Matrine and oxymatrine
are mainly obtained from
Sophora flavescens
using the high-temperature and
prolonged solvent extraction methods currently employed in industries.
In this study, an ultrafast and highly efficient method for extracting
matrine and oxymatrine from
S. flavescens
at room temperature using laser technology, specifically, laser
extraction, was demonstrated. The laser extraction rates for matrine
and oxymatrine from
S. flavescens
at
room temperature for 1 min were 266.40 and 936.80 mg(g·h)
−1
, respectively. These rates were 1400 times higher
than those achieved with conventional solvent extraction. These results
mean that 1 min of laser extraction is equivalent to 24 h of solvent
extraction. The reason for such a high efficiency is that laser-induced
cavitation can accelerate the rapid release of alkaloid molecules
in plant cells. Mass spectrum, nuclear magnetic resonance, and Fourier-transform
infrared spectrum analyses of the extracted matrine and oxymatrine
compounds confirmed that they are the same as the products of solvent
extraction. Furthermore, it was found that the anticancer activity
of laser-extracted compounds is slightly better than that of conventionally
solvent-extracted ones, likely due to the slight change in the microstructure
or conformation of these compounds under laser irradiation. These
findings demonstrated that the laser extraction method was ultrafast
and highly efficient, unveiling a novel approach to alkaloid extraction.
This discovery will have significant implications for the extraction
and utilization of alkaloids from plants.