期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 63, 期 10, 页码 2668-2673出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf506221p
关键词
DFRC method; plant-based food; dietary fiber; lignin composition; monolignol
资金
- Carl-Zeiss Foundation
The derivatization followed by reductive cleavage (DFRC) method is a well-established tool to characterize the lignin composition of plant materials. However, the application of the original procedure, especially the chromatographic determination of the DFRC monomers, is problematic for low-lignin foods. To overcome these problems a modified sample cleanup and a stable-isotope dilution approach were developed and validated. To quantitate the diacetylated DFRC monomers, their corresponding hexadeuterated analogs were synthesized and used as internal standards. By using the selected-ion monitoring mode, matrix-associated interferences can be minimized resulting in higher selectivity and sensitivity. The modified method was applied to four low-lignin samples. Lignin from carrot fibers was classified as guaiacyl-rich whereas the lignins from radish, pear, and asparagus fibers where classified as balanced lignins (guaiacyl/syringyl ratio=1-2).
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