The
application of the nanofiber film in the field of food preservation
was an emerging research direction in recent years. With the functionalization
of nanofibers, the quality and safety of food can be better guaranteed.
In the present work, thymol as an antibacterial agent was encapsulated
into poly(lactide-co-glycolide) to form core–shell
nanofibers by coaxial electrospinning. With such a core–shell
nanofiber film, thymol can be slowly released to headspace between
food and the nanofiber film, inhibiting the growth of bacteria on
the surface of food. The morphology and core–shell structure
of nanofibers were confirmed by scanning electron microscopy and transmission
electron microscopy. The antibacterial and fruit preservation abilities
of the nanofiber film were tested on strawberries. Studies have shown
that it can effectively inhibit the growth of bacteria, fungi, and
yeast and extend the shelf life of fruit. This novel antibacterial
packaging material with excellent biocompatibility, biodegradability,
and good sustained release performance would have a broad application
prospect in the field of food preservation.
DNA hydrogels have received considerable attention in analytical science, however, some limitations still exist in the applications of intelligent hydrogels. In this paper, we describe a way to prepare gel film in a capillary tube based on the thermal reversible principle of DNA hydrogel and the principle of capillary action. Because of the slight change in the internal structure of gel, its permeability can be increased by the addition of some specific targets. The capillary behavior is thus changed due to the different permeability of the hydrogel film. The duration time of the target solution flowing through the capillary tube with a specified length is used to quantify this change. With this proposed method, ultra-trace DNA hydrogel (0.01 μL) is sufficient to realize the sensitive detection of cocaine without the aid of other instruments, which has a low detection limit (1.17 nM) and good selectivity.
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