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2 protocols using hexyl hexanoate

1

Standardized FAME and Alkane References

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Sulfuric acid, methanol, butylated hydroxytoluene (BHT), toluene, sodium chloride, anhydrous sodium sulfate, and diethyl ether were purchased from Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China). Hexyl hexanoate, fatty acid methyl ester (FAME), and alkane reference standards were purchased from J&K Chemical Ltd. (Shanghai, China). Margaric acid and ethyl caprate were purchased from Sigma-Aldrich (Steinheim, Germany).
Thirty-seven FAME reference standards with concentrations between 100 ng/mL and 200 ng/mL (C4–C24) were mixed, while FAME reference standards with carbon numbers of C16-C18 were prepared individually, and the purity was 98–99%. The alkane reference standards (C4–C40) were dissolved in chloroform with a concentration of 500 μg/mL.
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2

Synthesis and Analysis of Baijiu Flavors

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GO (98.0%) with a thickness of 0.7 ∼ 1.2 nm and sodium chloride (99.5%) were purchased from Yuanye Biological Reagent Co., Ltd. (Shanghai, China). Acrylamide (AM, 99.0%), ammonium persulfate (APS, 98.0%), N, N’-methylene bisAcrylamide (MBA, 98.0%), sodium hydroxide (NaOH, ≥ 96.0%), HPLC-grade dichloromethane (CH2Cl2, 99.9%), acetone (99.7%), ethyl acetate (99.9%), tetrachloromethane (CCl4, 99.5%), hexane (99.7%), and HCl solution (36.0%∼38.0%) were obtained from J&K Scientific Ltd. (Beijing, China). FeCl3·6H2O (99.5%), FeCl2·4H2O (99.95%), and ammonium solution (≥25.0% in H2O) were purchased from Aladdin Reagents Co., Ltd. (Shanghai, China). Ultrapure water was prepared through a Milli-Q system at 18.2 MΩ (Millipore, Bedford, MA).
The standards of ethyl pentanoate, ethyl hexanoate, propyl hexanoate, butyl hexanoate, ethyl octanoate, and hexyl hexanoate, with purities over 99%, were purchased from J&K Scientific Co., Ltd. (Beijing, China). 2H5-Ethyl pentanoate (IS1, ≥ 95%) and 2H5-propyl hexanoate (IS2, ≥ 95%) were used as isotope internal standards and obtained from Yuanye Biological Reagent Co., Ltd. (Shanghai, China). The stock standard solutions of each compound were prepared in ethanol and stored at 4 °C until analysis. A freshly prepared ethanol–water solution at 15% alcohol by volume (ABV) was used as a synthetic model of Baijiu.
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