 311300, China
| | - Qichao Bao
- College of Chemistry and Materials Engineering, Zhejiang A & F University, Hangzhou 311300, China
| | - Yuran Shao
- College of Chemistry and Materials Engineering, Zhejiang A & F University, Hangzhou 311300, China
| | - Wenxiu Yin
- College of Chemistry and Materials Engineering, Zhejiang A & F University, Hangzhou 311300, China
| | - Fei Yang
- College of Chemistry and Materials Engineering, Zhejiang A & F University, Hangzhou 311300, China
| | - Ying Ran
- College of Chemistry and Materials Engineering, Zhejiang A & F University, Hangzhou 311300, China
| | - Yuting Wang
- College of Chemistry and Materials Engineering, Zhejiang A & F University, Hangzhou 311300, China
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Shan Y, Chen S, Zhang J, Du C, Liu C, Yang F, Yin W, Shao Y, Wang Y. Preparation of Citral Compound and Its Bamboo Antimildew Properties. Polymers (Basel) 2022; 14:4691. [PMID: 36365683 PMCID: PMC9654108 DOI: 10.3390/polym14214691] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2022] [Revised: 10/26/2022] [Accepted: 10/29/2022] [Indexed: 07/30/2023] Open
Abstract
To reduce the amount of citral used without reducing the antimildew performance of bamboo, the citral compound preparation process, the distribution of the compound in bamboo, and its antimildew performance were investigated using the Oxford cup method, Fourier-transform infrared spectroscopy, and ultraviolet spectrophotometry. The results revealed that the combination of citral with cinnamaldehyde or thymol may lead to partial chemical reactions, which may change the chemical structure of citral and affect its bacteriostatic properties. The bacteriostatic properties of the citraldehyde thymol compound against common molds of bamboo were considerably superior to those of the citral cinnamaldehyde compound. The limonaldehyde thymol compound showed a low distribution trend outside and vice versa inside in the treated bamboo. The citral thymol compound exhibited good antimildew performance at a concentration of 200 mg/mL. The citral thymol compound could reduce the amount of citral by approximately 67 mg/mL without reducing the antimildew performance of bamboo.
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Antioxidant-Mediated Modification of Citral and Its Control Effect on Mildewy Bamboo. Polymers (Basel) 2022; 14:polym14214652. [DOI: 10.3390/polym14214652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2022] [Revised: 10/19/2022] [Accepted: 10/24/2022] [Indexed: 11/06/2022] Open
Abstract
To reduce the oxidative degradation of citral and improve its antimildew performance, citral was modified with natural antioxidants such as tea polyphenols, ascorbic acid, and theaflavin in the present study. Additionally, the effects of these natural antioxidants on the citral degradation rate and DPPH radical-scavenging rate, as well as the effectiveness of antioxidant-modified citral in the antimildew treatment of bamboo were investigated. Ascorbic acid, theaflavin, and tea polyphenols improved the antioxidant performance of citral to some extent, and the tea polyphenols exhibited the best antioxidant performance. When the amount of tea polyphenols added to citral reached 1.0%, the oxidative degradation of citral was effectively prevented. Compared with citral, tea-polyphenol-modified citral could reduce the efficacy of the bamboo antimildew treatment against all four mildews and the effectiveness of the antimildew treatment reached 100%. Citral modification with antioxidants reduced the amount of citral required in the treatment, thereby reducing the treatment cost for bamboo mildew.
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Surface Functionalization of Bamboo with Silver-Reduced Graphene Oxide Nanosheets to Improve Hydrophobicity and Mold Resistance. COATINGS 2022. [DOI: 10.3390/coatings12070980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A natural polyphenolic compound was used to assemble nanocomposites. Owing to its stable bioactive properties, bamboo has earned significant attention in material science. Its high nutrient content and hydrophilicity makes bamboo more vulnerable to mold attacks and shortened shelf lives. To produce efficient, multipurpose, long-life bamboo products, a novel technique involving an immersion dry hydrothermal process was applied to impregnate the bamboo with polyphenol-assisted silver-reduced graphene oxide nanosheets. Curcumin (Cur), a natural polyphenol found in the rhizome of Curcuma longa, was used in the preparation of curcumin-enhanced silver-reduced graphene oxide nanosheets (Cur-AgrGONSs). The nanocomposites and nanocomposite-impregnated bamboo materials were examined by field emission scanning electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy. At the same time, a phytopathogen was isolated from infected bamboo products and identified by internal transcribed spacer (ITS) sequences. The nanocomposites effectively inhibited the growth of the isolated fungus. The mold resistance and moisture content of both the treated and untreated bamboo timbers were also examined to determine the efficiency of the prepared nanocomposite. The antifungal activity and hydrophobicity of the bamboo materials were significantly enhanced after the incorporation of curcumin-enriched silver-loaded reduced graphene oxide nanosheets (B@Cur-AgrGONSs). This research outcome confirms that the nanocomposite is a well-organized antimicrobial material for different advanced domains.
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Water repellent coatings with hierarchal structures obtained on anodized aluminum with femtosecond laser ablation. APPLIED NANOSCIENCE 2022. [DOI: 10.1007/s13204-021-01697-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Peng R, Du C, Hu A, Li Q, Zhang J, Zhang W, Sun F. Fabrication of core-shell type poly(NIPAm)-encapsulated citral and its application on bamboo as an anti-molding coating. RSC Adv 2021; 11:36884-36894. [PMID: 35494364 PMCID: PMC9043580 DOI: 10.1039/d1ra06352a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Accepted: 11/01/2021] [Indexed: 11/21/2022] Open
Abstract
Bamboo is a widely used renewable and degradable biomass material; however, its sustainable utilisation is hindered by its susceptibility to mold. The current bamboo anti-mold technology is mainly based on organic chemical agents; these agents can easily induce mold resistance in bamboo with long-term use, and can even adversely affect human health. In the present study, the poly(N-isopropyl acrylamide) (PNIPAm)/citral nanohydrogel was prepared by encapsulating the natural antibiotic citral in PNIPAm for the anti-mold treatment of bamboo. The results revealed that this nanohydrogel exhibited a core–shell system with citral as the ‘core’ and PNIPAm as the ‘shell’, an average hydrodynamic diameter of 88.1 nm, and a low critical solution temperature (LCST) of 35.4 °C. After the high-pressure impregnation with the nanohydrogel, the bamboo strips showed excellent control effects toward common bamboo molds. Therefore, the nanohydrogel demonstrated high efficiency and it may become an ideal alternative to organic chemical anti-mold agents, thus showcasing its significant potential in the field of mold prevention for bamboo. Bamboo is a widely used renewable and degradable biomass material; however, its sustainable utilisation is hindered by its susceptibility to mold.![]()
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Affiliation(s)
- Rui Peng
- College of Chemistry and Materials Engineering, Zhejiang A & F University Hangzhou 311300 Zhejiang China
| | - Chungui Du
- College of Chemistry and Materials Engineering, Zhejiang A & F University Hangzhou 311300 Zhejiang China
| | - Ailian Hu
- College of Chemistry and Materials Engineering, Zhejiang A & F University Hangzhou 311300 Zhejiang China
| | - Qi Li
- College of Chemistry and Materials Engineering, Zhejiang A & F University Hangzhou 311300 Zhejiang China
| | - Jingjing Zhang
- College of Chemistry and Materials Engineering, Zhejiang A & F University Hangzhou 311300 Zhejiang China
| | - Weigang Zhang
- College of Chemistry and Materials Engineering, Zhejiang A & F University Hangzhou 311300 Zhejiang China
| | - Fangli Sun
- College of Chemistry and Materials Engineering, Zhejiang A & F University Hangzhou 311300 Zhejiang China
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Peng R, Zhang J, Du C, Li Q, Hu A, Liu C, Chen S, Shan Y, Yin W. Investigation of the Release Mechanism and Mould Resistance of Citral-Loaded Bamboo Strips. Polymers (Basel) 2021; 13:polym13193314. [PMID: 34641130 PMCID: PMC8512208 DOI: 10.3390/polym13193314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 09/22/2021] [Accepted: 09/24/2021] [Indexed: 11/16/2022] Open
Abstract
In the present study, the sustained-release system loading citral was synthesised by using PNIPAm nanohydrogel as a carrier and analysed its drug-release kinetics and mechanism. Four release models, namely zero-order, first-order, Higuchi, and Peppas, were employed to fit the experimental data, and the underlying action mechanism was analysed. The optimised system was applied to treat a bamboo mould, followed by assessment of the mould-proof performance. Our experimental results revealed that the release kinetics equation of the system conformed to the first order; the higher the external temperature, the better the match was. In the release process, PNIPAm demonstrated a good protection and sustained-release effect on citral. Under the pressure of 0.5 MPa, immersion time of 120 min, and the system concentration ratio of 1, the optimal drug-loading parameters were obtained using the slow-release system with the best release parameters. Compared to the other conditions, bamboos treated with pressure impregnation demonstrated a better control effect on bamboo mould, while the control effect on Penicillium citrinum, Trichoderma viride, Aspergillus niger, and mixed mould was 100% after 28 days. Moreover, the structure and colour of bamboo remained unchanged during the entire process of mould control.
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Murariu M, Galluzzi A, Paint Y, Murariu O, Raquez JM, Polichetti M, Dubois P. Pathways to Green Perspectives: Production and Characterization of Polylactide (PLA) Nanocomposites Filled with Superparamagnetic Magnetite Nanoparticles. MATERIALS 2021; 14:ma14185154. [PMID: 34576386 PMCID: PMC8467987 DOI: 10.3390/ma14185154] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 08/26/2021] [Accepted: 08/30/2021] [Indexed: 02/02/2023]
Abstract
In the category of biopolymers, polylactide or polylactic acid (PLA) is one of the most promising candidates considered for future developments, as it is not only biodegradable under industrial composting conditions, but it is produced from renewable natural resources. The modification of PLA through the addition of nanofillers is considered as a modern approach to improve its main characteristic features (mechanical, thermal, barrier, etc.) and to obtain specific end-use properties. Iron oxide nanoparticles (NPs) of low dimension (10–20 nm) such as magnetite (Fe3O4), exhibit strong magnetization in magnetic field, are biocompatible and show low toxicity, and can be considered in the production of polymer nanocomposites requiring superparamagnetic properties. Accordingly, PLA was mixed by melt-compounding with 4–16 wt.% magnetite NPs. Surface treatment of NPs with a reactive polymethylhydrogensiloxane (MHX) was investigated to render the nanofiller water repellent, less sensitive to moisture and to reduce the catalytic effects at high temperature of iron (from magnetite) on PLA macromolecular chains. The characterization of nanocomposites was focused on the differences of the rheology and morphology, modification, and improvements in the thermal properties using surface treated NPs, while the superparamagnetic behavior was confirmed by VSM (vibrating sample magnetometer) measurements. The PLA−magnetite nanocomposites had strong magnetization properties at low magnetic field (values close to 70% of Mmax at H = 0.2 T), while the maximum magnetic signal (Mmax) was mainly determined by the loading of the nanofiller, without any significant differences linked to the surface treatment of MNPs. These bionanocomposites showing superparamagnetic properties, close to zero magnetic remanence, and coercivity, can be further produced at a larger scale by melt-compounding and can be designed for special end-use applications, going from biomedical to technical areas.
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Affiliation(s)
- Marius Murariu
- Laboratory of Polymeric and Composite Materials, Materia Nova Materials R&D Center & UMons Innovation Center, 3 Avenue Copernic, 7000 Mons, Belgium; (Y.P.); (O.M.)
- Correspondence: (M.M.); (P.D.)
| | - Armando Galluzzi
- Department of Physics E.R. Caianiello, University of Salerno, and CNR-SPIN (Salerno), via Giovanni Paolo II, 84084 Fisciano, Italy; (A.G.); (M.P.)
| | - Yoann Paint
- Laboratory of Polymeric and Composite Materials, Materia Nova Materials R&D Center & UMons Innovation Center, 3 Avenue Copernic, 7000 Mons, Belgium; (Y.P.); (O.M.)
| | - Oltea Murariu
- Laboratory of Polymeric and Composite Materials, Materia Nova Materials R&D Center & UMons Innovation Center, 3 Avenue Copernic, 7000 Mons, Belgium; (Y.P.); (O.M.)
| | - Jean-Marie Raquez
- Laboratory of Polymeric and Composite Materials (LPCM), Center of Innovation and Research in Materials and Polymers (CIRMAP), University of Mons (UMONS), 7000 Mons, Belgium;
| | - Massimiliano Polichetti
- Department of Physics E.R. Caianiello, University of Salerno, and CNR-SPIN (Salerno), via Giovanni Paolo II, 84084 Fisciano, Italy; (A.G.); (M.P.)
| | - Philippe Dubois
- Laboratory of Polymeric and Composite Materials, Materia Nova Materials R&D Center & UMons Innovation Center, 3 Avenue Copernic, 7000 Mons, Belgium; (Y.P.); (O.M.)
- Laboratory of Polymeric and Composite Materials (LPCM), Center of Innovation and Research in Materials and Polymers (CIRMAP), University of Mons (UMONS), 7000 Mons, Belgium;
- Correspondence: (M.M.); (P.D.)
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Abstract
Presently, chemical agents remain the main antimildew agents for bamboo, which has a certain negative impact on the environment and human health. Therefore, it is urgent to develop new environment-friendly antimildew agents for bamboo. Here, citral, an environment-friendly natural antibacterial agent, was used as an antimildew agent for bamboo. The orthogonal test was used to explore the effects of citral concentration, impregnation pressure, and pressurization time on the drug loading capacity of treated bamboo strips. The effect of antimildew-treated bamboo strips on bamboo mold was also discussed. Furthermore, the Fourier transform infrared spectroscopy and ultraviolet spectrophotometer were used to investigate the distribution of citral in bamboo strips. Results showed that the optimum technological parameters of citral mildew-proof treatment of bamboo were as follows: citral concentration: 0.795 mg/ml, impregnation pressure: 0.3 MPa, and pressurization time: 90 min. Also, citral was easy to volatilize, which decreased the citral content of bamboo strips after vacuum drying and showed the trend of a lower surface layer and a higher inner layer. The concentration of citral therefore had a significant effect on the drug loading of the antimildew-treated bamboo strips. Thus, it was difficult to achieve effective prevention and control of bamboo mold when bamboo strips were impregnated with a lower concentration of citral solution. When the concentration of citral reached 200 mg/ml, the prevention and antimold efficiency of antimildew bamboo strips reached over 100%. This study will provide references for the development and application of environment-friendly natural antibacterial agents in the field of bamboo mildew prevention.
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Zhang J, Du C, Li Q, Hu A, Peng R, Sun F, Zhang W. Inhibition mechanism and antibacterial activity of natural antibacterial agent citral on bamboo mould and its anti-mildew effect on bamboo. ROYAL SOCIETY OPEN SCIENCE 2021; 8:202244. [PMID: 33996126 PMCID: PMC8059595 DOI: 10.1098/rsos.202244] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 03/29/2021] [Indexed: 05/14/2023]
Abstract
Bamboo, a natural material, has been widely used in the fields of decoration, architecture and furniture. However, bamboo is easy to mildew and lose its use value. In this paper, the inhibition mechanism and antibacterial activity of a natural antibacterial agent citral on bamboo mould and its anti-mildew effect on bamboo were studied. The results showed that citral could change the shape of mycelium, destroy the integrity of mycelium structure, cell wall and cell membrane structure, thereby causing leakage of nucleic acids, proteins and other substances in the cell, as well as destroy the pH balance of the inside and outside of the cell, to inhibit or kill mould. When the concentration of citral is 100 mg ml-1, the antibacterial rates of citral against Penicillium citrinum (PC), Trichoderma viride (TV), Aspergillus niger (AN) and a hybrid fungi group comprising PC, TV and AN (Hun) were more than 100%. However, compared with the direct effect of citral on mould, the antibacterial property of bamboo treated with citral was significantly reduced, the mildew proof effect can be achieved only if the concentration of citral to treat bamboo is increased to more than twice the concentration of citral directly acting on mould.
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Affiliation(s)
- Jingjing Zhang
- School of Engineering, Zhejiang A&F University, Hangzhou 311300, People's Republic of China
| | - Chungui Du
- School of Engineering, Zhejiang A&F University, Hangzhou 311300, People's Republic of China
| | - Qi Li
- School of Engineering, Zhejiang A&F University, Hangzhou 311300, People's Republic of China
| | - Ailian Hu
- School of Engineering, Zhejiang A&F University, Hangzhou 311300, People's Republic of China
| | - Rui Peng
- School of Engineering, Zhejiang A&F University, Hangzhou 311300, People's Republic of China
| | - Fangli Sun
- School of Engineering, Zhejiang A&F University, Hangzhou 311300, People's Republic of China
| | - Weigang Zhang
- School of Engineering, Zhejiang A&F University, Hangzhou 311300, People's Republic of China
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Motelica L, Popescu A, Răzvan AG, Oprea O, Truşcă RD, Vasile BS, Dumitru F, Holban AM. Facile Use of ZnO Nanopowders to Protect Old Manual Paper Documents. MATERIALS 2020; 13:ma13235452. [PMID: 33266076 PMCID: PMC7730434 DOI: 10.3390/ma13235452] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 11/24/2020] [Accepted: 11/27/2020] [Indexed: 01/23/2023]
Abstract
One of the main problems faced by libraries, archives and collectors is the mold degradation of the paper-based documents, books, artworks etc. Microfungi (molds) emerge in regular storage conditions of such items (humidity, usually over 50%, and temperatures under 21 °C). If the removal of the visible mycelium is relatively easy, there is always the problem of the subsequent appearance of mold as the spores remain trapped in the cellulosic, fibrillary texture, which acts as a net. Moreover, due to improper hand hygiene bacteria contamination, old books could represent a source of biohazard, being colonized with human pathogens. An easy and accessible method of decontamination, which could offer long term protection is therefore needed. Here, we present a facile use of the ZnO nanopowders as antimicrobial agents, suitable for cellulose-based products, conferring an extended antibacterial and anti-microfungal effect. The proposed method does not adversely impact on the quality of the cellulose documents and could be efficiently used for biodegradation protection.
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Affiliation(s)
- Ludmila Motelica
- Faculty of Applied Chemistry and Material Science, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania; (L.M.); (A.-G.R.); (R.-D.T.); (B.-S.V.); (F.D.)
| | - Aurelian Popescu
- Department of Publications Restoration and Preservation, “Carol I” Central University Library, 010292 Bucharest, Romania;
| | - Anca-Gabriela Răzvan
- Faculty of Applied Chemistry and Material Science, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania; (L.M.); (A.-G.R.); (R.-D.T.); (B.-S.V.); (F.D.)
| | - Ovidiu Oprea
- Faculty of Applied Chemistry and Material Science, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania; (L.M.); (A.-G.R.); (R.-D.T.); (B.-S.V.); (F.D.)
- Correspondence: ; Tel.: +40-02-1402-3986
| | - Roxana-Doina Truşcă
- Faculty of Applied Chemistry and Material Science, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania; (L.M.); (A.-G.R.); (R.-D.T.); (B.-S.V.); (F.D.)
| | - Bogdan-Stefan Vasile
- Faculty of Applied Chemistry and Material Science, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania; (L.M.); (A.-G.R.); (R.-D.T.); (B.-S.V.); (F.D.)
| | - Florina Dumitru
- Faculty of Applied Chemistry and Material Science, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania; (L.M.); (A.-G.R.); (R.-D.T.); (B.-S.V.); (F.D.)
| | - Alina-Maria Holban
- Microbiology & Immunology Department, Faculty of Biology, University of Bucharest, 077206 Bucharest, Romania;
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