The invention discloses an
ultrasound-assisted preparation method of high strength
Gracilaria agar. The method includes: taking
Gracilaria as the
raw material, conducting intermediate-temperature low-alkaline treatment under intermittent assistance of
ultrasound,
ultrasound-assisted acidification, ultrasound-assisted bleaching and heavy
metal removal, carrying out gel boiling, filtering out impurities, performing cooling, extruding gel, conducting
dehydration,
drying, and smashing, and then passing the product through a 80-mesh
sieve, thus obtaining the high strength
Gracilaria agar. The invention adopts intermediate-temperature dilute alkaline treatment on Gracilaria, with NaOH assisted by ultrasound intermittently, so that the alkaline
treatment time is shortened, and simultaneously gel loss can be substantially reduced.
Ultrasound is employed to assist acidification of a
mixed solution of HCl, H2SO4, and C2H2O4, so that the acid consumption is substantially reduced, and the action time is short.
Ultrasound is adopted to assist a
mixed solution of NaClO, H2O2, and EDTA-Na2 to realize efficient bleaching, and at the same time,
heavy metals are removed from the
raw material, so that product color and
hygienic quality are guaranteed. The method provided in the invention makes use of ultrasound to assist preparation of Gracilaria
agar having high strength, good color, and excellent security, and is of great significance in enhancing the technical level of agar preparation and improving product comprehensive quality.