Determination of isoflavones in soybean flours, protein concentrates, and isolates

1982 ◽  
Vol 30 (2) ◽  
pp. 353-355 ◽  
Author(s):  
Arthur C. Eldridge
Keyword(s):  
Protein Concentrates

Quantitative Determination of Coumestrol in Dried Alfalfa and Alfalfa Leaf Protein Concentrates Containing Chlorophyll

1975 ◽  
Vol 58 (5) ◽  
pp. 983-986
Author(s):  
Benny E Knuckles ◽  
Raymond E Miller ◽  
E M Bickoff
Keyword(s):  
Quantitative Determination ◽  
Analytical Method ◽  
Leaf Protein ◽  
Improved Method ◽  
Alcohol Extract ◽  
Protein Concentrates ◽  
Coefficients Of Variation ◽  
Lower Standard ◽  
Alfalfa Leaf

Abstract An improved analytical method for the determination of coumestrol in dried alfalfa and leaf protein concentrates is described. In this method, chlorophyll is removed from an alcohol extract prior to the paper chromatographic-fluorometric measurement of coumestrol. Ninety-eight per cent of the coumestrol added to alfalfa leaf protein concentrates is recovered by this method. This improved method gives replicate values with lower standard deviations and coefficients of variation than the literature method.

scholarly journals Determination of protein and reactive lysine in leaf-protein concentrates by dye-binding

1979 ◽  
Vol 42 (3) ◽  
pp. 445-454 ◽  
Author(s):  
Ann F. Walker
Keyword(s):  
Convenient Method ◽  
Nutritional Value ◽  
Tungstic Acid ◽  
Leaf Protein ◽  
Processing Conditions ◽  
Acid Orange ◽  
Protein Concentrates ◽  
Dye Binding ◽  
Available Lysine

1. Twenty leaf-protein concentrates (LPC), were produced from different crops and by different processes, the latter being designed to retain maximum nutritional value of the samples.2. The establishment of conditions for the use of CI Acid Orange 12 in a commercial dye-buffer reagent for the determination of protein and reactive (available) lysine in LPC was investigated.3. Values for protein by dye-binding correlated well with those for tungstic-acid-precipitated nitrogen (×6.25).4. Some LPC samples showed a loss of reactive lysine, the greatest loss being associated with the most severe processing conditions.5. For the LPC samples studied, dye-binding provided a convenient method for the concurrent determination of protein and reactive lysine.

Determination of Carotene and Xanthophyll in Alfalfa Protein Concentrates

1971 ◽  
Vol 54 (4) ◽  
pp. 769-772
Author(s):  
B E Knuckles ◽  
S C Witt ◽  
R E Miller ◽  
E M Bickoff
Keyword(s):  
Protein Concentrate ◽  
Protein Concentrates ◽  
Aoac Method

Abstract Methods for the determination of carotene and xanthophyll in dried protein concentrates prepared during the wet fractionation of alfalfa have been studied. The AOAC method for carotene and xanthophyll in dried forages, 39.018–39.023 (11th Ed.), proved most satisfactory for analysis of the dried whole juice. The modification of a method developed earlier in this laboratory for dried forages proved most effective for analysis of a protein concentrate, high in xanthophyll and carotene, prepared from the whole juice. The modified procedure gave significantly higher values for carotene and xanthophyll in this protein-xanthophyll concentrate than the AOAC method.

Determination of Isopropyl Alcohol in Fish Protein Concentrate by Solvent Extraction and Gas–Liquid Chromatography

1967 ◽  
Vol 24 (7) ◽  
pp. 1521-1529 ◽  
Author(s):  
R. G. Ackman ◽  
H. J. Hingley ◽  
H. E. Power
Keyword(s):  
Chromatographic Analysis ◽  
Methyl Acetate ◽  
Isopropyl Alcohol ◽  
Gas Liquid Chromatography ◽  
Protein Concentrate ◽  
Fish Protein ◽  
Protein Concentrates ◽  
Liquid Chromatographic Analysis ◽  
Liquid Chromatographic

The isopropyl alcohol residues in fish protein concentrates prepared with this solvent can be determined by a hot extraction technique employing methyl acetate as the solvent and gas–liquid chromatographic analysis of the extract. Studies on vacuum stripping of fish protein concentrates and analysis of various samples suggest that the isopropyl alcohol is trapped mechanically inside particles because of formation of an impervious shell during drying.

A method for determination of unoxidized and total methionine in protein concentrates, with special reference to fish meals

1980 ◽  
Vol 43 (2) ◽  
pp. 339-348 ◽  
Author(s):  
L. R. Njaa
Keyword(s):  
Special Reference ◽  
Colorimetric Method ◽  
Cadmium Acetate ◽  
Barium Hydroxide ◽  
Protein Concentrates ◽  
Titanium Trichloride ◽  
Good Agreement

1. An automated colorimetric method for determination of methionine using an iodoplatinate reagent is described. Methionine sulphoxide does not react under the chosen conditions.2. The method may be used to distinguish between unoxidized and total methionine by doing one deter- mination without and one determination with previous reduction of a portion of the sample with titanium trichloride. Methionine sulphoxide is then obtained by difference.3. The method has been used with protein concentrates, mainly fish meals, after hydrolysis with barium hydroxide. Interference from cysteine-cystine is eliminated by adding a small amount of cadmium acetate to the sample before hydrolysis.4. Results obtained for total methionine and for methionine sulphoxide by independent methods show good agreement with results obtained with the iodoplatinate method.

scholarly journals Short communication: Determination of the whey protein index in milk protein concentrates

2019 ◽  
Vol 102 (9) ◽  
pp. 7760-7764 ◽  
Author(s):  
Zhengtao Zhao ◽  
Milena Corredig ◽  
Zafir Gaygadzhiev
Keyword(s):  
Whey Protein ◽  
Milk Protein ◽  
Short Communication ◽  
Protein Concentrates
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