Thermal stability of levopimaric acid and its oxidation products
Abstract Biofuels are renewable alternatives to fossil fuels. Levopimaric acid‒base biofuels have attracted increasing attention. However, their stability remains a critical issue in practice. Thus, there is a strong impetus to evaluate the thermal stability of levopimaric acid. Through thermogravim...
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| Format: | Article |
| Language: | English |
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BMC
2023-09-01
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| Series: | BMC Chemistry |
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| Online Access: | https://doi.org/10.1186/s13065-023-01031-z |
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| author | Yuanlin Li Hongqin Chen Heng Yan Yangyong Xu Jinwen Tang Runsen Wang Mengru Yan Yuqiao Dai Yongguang Huang Xiongmin Liu |
| author_facet | Yuanlin Li Hongqin Chen Heng Yan Yangyong Xu Jinwen Tang Runsen Wang Mengru Yan Yuqiao Dai Yongguang Huang Xiongmin Liu |
| author_sort | Yuanlin Li |
| collection | DOAJ |
| description | Abstract Biofuels are renewable alternatives to fossil fuels. Levopimaric acid‒base biofuels have attracted increasing attention. However, their stability remains a critical issue in practice. Thus, there is a strong impetus to evaluate the thermal stability of levopimaric acid. Through thermogravimetry (TG) and a custom-designed mini closed pressure vessel test (MCPVT) operating under isothermal and stepped temperature conditions, we investigated thermal oxidation characteristics of levopimaric acid under oxygen atmosphere. Thin-layer chromatography (TLC) and iodimetry were used to measure the hydrogen peroxides generated by levopimaric acid oxidation. A high pressure differential scanning calorimeter (HPDSC) was used to assess hydroperoxide thermal decomposition characteristics. Gas chromatography-mass spectrometry (GC-MS) was used to characterize the oxidation products. The thermal decomposition kinetics of levopimaric acid were thus elucidated, and a high peroxide value was detected in the levopimaric acid. The decomposition heat (QDSC) and exothermic onset temperature (Tonset) of hydroperoxides were 338.75 J g−1 and 375.37 K, respectively. Finally, levopimaric acid underwent a second-stage oxidation process at its melt point (423.15 K), resulting in complex oxidation products. Thermal oxidation of levopimaric acid could yield potential thermal hazards, indicating that antioxidants must be added during levopimaric acid application to protect against such hazardous effects. |
| first_indexed | 2024-03-09T15:31:32Z |
| format | Article |
| id | doaj.art-bd81937e2ac8410185fb098d6400d8d9 |
| institution | Directory Open Access Journal |
| issn | 2661-801X |
| language | English |
| last_indexed | 2024-03-09T15:31:32Z |
| publishDate | 2023-09-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Chemistry |
| spelling | doaj.art-bd81937e2ac8410185fb098d6400d8d92023-11-26T12:13:57ZengBMCBMC Chemistry2661-801X2023-09-0117111310.1186/s13065-023-01031-zThermal stability of levopimaric acid and its oxidation productsYuanlin Li0Hongqin Chen1Heng Yan2Yangyong Xu3Jinwen Tang4Runsen Wang5Mengru Yan6Yuqiao Dai7Yongguang Huang8Xiongmin Liu9College of Liquor and Food Engineering, Key Laboratory of Fermentation Engineering and Biological Pharmacy of Guizhou Province, Guizhou UniversityCollege of Liquor and Food Engineering, Key Laboratory of Fermentation Engineering and Biological Pharmacy of Guizhou Province, Guizhou UniversityCollege of Liquor and Food Engineering, Key Laboratory of Fermentation Engineering and Biological Pharmacy of Guizhou Province, Guizhou UniversityCollege of Liquor and Food Engineering, Key Laboratory of Fermentation Engineering and Biological Pharmacy of Guizhou Province, Guizhou UniversityCollege of Liquor and Food Engineering, Key Laboratory of Fermentation Engineering and Biological Pharmacy of Guizhou Province, Guizhou UniversityCollege of Liquor and Food Engineering, Key Laboratory of Fermentation Engineering and Biological Pharmacy of Guizhou Province, Guizhou UniversityCollege of Liquor and Food Engineering, Key Laboratory of Fermentation Engineering and Biological Pharmacy of Guizhou Province, Guizhou UniversityGuizhou Tea Research InstituteCollege of Liquor and Food Engineering, Key Laboratory of Fermentation Engineering and Biological Pharmacy of Guizhou Province, Guizhou UniversityCollege of Chemistry and Chemical Engineering, Guangxi UniversityAbstract Biofuels are renewable alternatives to fossil fuels. Levopimaric acid‒base biofuels have attracted increasing attention. However, their stability remains a critical issue in practice. Thus, there is a strong impetus to evaluate the thermal stability of levopimaric acid. Through thermogravimetry (TG) and a custom-designed mini closed pressure vessel test (MCPVT) operating under isothermal and stepped temperature conditions, we investigated thermal oxidation characteristics of levopimaric acid under oxygen atmosphere. Thin-layer chromatography (TLC) and iodimetry were used to measure the hydrogen peroxides generated by levopimaric acid oxidation. A high pressure differential scanning calorimeter (HPDSC) was used to assess hydroperoxide thermal decomposition characteristics. Gas chromatography-mass spectrometry (GC-MS) was used to characterize the oxidation products. The thermal decomposition kinetics of levopimaric acid were thus elucidated, and a high peroxide value was detected in the levopimaric acid. The decomposition heat (QDSC) and exothermic onset temperature (Tonset) of hydroperoxides were 338.75 J g−1 and 375.37 K, respectively. Finally, levopimaric acid underwent a second-stage oxidation process at its melt point (423.15 K), resulting in complex oxidation products. Thermal oxidation of levopimaric acid could yield potential thermal hazards, indicating that antioxidants must be added during levopimaric acid application to protect against such hazardous effects.https://doi.org/10.1186/s13065-023-01031-zReaction progressThermal decompositionOxidation characteristicsThermal oxidationPeroxide value |
| spellingShingle | Yuanlin Li Hongqin Chen Heng Yan Yangyong Xu Jinwen Tang Runsen Wang Mengru Yan Yuqiao Dai Yongguang Huang Xiongmin Liu Thermal stability of levopimaric acid and its oxidation products BMC Chemistry Reaction progress Thermal decomposition Oxidation characteristics Thermal oxidation Peroxide value |
| title | Thermal stability of levopimaric acid and its oxidation products |
| title_full | Thermal stability of levopimaric acid and its oxidation products |
| title_fullStr | Thermal stability of levopimaric acid and its oxidation products |
| title_full_unstemmed | Thermal stability of levopimaric acid and its oxidation products |
| title_short | Thermal stability of levopimaric acid and its oxidation products |
| title_sort | thermal stability of levopimaric acid and its oxidation products |
| topic | Reaction progress Thermal decomposition Oxidation characteristics Thermal oxidation Peroxide value |
| url | https://doi.org/10.1186/s13065-023-01031-z |
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