T/GZTPA 0001-2020 Abolished Group standards

T/GZTPA 0001-2020 Determination of Main Chemical Components of Guizhou Green Tea by Near Infrared Diffuse Reflectance Spectroscopy

Publish Date: 2020-01-20 Implement Date: 2020-03-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/GZTPA 0001-2020

Standard Type: Group standards

Standard Status: Abolished

is_force_gb: no

CCS Name: Technical management

ICS Name: Terminology (principles and coordination and cooperation)

Publish Date: 2020-01-20

Implement Date: 2020-03-01

Scope

Scope: This standard specifies the requirements for the determination of moisture, water-soluble substances, total ash, tea polyphenols, total free amino acids, caffeine, gallic acid (GA), catechins (+C), epicatechins (EC), epigallocatechins (EGC), epicatechins gallate (ECG), and epigallocatechins gallate (EGCG) in Guizhou green tea by near-infrared diffuse reflectance spectroscopy. This standard is applicable to the rapid simultaneous determination of the main chemical components in Guizhou green tea in the near-infrared spectral region (12,800 cm-1 to 4,000 cm-1 or 780 nm to 2,500 nm). This standard is suitable for the rapid determination of the main chemical components in Guizhou green tea, but not for arbitration testing. Main technical content: There is a correlation between the changes in the content of sample components and their corresponding near-infrared spectra. By using diffuse reflectance to obtain the near-infrared diffuse reflectance spectra of the calibration sample set, selecting appropriate chemometric calibration methods, correlating the near-infrared diffuse reflectance spectra of the calibration sample set with their corresponding main chemical component contents, establishing a calibration model, and validating the effectiveness of the calibration model using the verification sample set. The main chemical component contents of the sample to be tested are calculated using the calibration model that has passed the application validation and the near-infrared diffuse reflectance spectra of the sample to be tested.