Comparison of Modified Automatic Dumas Method and the Traditional Kjeldahl Method for
Nitrogen Determination in Infant Food

Bellomonte, G; Costantini, Anna; Giammarioli, Stefania

doi:10.1093/jaoac/70.2.227

Cited by 22 publications

(19 citation statements)

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“…The moisture content in raw truffles was 637.8 g kg −1 in P juniperi , and 730.9 g kg −1 in T claveryi , which is in accordance with that obtained by other authors for T boudieri (777.0 g kg −1 ),3 T claveryi Chatin Gibaah (754.4 g kg −1 ),6 Tirmania nivea (752.7 g kg −1 ),6 T claveryi Chatin (780.0 g kg −1 ) 26. The moisture content of the samples increased with industrial processing (frozen and canned) in the samples studied.…”

Section: Resultssupporting

confidence: 91%

“…Desert truffles are a complex family of mycorrhizal hypogeous fungi, mainly containing species of the genera Balsamia , Picoa , Terfezia , Tirmania and Tuber , whose geographical distribution is limited to arid and semi‐arid areas,1 particularly in the Middle East and North Africa,2, 3 southern Europe4 (Spain, France, Italy and Greece), and other Mediterranean bordering countries (Libya,3 Tunisia, Syria), as well as in Iran, Iraq and Kuwait 5. The regions where desert truffles grow have a mean temperature of 17 to 24.1 °C and 127 to 360 mm of average annual rainfall 6, 7…”

Section: Introductionmentioning

confidence: 99%

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Effect of industrial processing on desert truffles Terfezia claveryi Chatin and Picoa juniperi Vittadini): proximate composition and fatty acids

Murcia¹,

Martínez‐Tomé²,

Vera³

et al. 2003

J Sci Food Agric

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Our objectives were to investigate the proximate composition of two desert truffles (Terfezia claveryi Chatin and Picoa juniperi Vittadini) and to determine the effects of freezing and canning on proximate composition. The moisture content of T claveryi and P juniperi was 730.9 g kg −1 and 637.8 g kg −1 respectively; ash was 42.5 g kg −1 and 82.1 g kg −1 respectively; protein was 159.5 g kg −1 and 225.4 g kg −1 respectively; lipids were 69.5 g kg −1 and 199.4 g kg −1 respectively; fibre was 83.2 g kg −1 and 130.4 g kg −1 respectively; and carbohydrates were 645.5 g kg −1 and 366.6 g kg −1 respectively. The fatty acids composition showed high quantities of linoleic acid 18:2 (45.4% in T claveryi and 53.0% in P juniperi), the rest of the fatty acids in decreasing order were 16:0 > 18:1 > 18:3 > 18 : 0 + 22 : 0 > 20 : 0 + 24 : 0 > 14 : 0 + 22 : 1 > 15 : 0 + 16 : 1 + 17 : 0 + 21 : 0 in T claveryi and 18 : 1 > 16 : 0 > 18 : 0 + 18 : 3 + 16 : 1 + 20 : 0+22:1 > 14:0 + 24:0 > 15:0 + 17:0 + 22:0 in the P juniperi. Little loss of ash, protein and lipids was observed as a result of industrial processing (p < 0.05).

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Effect of industrial processing on desert truffles Terfezia claveryi Chatin and Picoa juniperi Vittadini): proximate composition and fatty acids

Murcia¹,

Martínez‐Tomé²,

Vera³

et al. 2003

J Sci Food Agric

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“…Soil samples were collected from each block and pooled across all treatments for the initial test and across cultivars or planting time for the final test. Nitrogen was determined in samples by catalysed, high-temperature combustion (Dumas) using Method 7A5, as described by Bellomonte et al [23].…”

Section: Methodsmentioning

confidence: 99%

Changes in the Concentration of Leaf Nitrogen over the Season Affect the Diagnosis of Deficiency or Sufficiency in Strawberries in the Subtropics

Menzel

2018

Agriculture

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Optimum leaf nitrogen (N) concentrations have been identified for strawberry (Fragaria ×ananassa Duch.) in temperate and Mediterranean areas, but whether these values are appropriate for the subtropics is unclear. Two experiments were conducted for 2 years to determine if the seasonal changes in the concentration of leaf N affect the diagnosis of deficiency or sufficiency of strawberry plants in Queensland, Australia. In 2014, ‘Festival’, ‘Fortuna’, and ‘Winter Dawn’ were planted in early April and grown with and without N for the entire season. Then, ‘Festival’ was planted the following year in mid- or late April and, again, was grown with and without N. Yield was slightly lower with N in 2014, but higher with it the following year, particularly in the early planting. The concentration of total N in young, fully expanded leaves decreased from 3.0% to 2.0% as leaf, crown, and root dry weight increased, while the concentration of nitrate-N (NO3-N) decreased from 1200–3200 to 50–500 mg/kg. These changes in leaf N were large enough to affect the diagnosis of N deficiency or sufficiency. The concentration of leaf N was less variable than the concentration of leaf NO3-N and, therefore, better for estimating the nutrient status of strawberry plants in the subtropics.

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“…Nitrogen content was determined using a nitrogen analyzer (Leco FP-528; LECO, St. Joseph, MI, USA) based on the combustion method (modified Dumas method). The protein content was obtained from nitrogen by multiplication with the nitrogen protein conversion factor 5.95 (Bellomonte, Costantini, & Giamrioli, 1987).…”

Section: Protein Contentmentioning

confidence: 99%

Relationship between fatty acid composition and starch properties of 30 japonica rice cultivars

Nakamura

Katsura²,

Maruyama³

et al. 2018

Cereal Chem

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Background and objectives Although lipids are less abundant than carbohydrates and proteins in rice, they are important because they contribute to its nutritional, sensory, and functional qualities. In a previous study, we developed novel estimation formulae for starch properties on the basis of the iodine absorption curve or the pasting properties. The objectives of the present research are to characterize the fatty acid compositions of the various rice cultivars and to develop the estimation formulae for fatty acid contents based on the pasting properties. Findings We found that high degree of polymerization of amylopectin cultivars showed a high Pt, and a higher degree of unsaturated fatty acid (USF) (20:0, 20:1, 22:0 and 24:0) and low CD of amylopectin samples showed a high linoleic and linolenic acid content, while that of Pt and Cons showed a low value. Conclusions We developed novel estimation formulae for oleic and linoleic acid content based on pasting properties, and these equations showed determination coefficients (R2) of 0.75, and 0.68 for calibration and 0.65, and 0.76 for the validation test, respectively. Significance and novelty These formulae would be useful to select the promising rice cultivars in terms of biofunctionality, such as prevention of lifestyle diseases.

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Comparison of Modified Automatic Dumas Method and the Traditional Kjeldahl Method for Nitrogen Determination in Infant Food

Cited by 22 publications

References 0 publications

Effect of industrial processing on desert truffles Terfezia claveryi Chatin and Picoa juniperi Vittadini): proximate composition and fatty acids

Effect of industrial processing on desert truffles Terfezia claveryi Chatin and Picoa juniperi Vittadini): proximate composition and fatty acids

Changes in the Concentration of Leaf Nitrogen over the Season Affect the Diagnosis of Deficiency or Sufficiency in Strawberries in the Subtropics

Relationship between fatty acid composition and starch properties of 30 japonica rice cultivars

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