Ascorbate calcium

L-Ascorbic acid biosynthesis in plants and animals as well as the chemical synthesis starts from D-glucose. The vitamin and its main derivatives, sodium ascorbate, calcium ascorbate, and ascorbyl palmitate, are officially recognized by regulatory agencies and included in compendia such as the United S fates Pharmacopeia/National Formula (USP/NF) and the Food Chemicals Codex (FCC). 

Specifications for ascorbic acid, sodium ascorbate, calcium ascorbate, and ascorbyl palmitate are found in the Umted States Pharmacopeia J National Formula ... 

Ascorbic acid, calcium ascorbate, sodium ascorbate... 

Ester-d is a patented pharmaceutical grade material consisting of calcium ascorbate and calcium threonat Bsidie nsed trademark of Zila Nutraceuticals, Inc. 

For photographic use it is best to purchase either ascorbic acid or its isomer (mirror image) erythorbic acid. There are other perfectly legitimate forms of Vitamin C that are not legitimate for photo use, such as calcium ascorbate, especially if it is to be dissolved in propylene glycol or triethanolamine. 

Calcium Ascorbate occurs as a white to slightly yellow, crystalline powder. It is soluble in water, slightly soluble in alcohol, and insoluble in ether. The pH of a 1 10 aqueous solution is between 6.8 and 7.4. 

V(acac)3 has several applications, including its use as a component in olefin polymerization catalysts it is air sensitive, undergoing gradual oxidation in moist air to give VO(acac)2. Commercial V(acac)3 is allowed to contain not more than 2.0 wt% of VO(acac)2. Several spectroscopic techniques, such as IR, ESR and NMR, have been used to study the structure and properties of V(acac)3. IR and H NMR spectrometries were used effectively for determination of VO(acac)2 in V(acac)3 however, IR showed lower LOD . FT-NIR spectroscopy was used for the determination of calcium ascorbate in blister packs, tablets, plastic bottles etc.. ... 

A simple and rapid method for the iodometric determination of microgram amounts of chromium(ni) in organic chelates is based on the oxidation of chromium(III) with periodate at pH 3.2, removal of the umeacted periodate by masking with molybdate and subsequent iodometric determination of the liberated iodate . Iodometric titration was also used for determination of the effective isoascorbate (see 2) concentration in fermentation processes . The content of calcium ascorbate can be determined with high sensitivity by complexometric titration with edta, which is superior to iodometry. The purity of /3 -diketonate complexes of Al, Ga, In and Ni was determined by complexometric titration with edta at pH 5.5-3, with RSD < 0.01 for determining 5-30% metal ion. Good analytical results were obtained by a similar procedure for the metal content of 15 lanthanide organic complexes. ... 

Yuwono, M. Ebel, S. Determination of fluoride impurities in calcium ascorbate. Comparison of gas chromatography and ion selective electrode potentiometry. Arch. Pharm. 1997, 330, 348-352. 

Ascorbic acid ascorbyl palmitate calcium ascorbate. 

El 60 Carotenoids, Alpha-, Beta-, Gamma-carotene 192 E302 Calcium Ascorbate 660... 

Crystal structures of L-ascorbic acid varying from coarse to ultrafine powder constitute the major commercial product forms of the compound, followed by special coated and granulated forms. Sodium L-ascorbate is also produced in granular and powder forms. Limited production of other forms such as calcium ascorbate and ascorbyl palmitate depend on demand of these products in specialty use applications. 

Figure 4.3. Raman spectra of calcium ascorbate with progressively shorter integration times and narrower entrance slit. The observed SNR for the 1548cm peak is indicated and illustrates the visual appearance of the spectrum for various SNR.

Figure 4.4. Three spectra of calcium ascorbate at various measurement times. Improvement in SNR with longer integration time is due mainly to decreased shot noise, as stated in Eq. (4.6).

Figure 8.7. Spectra of calcium ascorbate acquired with a Chromex 2000 spectrometer, 25 mm detector, and three different gratings. Each spectrum is a single CCD exposure using the indicated gratings. Intensity scales differ in the three cases.

Observation of a material similar to the samples of interest, as a secondary standard. In this example, calcium ascorbate was selected as a stable, reliable material similar to the samples of interest. One of the ASTM standards could also be used for qualification if convenient. 

The example is illustrated by the results of Table 10.5. The Raman shift range from 400 to 2000 cm was calibrated with the 4-acetamidophenol shift standard, and the calibrated spectrum was recorded and stored on disk. Then calcium ascorbate was observed, with and without recalibration between spectra. Finally, spectra of calcium ascorbate were obtained approximately daily (each after recalibration) over a period of 2 months. The 769- and 1582 cm peaks were chosen for analysis, and their peak frequencies were determined by a center-of-gravity criterion included in the data analysis software (GRAMS 32). It is important that these qualification spectra duplicate the instrumental conditions to he used for real samples, at least as far as optical geometry, sampling mode, and calibration procedure. The objective is to provide an accurate indication of instrument performance in the intended application. 

Sample Solid Calcium Ascorbate 767-band (cm ) 1582-band (cm )... 

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