This study is focused on the evaluation of zinc oxide properties and behavior at commercially available cosmetic ingredients by in vitro methods of dermal absorption of zinc oxide and its subsequent chemical determinations. Two methods for determination of ZnO were used and the results were compared. The spectrophotometric method (SPM) was selected for its sensitivity and atomic absorption spec...

Maintaining a constant state of cellular zinc nutrition, or homeostasis, is essential for normal function. In animals and humans, adjustments in zinc absorption and endogenous intestinal excretion are the primary means of maintaining zinc homeostasis. The adjustments in gastrointestinal zinc absorption and endogenous excretion are synergistic. Shifts in endogenous excretion appear to occur quic...

Well planned vegetarian diets can provide adequate amounts of zinc from plant sources. Vegetarians appear to adapt to lower zinc intakes by increased absorption and retention of zinc. Good sources of zinc for vegetarians include whole grains, tofu, tempeh, legumes, nuts and seeds, fortified breakfast cereals and dairy products. The inhibitory effects of phytate on absorption of zinc can be mini...

The effect of zinc deficiency on the function of the intestine to absorb water and electrolytes was studied in animal models, stimulated by Vibrio cholerae enterotoxin. Sprague-Dawley rats, used in the study, were divided into four groups: Zinc-deficient, ad libitum zinc-fed control, zinc weight-matched control, and zinc-deficient acutely-repleted. 14C-labelled polyethylene glycol solution was ...

There is concern regarding the absorption of zinc, both from dietary intake and nutritional supplements, because of zinc’s essential role in human nutrition and metabolism, and because of evidence that some population groups have a marginal to deficient intake of zinc. While oral zinc supplementation is efficacious in most zinc deficiency conditions, not all zinc preparations have equal bioavai...

The objective of this study was to determine fractional absorption of exogenous zinc and intestinal excretion of endogenous zinc in women of childbearing age whose habitual dietary zinc intake was marginal. The target population (L group) comprised residents of a remote farming village in northeast China and the control subjects (M group) were residents of Beijing. Mean (+/-SE) calculated dieta...

After iron deficiency, zinc deficiency is the major micronutrient deficiency in developing countries, and staple food fortification is an effective strategy to prevent and improve it among at-risk-populations. No action has been taken to reduce zinc deficiency via flour fortification so far in Iran, and little is known about the influence of zinc fortification of flour on serum zinc and the iro...

Zinc is an essential trace element that plays a vital role as a co-factor in enzyme action, cell membrane stabilization, gene expression and cell signaling [1]. It is also important in insulin action and carbohydrate metabolism [2]. Zinc is involved in the physiology of insulin at several stages; it is found in the insulin secretory granules and is known to participate in the insulin synthesis,...

Vegetable protein sources are often mixed with cereals for complementary feeding. Both contain high levels of phytic acid, which can inhibit trace element and mineral absorption. In adults, phytic acid has been reported to inhibit the absorption of iron, zinc, calcium and manganese but not copper. There are far fewer studies in infants. Phytic acid is a strong inhibitor of iron absorption in bo...

Zinc is an essential trace element that plays a vital role as a co-factor in enzyme action, cell membrane stabilization, gene expression and cell signaling [1]. It is also important in insulin action and carbohydrate metabolism [2]. Zinc is involved in the physiology of insulin at several stages; it is found in the insulin secretory granules and is known to participate in the insulin synthesis,...