Paul W. Johns

Cholecalciferol encapsulation by caseinate hydrolysates in the presence of calcium and dihydrogen phosphate

Yi Ding, Chi Siang Ong, Dennis Ng, Qi Lin et autres

Abstract Vitamin D fortification of fluid milks and other foods has been an effective strategy for improving vitamin D deficiencies in European and North American populations. In efforts to facilitate this strategy, researchers have shown that many food proteins are capable of …

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Effects of redox active agents on cyanocobalamin stability in heated milk

Yi Ding, Pei Jun Lim, Jayler Goh, Qi Lin et autres

Summary Reducing agents and oxidizing agents have been identified as contributors to vitamin B12 losses associated with food processing and/or storage. We evaluated the effects of redox active agents on cyanocobalamin stability in heat‐treated non‐fat milk and neutral pH buffers. The largest …

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Effects of metal ions on cyanocobalamin stability in heated milk protein‐based matrices

Yi Ding, Li Yin Choy, Min Hui Chew, Qi Lin et autres

Summary Losses of vitamin B12 during the processing and/or storage of foods and supplements have been associated with both reducing and oxidising agents. We evaluated the effects of six redox active (Cu 2+ , Fe 2+ , Fe 3+ , Mn 2+ …

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Author response for "Effects of Metal Ions on Cyanocobalamin Stability in Heated Milk Protein‐Based Matrices"

Yi Ding, Li Yin Choy, Min Hui Chew, Lin Qi et autres

Determination of residual protein in commercial human milk oligosaccharides

Paul W. Johns

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Cocoa Flavanols Improve Vascular Responses to Acute Mental Stress in Young Healthy Adults

Rosalind Baynham, Jet Veldhuijzen Zanten, Paul W. Johns, Quang S. Pham et autres

Mental stress has been shown to induce cardiovascular events, likely due to its negative impact on vascular function. Flavanols, plant-derived polyphenolic compounds, improve endothelial function and blood pressure (BP) in humans, however their effects during stress are not known. This study examined …

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Glutamine and Asparagine in Nutritional Products

Paul W. Johns, Steven R. Hertzler

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Substantial Depletion of Vicine, Levodopa, and Tyramine in a Fava Bean Protein-Based Nutritional Product

Paul W. Johns, Steven R. Hertzler

A commercial fava bean protein isolate and a liquid nutritional product formulated with it were tested by validated HPLC methods for the favism-associated pyrimidine glycoside vicine, the dopamine precursor levodopa, and the biogenic amine tyramine. The vicine, levodopa, and tyramine concentrations in …

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Pink colour formation in hydrolysed casein

Paul W. Johns

Summary Pink discolouration in a casein hydrolysate prompted an investigation into its formation. When an aqueous solution of the hydrolysate was held at 110 °C, an intense red colour was generated, as was a strong sulphide odour. In a study of colour …

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Estimation of Degree of Hydrolysis of Protein Hydrolysates by Size Exclusion Chromatography

Yi Ding, Qi Lin, Paul W. Johns

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Author response for "Pink colour formation in hydrolysed casein"

Paul W. Johns

Dietary flavanols improve cerebral cortical oxygenation and cognition in healthy adults

Gabriele Gratton, Samuel R. Weaver, Claire V. Burley, Kathy A. Low et autres

Cocoa flavanols protect humans against vascular disease, as evidenced by improvements in peripheral endothelial function, likely through nitric oxide signalling. Emerging evidence also suggests that flavanol-rich diets protect against cognitive aging, but mechanisms remain elusive. In a randomized double-blind within-subject acute study …

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