Distribution of calcium, magnesium, phosphorus, zinc, manganese, copper and iron between the soluble and colloïdal phases of ewe's and goat 's milk

Abstract

Summary -This paper examines the distribution of main elements (calcium, magnesium and phosphorus) and microelements (zinc, iron, manganese and copper) between the soluble and colloidal phases of ewe's and goat's milk. The percentages of calcium, magnesium and phosphorus were higher in the soluble phase of goat's milk (32.8, 66.4 and 38.6% respectively) than in that of ewe's milk (20.8, 56 and 34.8% respectively). In both species most of the zinc (91.6% in ewe and 87.5% in goat) and the manganese (93% and 89% in ewe and goat respectively) were found in the micellar fraction. The distribution of iron and copper differed more. The soluble phase of ewe's milk contained 28.5% iron and the soluble phase of goat's milk 44.3%. Ewe's milk contained more soluble copper (33.3%) than did goal' s milk (18.1 %).ewe's milk 1 goat's milk 1 minerai composition

Response of lactic acid bacteria to milk fortification with dietary zinc salts

“…In this investigation, the fortification method proved to significantly affect both the cheese composition (total solids, protein, fat and salt) and zinc recovery. In cows' milk, zinc is principally chelated by caseins (Al-Awadi & Srikumar, 2001;Drago & Valencia, 2002) and this explains its abundant retention in the curd during milk coagulation (Al-Awadi & Srikumar, 2001;Brulé & Fauquant, 1982;Cichoscki, Valduga, Valduga, Tornadijo, & Fresno, 2002;de la Fuente, Fontecha, & Juárez, 1996;Drago & Valencia, 2002;Gulbas & Saldamli, 2005). Desired levels of Zn 2þ (>10 mg kg À1 ), not exceeding the critical limits (Maret & Sandstead, 2006), were found in the zinc-fortified cheese batches.…”

“…A further property that makes milk-based products like yoghurt and cheese the logical choice for zinc fortification is their low pH (Rosado, 2003). In cows' milk, zinc is mainly bound to caseins, while only minor quantities of this mineral are associated with the whey and fat fractions (Al-Awadi & Srikumar, 2001;de la Fuente, Olano, & Juarez, 1997;Sandström, Keen, & Lönnerdal, 1983). More specifically, in casein micelles, two thirds of the zinc is bound to colloidal calcium phosphate and one-third bound to phosphorylated serine and threonine residues (Singh, Flynn, & Fox, 1989).…”

Estimating daily intakes of manganese due to breast milk, infant formulas, or young child nutritional beverages in the United States and France: Comparison to sufficiency and toxicity thresholds

“…Most products that we tested were supplemented with Mn, but the unsupplemented dairy infant formula with the minimum Mn concentration (230 µg/L) would supply 29 times the daily Mn intake as breast milk for a 3-week-old and approximately 47 times the AI for Mn for this age stage. Cow and goat milks generally contain higher concentrations of Mn than human breast milk (Table 1) [20,108,109], and soy and rice proteins have even higher Mn concentrations [110,111], so it is highly unlikely that there is ever a need for Mn supplementation of infant formulas or young child nutritional beverage products in order to prevent Mn deficiency or achieve nutritional adequacy.…”

Do Dairy Minerals Have a Positive Effect on Bone Health?

“…There are multiple forms of association that can occur, with both phosphate and ester groups being the most common for Ca. Additional interference occurs because other protein‐binding interactions (such as lactoferrin) can occur (De La Fuente, ; De La Fuente, Olano, & Juárez, ; López‐Fandiño, De La Fuente, Ramos, & Olano, ). The chemical form in which a macromineral or trace element is found in milk is important, because it may influence intestinal absorption and utilization (the process of transport, cellular assimilation, and conversion into a biologically active form) and thus may affect bioavailability (Chia et al., ; Zamberlin, Antunac, Havranek, & Samaržija, ).…”