Nutrients 2010, 2(7), 752-761; doi:10.3390/nu2070752
Article

Fractional Absorption of Active Absorbable Algal Calcium (AAACa) and Calcium Carbonate Measured by a Dual Stable-Isotope Method

Kazuhiro Uenishi 1,* email, Takuo Fujita 2 email, Hiromi Ishida 3 email, Yoshio Fujii 4 email, Mutsumi Ohue 2 , Hiroshi Kaji 5 email, Midori Hirai 6 email, Mikio Kakumoto 6  and Steven A. Abrams 7 email
1 Laboratory of Physiological Nutrition, Kagawa Nutrition University. 3-9-21 Chiyoda, Sakado, Saitama 350-0288, Japan 2 Katsuragi Hospital, 250-1 Makamicho, Kishiwada, Osaka 596-0842, Japan 3 Laboratory of Administrative Dietetics, Kagawa Nutrition University. 3-9-21 Chiyoda, Sakado, Saitama 350-0288, Japan 4 Fujii Clinic, 4-18-1 Tsutsujigaoka, Tarumi-ku, Kobe, Hyogo 650-0853, Japan 5 Division of Diabetes, Metabolism and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, 7-5-1 Kusunokichou, Chuo-ku, Kobe, Hyogo 650-0017, Japan 6 Department of Hospital Pharmacy and Pharmacodynamics, Kobe University Graduate School of Medicine, 7-5-1 Kusunokichou, Chuo-ku, Kobe, Hyogo 650-0017, Japan 7 Department of Agriculture, Agricultural Research Service, Children’s Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine and Texas Children’s Hospital, Houston, Texas 77030, USA
* Author to whom correspondence should be addressed.
Received: 10 June 2010; in revised form: 2 July 2010 / Accepted: 8 July 2010 / Published: 12 July 2010
(This article belongs to the Special Issue Dietary Calcium)
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Abstract: With the use of stable isotopes, this study aimed to compare the bioavailability of active absorbable algal calcium (AAACa), obtained from oyster shell powder heated to a high temperature, with an additional heated seaweed component (Heated Algal Ingredient, HAI), with that of calcium carbonate. In 10 postmenopausal women volunteers aged 59 to 77 years (mean ± S.D., 67 ± 5.3), the fractional calcium absorption of AAACa and CaCO3 was measured by a dual stable isotope method. 44Ca-enriched CaCO3 and AAACa were administered in all subjects one month apart. After a fixed-menu breakfast and pre-test urine collection (Urine 0), 42Ca-enriched CaCl2 was intravenously injected, followed by oral administration of 44Ca-enriched CaCO3 without carrier 15 minutes later, and complete urine collection for the next 24 hours (Urine 24). The fractional calcium absorption was calculated as the ratio of Augmentation of 44Ca from Urine 0 to Urine 24/ augmentation of 42Ca from Urine 0 to Urine 24. Differences and changes of 44Ca and 42Ca were corrected by comparing each with 43Ca. Fractional absorption of AAACa (mean ± S.D., 23.1 ± 6.4), was distinctly and significantly higher than that of CaCO3 (14.7 ± 6.4; p = 0.0060 by paired t-test). The mean fractional absorption was approximately 1.57-times higher for AAACa than for CaCO3. The serum 25(OH) vitamin D level was low (mean ± S.D., 14.2 ± 4.95 ng/ml), as is common in this age group in Japan. Among the parameters of the bone and mineral metabolism measured, none displayed a significant correlation with the fractional absorption of CaCO3 and AAACa. Higher fractional absorption of AAACa compared with CaCO3 supports previous reports on the more beneficial effect of AAACa than CaCO3 for osteoporosis.
Keywords: active absorbable algal calcium (AAACa); calcium carbonate; dual stable Ca isotope method; fractional absorption (FA); parathyroid hormone (PTH)

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Cite This Article

MDPI and ACS Style

Uenishi, K.; Fujita, T.; Ishida, H.; Fujii, Y.; Ohue, M.; Kaji, H.; Hirai, M.; Kakumoto, M.; Abrams, S.A. Fractional Absorption of Active Absorbable Algal Calcium (AAACa) and Calcium Carbonate Measured by a Dual Stable-Isotope Method. Nutrients 2010, 2, 752-761.

AMA Style

Uenishi K, Fujita T, Ishida H, Fujii Y, Ohue M, Kaji H, Hirai M, Kakumoto M, Abrams SA. Fractional Absorption of Active Absorbable Algal Calcium (AAACa) and Calcium Carbonate Measured by a Dual Stable-Isotope Method. Nutrients. 2010; 2(7):752-761.

Chicago/Turabian Style

Uenishi, Kazuhiro; Fujita, Takuo; Ishida, Hiromi; Fujii, Yoshio; Ohue, Mutsumi; Kaji, Hiroshi; Hirai, Midori; Kakumoto, Mikio; Abrams, Steven A. 2010. "Fractional Absorption of Active Absorbable Algal Calcium (AAACa) and Calcium Carbonate Measured by a Dual Stable-Isotope Method." Nutrients 2, no. 7: 752-761.

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