Survey of Residue Levels of Organic Solvents in "Existing Food Additives" and Health Food Materials by Head-space GC

Uematsu, Yoko; Ogimoto, Mami; Suzuki, Kumi; Kabashima, Junichirou; Ito, Koichi; Nakazato, Mitsuo

doi:10.3358/shokueishi.49.366

Cited by 5 publications

(1 citation statement)

References 6 publications

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“…Also, methanol was detected in heat-treated green tea leaves. The exposition of raw materials to high temperatures must be minimized, as methanol is similarly formed. , Found within the natural volatile components of green tea leaves and present in different botanical raw materials, the maximum concentration of methanol is 0.3% in the finished product according to the ICH guideline . Furfural was also identified as a defect in the heat-treated green tea leaves.…”

Section: Results and Discussionmentioning

confidence: 99%

Authentication of Commercial Powdered Tea Extracts (Camellia sinensis L.) by Gas Chromatography

Inarejos-García¹,

Helbig²,

Klette³

et al. 2021

ACS Food Sci. Technol.

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The popularity and increasing demand for botanicals are correlated with the growth of nutraceuticals and new functional products on the market. Unfortunately, also fraudulent practices are increasing. In quality control, standardized powdered tea extracts (Camellia sinensis L. Kuntze) are usually analyzed by colorimetry or liquid chromatography. A complementary gas chromatographic method was explored for its potential to deliver characteristic volatile profiles. Nineteen commercially available powdered tea extracts of different standardizations were compared with certified tea leaves. Experiments under different preprocessing and processing conditions showed that raw material temperature and storage can affect the volatile composition. Severe adulteration and falsification issues were identified. Some commercial products did not show the characteristic Camellia sinensis profile at all. Unexpected compounds, such as organic solvents, synthetic antioxidants, and intermediates of the catechin synthesis, were found in considerable amounts. The demonstrated volatile profiling of powdered tea extracts provided information on safety, authenticity, and product quality.

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Section: Results and Discussionmentioning

confidence: 99%