Influence of conventional and organic agricultural practices on the phenolic content in eggplant pulp: Plant-to-plant variation

Devanand Luthria, Ajay P. Singh, Ted Wilson, Nicholi Vorsa, Gary S. Banuelos, Bryan T. Vinyard

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

Consumer awareness, pesticide and fertiliser contaminations, and environmental concerns have resulted in significant demand for organically grown farm products. The present study evaluates the influence that organic and conventional farming practices exert on the total phenolic content in eggplant samples from two cultivars, Blackbell (American eggplant) and Millionaire (Japanese eggplant), grown by conventional and organic farming practices with similar climatic conditions. In addition, plant-to-plant variation in phenolic content was determined from eight eggplant samples collected from different plants grown at various field positions. Samples were separately assayed for phenolic content by the two independent procedures, HPLC/LC-MS and Folin-Ciocalteu assay. The results of the HPLC analysis showed significant plant-to-plant variation (% RSD ranged from 22% to 48%) in 5-caffeoylqunic acid content (the most abundant phenolic acid) in eight eggplant samples collected from eight different plants belonging to the same cultivar and grown under similar conditions. The cv. Millionaire showed a higher total phenolic content compared to the Blackbell cultivar. We did not observe significant consistent trend in the phenolic content of eggplant samples grown with organic and conventional farming practices with both eggplant cultivars. We, however, observed a strong correlation (R2 = 0.87) between total phenolic content as assayed by Folin-Ciocalteu assay and 5-caffeoylqunic acid, a major phenolic acid in eggplant extract. This study concludes that multiple repetitive analyses of plant products collected from different plants grown over various time periods (seasons) at different locations should always be carried to unambiguously prove the impact of growing conditions on phenolic content or antioxidant activity.

Original languageEnglish (US)
Pages (from-to)406-411
Number of pages6
JournalFood Chemistry
Volume121
Issue number2
DOIs
StatePublished - Jul 15 2010

Fingerprint

Solanum melongena
eggplants
Pulp
pulp
Assays
Acids
Fertilizers
Organic Agriculture
organic production
Pesticides
Farms
Contamination
Antioxidants
farming systems
cultivars
phenolic acids
sampling
High Pressure Liquid Chromatography
plant products
phenolic acid

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Food Science

Keywords

  • 5-Caffeoylqunic acid
  • Conventional and organic
  • Eggplant (Solanum melongena L.)
  • Folin-Ciocalteu
  • HPLC and LC-MS analysis
  • Plant-to-plant variations
  • Polyphenols
  • Total phenolics

Cite this

Luthria, Devanand ; Singh, Ajay P. ; Wilson, Ted ; Vorsa, Nicholi ; Banuelos, Gary S. ; Vinyard, Bryan T. / Influence of conventional and organic agricultural practices on the phenolic content in eggplant pulp : Plant-to-plant variation. In: Food Chemistry. 2010 ; Vol. 121, No. 2. pp. 406-411.
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abstract = "Consumer awareness, pesticide and fertiliser contaminations, and environmental concerns have resulted in significant demand for organically grown farm products. The present study evaluates the influence that organic and conventional farming practices exert on the total phenolic content in eggplant samples from two cultivars, Blackbell (American eggplant) and Millionaire (Japanese eggplant), grown by conventional and organic farming practices with similar climatic conditions. In addition, plant-to-plant variation in phenolic content was determined from eight eggplant samples collected from different plants grown at various field positions. Samples were separately assayed for phenolic content by the two independent procedures, HPLC/LC-MS and Folin-Ciocalteu assay. The results of the HPLC analysis showed significant plant-to-plant variation ({\%} RSD ranged from 22{\%} to 48{\%}) in 5-caffeoylqunic acid content (the most abundant phenolic acid) in eight eggplant samples collected from eight different plants belonging to the same cultivar and grown under similar conditions. The cv. Millionaire showed a higher total phenolic content compared to the Blackbell cultivar. We did not observe significant consistent trend in the phenolic content of eggplant samples grown with organic and conventional farming practices with both eggplant cultivars. We, however, observed a strong correlation (R2 = 0.87) between total phenolic content as assayed by Folin-Ciocalteu assay and 5-caffeoylqunic acid, a major phenolic acid in eggplant extract. This study concludes that multiple repetitive analyses of plant products collected from different plants grown over various time periods (seasons) at different locations should always be carried to unambiguously prove the impact of growing conditions on phenolic content or antioxidant activity.",
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Influence of conventional and organic agricultural practices on the phenolic content in eggplant pulp : Plant-to-plant variation. / Luthria, Devanand; Singh, Ajay P.; Wilson, Ted; Vorsa, Nicholi; Banuelos, Gary S.; Vinyard, Bryan T.

In: Food Chemistry, Vol. 121, No. 2, 15.07.2010, p. 406-411.

Research output: Contribution to journalArticle

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T1 - Influence of conventional and organic agricultural practices on the phenolic content in eggplant pulp

T2 - Plant-to-plant variation

AU - Luthria, Devanand

AU - Singh, Ajay P.

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