Our lab specializes in the identification and quantification of pesticides, microorganisms, allergens, and synthetic chemicals.


Essential Oils, extracts, absolute, CO2 extract, concrete for quantitative, qualitative, chirality, analysis, and purity.

Carrier Oils
Physical Constants

(optical rotation, specific gravity,
refractive index, colorimeter)

Our lab is committed to ensuring that we use only the most sensitive and reliable tools and processes. We know each test has limitations.


Gas Chromatography with Mass Spectrometry (GC-MS) is a method of separating the volatile compounds in essential oils into individual components and identifying each of these components and their percentages. This process is a common test used to identify essential oil adulteration and is the workhorse of APRC.


Enantioselective or Chiral GC-MS is similar to standard GC-MS testing, except that with a chiral column it is possible to specifically identify small differences in nearly identical molecules know as enantiomers. Chiral GC-MS is only applicable to chiral molecules and can assist in ensuring purity of essential oils.


One of the most commonly used essential oil tests is standard Gas Chromatography with flame ionization detection (GC-FID). This detection method adds to the quantitative ability of GC testing.


The combination of liquid chromatography with mass spectrometry (LC-MS) represents a powerful analytical tool for compound identification and quantification.


APRC has the latest in automated physical constant testing, including the following:

Optical Rotation

Optical rotation tests for chirality by measuring the amount of light bend produced by the orientation of the essential oil molecules to determine whether the molecular structure complies with the determined standard.

Specific Gravity

Measured using a densitometer, the specific gravity of an essential oil is the density of a particular oil in comparison with the density of water. Specific gravity readings are measured at precise temperatures and pressures, as temperature and pressure can impact the measurements. Particular oils have known ranges of specific gravity in which the oil is considered to be unadulterated and pure.

Refractive Index

The refractive index of an essential oil is a measurement that tests how the speed of light is altered when passing through the oil. An oil’s refractive index can be compared to that of a reliable sample.


This instrument is used to take the subjectivity out of color comparison and evaluation. A colorimeter is an instrument that compares the amount of light getting through a solution with the amount that can get through a sample of pure solvent. A colorimeter contains a photocell is able to detect the amount of light which passes through the solution under investigation.