Source: MOBOT, Tropicos.org^[1]

Source: Botanical Voucher Specimen Library, Alkemists Laboratories^[2]

Long slender terminal cell of a multicellular trichome observed at 400x with Acidified Chloral Hydrate Glycerol Solution.
Source: Elan M. Sudberg, Alkemist Laboratories^[7]

Uniseriate covering trichome with numerous isodiametric basal cells and an elongated tapering end observed at 400x with Acidified Chloral Hydrate Glycerol Solution.
Source: Elan M. Sudberg, Alkemist Laboratories^[8]

Epidermis of leaf showing wavy anticlinal wall & short biseriate glandular trichomes observed at 400x with Acidified Chloral Hydrate Glycerol Solution.
Source: Elan M. Sudberg, Alkemist Laboratories^[9]

Feverfew (flower) HPTLC ID - Anisaldehyde reagent, UV 366 nm

Feverfew (flower) (Tanacetum parthenium)

Lane Assignments Lanes, from left to right (Track, Volume, Sample):

1. 1 µL Feverfew flower from Mexico
2. 2 µL Feverfew flower from Mexico
3. 4 µL Feverfew flower from Mexico
4. 3 µL Feverfew flower
5. 3.5 µL Feverfew flower
6. 4 µL Feverfew flower
7. 2 µL Parthenolide
8. 2 µL Apigenin
9. 1 µL Roman Chamomile flower
10. 2 µL Roman Chamomile flower
11. 4 µL Roman Chamomile flower
12. 1 µL Chamomile flower
13. 2 µL Chamomile flower
14. 4 µL Chamomile flower
15. 1 µL Chamomile flower oil 

Reference Sample(s) Reference: Dissolve 1.5 mg of apigenin in 5 mL of methanol. Dissolve 1 mg of parthenolide in 5 mL of methanol. 

Stationary Phase Stationary phase, i.e. Silica gel 60, F254 

Mobile Phase Ethyl acetate, cyclohexane 1:1 (v/v) 

Sample Preparation Method Sample: Mix 1 g of powdered sample with 10 mL of methanol and sonicate for 10 minutes, then centrifuge or filter the solutions and use the supernatants / filtrates as test solutions. Dissolve 10 µL of the essential oil in 1 mL of toluene.

Derivatization reagent: Anisaldehyde reagent; Preparation: 170 mL of ice-cooled methanol are mixed with 20 mL of acetic acid, 10 mL of sulfuric acid and 1 mL of anisaldehyde; Use: Dip (time 0, speed 5), heat at 100°C for 4 min 

Detection Method Saturated chamber; developing distance 70 mm from lower edge; relative humidity 33% 

Other Notes Images presented in this entry are examples and are not intended to be used as basis for setting specifications for quality control purposes.

System suitability test: (UV 366 nm); Apigenin: blue zone at Rf ~ 0.20; Parthenolide: pink zone at Rf ~ 0.48

Identification: Compare result with reference images. The fingerprint of the test solution is similar to that of the corresponding botanical reference sample. Additional weak zones may be present. Under UV 366 nm the chromatogram of the test solution shows a prominent pink zone (violet zone under white light) at Rf ~ 0.48 corresponding to reference substance parthenolide. Above it there is a greenish zone (grey zone under white light) and a weak brownish zone (violet zone under white light). At the position of reference substance apigenin (Rf ~ 0.20) there are two brown zones (grey zone under white light) (green arrows).

Test for adulteration: Under UV 366 nm there are no intense red zones (violet zone under white light) between Rf ~ 0.20 and 0.30. No blue zone is seen at the position of parthenolide (orange arrows; Feverfew flower from Mexico). Under UV 366 nm no blue zone at the position of apigenin (Rf ~ 0.20) is seen (yellow arrow; Roman Chamomile flower). Under UV 366 nm no blue zone is seen at the position of parthenolide (blue arrow; Chamomile flower). Chamomile flower oil does not show any zones below Rf ~ 0.60.

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  Feverfew (flower) HPTLC ID - Anisaldehyde reagent, UV 366 nm

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  Feverfew (flower) HPTLC ID - Anisaldehyde reagent, white RT

Source: HPTLC Association ^[10]