Pharmacist Blog about what I encounter and find useful/interesting

These are the last pictures. Part 1:  HERE Part 2:  HERE Part 3:  HERE

Part 1:  HERE Part 2:  HERE

Part 2 of the series, looking at a meadowsweet powder under the microscope. Part 1:  HERE

We acquired some meadowsweet powder and put it under a microscope, following the standard procedure of the European Pharmacopeia (using some droplets of a chloralhydrate solution (80 g in 20 mL)), heating followed by cooling, to minimize the crystallization process of chloralhydrate. Namely a phase contrast microscope.  What we saw was a lot of irrecognisable structures, cells, celldebris, trichoma's (hairs), stoma, ..., but fascinating nonetheless.

Structure of meprobamate (source: Wikipedia) Meprobamate is an amide derived from carbamic acid. More specifically, from a dicarbamate of a diol in this case. Carbamic acid: NH2COOH. It does not exist on its own, it automatically splits into NH3 and CO2. The two clear amide bonds are indicated with the red circles. Full name of meprobamate is: 2-methyl-2-propyl-1,3-propanediolcarbamate. Properties It is a white crystalic powder or forms colourless crystals. It tastes quite bitter, acrid even. It is sparingly soluble in water at a temperature of 25 °C, a little but more soluble at a higher temperature of 50 °C and it's good soluble in alcohol. How to identify meprobamate - Specific melting point of 104-108 °C - Can look at the IR (infrared) spectrum - Adding acetic acid anhydride and sulfuric acid (H2SO4) will form a precipitate with a very characteristic melting point of 124-128 °C = N,N-diacetylderivate is formed out of the acid reaction. - Adding an alcoholi...

Structure of Benzalkonium chloride, source: Wikipedia Properties White to white-yellow powder or gelatinous yellowwhite fragments, the compound is hygroscopic, which means it easily attracts water (from f.e. the air). When the compound gets heated, it will form a clear molten mass. It is soluble in water and alcohol. When it is resolved in water, the H2O solution will form excessive foam. How to identify the compound It - UV spectrophotometry: maxima at 257 nm, 263 nm and 269 nm. - Using liquid chromatography - Adding Na-tetraphenylborate and acetic acid will form a sediment of benzalkoniumtetraphenylborate. Which has a characteristic melting point of 127-133 °C. - Bringing the compound in a NaOH solution together with BFB (bromephenol blue) and dimethylchloride will form a blue colour in the CH2Cl2 layer. This is caused by the ionpair forming with the anionic pigment (BFB) and extraction of the ionpair in the organic layer. - Identification of Cl- ions: + AgNO3 will f...

Meadowsweet Filipendula ulmaria Filipendula ulmaria in nature General info: NL: Moerasspirea Ger.: Mädesüss FR: Reine-des-prés Family: Rosaceae ("the rose family") Most common distribution: Northern Europe, Northern America and northern Asia. Parts of the plant used for medicinal use: Flos (flowers), herba (herbs). The traditional use of this plant is: - Diaphoretic - Diuretic - Anti-gout - Anti-rheumatism - Anti Bladder and kidney inflammation - Anti ulcerations in the stomach - Anti burning stomachacid - Anti diarrhea Often prescribed by professionals against a cold. Chemical components of the plant: - Flavonoids - Tannins (up to 12,5% of the total of all components) - Etheric oil (mainly salicylcomponents, primarily salicylaldehyde together with gaultherin, methylsalicylate, salicin, spirein, etc.) The main effects of the plant are caused by these salicylates. In the body, these salicylates inhibit the COX enzymes. (COX1 and COX2) C...