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Gu S, Luo W, Charmchi A, McWhirter KJ, Rosenstiel T, Pankow J, Faiola CL. Limonene Enantiomeric Ratios from Anthropogenic and Biogenic Emission Sources. ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS 2024; 11:130-135. [PMID: 38371653 PMCID: PMC10867824 DOI: 10.1021/acs.estlett.3c00794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 01/26/2024] [Accepted: 01/31/2024] [Indexed: 02/20/2024]
Abstract
Emissions from volatile chemical products (VCPs) have been identified as contributors to air quality degradation in urban areas. Limonene can be a tracer compound for VCPs containing fragrances in densely populated regions, but limonene is also emitted from conifers that are planted in urban areas. This creates challenges for using limonene to estimate VCP emissions. In this study, the -/+ enantiomeric ratios of limonene from VCP and conifer emission sources were quantified to evaluate if this measurement could be used to aid in source apportionment and emission inventory development. Samples were analyzed using a gas chromatograph equipped with a chiral column and mass spectrometry. The results demonstrate that limonene exhibits distinct enantiomeric ratios when sourced from VCPs versus conifers. (+)-Limonene was dominant in VCP sources (>97%), which was not universally true for conifer sources. The results were compared to those of air samples collected outside at two locations and indoors. The levels of (-)-limonene in outdoor air in Irvine and Portland and in indoor air were 50%, 22%, and 4%, respectively. This suggests outdoor limonene had both VCP and plant emission sources while indoor air was dominated by VCP sources. This study demonstrates the potential utility of enantiomeric analysis for improving VCP emission estimates in urban areas.
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Affiliation(s)
- Shan Gu
- Ecology
and Evolutionary Biology, University of
California Irvine, Irvine, California 92697, United States
| | - Wentai Luo
- Civil
and Environmental Engineering, Portland
State University, Portland, Oregon 97201, United States
| | - Avisa Charmchi
- Ecology
and Evolutionary Biology, University of
California Irvine, Irvine, California 92697, United States
- Chemistry, University
of California Irvine, Irvine, California 92697, United States
| | - Kevin J. McWhirter
- Civil
and Environmental Engineering, Portland
State University, Portland, Oregon 97201, United States
| | - Todd Rosenstiel
- Biology, Portland State University, Portland, Oregon 97201, United States
| | - James Pankow
- Civil
and Environmental Engineering, Portland
State University, Portland, Oregon 97201, United States
| | - Celia L. Faiola
- Ecology
and Evolutionary Biology, University of
California Irvine, Irvine, California 92697, United States
- Chemistry, University
of California Irvine, Irvine, California 92697, United States
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Tian B, Gao S, Zhu Z, Zeng X, Liang Y, Yu Z, Peng P. Two-dimensional gas chromatography coupled to isotope ratio mass spectrometry for determining high molecular weight polycyclic aromatic hydrocarbons in sediments. J Chromatogr A 2023; 1693:463879. [PMID: 36822039 DOI: 10.1016/j.chroma.2023.463879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 02/12/2023] [Accepted: 02/16/2023] [Indexed: 02/21/2023]
Abstract
The accuracy of compound-specific isotope analysis (CSIA) of trace-level pollutants in complex environmental samples has always been limited by two main challenges: poor chromatographic separation and insufficient amounts of analytes. In this study, a two-dimensional gas chromatography-isotope ratio mass spectrometry (2DGC-IRMS) system was constructed for compound-specific δ13C analysis of high molecular weight polycyclic aromatic hydrocarbons (HMW-PAHs) in estuarine/marine sediments. This construction occurred through hyphenating an extra gas chromatography system (GC) to a conventional GC-IRMS using a commercially available multi-column switching-cryogenic trapping system (MCS-CTS). Compared with the previous 2DGC-IRMS strategy, which utilizes a Deans Switch device, the newly implemented 2DGC-IRMS scheme resulted in online purification of target analytes as well as enriched them online via duplicate injection and cryogenic trapping in CTS; this resultingly lowered the limits of detection (LOD) of CSIA. To improve the sample transfer efficiency to the IRMS, a broader-bore and longer fused-silica capillary was utilized to replace the original sample capillary running from the sample open split to the IRMS. A ẟ13C analysis of PAH standards showed accurate ẟ13C values, and high precisions (standard deviations 0.13-0.37%) were achieved, with the LOD of HMW-PAHs reduced to at least 1.0 mg/L (i.e., 0.07 to 0.09 nmol carbon per compound on-column). The successful application of this newly developed 2DGC-IRMS scheme provides a practical solution for the reliable CSIA of trace-level pollutants in complex environmental samples that cannot be measured using the conventional GC-IRMS system.
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Affiliation(s)
- Boyang Tian
- State Key Laboratory of Organic Geochemistry, Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shutao Gao
- State Key Laboratory of Organic Geochemistry, Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; CAS Center for Excellence in Deep Earth Science, Guangzhou, 510640, China.
| | - Zhanjun Zhu
- State Key Laboratory of Organic Geochemistry, Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiangying Zeng
- State Key Laboratory of Organic Geochemistry, Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; CAS Center for Excellence in Deep Earth Science, Guangzhou, 510640, China
| | - Yi Liang
- State Key Laboratory of Organic Geochemistry, Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; CAS Center for Excellence in Deep Earth Science, Guangzhou, 510640, China
| | - Zhiqiang Yu
- State Key Laboratory of Organic Geochemistry, Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; CAS Center for Excellence in Deep Earth Science, Guangzhou, 510640, China
| | - Ping'an Peng
- State Key Laboratory of Organic Geochemistry, Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; CAS Center for Excellence in Deep Earth Science, Guangzhou, 510640, China
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Feng D, Wang D, Wang D, Zhong Q, Li G, Zhang L, Chen N, Lin X, Miao S. Stable isotope ratio analysis of carbon to distinguish sialic acid from freshly stewed bird's nest products. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2022; 14:4386-4392. [PMID: 36281988 DOI: 10.1039/d2ay01152b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Freshly stewed bird's nest products are easily adulterated with exogenous synthetic sialic acid to enhance the grade of the products and sell at high prices. This paper identifies the carbon stable isotope characteristics of sialic acid from natural and commercially synthetic sources using stable isotope ratio mass spectrometry (IRMS). Specifically, an off-line pretreatment technique combined with on-line LC-IRMS was developed to accurately determine δ13C values of sialic acid in a freshly stewed bird's nest. This method has no obvious isotope fractionation and good reproducibility. EA-IRMS was used to determine the δ13C values of commercial sialic acid. The results showed that the δ13C values of sialic acid from natural and synthetic sources were -29.90% ± 0.42% and -16.26% ± 3.91%, respectively, with distinct carbon stable isotope distribution characteristics. By defining a δ13C threshold value of -28.54% for natural SA, additional commercial SA from a minimum of 10% can be identified. Therefore, δ13C was proposed as a suitable tool for verifying the authenticity of fresh stewed bird's nests on the market.
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Affiliation(s)
- Di Feng
- Technology Innovation Center of Light Industrial Consumer Goods Quality and Safety, Beijing 100015, China.
- Sinolight Technology Innovation Center Co. Ltd, Beijing 100015, China
- China National Research Institute of Food and Fermentation Industries, Beijing 100015, China
| | - Daobing Wang
- Technology Innovation Center of Light Industrial Consumer Goods Quality and Safety, Beijing 100015, China.
- Sinolight Technology Innovation Center Co. Ltd, Beijing 100015, China
| | - Dongliang Wang
- Beijing Xiaoxiandun Biotechnology Co., Ltd., Beijing 100020, China
- Hebei Edible Bird's Nest Fresh Stew Technology Innovation Center, Langfang 065700, China
| | - Qiding Zhong
- Technology Innovation Center of Light Industrial Consumer Goods Quality and Safety, Beijing 100015, China.
- Sinolight Technology Innovation Center Co. Ltd, Beijing 100015, China
- China National Research Institute of Food and Fermentation Industries, Beijing 100015, China
- Sinolight Inspection & Certification Co., Ltd., Beijing 100016, China
| | - Guohui Li
- Technology Innovation Center of Light Industrial Consumer Goods Quality and Safety, Beijing 100015, China.
- Sinolight Technology Innovation Center Co. Ltd, Beijing 100015, China
| | - Luoqi Zhang
- Technology Innovation Center of Light Industrial Consumer Goods Quality and Safety, Beijing 100015, China.
- Sinolight Technology Innovation Center Co. Ltd, Beijing 100015, China
| | - Nannan Chen
- Food Industry Promotion Center, Beijing 100015, China
| | - Xiaoxian Lin
- Beijing Xiaoxiandun Biotechnology Co., Ltd., Beijing 100020, China
- Hebei Edible Bird's Nest Fresh Stew Technology Innovation Center, Langfang 065700, China
| | - Shu Miao
- Beijing Xiaoxiandun Biotechnology Co., Ltd., Beijing 100020, China
- Hebei Edible Bird's Nest Fresh Stew Technology Innovation Center, Langfang 065700, China
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Isotopic Characterization of Italian Industrial Hemp (Cannabis sativa L.) Intended for Food Use: A First Exploratory Study. SEPARATIONS 2022. [DOI: 10.3390/separations9060136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
In this study, Italian industrial hemp (Cannabis sativa L.) intended for food use was isotopically characterized for the first time. The stable isotope ratios of five bioelements were analyzed in different parts of the plant (i.e., roots, stems, inflorescences, and seeds) sampled in eight different regions of Italy, and in five hemp seed oils. The values of δ2H, δ13C, δ18O, and δ34S differed according to the latitude and, therefore, to the geographical origin of the samples and the climate conditions of plant growth, while the δ15N values allowed us to distinguish between crops grown under conventional and organic fertilization. The findings from this preliminary study corroborate the reliability of using light stable isotope ratios to characterize hemp and its derived food products and contribute to the creation of a first isotopic database for this plant, paving the way for future studies on authentication, traceability, and verification of organic labeling.
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