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Umakoshi T, Urakami T, Kidoguchi H, Yang K, Verma P, Sato H, Higashi M, Tsukamoto I. Raman Spectroscopic and DFT Study of COA-Cl and Its Analogues. J Phys Chem A 2023; 127:1849-1856. [PMID: 36800899 DOI: 10.1021/acs.jpca.2c08382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
COA-Cl is a newly synthesized adenosine analogue that exhibits various physiological activities. Its angiogenic, neurotropic, and neuroprotective potencies make it promising for the development of medicines. In this study, we show Raman spectroscopic study of COA-Cl to elucidate molecular vibrations and related chemical properties. Density functional theory calculations were combined with the Raman spectroscopic data to understand the details of each vibrational mode. Comparative analysis with adenine, adenosine, and other nucleic acid analogues enabled identification of unique Raman peaks originating from the cyclobutane moiety and chloro group of COA-Cl. This study provides fundamental knowledge and crucial insights for further development of COA-Cl and related chemical species.
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Affiliation(s)
- Takayuki Umakoshi
- Institute for Advanced Co-Creation Studies, Osaka University, Suita, Osaka 565-0871, Japan.,Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan.,PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - Takumi Urakami
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Haruki Kidoguchi
- Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
| | - Keishi Yang
- Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
| | - Prabhat Verma
- Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
| | - Hirofumi Sato
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan.,Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto 606-8103, Japan
| | - Masahiro Higashi
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Ikuko Tsukamoto
- Department of Pharmaco-Bio-Informatics, Faculty of Medicine, Kagawa University, Takamatsu, Kagawa 761-0793, Japan
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Nelson P, Adimabua P, Wang A, Zou S, Shah NC. Surface-Enhanced Raman Spectroscopy for Rapid Screening of Cinnamon Essential Oils. APPLIED SPECTROSCOPY 2020; 74:1341-1349. [PMID: 32406267 DOI: 10.1177/0003702820931154] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Cinnamon essential oil is used in food flavoring, food preservation, and for complementary medicine. The most common types of cinnamon used in essential oils are true cinnamon (Cinnamomum verum) and cassia cinnamon (Cinnamomum cassia). True cinnamon is commonly adulterated with cassia cinnamon because it is cheaper. However, cassia cinnamon contains higher concentrations of coumarin which has been shown to have adverse health effects. There is a need to develop simple, nondestructive, rapid screening methods for quality control and food authentication and to identify adulteration of cinnamon essential oil. Currently, the most common methods to screen for coumarin in cinnamon include high-performance liquid chromatography (HPLC) and gas chromatography (GC). However, these methods require time-consuming sample preparation and detection. Vibrational spectroscopy methods are emerging as a promising alternative for rapid, nondestructive screening for food safety applications. In this study, a rapid screening method has been developed to examine cinnamon essential oils using surface-enhanced Raman spectroscopy (SERS). The experimental spectra were compared to theoretical calculations using the DFT method BP86/6-311++G(d,p) basis set. The limit of detection of coumarin was determined to be 1 × 10-6 M or 1.46 mg/L using SERS with colloid paste substrates. Furthermore, 1:16 dilutions of cinnamaldehyde and 1:8 dilutions of eugenol were detected using SERS which can help determine if the cinnamon essential oil was made from bark or from leaves. Seven commercially available cinnamon essential oils were also analyzed and compared to reference solutions. SERS was able to discriminate between essential oils primarily composed of cinnamaldehyde and those composed of eugenol. Furthermore, the SERS method detected peaks that are attributed to coumarin in two of the commercially available samples. To date, this is the first time SERS has been used to rapidly screen cinnamon essential oils.
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Affiliation(s)
- Patrick Nelson
- Chemistry Department, Lake Forest College, Lake Forest, IL, USA
| | | | - Ankai Wang
- Department of Chemistry, University of Central Florida, Orlando, FL, USA
| | - Shengli Zou
- Department of Chemistry, University of Central Florida, Orlando, FL, USA
| | - Nilam C Shah
- Chemistry Department, Lake Forest College, Lake Forest, IL, USA
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