市販ホウレンソウ中のシュウ酸、硝酸含量の酵素法による測定  [in Japanese] Measurement of the Contents of Oxalate and Nitrate in Commercially Available Spinach by Enzymatic Analysis  [in Japanese]

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Author(s)

    • 竜口 和恵 Tatsuguchi Kazue
    • 西南女学院大学保健福祉学部栄養学科 Department of Nutritional Science, Faculty of Health and Welfare, SEINAN JO GAKUINUNIVERSITY

Abstract

1997年春から2001年春にかけて、北九州市内で販売されているホウレンソウについて、そのシュウ酸含量、硝酸含量を酵素法により測定した。シュウ酸含量は生ホウレンソウ100g中に約600〜1000mg含まれるという従来から報告されてきた値よりも低く、100g中約200〜600mgであった。硝酸含量は生ホウレンソウ100g中約80〜800mgと一番含量の低い試料と高い試料との間に10倍の差があった。ホウレンソウを葉部と葉柄部とに分けて測定すると、ほとんどの試料について葉にはシュウ酸が多く、逆に葉柄部には硝酸が多く含まれていた。重量の5倍の水で2.5分間ゆでるとシュウ酸含量は40〜80%、硝酸含量は30〜80%の減少が認められ、残存量はシュウ酸よりも硝酸で大きい傾向にあった。栽培時期や産地の違いによるホウレンソウのシュウ酸含量、硝酸含量に一定の傾向は認められなかった。

I measured the contents of oxalate and nitrate by enzymatic analysis in spinach sold in the' Kitakyushu area from spring in 1997 to spring in 2001. Although it was previously reported that about 600 to 1OOOmg of oxalate was included in 1OOg of raw spinach, the results in the present study indicated that the content (200 to 6OOmg in 1OOg spinach) was lower than those reported previously. As for nitrate, about 80 to 800mg of nitrate was included in 1OOg of raw spinach. Thus, there was ten times the difference between the samples having the lowest and the highest contents. When measuring spinach by separating it into the blade and stalk portions, in most samples, I found that the blade portion included more oxalate, while the stalk portion included more nitrate. When spinach was boiled for 2.5 minutes with five times as much water as the spinach weight, the residual contents of oxalate was decreased by 40-80%, and that of nitrate was decreased by 30-80%. The residual amounts of nitrate tended to be larger than oxalate. In the differences of contents of oxalate and nitrate in spinach, no particular patterns specific to the period of cultivation and the area of production were observed.

Journal

  • Bulletin of Seinan Jo Gakuin University

    Bulletin of Seinan Jo Gakuin University 9, 104-111, 2005

    Seinan Jo Gakuin University

Codes

  • NII Article ID (NAID)
    110004597438
  • NII NACSIS-CAT ID (NCID)
    AA11156368
  • Text Lang
    JPN
  • Journal Type
    大学紀要
  • ISSN
    13426354
  • NDL Article ID
    7333122
  • NDL Source Classification
    ZE5(社会・労働--社会問題・社会保障) // ZS47(科学技術--医学--治療医学・看護学・漢方医学)
  • NDL Call No.
    Z6-B971
  • Data Source
    NDL  NII-ELS 
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