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Huang X, Guo H, Xie Q, Jin W, Zeng R, Hong Z, Zhang Y, Zhang Y. Preparation and Embedding Characterization of Hydroxypropyl-β-cyclodextrin/Menthyl Acetate Microcapsules with Enhanced Stability. Pharmaceutics 2023; 15:1979. [PMID: 37514165 PMCID: PMC10383387 DOI: 10.3390/pharmaceutics15071979] [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: 06/10/2023] [Revised: 07/10/2023] [Accepted: 07/17/2023] [Indexed: 07/30/2023] Open
Abstract
OBJECTIVE Hydroxypropyl-β-cyclodextrin (HP-β-CD)/menthyl acetate (MA) microcapsules were developed to overcome the volatile and unstable defects of MA and improve the ease of use and storage. METHODS MA microcapsules were prepared via spray drying using HP-β-CD as the wall material. The embedding rate of MA microcapsules was determined through gas chromatography. The embedding characteristics were studied using phase solubility and nuclear magnetic resonance (NMR). The stability was characterized via differential scanning calorimetry (DSC) and the release and retention rates of MA microcapsules at different temperatures. RESULTS The embedding rate of HP-β-CD /MA microcapsules was 96.3%. The Gibbs free energy change, enthalpy change and entropy change of the embedding reaction between HP-β-CD and MA were all less than zero, indicating that the embedding process was a spontaneous exothermic reaction. NMR spectra showed that MA entered the cavity of HP-β-CD through the large opening end and interacted with the inner wall of the small opening end. DSC and the release and retention rates of MA microcapsules at different temperatures showed that the stability of MA was significantly enhanced after being embedded in HP-β-CD. CONCLUSION The HP-β-CD/MA microcapsules are able to significantly improve the stability of MA and reduce the volatilization of MA.
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Affiliation(s)
- Xiaoqing Huang
- College of Marine Food and Biological Engineering, Jimei University, Xiamen 361021, China
- Engineering Technology Innovation Center for the Development and Utilization of Marine Living Resources, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Honghui Guo
- Engineering Technology Innovation Center for the Development and Utilization of Marine Living Resources, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
- Department of Marine Biology, Xiamen Ocean Vocational College, Xiamen 361100, China
- Fujian Provincial Key Laboratory of Island Conservation and Development (Island Research Center, MNR), Pingtan 350400, China
| | - Quanling Xie
- Engineering Technology Innovation Center for the Development and Utilization of Marine Living Resources, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
- Department of Marine Biology, Xiamen Ocean Vocational College, Xiamen 361100, China
- Fujian Provincial Key Laboratory of Island Conservation and Development (Island Research Center, MNR), Pingtan 350400, China
| | - Wenhui Jin
- Engineering Technology Innovation Center for the Development and Utilization of Marine Living Resources, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
- Department of Marine Biology, Xiamen Ocean Vocational College, Xiamen 361100, China
- Fujian Provincial Key Laboratory of Island Conservation and Development (Island Research Center, MNR), Pingtan 350400, China
| | - Runying Zeng
- Engineering Technology Innovation Center for the Development and Utilization of Marine Living Resources, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
- Fujian Provincial Key Laboratory of Island Conservation and Development (Island Research Center, MNR), Pingtan 350400, China
| | - Zhuan Hong
- Engineering Technology Innovation Center for the Development and Utilization of Marine Living Resources, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
- Department of Marine Biology, Xiamen Ocean Vocational College, Xiamen 361100, China
- Fujian Provincial Key Laboratory of Island Conservation and Development (Island Research Center, MNR), Pingtan 350400, China
| | - Yiping Zhang
- Engineering Technology Innovation Center for the Development and Utilization of Marine Living Resources, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
- Department of Marine Biology, Xiamen Ocean Vocational College, Xiamen 361100, China
- Fujian Provincial Key Laboratory of Island Conservation and Development (Island Research Center, MNR), Pingtan 350400, China
| | - Yucang Zhang
- College of Marine Food and Biological Engineering, Jimei University, Xiamen 361021, China
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A Scent of Peppermint—A Microwave Spectroscopy Analysis on the Composition of Peppermint Oil. Symmetry (Basel) 2022. [DOI: 10.3390/sym14061262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Essential oils have a vast number of applications in different areas of our daily life. Detailed chiral analysis and structural characterization of their constituents remains an important subject in analytical chemistry. Here, we report on a broadband rotational spectroscopy study of peppermint oil in the frequency range 2–8 GHz. We focus on an unambiguous determination of the excess enantiomers of the oil constituents menthone and isomenthone in the oil by applying chirality-sensitive rotational spectroscopy, the so-called microwave three-wave mixing (M3WM) technique. Additionally, a new menthol conformer, not previously characterized, was experimentally observed, and the gas-phase structures of the two conformers of menthol and menthone were determined experimentally based on the assignment of their 13C-isotopologues in natural abundance.
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