In vitro calcium bioavailability of vegetables, legumes and seeds

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• 作者：Kamchan ; Achiraya ; Puwastien ; Prapasri ; Sirichakwal ; Prapaisri P. ; Kongkachuichai ; Ratchanee
• 关键词：Calcium bioavailability ; Vegetables ; Seeds and legumes ; Thailand
• 刊名：Journal of Food Composition and Analysis
• 出版年：2004
• 出版时间：June - August, 2004
• 年：2004
• 卷：17
• 期：3-4
• 页码：311-320
• 全文大小：191 K

文摘

Plant foods high in calcium were collected from representative markets in Bangkok. The purpose of this research was to study the bioavailability of calcium in plant sources and the presence of some in situ calcium inhibitory factors. Single composite samples from each market were prepared as commonly consumed and analyzed for in vitro calcium bioavailability (by equilibrium dialysis after simulated gastric digestion method) and for dietary fiber, phytate and oxalate. Compared to milk powder, which contains 25mg calcium/100g, five out of 11 vegetables had higher calcium dialysability (25 % ). High levels of dialysable calcium (20–39 % ) were found in kale, celery, collard, pak-chee-lao (Anethum graveolens L.), Chinese cabbage and soybean sprouts. These vegetables contained low levels of dietary fiber, phytate and oxalate. Medium levels of dialysable calcium (11–18 % ) were found in Indian mulberry and sesbania leaves, both of which had medium levels of oxalate (290–580mg/100g). Medium levels of dialyzable calcium were also found in young and mature cooked soybean seeds, both of which had low levels of oxalate and medium levels of phytate (290–400mg/100g). Pak-paw (Polygonum odoratum Lour.), amaranth, wild betal and white and black sesame seeds contained low dialysable calcium (2–7 % ) with high level of oxalate (680–2620mg/100g). Sesame seeds also contained high levels of dietary fiber and phytate. The presence of inhibitory factors, especially oxalate, at high or medium levels could limit the calcium bioavailability of plant foods.