Sample container with integrated internal reflection element
A sample container and internal reflection technology, applied in the field of ATR-FTIR spectroscopy analysis, can solve the problems affecting the sample absorbance curve and so on
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example 1
[0135] Example 1: Measuring Dairy Adulteration
[0136] Adulteration of dairy products is a major problem, particularly prevalent in developing and underdeveloped countries, mainly due to lack of monitoring and enforcement. As shown in "Development and Application of a Database of Food Ingredient Fraud and Economically Motivated Adulteration" by Moore et al. from 1980 to 2010, Journal of Food Science, 2012; 77: R108-16, milk powder is the second most popular food product after olive oil. the food most likely to be adulterated. Adulterants in milk powder range from harmless additions such as vegetable protein, whey, water or other types of milk to many harmful additions including melamine, hydrogen peroxide, caustic soda, urea and even paint.
[0137] Identification of target molecules (eg adulterants) in liquids (eg dairy) where the cap, sample receiving element of the present invention is used to obtain spectra of adulterated milk in the form of whole, semi-skimmed and skimm...
example 2
[0143] Example 2: Whiskey
[0144] Alcohol adulteration is another major issue with potentially life-threatening effects. Whiskey adulteration is a good example, where additives are common, as is fraudulent labeling of inferior products.
[0145] Such as Figure 10 As shown (spectrum obtained using a sample located on an IRE as part of the present invention, whiskey has a strong spectral fingerprint with clearly identifiable O-H bending and stretching peaks, and Contribution. Changes in this spectral signature are readily observed when the composition of the sample is changed.
[0146] Figure 11 A shows the unprocessed spectrum obtained from the sample on the IRE that is part of the present invention. The samples included were whiskeys spiked with varying amounts of water. Although small variations can be observed between the raw spectra of each dilution, in Figure 11 These changes are even more pronounced in the PCA scatterplot shown in B. Here, each stage of dilutio...
example 3
[0147] Example 3: Olive Oil Adulteration
[0148] As mentioned earlier, adulteration of olive oil is the most common case of food fraud to be detected. While only 10 percent of the olive oil produced qualifies as extra virgin, however, up to 50 percent is labeled as extra virgin. Often, high-quality oils are diluted with less expensive oils, including vegetable oils. The ability to detect this dilution using the present invention using high-throughput sampling methods can allow rapid screening of oils that may be adulterated.
[0149] Such as Figure 12 As shown (average untreated FTIR spectra of extra virgin olive oil (EVO), sunflower oil (SFO) and sesame oil obtained using the present invention), although food oils have strong spectral fingerprints, chemically these The oils differ in their relative monosaturated and polysaturated fat content, yet the raw spectra look very similar with only a very slight peak shift.
[0150] In theory, diluting extra virgin olive oil wit...
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