GB/T 14454.5-2008 PDF EnglishUS$85.00 · In stock · Download in 9 seconds
GB/T 14454.5-2008: Fragrance/Flavor substances -- Determination of optical rotation Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 14454.5: Historical versions
Similar standardsGB/T 14454.5-2008: Fragrance/Flavor substances -- Determination of optical rotation---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT14454.5-2008NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.100.60 Y 41 Replacing GB/T 14454.5-1993 Fragrance/Flavor substances - Determination of optical rotation (ISO 592:1998, Essential oils - Determination of optical rotation, MOD) ISSUED ON: JULY 15, 2008 IMPLEMENTED ON: NOVEMBER 01, 2008 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 5 2 Normative references ... 5 3 Terms and definitions ... 5 4 Reagents ... 6 5 Instruments ... 6 6 Operating procedures ... 7 7 Expression of results ... 8 8 Test report ... 8 Appendix A (Normative) Operating procedures of non-electronic polarimeters ... 10 Fragrance/Flavor substances - Determination of optical rotation1 ScopeThis Part of GB/T 14454 specifies the method for determining the optical rotation of fragrance/ flavor substances. This Part applies to the determination of the optical rotation of fragrance/ flavor substances. When the measured fragrance/ flavor substances are solid, semi- solid, or very viscous and dark in color at room temperature, use a solution of fragrance/ flavor substances to measure.2 Normative referencesThe terms in the following documents become the terms of this Part by reference to this Part of GB/T 14454. For dated references, all subsequent amendments (not including errata content) or revisions do not apply to this Part. However, parties to agreements that are based on this Part are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest edition applies to this Part. GB/T 14454.1, Fragrance/Flavor substances - Preparation of test samples (GB/T 14454.1-2008, ISO 356:1996, MOD)3 Terms and definitionsThe following terms and definitions are applicable to this Part of GB/T 14454. 3.1 Optical rotation Under the specified temperature conditions, when the polarized light whose wavelength is 589.3 nm ± 0.3 nm (equivalent to the D line of the natrium spectrum) passes through the fragrance whose thickness is 100 mm, the angle of rotation of the polarized light vibration plane, which is expressed in milliradians or degrees of angle. Note: If it is measured at different thicknesses, the optical rotation shall be converted to a value of a thickness of 100 mm. 3.2 Optical rotation in solution, so-called Specific rotation 5.4 Thermometer, the measuring range is 10 °C ~ 30 °C; the division scale is 0.2 or 0.1 °C. 5.5 Constant temperature controller, it is used to control the temperature of the sample at 20 °C ± 0.2 °C or other specified temperature. 6 Operating procedures 6.1 Sample preparation If it is necessary, dry the sample, in accordance with the provisions of GB/T 14454.1. When determining the specific rotation (see 3.2), the solution of the fragrance product shall be prepared according to the concentration and solvent (4.2) that are specified in the standards that are related to fragrance products. 6.2 Determination Turn on the light source (5.2) and wait for it to reach full brightness. If necessary, the temperature of the sample (6.1) can be adjusted to 20 °C ± 1 °C or other specified temperature1; then, inject the sample into the appropriate polariscope tube (5.3) at the same temperature. Under constant temperature control, start the water circulation; keep the polariscope tube at a specified temperature (± 0.2 °C) during the test. Fill the polariscope tube full of the sample; ensure that there are no bubbles in the tube. Put the polariscope tube into the polarimeter (5.1); read the right-handed (+) or left-handed (-) optical rotation of the fragrance according to the scale on the instrument. 6.3 Number of determinations For the same sample, measure at least three times. The difference of three measured values shall not be larger than 1.4 milliradians (0.08 °). Take the average of the three readings as the measured result. See Appendix A for the operating procedures of non-electronic polarimeters. 1 In general, the measurement shall be carried out at 20 °C. Exceptions are made in accordance with the provisions in the relevant fragrance product standards. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 14454.5-2008 be delivered?Answer: The full copy PDF of English version of GB/T 14454.5-2008 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 14454.5-2008_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 14454.5-2008_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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