Charoenkiatkul S, Kriengsinyos W, Tuntipopipat S, Suthutvoravut U, Weaver C M
Institute of Nutrition, Mahidol University, Nakhon Pathom, Bangkok, Thailand.
J Food Sci. 2008 Nov;73(9):H218-21. doi: 10.1111/j.1750-3841.2008.00949.x.
The absorbability of calcium from ivy gourd, a green leafy vegetable (Coccinia grandix Voigt.) and winged bean young pods (Psophocarpus tetragonolobus [L] DC) were measured in 19 healthy adult women aged 20 to 45 y, in a 3-way, randomized-order, crossover design with an average calcium load of 100 mg and milk as the referent. The test meals were extrinsically labeled with 44Ca and given with rice as breakfast after an overnight fast. Absorption of calcium was determined on a blood sample drawn 5 h after ingestion of the test meal. Fractional calcium absorption (X+/- SD) was 0.391 +/- 0.128 from winged beans, 0.476 +/- 0.109 from ivy gourd, and 0.552 +/- 0.119 from milk. The difference in fractional calcium absorption for these 2 vegetables was significant (P < 0.05) and the fractional calcium absorption from these 2 vegetables were both significantly lower than from milk. The difference was partly accounted for by the phytate, oxalate, and dietary fiber content of the vegetables. However, calcium bioavailability of these 2 vegetables, commonly consumed among Thais, was relatively good compared to milk (71% to 86% of milk) and could be generally recommended to the public as calcium sources other than milk and Brassica vegetables.
在19名年龄在20至45岁的健康成年女性中，采用三因素随机顺序交叉设计，以平均钙负荷100毫克且以牛奶作为对照，测定了绿叶蔬菜葫芦（Coccinia grandix Voigt.）和四棱豆嫩荚（Psophocarpus tetragonolobus [L] DC）中钙的吸收情况。测试餐用44Ca进行外源性标记，在禁食过夜后与米饭一起作为早餐给予。在摄入测试餐后5小时采集血样，测定钙的吸收情况。四棱豆的钙吸收分数（X±SD）为0.391±0.128，葫芦为0.476±0.109，牛奶为0.552±0.119。这两种蔬菜的钙吸收分数差异显著（P<0.05），且这两种蔬菜的钙吸收分数均显著低于牛奶。这种差异部分是由蔬菜中的植酸盐、草酸盐和膳食纤维含量造成的。然而，与牛奶相比，泰国人常食用的这两种蔬菜的钙生物利用率相对较好（为牛奶的71%至86%），一般可作为除牛奶和十字花科蔬菜之外的钙源推荐给公众。
