title: Lichenysin, a cyclooctapeptide occurring in Chinese liquor jiannanchun reduced the headspace concentration of phenolic off-flavors via hydrogen-bond interactions.
abstract: Nonvolatile compounds play important roles in the quality of alcoholic beverages. In our previous work, a type of cyclooctapeptide lichenysin was newly identified in Chinese strong-aroma type liquor. In this work, it was found that lichenysin could selectively affect aroma volatility in strong-aroma type (Jiannanchun) liquor. Interaction of lichenysin and volatile phenolic compounds (off-odors in strong-aroma type liquor) was characterized using headspace solid-phase microextraction coupled with gas chromatography-mass spectrometry (HS-SPME-GC-MS). HS-SPME results indicated that lichenysin very efficiently suppressed the volatility of phenolic compounds by 36-48% (P < 0.05). Thermodynamic analysis showed that the binding process was mainly mediated by hydrogen bonding. Furthermore, the mixture of lichenysin and 4-ethylguaiacol revealed intermolecular cross peaks between the aH (Val) of lichenysin and the 1H of 4-ethylguaiacol, by using nuclear Overhauser effect spectroscopy. This study will help to further understand the interaction mechanisms between flavor and nonvolatile matrix components in Chinese liquors.
authors: State Key Laboratory of Food Science and Technology, Synergetic Innovation Center of Food Safety and Nutrition, Key Laboratory of Industrial Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University , 1800 Lihu Avenue, Wuxi, Jiangsu 214122, China.
authors: Rong
authors: R
authors: Zhang
authors: Qun
authors: Q
authors: Wu
authors: Yan
authors: Y
authors: Xu
mesh_terms: D005421:Flavoring Agents / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D006860:Hydrogen Bonding; D008074:Lipoproteins / Q000737:chemistry*; D009812:Odorants / Q000032:analysis; D010456:Peptides, Cyclic / Q000737:chemistry*; D010636:Phenols / Q000737:chemistry*; D013649:Taste; D014920:Wine / Q000032:analysis*
chemical_list: D005421:Flavoring Agents; D008074:Lipoproteins; D010456:Peptides, Cyclic; D010636:Phenols; C094325:lichenysin A
keywords: aroma volatility; hydrogen-bond interaction; lichenysin; phenolic off-flavors