Reference

GRAS status of copper gluconate, copper sulfate, cuprous iodide, and peptonized copper

GRAS status of copper gluconate, copper sulfate, cuprous iodide, and peptonized copper. (United States Food and Drug Administration, Rockville, MD 20857, USA). Fed. Regist., 49(114), 24118-19, (English) 12 Jun 1984. CODEN: FEREAC. ISSN: 0097-6326. DOCUMENT TYPE: Journal CA Section: 17 (Food and Feed Chemistry) CuSO4, CuI, and cupric gluconate [527-09-3] are generally-recognized-as-safe (GRAS) as direct ingredients of food, under the Federal Food, Drug, and Cosmetic Act. CuSO4 is used as a nutrient supplement and processing aid, and may be used in infant formulas. Cupric gluconate is used as a nutrient supplement and synergist, and may be used in infant formulas. CuI may be used at ￡0.01% in table salt as a source of I. Peptonized Cu is not GRAS.

Fourier transform infrared spectroscopic studies on the interaction between copper(II), amino acids and marine solid particles

Fourier transform infrared spectroscopic studies on the interaction between copper(II), amino acids and marine solid particles. Wang, Xiulin (Dep. Chem., Fudan Univ., Shanghai 200433, Peop. Rep. China). Analyst (London), 117(2), 165-71 (English) 1992. CODEN: ANALAO. ISSN: 0003-2654. DOCUMENT TYPE: Journal CA Section: 61 (Water) Section cross-reference(s): 78 FTIR spectroscopy was used to characterize the interaction between CuII, amino acids (AAs) and solid particles in seawater. Ion exchange between CuII and marine solid particles causes a stepwise change in the n(OH) band of surface H-bonding hydroxyl groups with increase of CuII, at room temp. The bands of the -COO- and -NH3+ vibrational modes of adsorbed AA and CuII-AA surface complexes in a solid matrix were isolated from the overlapping solid particle matrix by the spectral subtraction approach. With respect to the free AA, n(NH3+) and d(NH3+) of the adsorbed AA shift 10-39 and 13-49 cm-1, resp., toward higher and lower frequencies, whereas the variation of n(COO-, as) and n(COO-, s) is <4 cm-1, nearly equal to the resoln. 7440-50-8 and 527-09-3 are also in the experiment. of the IR spectrometer. The data indicate the surface hydroxyl group assocs. with the amino group of the amino acid in a solid matrix rather than with the carboxyl group. The n(NH3+) and d(NH3+) of the CuII-AA surface complex in the solid matrix shift 16-27 and 34-42 cm-1, resp., toward higher and lower frequencies, indicating that as a bridging reagent, the AA joins CuII and the surface hydroxyl group, resp., through the amino group and the carboxyl group to form a Model II ternary surface complex (TSC). The IR bands at 287-360 cm-1, due to the Cu-O stretching mode, were detected and confirmed the formation of the TSC between CuII, AAs and marine solid particles. .