Abstract
The hydrogen bonding was prone to be formed by many components in beer. Different sorts of flavor substances can affect the Chemical Shift due to their different concentrations in beer. Several key factors including 4 alcohols, 2 esters, 6 ions, 9 acids, 7 polyphenols, and 2 gravity indexes (OG and RG) were determined in this research. They could be used to investigate the relationship between hydrogen bonding intensity and the flavor components in bottled larger beers through the Correlation Analysis, Principal Component Analysis and Multiple Regression Analysis. Results showed that ethanol content was the primary influencing factor, and its correlation coefficient was 0.629 for Correlation Analysis. Some factors had a positive correlation with hydrogen bonding intensity, including the content of original gravity, ethanol, isobutanol, Cl−, K+, pyruvic acid, lactic acid, gallic acid, vanillic acid, and Catechin in beer. A mathematic model of hydrogen bonding Chemical Shift and the content of ethanol, pyruvic acid, K+, and gallic acid was obtained through the Principal Component Analysis and Multiple Regression Analysis , with the adjusted R2 being 0.779 (P = 0.001). Ethanol content was proved to be the most important factor which could impact on hydrogen bonding association in beer by Principal Component Analysis. And then, a multiple non-linearity model could be obtained as follows: \( hydrogen\,bonding\,association\,intensity\,(CS) = 4.917 + 0.002\left[ E \right] - 0.006\left[ P \right] + 5.141E - 8\left[ {{K^2}} \right] + 5.378E - 5\left[ {G \times P} \right] + 2.428E - 5\left[ {K \times P} \right] + 2.369E - 5\left[ {{E^2}P} \right] - 1.63E - 5\left[ {{G^3}} \right] - 2.207E - 5\left[ {{P^3}} \right] - 5.247E - 7\left[ {{K^2}P} \right] - 3.037E - 5\left[ {{E^2}K} \right] \). The average error was 1.23 % in the validated experiment.
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Abbreviations
- NMR:
-
Nuclear magnetic resonance
- PCA:
-
Principal component analysis
- MRA:
-
Multiple regression analysis
- HPLC:
-
High performance liquid chromatography
- AAS:
-
Atomic absorption spectrometry
- HS-GC:
-
Headspace gas chromatography
- FID:
-
Flame ionization detector
- RP-HPLC:
-
Reverse phase-high performance liquid chromatography
- OA:
-
Oxalic acid
- TA:
-
Tartaric acid
- CS:
-
Chemical shift
- IA:
-
Isoamyl alcohol
- OG:
-
Original gravity
- AD:
-
Alcohol degree
- RG:
-
Real gravity
- PA:
-
Pyruvic acid
- EA:
-
Ethyl acetate
- MA:
-
Malic acid
- LA:
-
Lactic acid
- SA:
-
Succinic acid
- AA:
-
Acetic acid
- KA:
-
Ketoglutaric acid
- TA:
-
Tartaric acid
- CA:
-
Citric acid
- GA:
-
Gallic acid
- VA:
-
Vanillic acid
- P-CA:
-
P-coumarilic acid
- FA:
-
Ferulic acid
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Acknowledgements
This study was financially supported by the program for New Century Excellent Talents in University of China (No. NCET-10-0453), National Basic Research Program of China (973 Program, No. 2010CB735706), the National High Technology Research and Development Program of China (No. 2012AA021303), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) and Program of Introducing Talents of Discipline to Universities (No. 111-2-06), the National High Technology Reseacrh and Development Program 863(No.2012AA012303), and National Science Foundation (31271919).
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Liu, C., Dong, J., Yin, X. et al. Influencing factors of hydrogen bonding intensity in beer. J Food Sci Technol 51, 2964–2976 (2014). https://doi.org/10.1007/s13197-012-0824-7
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DOI: https://doi.org/10.1007/s13197-012-0824-7