Adulteration process fractions

But by applying the process of fractional distillation to a sample, and determining the characters of numerous fractions, the actual number of available determinations may be, and frequently is, so largely increased that there is practically no chance of the adulterator being able to standardise his oils to meet all these figures. This proposition, of course, fails where it is possible to use a substance obtained from a cheaper source which is identical with one contained naturally in the oil, and which is added in such amount as not to materially exceed, in the total, the amount naturally occurring in the essential oil in question. 

Stable isotope ratio analysis (SIRA, GC-IRMS [Gas Chromatography-Isotope Ratio Mass Spectrometry], and Site Specific Isotope Fractionation — Nuclear Magnetic Resonance [SNIF-NMR]) have proven useful in many adulteration situations. In nature, and exist at relative proportions of 1.11 98.89 [27]. The photosynthetic process selectively enriches the plant in dependent upon the type of photosynthetic process used by the plant. Plants using the Hatch-Slack pathway (e.g., com, sugar cane, millet, and lemon grass) give 8 C values the closest to the standard, i.e., 5 C values of ca. -10. The 5 C value is calculated as ... 

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