Compositional differences among Chinese soy sauce types studied by (13)C NMR spectroscopy coupled with multivariate
Ghulam Mustafa Kamal1, Xiaohua Wang1, Bin Yuan1
1Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Centre for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
Talanta
|June 26, 2016
Summary
Carbon-13 Nuclear Magnetic Resonance ((13)C NMR) spectroscopy effectively differentiates soy sauce types by analyzing additives like glutamate and sucrose. This method overcomes limitations of (1)H NMR for metabonomic analysis of complex soy sauce mixtures.
Area of Science:
- Food Chemistry
- Metabonomics
- Analytical Chemistry
Background:
- Soy sauce exhibits diverse types globally, influenced by processing and additives.
- Metabonomic analysis of soy sauce is complex, with (1)H NMR facing signal overlap challenges.
- Differentiating soy sauce types requires advanced analytical techniques.
Purpose of the Study:
- To investigate metabonomic variations among different soy sauce types using (13)C NMR spectroscopy.
- To differentiate and quantify key additives in various soy sauce products.
- To establish a method for classifying soy sauce based on composition.
Main Methods:
- Application of (13)C NMR spectroscopy for metabonomic profiling.
- Utilizing multivariate statistical analysis, including Principal Component Analysis (PCA) and Orthogonal Partial Least Square-Discriminant Analysis (OPLS-DA).
- Analysis of soy sauce types: super light, super dark, red cooking, and mushroom soy sauce.
Main Results:
- (13)C NMR successfully distinguished and quantified glutamate, sucrose, and glucose.
- Higher sucrose concentrations in dark, red cooking, and mushroom soy sauces linked to caramel addition.
- Elevated glutamate levels in super light soy sauce suggest monosodium glutamate addition.
Conclusions:
- (13)C NMR-based metabonomics offers a robust method for soy sauce classification.
- The study demonstrates the potential for differentiating soy sauce based on additives, raw materials, and fermentation.
- (13)C NMR provides superior resolution for analyzing complex mixtures compared to (1)H NMR.
Related Concept Videos
01:162D NMR: Overview of Homonuclear Correlation Techniques
769
Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
COSY90 is the standard two-dimensional (2D) COSY experiment that...
769
01:062D NMR: Homonuclear Correlation Spectroscopy (COSY)
2.1K
Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
2.1K
01:14NMR Spectroscopy of Aromatic Compounds
6.6K
Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range.
6.6K
01:01Classification of Titrimetric Analysis Based on Reaction Types
2.0K
Titrimetric analysis in solution chemistry involves measuring the volume of solutions and is often called volumetric analysis. The standard solution of known concentration in the burette is called the titrant, whereas the solution of unknown concentration in the flask is called the analyte, or titrand. Titrimetric analyses can be classified into four types based on the reactions between the titrant and analyte.
Titrations between an acid and a base lead to neutralization reactions that form...
Titrations between an acid and a base lead to neutralization reactions that form...
2.0K
01:13¹H NMR: Complex Splitting
2.1K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
2.1K
01:26Spectroscopy of Carboxylic Acid Derivatives
3.2K
Infrared spectroscopy is primarily used to determine the types of bonds and functional groups. In carboxylic acid derivatives, a typical carbonyl bond absorption is observed around 1650–1850 cm−1. For esters, the absorption is recorded at around 1740 cm−1, while acid halides show the absorption at about 1800 cm−1. Another acid derivative, the acid anhydrides, exhibit two carbonyl absorption around 1760 cm−1 and 1820 cm−1, arising from the symmetrical and...
3.2K