|
1
|
Xia W, Anwar A, Wang L, Cao Z, Li B, Nie K, Zhou C, Zhang Y, Han G, Jiang W, Ben H, Zhao T. Microwave-assisted solid-state pretreatment for fabrication of hemp fibres using ethanolamine at low temperature. Carbohydr Polym 2024; 332:121906. [PMID: 38431392 DOI: 10.1016/j.carbpol.2024.121906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 01/22/2024] [Accepted: 01/31/2024] [Indexed: 03/05/2024]
Abstract
Conventional methods faced challenges in pretreating natural cellulose fibres due to their high energy consumption and large wastewater drainage. This research devised an efficient solid-state pretreatment method for pretreating hemp fibres using ethanolamine (ETA) assisted by microwave (MW) heating. This method produced a notable removal rate of lignin (85.4 %) with the highest cellulose content (83.0 %) at a high solid content (30 %) and low temperature (70 °C). Both FT-IR and XRD analyses indicated that the pretreatment did not alter the structure of cellulose within the hemp fibres but increased crystallinity as the CrI increased from 84 % in raw hemp fibre to 89 % in pretreated fibre. As a result, it produced hemp fibres with impressive fineness (4.6 dtex) and breaking strength (3.81 cN/dtex), meeting the requirement of textile fibre. In addition, an improvement in glucose concentration (15.6 %) was observed in enzymatic hydrolysis of the MW pretreated hemp fibres compared to the fibres pretreated without MW. Furthermore, the FT-IR and NMR data confirmed that the amination of lignin occurred even at low temperature, which contributed to the high lignin removal rate. Thus, this study presents a potentially effective energy-saving, and environmentally sustainable solid-state method for pretreating hemp fibres.
Collapse
Affiliation(s)
- Wenying Xia
- College of Textiles and Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao 266000, Shandong, China
| | - Almas Anwar
- College of Textiles and Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao 266000, Shandong, China
| | - Lingyu Wang
- College of Textiles and Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao 266000, Shandong, China
| | - Zhihao Cao
- College of Textiles and Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao 266000, Shandong, China
| | - Boya Li
- College of Textiles and Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao 266000, Shandong, China
| | - Kai Nie
- College of Textiles and Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao 266000, Shandong, China; College of Textile, Donghua University, Shanghai 201620, China
| | - Chengfeng Zhou
- College of Textiles and Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao 266000, Shandong, China
| | - Yuanming Zhang
- College of Textiles and Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao 266000, Shandong, China
| | - Guangting Han
- College of Textiles and Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao 266000, Shandong, China
| | - Wei Jiang
- College of Textiles and Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao 266000, Shandong, China
| | - Haoxi Ben
- College of Textiles and Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao 266000, Shandong, China.
| | - Tao Zhao
- College of Textiles and Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao 266000, Shandong, China.
| |
Collapse
|
|
2
|
Abstract
C-N coupling reactions were found to be attractive among researchers owing to
the importance of C-N bond formation in heterocyclic synthesis. Hence C-N bond formation
via amination reaction with the assistance of microwave radiations gained significant
attraction recently. Microwave-assisted reactions are greener, faster and generally efficient
compared to the conventional thermal reactions offering better purity of the product with
enhancement in the yield. It was surprisingly revealed that several new advancements in
amination reactions were highly influenced by this greener technology. This first review on
microwave-assisted amination reaction focuses on the novel amination strategies that
emerged with the help of microwave methodology, and covers literature up to 2019.
Collapse
Affiliation(s)
- Sankaran Radhika
- School of Chemical Sciences, Mahatma Gandhi University, Priyadarsini Hills P.O., Kottayam, Kerala, 686560, India
| | - Mohan Neetha
- School of Chemical Sciences, Mahatma Gandhi University, Priyadarsini Hills P.O., Kottayam, Kerala, 686560, India
| | - Thaipparambil Aneeja
- School of Chemical Sciences, Mahatma Gandhi University, Priyadarsini Hills P.O., Kottayam, Kerala, 686560, India
| | - Gopinathan Anilkumar
- School of Chemical Sciences, Mahatma Gandhi University, Priyadarsini Hills P.O., Kottayam, Kerala, 686560, India
| |
Collapse
|
|
3
|
Balkenhohl M, Valsamidou V, Knochel P. Amination of 2‐Pyridinesulfonic and 8‐Quinolinesulfonic Acids with Magnesium Amides. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900057] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Moritz Balkenhohl
- Department Chemie Ludwig‐Maximilians‐Universität München Butenandtstrasse 5‐13, Haus F 81377 München Germany
| | - Vasiliki Valsamidou
- Department Chemie Ludwig‐Maximilians‐Universität München Butenandtstrasse 5‐13, Haus F 81377 München Germany
| | - Paul Knochel
- Department Chemie Ludwig‐Maximilians‐Universität München Butenandtstrasse 5‐13, Haus F 81377 München Germany
| |
Collapse
|
|
4
|
Balkenhohl M, Heinz B, Abegg T, Knochel P. Amination of Phosphorodiamidate-Substituted Pyridines and Related N-Heterocycles with Magnesium Amides. Org Lett 2018; 20:8057-8060. [PMID: 30511876 DOI: 10.1021/acs.orglett.8b03698] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The amination of various phosphorodiamidate-substituted pyridines, quinolines, and quinoxaline with magnesium amides R2NMgCl·LiCl proceeds at room temperature within 8 h. Several pharmaceutically active amines were suitable substrates for this amination procedure, and also the antihistaminic tripelennamine was prepared. Additionally, several heterocyclic phosphorodiamidates underwent directed ortho-metalation (D oM) using TMPMgCl·LiCl (TMP = 2,2,6,6-tetramethylpiperidyl) or TMP2Mg·2LiCl, followed by electrophilic functionalization prior to the amination step, which led to ortho-functionalized aminated N-heterocycles.
Collapse
Affiliation(s)
- Moritz Balkenhohl
- Department of Chemistry , Ludwig-Maximilians-Universität München , Butenandtstr. 5-13, Haus F , 81377 Munich , Germany
| | - Benjamin Heinz
- Department of Chemistry , Ludwig-Maximilians-Universität München , Butenandtstr. 5-13, Haus F , 81377 Munich , Germany
| | - Thomas Abegg
- Department of Chemistry , Ludwig-Maximilians-Universität München , Butenandtstr. 5-13, Haus F , 81377 Munich , Germany
| | - Paul Knochel
- Department of Chemistry , Ludwig-Maximilians-Universität München , Butenandtstr. 5-13, Haus F , 81377 Munich , Germany
| |
Collapse
|
|
5
|
Sapegin AV, Kalinin SA, Smirnov AV, Dorogov MV, Krasavin M. Efficient Use of 1,2-Dihaloazine Synthons in Transition-Metal-Free Preparation of Diverse Heterocycle-Fused 1,4-Oxazepines. European J Org Chem 2015. [DOI: 10.1002/ejoc.201403397] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|