Evaporative Light-Scattering Analysis of Sulforaphane in Broccoli Samples:  Quality of Broccoli Products Regarding Sulforaphane Contents

Broccoli sulforaphane has received attention as a possible anticarcinogen. Sulforaphane analysis is difficult due to the lack of a chromophore for spectrometric detection. Hence, we developed a method for determining sulforaphane by using high-performance liquid chromatography (HPLC) coupled with an...

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Published in:Journal of agricultural and food chemistry Vol. 54; no. 7; pp. 2479 - 2483
Main Authors: Nakagawa, Kiyotaka, Umeda, Toshiko, Higuchi, Ohki, Tsuzuki, Tsuyoshi, Suzuki, Toshihide, Miyazawa, Teruo
Format: Journal Article
Language:English
Published: Washington, DC American Chemical Society 05-04-2006
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Abstract Broccoli sulforaphane has received attention as a possible anticarcinogen. Sulforaphane analysis is difficult due to the lack of a chromophore for spectrometric detection. Hence, we developed a method for determining sulforaphane by using high-performance liquid chromatography (HPLC) coupled with an evaporative light-scattering detector (ELSD). Sulforaphane was extracted from acid-hydrolyzed broccoli samples, followed by solid-phase extraction and reversed-phase HPLC. Sulforaphane was detected by ELSD and concurrently identified by electrospray ionization time-of-flight mass spectrometry. The recovery of sulforaphane from broccoli samples was above 95%. The detection limit was 0.5 μg. The present method was sensitive enough to determine sulforaphane in mature broccoli, broccoli sprouts, and commercial broccoli products. Sulforaphane concentration in broccoli sprout (1153 mg/100 g dry weight) was about 10 times higher than that of mature broccoli (44−171 mg/100 g dry weight). Therefore, the broccoli sprout is recommended as a source of sulforaphane-rich products. In contrast, we found that sulforaphane could not be detected in most of broccoli products, suggesting present commercial broccoli products having low quality. Keywords: Broccoli; broccoli sprouts; evaporative light-scattering detector (ELSD); sulforaphane
AbstractList Broccoli sulforaphane has received attention as a possible anticarcinogen. Sulforaphane analysis is difficult due to the lack of a chromophore for spectrometric detection. Hence, we developed a method for determining sulforaphane by using high-performance liquid chromatography (HPLC) coupled with an evaporative light-scattering detector (ELSD). Sulforaphane was extracted from acid-hydrolyzed broccoli samples, followed by solid-phase extraction and reversed-phase HPLC. Sulforaphane was detected by ELSD and concurrently identified by electrospray ionization time-of-flight mass spectrometry. The recovery of sulforaphane from broccoli samples was above 95%. The detection limit was 0.5 μg. The present method was sensitive enough to determine sulforaphane in mature broccoli, broccoli sprouts, and commercial broccoli products. Sulforaphane concentration in broccoli sprout (1153 mg/100 g dry weight) was about 10 times higher than that of mature broccoli (44−171 mg/100 g dry weight). Therefore, the broccoli sprout is recommended as a source of sulforaphane-rich products. In contrast, we found that sulforaphane could not be detected in most of broccoli products, suggesting present commercial broccoli products having low quality. Keywords: Broccoli; broccoli sprouts; evaporative light-scattering detector (ELSD); sulforaphane
Broccoli sulforaphane has received attention as a possible anticarcinogen. Sulforaphane analysis is difficult due to the lack of a chromophore for spectrometric detection. Hence, we developed a method for determining sulforaphane by using high-performance liquid chromatography (HPLC) coupled with an evaporative light-scattering detector (ELSD). Sulforaphane was extracted from acid-hydrolyzed broccoli samples, followed by solid-phase extraction and reversed-phase HPLC. Sulforaphane was detected by ELSD and concurrently identified by electrospray ionization time-of-flight mass spectrometry. The recovery of sulforaphane from broccoli samples was above 95%. The detection limit was 0.5 microgram. The present method was sensitive enough to determine sulforaphane in mature broccoli, broccoli sprouts, and commercial broccoli products. Sulforaphane concentration in broccoli sprout (1153 mg/100 g dry weight) was about 10 times higher than that of mature broccoli (44-171 mg/100 g dry weight). Therefore, the broccoli sprout is recommended as a source of sulforaphane-rich products. In contrast, we found that sulforaphane could not be detected in most of broccoli products, suggesting present commercial broccoli products having low quality.
Broccoli sulforaphane has received attention as a possible anticarcinogen. Sulforaphane analysis is difficult due to the lack of a chromophore for spectrometric detection. Hence, we developed a method for determining sulforaphane by using high-performance liquid chromatography (HPLC) coupled with an evaporative light-scattering detector (ELSD). Sulforaphane was extracted from acid-hydrolyzed broccoli samples, followed by solid-phase extraction and reversed-phase HPLC. Sulforaphane was detected by ELSD and concurrently identified by electrospray ionization time-of-flight mass spectrometry. The recovery of sulforaphane from broccoli samples was above 95%. The detection limit was 0.5 mug. The present method was sensitive enough to determine sulforaphane in mature broccoli, broccoli sprouts, and commercial broccoli products. Sulforaphane concentration in broccoli sprout (1153 mg/100 g dry weight) was about 10 times higher than that of mature broccoli (44-171 mg/100 g dry weight). Therefore, the broccoli sprout is recommended as a source of sulforaphane-rich products. In contrast, we found that sulforaphane could not be detected in most of broccoli products, suggesting present commercial broccoli products having low quality.
Author Nakagawa, Kiyotaka
Suzuki, Toshihide
Higuchi, Ohki
Miyazawa, Teruo
Tsuzuki, Tsuyoshi
Umeda, Toshiko
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Keywords broccoli sprouts
Broccoli
sulforaphane
Vegetables
Detector
Light scattering
Sample
Quality
evaporative light-scattering detector (ELSD)
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  doi: 10.1016/S0022-2275(20)34367-4
  contributor:
    fullname: Christie W. W
– volume: 935
  start-page: 338
  year: 2001
  ident: jf051823gb00017/jf051823gb00017_1
  publication-title: J. Chromatogr., A
  contributor:
    fullname: Lin G.
SSID ssj0008570
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Snippet Broccoli sulforaphane has received attention as a possible anticarcinogen. Sulforaphane analysis is difficult due to the lack of a chromophore for...
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SubjectTerms Biological and medical sciences
Brassica - chemistry
broccoli
broccoli sprouts
Chromatography, High Pressure Liquid
detectors
dietary supplements
evaporative light scattering detectors
food analysis
food composition
Food industries
Fruit and vegetable industries
Fundamental and applied biological sciences. Psychology
high performance liquid chromatography
Hydrogen-Ion Concentration
Hydrolysis
Isothiocyanates
Light
light scattering
powders
raw vegetables
reversed-phase high performance liquid chromatography
Scattering, Radiation
Spectrometry, Mass, Electrospray Ionization
sprouts
sulforaphane
tablets
Thiocyanates - analysis
Title Evaporative Light-Scattering Analysis of Sulforaphane in Broccoli Samples:  Quality of Broccoli Products Regarding Sulforaphane Contents
URI http://dx.doi.org/10.1021/jf051823g
https://api.istex.fr/ark:/67375/TPS-GL4V0ZR3-Q/fulltext.pdf
https://www.ncbi.nlm.nih.gov/pubmed/16569031
https://search.proquest.com/docview/67809200
Volume 54
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