Brinkley L, McGuire J, Gregory J, Pak C Y
Urology. 1981 Jun;17(6):534-8. doi: 10.1016/0090-4295(81)90069-8.
The ability of 7 "oxalate-rich" foods to enhance urinary oxalate excretion was measured in 8 normal volunteers. The analyzed value for oxalate was high for spinach (1,236 mg.), moderate for chocolate (126 mg.) and tea (66 mg.), and for low vegetable juice, cranberry juice, pecans, and orange juice (2 to 26 mg.). The urinary oxalate increased by 29.3 mg. during eight hours after ingestion of spinach. However, it rose by less than 4.2 mg. from consumption of other food items. The bioavailable oxalate (per cent of total appearing in urine) was much less from food items of high or moderate oxalate content (spinach and chocolate) than from standard solutions of sodium oxalate (2.4 to 2.6 versus 6.5 to 7.3 per cent). Thus, only spinach among food items tested was capable of causing hyperoxaluria in normal subjects.
在8名正常志愿者中测量了7种“富含草酸盐”食物促进尿草酸盐排泄的能力。菠菜的草酸盐分析值较高（1236毫克），巧克力（126毫克）和茶（66毫克）的草酸盐分析值中等，而蔬菜汁、蔓越莓汁、山核桃和橙汁的草酸盐分析值较低（2至26毫克）。摄入菠菜后8小时内，尿草酸盐增加了29.3毫克。然而，食用其他食物后尿草酸盐增加不到4.2毫克。高草酸盐含量或中等草酸盐含量的食物（菠菜和巧克力）中可生物利用的草酸盐（尿液中出现的总量的百分比）比草酸钠标准溶液中的少得多（2.4%至2.6%对6.5%至7.3%）。因此，在测试的食物中，只有菠菜能够使正常受试者出现高草酸尿症。
