Extraction of calcium, oxalate and calcium oxalate crystals from sesame seeds.

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Other Title
  • ごま中のカルシウム，シュウ酸及びシュウ酸カルシウム結晶の分離抽出
  • ゴマチュウ ノ カルシウム シュウサン オヨビ シュウサン カルシウム ケッショ

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Description

Sesame seeds were pulverized in a food blender and the free calcium and oxalic acid were extracted from pulverized sesame seeds into boiling water. The total oxalic acid was extracted into 0.1 M hydrochloric acid. Contents of calcium and oxalate were determined by AAS and ion chromatography. On the other hand the sesame seeds pulverized in water poured into a beaker. The calcium oxalate crystals which sank in the mixture were carefully gathered by decanting the supernatant liquid. Seventy milligrams and 800 mg of calcium were extracted into boiling water and 0.1 M hydrochloric acid, respectively, from 100 g of sesame seeds. The total and free oxalic acids were found to be 1750 mg and 350 mg, respectively, per 100 g of sesame seeds. As the total calcium content in 100 g of sesame seeds was 800 mg, the nutrient calcium content was estimated to be 165 mg from the difference between the content of calcium in calcium oxalate and the total calcium.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 43 (2), 151-155, 1994

    The Japan Society for Analytical Chemistry

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