Journal of Nutrition and Health

The Korean Nutrition Society (한국영양학회)
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Bioavailability and Digestibility of Organic Calcium Sources by Bone Health Index

뼈건강 지표를 이용한 유기태 칼슘 급원의 생체이용성 및 소화율

  • Received : 2009.12.16
  • Accepted : 2010.01.12
  • Published : 2010.02.28
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Abstract

This study was carried out to evaluate the bioavailabilities and the digestibilities of oligopeptide chelated (peptide-Ca), anchovy bone (anchovy-Ca) and methionine hydroxyl analogue (MHA-Ca) calcium compared to those of calcium carbonate in rats. In exp1, $CaCO_3$, were added to the basal diet at level of 0, 30 and 60% calcium of the AIN-93G diet. In test groups, peptide-Ca, anchovy-Ca and MHA-Ca, were added to the basal diet to provide calcium at the level of 40% of AIN-93G. In exp1, the bioavailabilities were evaluated from the regression equation of the ratios of theological/ actual calcium intakes of each dietary treatment. In exp2, urine and feces was to evaluate the true- and apparent digestibility and apparent retention. In exp1, Ca-60% group had higher bone mineral density (BMD), bone mineral content (BMC) and bone breaking strength (BBS) than those of the other standard groups. The bone weight and ash content of the peptide-Ca and anchovy-Ca groups were significantly higher than those of the MHA-Ca. Bone calcium content were not significantly different from the test group. The bioavailability of the MHA-Ca group was shown higher BMD (71%), BS (38%) and BBS (27%) compared to another control group. But the regression coefficient for BMD, BS and BBS were lower compare with that of bone ash and BMC. In exp2, the true- and apparent digestibility of test groups were shown to over 90%. Peptide-Ca was not significantly different from other test group, but digestibility and retention were higher compare to other test groups. In conclusion, peptide-Ca, anchovy-Ca and MHA-Ca improved Ca bioavailability in the rats. The compounds were higher Ca digestibility compared with those of $CaCO_3$. It is assumed that difference of digestibility for test groups may be correlated to the bioavailability of test groups in BMD, BMC, BS, BBS and bone ash respectively.

본 연구는 $CaCO_3$를 표준으로 장내 칼슘 흡수를 촉진하는 peptide-Ca, anchovy-Ca, methionine hydroxyl analogue calcium의 생체이용성과 소화율을 평가하였다. 표 준군은 $CaCO_3$를 AIN-93G (1993)를 기준으로 칼슘 요구량의 0%, 30%, 60%로 첨가하여 모든 분석 항목에 대한 비교기준으로 삼았다. 실험군은 요구량의 40% 수준으로 각기 다른 칼슘 공급원으로 실험하였다. 실험결과는 대부분 칼슘 함량이 높은 Ca-60%군이 가장 높은 수치를 보여 주어 칼슘의 섭취량과 비례하여 양의 상관 관계를 보여 주었다. 생체이용성 평가에서는 MHA-Ca 군이 체중 증가량, BMD, BS, BBS 항목에서 높은 이용성을 보여 주었다. peptide-Ca은 회귀계수가 높은 회분함량 ($R^2\;=\;0.98$)과 BMC ($R^2\;=\;0.935$)를 이용한 평가 에서 표준군에 비해 11%, 7% 높은 이용성을 보여주었다. Anchovy-Ca군 역시 여러 생체이용성 평가항목에서 높은 이용성을 나타냈다. 이는 동일한 양의 칼슘을 섭취했을 때 실험군이 표준으로 사용된 $CaCO_3$ 보다 높은 칼슘 이용성을 가지고 있음을 의미한다. 하지만 본 연구로는 유기태 칼슘이 어떤생리 활성 작용을 통해 이러한 결과를 나타냈는지는 알 수 없었으며, 이 부분을 분명하게 규명하는 추가적인 연구가 필요한 것으로 판단된다. 소화율 측정항목에서는 Ca-0%군을 제외하고는 90% 이상 높은 칼슘 소화율을 나타냈다. 소화율과 보유율에서 peptide-Ca군이 유의한 차이는 없었지만 다른 실험군에 비해 미세하게 높았다. 이러한 차이의 축적으로 인해 생체이용성 평가시 실험군간 차이를 보여 주었다. 결국 공급한 칼슘에 대한 소화 및 흡수의 차이에 의해 뼈 건강관련 지표가 좋아지고 이로 인해 실험군의 생체 이용성이 높게 평가 되었다. Peptide-Ca와 순수한 식품 칼슘 급원인 멸치 뼈는 높은 칼슘 이용성을 나타내어, 체내칼슘 영양개선에 상당한 효과가 있슴이 증명되었다.

Keywords

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