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Hurlburt B, Lloyd SW, Grimm CC. Comparison of Analytical Techniques for Detection of Geosmin and 2-Methylisoborneol in Aqueous Samples. J Chromatogr Sci 2009; 47:670-3. [DOI: 10.1093/chromsci/47.8.670] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Affiliation(s)
- J. T. Manful
- Food Research Institute (CSIR), P.O. Box M.20, Accra, Ghana
| | - C. C. Grimm
- USDA-ARS Southern Regional Research Center, 1100 Robert E. Lee Blvd., New Orleans, LA 70124
- Corresponding author. E-mail:
| | - J. Gayin
- Food Research Institute (CSIR), P.O. Box M.20, Accra, Ghana
| | - R. D. Coker
- Food Management and Marketing Group, Natural Resources Institute University of Greenwich at Medway Chatham Maritime; Kent, ME4 4TB, England
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Bett-Garber KL, Champagne ET, Ingram DA, Grimm CC. Impact of Iron Source and Concentration on Rice Flavor Using a Simulated Rice Kernel Micronutrient Delivery System. Cereal Chem 2004. [DOI: 10.1094/cchem.2004.81.3.384] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- K. L. Bett-Garber
- SRRC, ARS, USDA, New Orleans, LA 70124. Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by the USDA implies no approval of the product to the exclusion of others that may also be suitable
- Corresponding author. Phone: 504-286-4459. E-mail:
| | - E. T. Champagne
- SRRC, ARS, USDA, New Orleans, LA 70124. Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by the USDA implies no approval of the product to the exclusion of others that may also be suitable
| | - D. A. Ingram
- SRRC, ARS, USDA, New Orleans, LA 70124. Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by the USDA implies no approval of the product to the exclusion of others that may also be suitable
| | - C. C. Grimm
- SRRC, ARS, USDA, New Orleans, LA 70124. Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by the USDA implies no approval of the product to the exclusion of others that may also be suitable
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Beaulieu JC, Grimm CC. Identification of volatile compounds in cantaloupe at various developmental stages using solid phase microextraction. J Agric Food Chem 2001; 49:1345-52. [PMID: 11312862 DOI: 10.1021/jf0005768] [Citation(s) in RCA: 135] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Using an automated rapid headspace solid phase microextraction (SPME) method for volatile extraction in cantaloupes, 86 compounds already reported for muskmelons were recovered and an additional 53 compounds not previously reported were identified or tentatively identified. The SPME method extracted a copious number of volatiles that can be analyzed to clearly differentiate between variety, growth stage, and stage of harvest ripeness. Most of the newly reported compounds in cantaloupe were esters and aldehydes that have already been demonstrated as flavor-related compounds in other products. All esters believed to have flavor impact increased progressively after pollination, and this trend continued with increasing harvest maturity. However, compound recovery often decreased when fruits were harvested over-ripe. Most aldehydes increased during early growth stages and then tapered off with increasing harvest maturity. The SPME method suitably recovered most compounds reported to impart characteristic flavor/aroma in muskmelons. SPME offers experimental flexibility and the ability to discover more compounds and address flavor quality changes in fresh-cut cantaloupe.
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Affiliation(s)
- J C Beaulieu
- Southern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, 1100 Robert E. Lee Boulevard, New Orleans, LA 70124, USA.
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Abstract
Solid phase microextraction (SPME) is used to collect and concentrate the compounds in the headspace of rice. This research describes optimization parameters of temperature, moisture, and sampling time. Optimization was based upon the recovered levels of 2-acetyl-1-pyrroline (2-AP), the popcorn aroma in aromatic rice. The method uses a sampling temperature of 80 degrees C and adds 100 microL of water to a 0.75 g sample of rice. The rice was preheated for 25 min, a carboxen/DVB/PDMS SPME fiber was exposed to the headspace for 15 min, and a subsequent GC-MS analysis took 35 min. Samples of rice can be analyzed as the flour, milled kernels, or brown rice. Twenty-one experimental rice varieties were analyzed by the SPME method and compared to a wet technique. Recoveries of several nanograms of 2-AP from 0.75 g samples of aromatic rice were observed, whereas only trace amounts of 2-AP were recovered from nonaromatic rice. Recovery from a single SPME headspace analysis is calculated to be 0.3% of the total 2-AP in the sample.
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Affiliation(s)
- C C Grimm
- Southern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, 1100 Robert E. Lee Boulevard, New Orleans, Louisiana 70124, USA
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Grimm CC, Lloyd SW, Batista R, Zimba PV. Using microwave distillation-solid-phase microextraction--gas chromatography--mass spectrometry for analyzing fish tissue. J Chromatogr Sci 2000; 38:289-96. [PMID: 10901414 DOI: 10.1093/chromsci/38.7.289] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
A technique for the analysis of the volatile compounds from fish tissue employing microwave distillation-solid-phase microextraction-gas chromatography-mass spectrometry is described. A qualitative listing of 174 compounds observed in the headspace is given, and a quantitative method for the determination of the off-flavor contaminants (2-methylisoborneol and geosmin) is presented. Borneol and decahydro-1-naphthol are used as the surrogate and internal standards, respectively. A linear calibration curve is obtained for 0.1 to 5 ppb with a recovery level of 60% at 2.5 ppb. Comparison of the instrumental method with a human flavor checker showed good agreement.
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Affiliation(s)
- C C Grimm
- USDA-ARS-SRRC, New Orleans, LA 70124, USA.
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Lloyd SW, Grimm CC. Analysis of 2-methylisoborneol and geosmin in catfish by microwave distillation--solid-phase microextraction. J Agric Food Chem 1999; 47:164-169. [PMID: 10563866 DOI: 10.1021/jf980419x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The semivolatile cyclic alcohols 2-methylisoborneol (MIB) and geosmin (GSM) impart muddy or musty flavors to water and food products. A rapid quantitative analytical technique has been developed whereby microwave distillation is used to remove the volatile organic compounds from a lipophilic matrix into an aqueous matrix. Solid-phase microextraction (MD-SPME) is then used to extract and concentrate the analytes, which are then desorbed in the injection port of a gas chromatograph/mass spectrometer (GC/MS) for analysis. Limits of detection are 0.01 microg/kg and limits of quantification are 0.1 microg/kg. MD-SPME is comparable in precision, requires no solvents, and is faster than current methods of analysis. This methodology allows detection of MIB and GSM at concentrations below human sensory thresholds in fish tissue.
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Affiliation(s)
- S W Lloyd
- Southern Regional Research Center, Agricultural Research Service, U. S. Department of Agriculture, 1100 Robert E. Lee Boulevard, New Orleans, Louisiana 70124, USA.
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Abstract
A triple-quadrupole mass spectrometer has been interfaced with a wide-angle secondary ion microprobe. The combination permits acquisition of data necessary to determine the distribution of targeted organic analytes even in the presence of overwhelming isobaric interference. Micrographs generated from secondary ion intensity alone are compared to those generated using secondary ionization with tandem mass spectrometry (MS/MS), both for image reference and to show the improvement in image quality that can be attained when MS/MS is employed. Inhomogeneous mixtures of glycerol, KCl, and asparagine on 1-cm-diameter aluminum targets were used to demonstrate the instrument's selectivity. Secondary ions generated from samples of this system include isobaric 133Cs+ implanted from the primary ion beam, the 41K(+)-glycerol adduct, and protonated asparagine.
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Affiliation(s)
- P J Todd
- Analytical Chemistry Division, Oak Ridge National Laboratory, Tennessee 37831-6365
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Grimm CC, Short RT, Todd PJ. A wide-angle secondary ion probe for organic ion imaging. J Am Soc Mass Spectrom 1991; 2:362-371. [PMID: 24242687 DOI: 10.1016/1044-0305(91)85002-n] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/1990] [Accepted: 02/20/1991] [Indexed: 06/02/2023]
Abstract
A secondary ion source has been developed for an organic ion microprobe capable of imaging samples up to 2 em in diameter. The source uses a focused 5 keY Cs(+) ion beam which is rastered across the sample surface, and secondary ions from each point on the sample are collected and formed into a low energy beam to be analyzed by a quadrupole mass filter. Dynamic emittance matching is employed to deflect ions from off-axis points on the sample back onto the mass analyzer axis. Rastering and dynamic emittance matching are rapidly controlled by assembly language programs using an IBM/AT (80286) type computer. A low energy ion monitor was used to tune and evaluate the secondary ion source by providing a magnified cross-sectional image of the ion beam at the source exit aperture. A well-focused and centered secondary ion beam was obtained from each point on the sample, indicating that large-scale dynamic emittance matching with high collection efficiency is possible. Mass resolved images of grids and glycerol samples are shown to demonstrate the performance of the integrated secondary ion source mass analyzer and control system.
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Affiliation(s)
- C C Grimm
- Oak Ridge National Laboratory, 37831-6365, Oak Ridge, Tennessee, USA
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Short RT, Grimm CC, Todd PJ. Monitor for displaying real-time images of low energy ion beams. J Am Soc Mass Spectrom 1991; 2:226-231. [PMID: 24242277 DOI: 10.1016/1044-0305(91)80048-c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/1990] [Accepted: 12/18/1990] [Indexed: 06/02/2023]
Abstract
Analytical Chemistry Division. Oak Ridge National Laboratory. Oak Ridge, Tennessee, USA A monitor that provides real-time images of low energy (< 50 eV) ion beams has been designed, constructed, and tested. The cross-sectional image of the beam at the entrance aperture of the monitor is magnified by a factor of 6.5 and displayed on a CRT, following current amplification by using a dual microchannel plate assembly. The monitor provides unambiguous information regarding the cross section of any low energy ion beam. Anplication in the design and testing of quadrupole-based mass spectrometers is emphasized.
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Affiliation(s)
- R T Short
- Analytical Chemistry Division, Oak Ridge National Laboratory, 37830-6365, Oak Ridge, TN
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Arbogast B, Budde WL, Deinzer M, Dougherty RC, Eichelberger J, Foltz RD, Grimm CC, Hites RA, Sakashita C, Stemmler E. Interlaboratory comparison of limits of detectic in negative chemical ionization mass spectrometry. ACTA ACUST UNITED AC 1990. [DOI: 10.1002/oms.1210250403] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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