Ao Ling, Lian Xudong, Lin Wenxuan, Guo Ruonan, Xu Youqiang, Dong Wei, Liu Miao, Shen Caihong, Sun Xiaotao, Sun Baoguo, Deng Bo
Key Laboratory of Brewing Molecular Engineering of China Light Industry, Beijing Technology and Business University, Beijing 100048, PR China.
Beijing Laboratory of Food Quality and Safety, Beijing Technology and Business University, Beijing 100048, PR China.
Food Chem X. 2022 Jun 28;15:100379. doi: 10.1016/j.fochx.2022.100379. eCollection 2022 Oct 30.
Liquid-liquid extraction (LLE) is the most commonly utilized technique for the extraction of odor-active esters (OAEs) in strong-aroma types of Baijiu (SAB). However, since the contents of different OAEs in SAB vary widely, it is still a puzzle to ensure that all OAEs to be thoroughly extracted by LLE without the problem of saturated adsorption. Herein, a novel approach of magnetic solid phase extraction (MSPE), based on the magnetic graphene oxide nanocomposite modified with polyacrylamide (GO/PAM/FeO), was employed for the efficient extraction of six OAEs from SAB. Compared with LLE, GO/PAM/FeO exhibited highly selective recognition properties and larger adsorption capacities for OAEs (ranging from 13.68 to 39.06 mg/g), resulting in better extraction performances for OAEs. Coupled with GC-MS, six OAEs in real SAB were successfully determined, with recoveries ranged from 70.1 ∼ 90.0% and LODs at 0.08 ∼ 1.35 µg/L. Overall, the MSPE-GC/MS is a promising alternative for accurate determination of OAEs in SAB.
液液萃取（LLE）是提取浓香型白酒（SAB）中呈香酯类（OAEs）最常用的技术。然而，由于SAB中不同OAEs的含量差异很大，要确保通过LLE将所有OAEs彻底萃取出来且不存在饱和吸附问题仍是一个难题。在此，基于用聚丙烯酰胺改性的磁性氧化石墨烯纳米复合材料（GO/PAM/FeO），采用了一种新型的磁性固相萃取（MSPE）方法，用于从SAB中高效萃取6种OAEs。与LLE相比，GO/PAM/FeO对OAEs表现出高度选择性识别特性和更大的吸附容量（范围为13.68至39.06 mg/g），从而对OAEs具有更好的萃取性能。结合气相色谱 - 质谱联用（GC - MS），成功测定了实际SAB中的6种OAEs，回收率在70.1%至90.0%之间，检测限为0.08至1.35 μg/L。总体而言，MSPE - GC/MS是准确测定SAB中OAEs的一种有前景的替代方法。
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