Microbiological Determination of Methionine in Proteins and Foods

Mj, Horn; Db, Jones; Ae, Blum

doi:10.1016/s0021-9258(17)35009-3

Cited by 36 publications

(4 citation statements)

References 9 publications

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“…On the basis of 21.5% theoretical sulfur content in methionine, the recovery by the magnesium nitrate method was 91.4 ± 1.2% standard deviation, whereas that by the nitric-perchloric acid method was 97.7 ± 0.5% standard deviation. No such discrepancy, however, was found in the results for casein by the two methods, although the sulfur of this material is about 80% methionine (4). McChesney and Banks (5) obtained for methionine after 1-hour digestion in the perchloric acid phase, 99.2% recovery ± 3.9% standard deviation.…”

Section: Analyses Of Plant and Animal Tissuesmentioning

confidence: 81%

Sulfur Determination, Nitric-Perchloric Acid Oxidation for Sulfur in Plant and Animal Tissues

Shaw¹

1959

J. Agric. Food Chem.

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The available methods for the determination of total sulfur in plant and animal tissue were found to be either cumbersome or of low degree of precision. A simple procedure utilizing nitric and perchloric acid oxidation was developed, which gives precise and accurate results for sulfur comparable with those obtained by the AOAC magnesium nitrate method on a great variety of plant and animal products, and the amino acids, cystine, cysteine, and methionine. Sulfur recoveries in standard materials were within 2% of theory. The same sample preparation can serve for the determination of calcium, magnesium, potassium, sodium, and phosphorus, as well as sulfur. The sulfate was determined gravimetrically as barium sulfate, but the prepared solution can be adapted for the indirect flame spectrophotometric or any other desired method of sulfur determination.

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Section: Analyses Of Plant and Animal Tissuesmentioning

confidence: 81%

Sulfur Determination, Nitric-Perchloric Acid Oxidation for Sulfur in Plant and Animal Tissues

Shaw¹

1959

J. Agric. Food Chem.

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“…Table I shows the percentage of methionine content of the compounded poultry rations, procured from the local market. These results were compared to the estimated values obtained by the method of Horn et al (1946). It was observed that the values obtained by the two methods showed no significant differences.…”

Section: Estimation Of Methioninementioning

confidence: 92%

Estimation of methionine and cystine in compounded poultry rations

Datta¹

1974

J. Agric. Food Chem.

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“…Methionine. Methionine content was measured by according to Horn et al (1946). The liberated methionine gives a yellow color with nitro-prusside solution under alkaline condition and turn red on acidification.…”

Section: Methodsmentioning

confidence: 99%

Enhancing zinc availability in rice (Oryza sativa) grains by different zinc fertilization methods

et al. 2017

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In an experiment to study the effect of basal and foliar application of zinc on antinutrient and pronutrient compounds in rice grains (Oryza sativa) the observed results showed that a combination of basal and foliar application resulted in an increase in the zinc content of rice plants by almost 58% during 2009 and up to 55% during 2010, which was confirmed by the measurement of acid phosphatase, grain and straw zinc content of the rice genotypes. Moreover, phytic acid content was found to be reduced and methionine content was enhanced. In general it was observed that rice genotypes respond to zinc application positively and zinc availability was found to increase. Hence, it can be concluded that proper zinc fertilization can enhance the availability of zinc in rice grains.

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Microbiological Determination of Methionine in Proteins and Foods

Cited by 36 publications

References 9 publications

Sulfur Determination, Nitric-Perchloric Acid Oxidation for Sulfur in Plant and Animal Tissues

Sulfur Determination, Nitric-Perchloric Acid Oxidation for Sulfur in Plant and Animal Tissues

Estimation of methionine and cystine in compounded poultry rations

Enhancing zinc availability in rice (Oryza sativa) grains by different zinc fertilization methods

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