hai
the hydrolysate of water soluble vitamins prefer to store at chiller or -20 degree celcius befroe hplc injection?
since the extraction of water soluble vitamins take a whole day, therefore hard to make an injection in same day.
so everybody got any suggestion
tq very much
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#2
mdfenko
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Posted 03 March 2009 - 11:12 AM
we never did anything more than chill them on ice. most are stable at room temperature.
talent does what it can
genius does what it must
i do what i get paid to do
genius does what it must
i do what i get paid to do
#3
Paraboxa
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Posted 04 March 2009 - 02:20 AM
Just wondered what extraction process you use for the water soluble vits and what sample you are analysing (blood, urine, fresh fruit?). I thought the stability of e.g. Vit C in blood was in the order of 3 hours.
How does the HPLC method compare against DCIP titration?
How does the HPLC method compare against DCIP titration?
#4
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Posted 05 March 2009 - 03:52 AM
one of the journal got mention that the extractant can store at frozen stage.
but i afraid that in frozen stage the water soluble vitamins will degrade.
but i afraid that in frozen stage the water soluble vitamins will degrade.
#5
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Posted 11 March 2009 - 01:34 AM
my sample is coconut meat. i using the acid and enzyme hydrolysis.
after the hydrolysis, any clean up procedure required?
should i defat the sample first?
i simultaneous analyze the vitamin b1, b2, b3, b6 and c.
so i don't the different between the DCPIP and HPLC.
tq
after the hydrolysis, any clean up procedure required?
should i defat the sample first?
i simultaneous analyze the vitamin b1, b2, b3, b6 and c.
so i don't the different between the DCPIP and HPLC.
tq
#6
mdfenko
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Posted 12 March 2009 - 11:54 AM
mimosa, on Mar 11 2009, 03:34 AM, said:
my sample is coconut meat. i using the acid and enzyme hydrolysis.
after the hydrolysis, any clean up procedure required?
should i defat the sample first?
after the hydrolysis, any clean up procedure required?
should i defat the sample first?
talent does what it can
genius does what it must
i do what i get paid to do
genius does what it must
i do what i get paid to do
#7
Paraboxa
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Posted 17 March 2009 - 02:04 AM
should i defat the sample first?[/quote]
Do you run with a guard column or is it sample straight onto column? I'd at least use a guard column to protect the analytical column.
Do you run with a guard column or is it sample straight onto column? I'd at least use a guard column to protect the analytical column.
#8
mimosa
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Posted 08 April 2009 - 06:34 PM
i never use the guard column.
but i think better defat the sample because i observed the fat obtained in the hydrolysate.
then i cleaned up the sample with sep-pak c18 under gravity.
but the vitamins was retained in the sep-pak.
so, what should i do to solve the problem?
my brain is freezed, right now still cannot figure out the ways...
anybody got the opinions?
or who was done this experiment before?
if you don't mind then can send me you protocol?
thank you very much
but i think better defat the sample because i observed the fat obtained in the hydrolysate.
then i cleaned up the sample with sep-pak c18 under gravity.
but the vitamins was retained in the sep-pak.
so, what should i do to solve the problem?
my brain is freezed, right now still cannot figure out the ways...
anybody got the opinions?
or who was done this experiment before?
if you don't mind then can send me you protocol?
thank you very much
