Determination of Metallic Copper in Cuprous Oxide-Cupric Oxide Mixtures

Baker, Irvin; Gibbs, R. Stevens

doi:10.1021/i560150a014

Cited by 7 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Even if some portion of the copper oxide product is CU2O (red in color), this material is most likely covered with a CuO coating, thus giving the black appearance and chemical characteristics of unavailable CuO particles. It would be desirable to confirm the proportion of each oxide species in products like FG copper oxide by analytical methodology as described by Baker and Gibbs (1946) and Namiki and Hirokawa (1979). However, the bioassay system employed herein could be used to estimate the proportion of CuO and Q12O in a mixture of these two salts.…”

Section: Experiments 2 Andmentioning

confidence: 99%

Bioavailability of Copper in Analytical-Grade and Feed-Grade Inorganic Copper Sources when Fed to Provide Copper at Levels Below the Chick’s Requirement

Aoyagi

Baker

1993

Poultry Science

View full text Add to dashboard Cite

Young chicks were fed a casein-soy protein concentrate basal diet (.56 mg Cu/kg) containing graded levels of added Cu (0, .5, 1.0 mg/kg) from analytical-grade (AG) CuSO4.5H2O, Cu2O, CuO, CuCO3.Cu(OH)2, CuCl, and also from feed-grade (FG) CuSO4.5H2O and FG-CuO. Weight gain, hematocrit, hemoglobin, plasma Cu, liver Cu, gall bladder (bile) Cu, and tendon lysine were assessed to determine whether dose-dependent Cu responses would occur. Gall bladder Cu concentration as well as total Cu content of the gall bladder were found to be linear functions of supplemental Cu intake. Common-intercept multiple linear regression (slope-ratio) of bile Cu concentration regressed on supplemental Cu intake indicated Cu bioavailability values (relative to the standard, AG-CuSO4.5H2O, set at 100%) of 97.9% for AG-Cu2O, 93.5% for FG-CuSO4.5H2O, and 112.9% for AG-CuCO3.Cu(OH)2. These values were not different (P > .05) from 100%. Relative bioavailability of Cu in AG-CuCl was 142.5%, which was different (P < .05) from the standard. Both AG-CuO and FG-CuO gave Cu bioavailability estimates not different (P > .05) from zero. The results indicate that when Cu levels are fed below the chick's requirement, bile Cu concentration is a sensitive indicator of net gut absorption of Cu.

show abstract

Section: Experiments 2 Andmentioning

confidence: 99%

Bioavailability of Copper in Analytical-Grade and Feed-Grade Inorganic Copper Sources when Fed to Provide Copper at Levels Below the Chick’s Requirement

Aoyagi

Baker

1993

Poultry Science

View full text Add to dashboard Cite

show abstract

“…The quantitative determination of the unknown sample may be carried out by determining the size and the ratio of the two segments of the curve (h~ and h2): The method which gives the best results in the presence of copper(I) and (copper(II) oxide is the Baker and Gibbs method [50,51]. This method involves the following steps:…”

Section: Quantitative Analysismentioning

confidence: 99%