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Unravelling proton NMR spectra of foodstuffs with independent component analysis techniques

thumbnail image: Unravelling proton NMR spectra of foodstuffs with independent component analysis techniques

Overlapping signals in the proton NMR spectra of complex liquids, like foodstuffs and soft drinks, can be processed using a chemometric method, independent component analysis, to extract the spectra of pure components and determine their concentrations.

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Farmed salmon can contain pesticide residues, but nothing to worry about

thumbnail image: Farmed salmon can contain pesticide residues but nothing to worry about

Some salmon farmed in Europe contains low levels of pesticide residues, but not large enough to justify the campaign that labels it "the most contaminated foodstuff on the supermarket shelf."

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Latest comment

Actually, for me, pesticide residues in farmed fish are a concern.  When I eat farmed salmon (and I’ve tried several times), I get a severe stomach ache and I’m down for the count for at least half a day.  Wild salmon doesn’t bother me at all.  In fact, I quite enjoy it.

I can’t say if farmed salmon makes me ill because of pesticide residues or due to some other factor, but I wouldn’t discount the pesticides.

 

Thermal receipts expose us to bisphenol A: So what?

thumbnail image: Thermal receipts expose us to bisphenol A So what

Paper thermal receipts remain a prominent route of exposure for humans to the estrogenic chemical bisphenol A (BPA), but gloves can protect those who are occupationally exposed.

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Latest comment

The increase in BPA in the urine is more of a concern to the microorganisms at the waste treatment plant. BPA that is in the urine is unlikely to disrupt any endocrine function in the receipt handlers.

Inside the brains of jazz musicians

thumbnail image: Inside the brains of jazz musicians

When jazz musicians improvise with each other, they access the same parts of the brain that are used for speech, but the areas associated with semantics, that process the meaning of spoken language, are deactivated.

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Elements classify heroin from the "Golden" regions

thumbnail image: Elements classify heroin from the Golden regions

The contents of 12 elements along with seven elemental ratios have been used to assign more than 900 heroin samples to the Golden Triangle or the Golden Crescentby a procedure which is faster than analysing their organic compounds.

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Best spectroscopic technique for coffee typing

thumbnail image: Best spectroscopic technique for coffee typing

IR spectroscopy and LC/MS can differentiate between two coffee bean varieties using principal components analysis but CD and NMR spectroscopy both fail.

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Boost for old fingerprint technique

thumbnail image: Boost for old fingerprint technique

The conventional fingerprint imaging technique of photoluminescence has been modified by introducing a lysozyme-binding DNA species that eliminates background fluorescence and gives a more sensitive technique.

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Conflicting Turin shroud tests

thumbnail image: Conflicting Turin shroud tests

The news that the Bible may be wrong when it refers to people riding camels during the time of Christ reminded me of another biblical controversy, that surrounding the Turin shroud.

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Latest comment

The Shroud is a fascinating subject on so many levels scientifically, spiritually, and historically. For a great read, check out the new novel by an American author, "The Linen God" on Amazon.

 

Protecting citrus trees from the "green menace"

thumbnail image: Protecting citrus trees from the green menace

The greening disease Huanglongbiong which threatens citrus trees worldwide can be detected from the volatile biomarkers given off by the pathogen, even though there are no visible symptoms of infection.

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Indoor pyrethroids put children at risk

thumbnail image: Indoor pyrethroids put children at risk

The levels of pyrethroid insecticides on household floors correlate with those in the urine of infants in California, reflecting their increased use since organophosphate pesticides were banned.

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