Question Изпитване на масла pmk

[lucas_cash]

Може ли някой да ми каже как мога да тествам и да проверя дали маслото pmk е качествено или не? Как да тествам това? Има ли метод за това или нещо подобно?

 

[Osmosis Vanderwaal]

Какъв е цветът? Помиришете го нежно. ЛЕКО. Проверете температурата на топене или кипене. Претеглете един кубически сантиметър от него или претеглете 1,02 г и вижте какъв е обемът Вероятно има и тест с реагент, не съм го търсил

 

[lucas_cash]

Благодарим ви ! Проверявам го веднага !

 

[mycelium]

Stage 2 Qualitative Test for Piperonal


To determine the presence of piperonal (and aldehydes), a qualitative reaction with acid fuchsine is used. The color of the reagent changes to red, which indicates the presence of aldehydes in the sample.

Reagents and materials

• ~50 mg Basic fuchsine (CAS 632-99-5)
• 3-5 ml H2SO4 83%
• ~10 mg Piperonal
• 2-3 ml EtOH 88%
• Test tubes
• Beakers
• Stand
• Pipettes

Preparation of acid fuchsin solution:


Dissolve a small amount of fuchsin in concentrated sulfuric acid. The approximate concentration of acid fuchsin should be 1-2%. Fig 20

Fig 20


Sample preparation:


A small amount of piperonal 1-2 drops or about 1-2 mg dissolved in a small amount of alcohol. Fig 21

Fig 21


Carrying out the reaction:


Place 1–2 ml of acid fuchsin solution in a clean test tube.


Then add 1–2 drops of piperonal solution.


In the presence of piperonal, a characteristic violet or red color will form (according to the concentration). This indicates the presence of an aldehyde group in the analyzed substance. Fig 22


Not sure if this will work it was in the "piperine to mdp2np" post by @GhostChemist

 

[GhostChemist]

This test only for aldehydes

pmk - is the ketone

 

[GhostChemist]

The nitroprusside (Sodium nitroprusside CAS 13755-38-9) reaction is used for the identification of ketones
and
Haloform reaction (also referred to as the Lieben haloform reaction)

 

[GhostChemist]