All chemicals were used as received and were
of analytical grade. Acrylamide (AAm), κ-carrageenan, N,N′-methylenebisacrylamide (MBAA),
and tartrazine were purchased from Sigma-Aldrich. LAP was synthesized
in our laboratory. Lithium phenyl-2,4,6-trimethyl-benzoyl phosphinate
(LAP) was synthesized using a recognized method.41 (link) Briefly, 2.85 mL of dimethyl phenylphosphonite was allowed
to react with 3.00 mL of 2,4,6-trimethylbenzoyl chloride in a covered
flask for 18 hours under a nitrogen blanket with stirring. After 18
hours, 100 mL of 6.25% (w/v) lithium bromide in 2-butanone solution
was added to the flask. The mixture was heated to 50 °C and then
allowed to react for 10 min. After cooling to room temperature, the
white precipitate was collected via vacuum filtration and washed with
four 100 mL aliquots of 2-butanone. Isolated LAP was dried in a vacuum
for one week to remove the residual solvent.
of analytical grade. Acrylamide (AAm), κ-carrageenan, N,N′-methylenebisacrylamide (MBAA),
and tartrazine were purchased from Sigma-Aldrich. LAP was synthesized
in our laboratory. Lithium phenyl-2,4,6-trimethyl-benzoyl phosphinate
(LAP) was synthesized using a recognized method.41 (link) Briefly, 2.85 mL of dimethyl phenylphosphonite was allowed
to react with 3.00 mL of 2,4,6-trimethylbenzoyl chloride in a covered
flask for 18 hours under a nitrogen blanket with stirring. After 18
hours, 100 mL of 6.25% (w/v) lithium bromide in 2-butanone solution
was added to the flask. The mixture was heated to 50 °C and then
allowed to react for 10 min. After cooling to room temperature, the
white precipitate was collected via vacuum filtration and washed with
four 100 mL aliquots of 2-butanone. Isolated LAP was dried in a vacuum
for one week to remove the residual solvent.
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