Carrots calcium

How pectic signals were transduced was unknown, but information suggested that cytosolic free Ca might be involved [22]. Fluorescence ratio imaging has then been used to follow the evolution of free calcium concentrations ([Ca " ] ) after stimulation of carrot protoplasts by oligogalacturonides [23]. 

Effect of a new canning process on cell wall pectic substances, calcium retention and texture of canned carrots... 

Kohman (3) determined that spinach interfered with growth and bone formation. Studies were conducted on 21-day-old rats for 21 or 28 days and body calcium determined. The diets furnished about 0.22% calcium supplied by calcium carbonate, calcium oxalate, 8.2% spinach, or 4.5% turnip greens. The supplements were added to a diet containing meat, peas, carrots, and sweet potatoes. 

Mean 3-day calcium balances, determined for from 2-5 periods, were positive for all diets, but were lower on the diets containing carrots and spinach. The authors concluded that children do not utilize calcium from vegetables as well as that from milk. 

Sila, D., Smout, C., Vu, S., and Hendrickx, M. (2004). Effects of high-pressure pretreatment and calcium soaking on the texture degradation kinetics of carrots during thermal processing. / Food Sci. 69, E205-E211. 

DC028 Thuleau, P., A. Graziana, R. Ranjeva, and J. I. Schroeder. Solubilized proteins from carrot Daucus carota L.) membranes bind calcium channel blockers and form calcium-permeable ion channels. Proc Nat Acad Sci (USA) 1993 90 765-769. 

The wall material of plant cells is one of their distinguishing characteristics. As a result, lignin, cellulose, and other wall constituents have been studied in many plant tissue cultures. Phenylpropanoids. for example, have been shown lo be precursors of lignin formation in while pine. Set/noiii. lilac, rose, carrot, and geranium tissue cultures. Moreover, the biosynthesis of lignin has been shown to be alTeeted by kinetin. boron, and major elements, such as calcium. 

Calcium hydroxide is an excellent adsorbent for resolving carotenoid cis-trans isomers compared with alumina, it is less retentive and less sensitive to temperature and moisture content of the mobile phase. However, calcium hydroxide columns are not commercially available, and separations using them can be difficult to reproduce, owing to extreme sensitivities to mobile-phase composition and temperature. Nine cis-/3-carotenes were characterized from a chromatogram of 18 peaks after isocratic elution of a mixture obtained by thermal isomerization and photoisomerization of /3-carotene (162). Chandler and Schwartz (10), using a calcium hydroxide column and a mobile phase of hexane containing 0.3% acetone, separated six carotene isomers from canned carrots. These were, in order of elution, two cw-a-carotenes, all-tram-a-carotcnc, 13-m-/3-carotcnc, all- ram-/3-carotene, and 9-cw-/3-carotene. A mobile phase of hexane modified with 2% p-methylanisole separated all-rram-/3-carotcnc and its 9-, 13-, and 15-cis isomers in an iodine isomerized mixture (163). 

Hulst and co-workers obtained a value for the 02 uptake in both suspended and calcium alginate immobilized Daucus carota (carrot) cells [31]. This value was approximately 3 X 10 7 mol g v s-1. Nevertheless, the value of Hallsby s estimate of uptake of oxygen, 3 x 10-10 g v mol-1 s 1 for N. tabacum, will be used [32,33]. Hulsfs observation that specific consumption was similar for suspended and immobilized cells is assumed to apply [31]. 

Pectinesterase action was first reported in 1840 by Fremy (56). He noted that the addition of carrot juice to a pectin solution caused formation of a gel. This gel was produced by the enzymatic deesterification of pectin followed by precipitation of the resulting polygalacturonic acid as calcium pectate 20), Various names such as pectin meth-oxylase and pectin methyl esterase have been applied to the enzyme, but pectinesterase is the preferred trivial name (57). 

Nutritional analyses of moringa showed that the leaves contained high levels of calcium (2%) and iron (28 mg/100 g dry leaves) (5-5). Other reports have shown that moringa can contain seven times more vitamin C than oranges, four times more calcium and two times more proteins than milk, four times more vitamin A than carrots and three times more potassium than bananas (5). 

The ability of metal ions to modify the texture of fruit and vegetable tissue has been studied since 1939, when Kertesz (l) found that calcium ions improved the firmness of tomatoes. A very simplified generalization of the effects of metal ions on fruit and vegetable texture is that monovalent cations, usually Na+ and K, cause tissue softening. Examples of this softening effect include results with peas (2.31, dried peas (4), carrots (5), potatoes (6) and green beans (7). On the other hand calcium, a divalent cation,... 

Carrot fiber, prepared as an alcohol-acetone insoluble residue of cell wall material, binds deoxycholate and chenodeoxycholate under physiological conditions with the release of protons. Removal of calcium pectate from this material by extraction with ammonium oxalate reduces the capacity of carrot fiber to bind bile acids. Calcium carboxymethyl cellulose exhibits similar binding activity, whereas free carboxymethyl cellulose shows no binding. Calcium pectate prepared from citrus pectin and dissolved in water was found to bind bile acids under conditions used with carrot fiber. These results suggest that binding occurs through formation of salt linkage between calcium pectate in the cell wall residue and a bile acid. 

Carrot fiber has been shown to bind bile acids under physiological conditions (1,2). Our earlier investigations have established that co-binding of bile acids releases protons and can be related to the content of calcium in the fiber preparation (2). 

We have proposed that the binding of bile acids to carrot fiber, or cell wall residue rich in pectin, may involve salt linkages between calcium pectate and the carboxylate group of the bile acid. This report presents studies that furnish additional evidence that calcium pectate does have a role in the binding of bile acids to carrot fiber. 

Treatment of carrot AAIR with ammonium oxalate resulted in removal of about 25% of the mass of the material. The calcium content of remaining AAIR was reduced from 0.92% to 0.26% (Table I). The AAIR after extraction with ammonium oxalate exhibits a reduced capacity to co-bind CDC and DC, as shown in Table I. 

Carrots are even a good source of calcium, so snack away And don t worry about the white deposit that sometimes appears on the surface of the little bagged carrots. It s just naturally occurring sugar that crystallizes out as moisture evaporates. 

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