Triterpenoid Saponins in Oat Bran and Their Levels in Commercial Oat Products
Posted on 2020-06-02 - 00:44
Oats
are commonly consumed as whole grains and generally considered
as a healthy food. However, the bioactive compounds in oats have not
been fully investigated. In this study, we reported for the first
time the purification, structure elucidation, and chemical profile
of the major triterpenoid saponins in oat bran as well as the quantification
of the major triterpenoid saponins in commercial oat products. Thirteen
triterpenoid saponins (1–13) were
purified from oat bran. Their structures were characterized by analyzing
their high-resolution mass spectrometry (MS), one-dimensional (1-D),
and two-dimensional (2-D) NMR spectra. All of the purified triterpenoid
saponins have been reported from oat bran for the first time, in which
compounds (1–8) are newly discovered
compounds and compound (9) is a new natural product.
Using ultra-high-performance liquid chromatography with tandem mass
spectrometry techniques, a complete profile of oat triterpenoid saponins
was established, and the contents of the 13 purified triterpenoid
saponins were quantitated in 19 different commercial oat products.
The total levels of the 13 triterpenoid saponins varied from 1.77
to 18.20 μg/g in these 19 products, in which oat bran (11 samples)
and oatmeal (three samples) had higher levels than cold oat cereal
(five samples). Among the 11 commercial oat bran samples, the average
total levels of the 13 triterpenoid saponins in the five sprouted
oat samples are slightly higher than those in the regular oat bran
products.
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Hu, Changling; Sang, Shengmin (2020). Triterpenoid Saponins in Oat Bran and Their Levels in Commercial Oat Products. ACS Publications. Collection. https://doi.org/10.1021/acs.jafc.0c02520
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