Abstract

DELGADO-ANDRADE, C.; SEIQUER, I.  and  NAVARRO, M.ª P.. Effects of intake of heated mixtures of glucose-lysine and glucose-methionine on bone calcium. Nutr. Hosp. [online]. 2005, vol.20, n.1, pp.70-76. ISSN 1699-5198.

During food thermal treatment Maillard's reaction may occur, which implicates mainly the carbonyl groups of reductory sugars and amino protein groups. Maillard's reaction products (MRP) may interfere with mineral bioavailability because of modifications of their physical-chemical moiety in the food or the lumen, disrupting the absorption process or its normal metabolism. In this study, we sought to investigate MRP influence on issues related to Ca bioavailability in vitro and in vivo. Equimolar mixtures of glucose-lysine (GL) and glucose-methionine (GM) (40% moisture) were heated at 150º C for 90 minutes (samples GL₉₀ and GM₉₀, respectively). In vitro solubility was measured by additioning each samples to a 3.75 mM Ca solution at intestinal pH and ionic strength; after shaking and centrifugation, soluble and insoluble calcium was determined. Three percent of GL₉₀ and GM₉₀ were individually added to the AIN93-G diet to obtain D-GL₉₀ and D-GM₉₀ diets. Three Wistar rats groups were fed for 21 days with both diets and with AIN93-G as control, carrying out calcium balance during last week and extirpating various organs after sacrifice. GM₉₀ did not affect calcium solubility; GL₉₀ reduced it slightly, remaining in both cases more than 94% soluble. D-GL₉₀ and D-GM₉₀ did not modify calcium bioavailability, with as effective usage as with the control diet (57.6 ± 1.3%, 57.8 ± 2.3% and 63.9 ± 2.6% in control diet, D-GL₉₀ and D-GM₉₀, respectively). MRP intake produced, however, metabolic changes that decreased bone calcium, accumulating compensatorily in other organs.

Keywords : Maillard's reaction products; calcium; bioavailability; bone.

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