多元化学计量学结合感官组学探究古井贡酒中3种中链脂肪酸对酒体品质的影响

研究重点关注的中链脂肪酸是一类碳链长度为6-8个碳的脂肪酸(即:己酸、庚酸、辛酸)。有部分研究表明,中链脂肪酸对酒体品质具有重要影响,可能会对白酒中部分微量成分的香气表达造成影响。此外,中链脂肪酸还可以通过酯化反应,生成中链脂肪酸乙酯,进一步影响酒体品质。因此,研究中链脂肪酸对白酒风味品质的影响,对于优化白酒生产工艺、提高产品品质具有重要意义。基于上述,为探究古井贡酒中中链脂肪酸对酒体风味品质的作用,本研究采用化学计量学结合感官组学方法,明确了古井贡酒5种代表产品中中链脂肪酸含量分布,确证中链脂肪酸对酒体香气表达的贡献。结果表明,在5种代表性产品中,己酸在酒体中含量最高,为218.7±2.1~796.2±22.4 mg/L;庚酸的含量最低,为13.8±0.5~18.1±0.2 mg/L;辛酸相对处于中间水平,为22.4±0.9~29.7±0.05 mg/L。结合感官组学发现,己酸与所有的香气属性(除酸味)都呈负相关性,相关系数范围从-0.63到-0.89;庚酸与所有的香气属性(除奶酪味)都呈负相关性,相关系数范围从-0.82到-0.91;辛酸与香气属性之间的相关性较弱且不显著。综上,中链脂肪酸在适宜浓度时对酒体的香气具有显著贡献,这为原酒品质的定向调控、成品酒的勾调提供重要理论基础。

Research on Stoichiometry of Early-spring Herbs Functional Group in the Subtropical Artificial Wetland

[Objective]The aim was to carry out stoichiometry on the early-spring herbs functional group in subtropical artificial wetland.[Method]UV-Vis spectrophotometer was used for the determination of nitrate-nitrogen,ammonium nitrogen and phosphorus concentrations.Potassium persulfate absorptiometry was used for the measurement of total N content,while the flame photometer was used to detect the potassium and sodium concentration in plants.All the nutrient determination of plant samples were repeated for four times.[Result]The four nutrient concentrations in almost all samples were in the normal range of natural plant nutrition concentrations;in early-spring herbs functional groups,different species showed diversity on the nutrient concentrations;plant height had no significant effect on the nutrient concentrations in plants;the nutrient concentrations of non-grass group plants were higher than that of grass group plants;the nutrient concentrations of the annual herb were higher than that of perennial herbs.[Conclusion]The study had provided basis for the understanding of the effects of changes in nutritional conditions on species diversity,community structure and succession of the system.