Distribution and levels of four calcium components among several cultivars of turnip rape (Brassica napus L. and B. campestris L.) compared to other vegetables

摘要

Several vegetables and turnip rape cultivars were analysed for 4 calcium components: water-soluble calcium (consisting of organic acid salts, inorganic salts and calcium ion), 1N NaCl-soluble calcium pectate and protein-binding calcium, 2% acetic acid-soluble calcium phosphate, and 5% HCl-soluble calcium oxalate. Turnip rape contained the highest content of total calcium and water-soluble calcium compared with Chrysanthemum coronarium, lettuce, spinach and Welsh onions. In turnip rapes, the major calcium component was water-soluble calcium. Among 4 cultivars of turnip rape (B. napus; Miyauchina, Shinkirina, Keichikuzairai and Gogatsuna), Keichikuzairai had the highest contents of water-soluble calcium and 2% acetic acid-soluble calcium. Among 3 cultivars of turnip rape (Brassica campestris; Komatsuna, Bitaminna and Haruna), Haruna possessed the highest content of water-soluble calcium.