A device for detecting aldehydes or ketones comprising: a disk-shaped rotatable platform; and a microfluidic structure disposed on the rotatable platform, which comprises: a sample injection part suitable for injecting a fluidic sample containing the aldehydes or ketones and suitable for subjecting the aldehydes or ketones to 2,4-dinitrophenylhydrazine DNPH derivatization; a first microfluidic channel, being a siphon channel that is a passage suitable to allow the fluidic sample to move through the passage to a detection part and connects the sample injection part and the detection part; an eluent introduction part suitable for injecting an eluent; a second microfluidic channel that is a passage suitable to allow the eluent to move through the passage to the detection part and connects the eluent introduction part and the detection part; and the detection part coated with a substance capable of causing reaction with the aldehydes or ketones of the fluidic sample suitable to separate the aldehydes or ketones of the fluidic sample and to develop the aldehydes or ketones with the eluent, wherein upon rotation of the rotatable platform, the aldehydes or ketones injected into the sample injection part can be subjected to 2,4-dinitrophenylhydrazine DNPH derivatization; characterized in that the inside of the sample injection part is filled with 2,4-2,4-dinitrophenylhydrazine DNPH coated silica in the form of beads. a disk-shaped rotatable platform; and a microfluidic structure disposed on the rotatable platform, which comprises: a sample injection part suitable for injecting a fluidic sample containing the aldehydes or ketones and suitable for subjecting the aldehydes or ketones to 2,4-dinitrophenylhydrazine DNPH derivatization; a first microfluidic channel, being a siphon channel that is a passage suitable to allow the fluidic sample to move through the passage to a detection part and connects the sample injection part and the detection part; an eluent introduction part suitable for injecting an eluent; a second microfluidic channel that is a passage suitable to allow the eluent to move through the passage to the detection part and connects the eluent introduction part and the detection part; and the detection part coated with a substance capable of causing reaction with the aldehydes or ketones of the fluidic sample suitable to separate the aldehydes or ketones of the fluidic sample and to develop the aldehydes or ketones with the eluent, wherein upon rotation of the rotatable platform, the aldehydes or ketones injected into the sample injection part can be subjected to 2,4-dinitrophenylhydrazine DNPH derivatization; characterized in that the inside of the sample injection part is filled with 2,4-2,4-dinitrophenylhydrazine DNPH coated silica in the form of beads. a sample injection part suitable for injecting a fluidic sample containing the aldehydes or ketones and suitable for subjecting the aldehydes or ketones to 2,4-dinitrophenylhydrazine DNPH derivatization; a first microfluidic channel, being a siphon channel that is a passage suitable to allow the fluidic sample to move through the passage to a detection part and connects the sample injection part and the detection part; an eluent introduction part suitable for injecting an eluent; a second microfluidic channel that is a passage suitable to allow the eluent to move through the passage to the detection part and connects the eluent introduction part and the detection part; and the detection part coated with a substance capable of causing reaction with the aldehydes or ketones of the fluidic sample suitable to separate the aldehydes or ketones of the fluidic sample and to develop the aldehydes or ketones with the eluent, wherein upon rotation of the rotatable platform, the aldehydes or ketones injected into the sample injection part can be subjected to 2,4-dinitrophenylhydrazine DNPH derivatization; characterized in that the inside of the sample injection part is filled with 2,4-2,4-dinitrophenylhydrazine DNPH coated silica in the form of beads.