Wet oxidation efficiencies of perchloric acid mixtures for various organic substances and the identities of residual matter

Martinie, Gary D.; Schilt, Alfred A.

doi:10.1021/ac60365a032

Cited by 120 publications

(42 citation statements)

References 13 publications

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“…Lactose was determined by enzymatic method using a Lactose/D-Galactose kit (R-Biopharm, Darmstadt, Germany). Calcium, potassium, magnesium and sodium and phosphorus contents were measured by Inductively Coupled Plasma (Vista-PRO CCD Simultaneous ICP-OES, VARIAN, Palo Alto, CA, USA) after high temperature (200-250°C) extraction with concentrated nitric and perchloric acids [15]. The element content was measured for Ca at 422.7 nm, K at 766.5 nm, Mg at 279.6 nm, Na at 589.0 nm and P at 213.6 nm.…”

Section: Dissolution Kinetics Of Powder Constituentsmentioning

confidence: 99%

Rehydration of high-protein-containing dairy powder: Slow- and fast-dissolving components and storage effects

Mimouni

Deeth

Whittaker

et al. 2010

Dairy Sci. Technol.

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-As dissolution of powdered milk proteins is necessary for the expression of their functional properties, it is regarded as a critical property by the dairy industry. However, milk proteins exhibit a progressive loss of solubility during storage in the dry form, especially in the case of high-protein-containing powders such as milk protein concentrate (MPC). To further understand the mechanisms responsible for this loss of solubility, the rehydration process of MPC powder before and after storage at 23% equilibrium relative humidity and 24°C for up to two months was studied. This work clearly showed that the storage-induced loss of milk protein powder solubility was due to changed rehydration kinetics and not to the formation of insoluble material in the course of storage. The concentrations of the various constituents of MPC (caseins, whey proteins, lactose, calcium, magnesium, phosphorus, sodium and potassium) were determined in the dispersed phase during the powder dissolution process. The results suggest that the release of micelles from powder particles is the rate-limiting step of the MPC rehydration process and is inhibited upon storage. In contrast, water penetration into the powder particles is shown not to be a rate-limiting factor as molecules larger than water (whey proteins and lactose) were freely released out of the powder structure in both fresh and aged MPCs.rehydration / dairy powder / milk protein / casein micelle / solubility Article published by EDP SciencesRésumé -Réhydratation d'une poudre laitière à haute teneur en protéines : effets du stockage et des composants à dissolution rapide ou lente. La capacité d'une poudre de protéines laitières à se solubiliser est déterminante pour l'expression des propriétés fonctionnelles des protéines, elle est donc cruciale du point de vue industriel. Pourtant, les protéines de lait subissent une perte progressive de solubilité au cours du stockage sous forme déshydratée, particulièrement dans le cas de poudres à haute teneur en protéines telles que les concentrés de protéines de lait (CPL). Pour mieux comprendre les mécanismes à l'origine de la perte de solubilité de ces poudres, leur processus de réhydratation a été étudié avant puis après un stockage de deux mois à 24°C sous une humidité relative de 23 %. Ce travail a clairement montré que la perte de solubilité induite lors du stockage était due à un ralentissement de la réhydratation et non à la formation de matériel insoluble. Les concentrations des différents constituants des CPL (caséines, protéines sériques, lactose, calcium, magnésium, phosphore, sodium, potassium) ont été mesurées dans la phase dispersée au cours de la réhydratation des poudres. Les résultats suggèrent que l'étape cinétiquement déterminante de la réhydratation des poudres de CPL est la libération des micelles de caséines dans la phase liquide. En revanche, la pénétration de l'eau dans les grains de poudres n'est pas un facteur limitant. En effet, des molécules plus volumineuses que l'eau (protéines sériques, lactose)...

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Section: Dissolution Kinetics Of Powder Constituentsmentioning

confidence: 99%

Rehydration of high-protein-containing dairy powder: Slow- and fast-dissolving components and storage effects

Mimouni

Deeth

Whittaker

et al. 2010

Dairy Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…This sample was weighed, dried at 60°C and analysed chemically for Cu, I, Se, and Co. For Cu, Se, and Co, samples were digested in nitric/perchloric acids before being determined by the methods of Martinie & Schilt (1976), Bryce et al (1995), and Heanes (1981) respectively. Iodine was determined by colorimetry after dry ashing by the method of Moxon & Dixon (1980).…”

Section: Methodsmentioning

confidence: 99%

Fortification of silage and hay crops with trace elements

Smith¹,

Morton

Longhurst

et al. 2006

New Zealand Journal of Agricultural Research

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Feeding out conserved hay or silage to animals over winter or in early spring is an integral part of New Zealand pastoral farming. However, the mineral content of conserved feed is usually below that of the original pasture, and is fed to stock at a time when their mineral requirements are high. During these periods, iodine and copper concentrations in pasture are marginal or deficient, exacerbating the problem. Three trials were laid down, two in Southland and one in the Waikato, looking at the uptake of copper (Cu), cobalt (Co), selenium (Se), and iodine (I) when applied in liquid form at various times between the shutting-up stage and harvesting of conserved silage and hay paddocks. Application times for the Southland trials were 4 weeks prior to cutting, 2 weeks prior to cutting, the same day as cutting and onto the windrow after cutting. Minerals applied and rates of application were Cu: 0, 0.5, 1 and 3 kg copper sulphate ha -1

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“…Herbage samples were collected monthly across set transects from each paddock and analysed for Mo by the method of Bingley (1963) and Cu, S, Zn, and Fe by a nitric perchloric digest (Martinie & Schilt 1976). In addition, samples were collected from the treated paddocks 1 and 7 days following the spray application in late June-July.…”

Section: Pasture and Animal Measurementsmentioning

confidence: 99%

“…Chemical properties of soil and herbage on the farms used in this study as at April Mo(Bingley 1963), Cu, S, Zn, Fe(Martinie & Schilt 1976).…”

mentioning

confidence: 99%

The effectiveness of copper fertiliser in maintaining the copper status of deer at moderate to high pasture molybdenum contents

Smith

Hawke

Morton

et al. 2006

New Zealand Journal of Agricultural Research

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Copper (Cu) deficiencies are an important concern of the New Zealand livestock industry, particularly for deer. Cu fertiliser application to pastures has been proven to be effective, providing the particle size is suitable and the pasture has low molybdenum (Mo) concentrations (<1 ppm). Afield study was set up to determine the effect of Cu fertiliser application on deer grazing pastures of moderate to high Mo concentrations (2-8 ppm). Mobs of deer (red × elk and red × wapiti weaners) grazed both Cu fertilised and non-fertilised paddocks on farms near Rotorua (pasture Mo 6-8 ppm) and in Southland

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Wet oxidation efficiencies of perchloric acid mixtures for various organic substances and the identities of residual matter

Cited by 120 publications

References 13 publications

Rehydration of high-protein-containing dairy powder: Slow- and fast-dissolving components and storage effects

Rehydration of high-protein-containing dairy powder: Slow- and fast-dissolving components and storage effects

Fortification of silage and hay crops with trace elements

The effectiveness of copper fertiliser in maintaining the copper status of deer at moderate to high pasture molybdenum contents

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