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Quantification of Galantamine in Sternbergia Species by High Performance Liquid Chromatography/Sternbergia Turlerinde Yuksek Performansli Sivi Kromatografisi ile Galantamin Miktar Tayini.

INTRODUCTION

Galantamine is approved by the Food and Drug Administration for the treatment of mild to moderate Alzheimer's disease. (1) Razadyne ([R]) (formerly Reminyl ([R])) and Nivalin ([R]) are licensed drugs of galantamine, currently available on the market. (2) This drug inhibits acetylcholinesterase enzyme reversibly and acts as an allosteric modulator of the nicotinic cholinergic receptor. Interaction potentiates cholinergic nicotinic neurotransmission by modulating ion channel activity in the presence of acetylcholine. (1-4) This drug provides the requisite cholinergic stimulation without producing desensitization. Furthermore, galantamine appears to be a more powerful elevator of frontal cortical dopamine levels compared to other cholinesterase inhibitors such as donepezil. (1) Galantamine exerts neuroprotection on neuronal cell cultures subjected to oxidative stress or amyloid beta stress. Neuroprotection in rat hippocampal slices subjected to oxygen and glucose deprivation followed by a reoxygenation period was also demonstrated by galantamine. Galantamine also acts as a neuroprotective agent in an in vivo model of global cerebral ischemia, even when given after the ischemic insult. (5,6)

Galantamine was firstly isolated from the snowdrop, Galanthus woronowii. Generally Amaryllidaceae plants including Narcissus, Galanthus, Lycoris, and Leucojum species are used for extraction of galantamine. Leucojum aestivum is known as the main source of this compound. Narcissus species also contain galantamine in varying amounts from trace amounts to as much as 2.5% of dry weight. Synthetic methods for production of galantamine have been developed; however due to their high cost, plants are still the main sources for galantamine production. (7)

The galantamine content of Amaryllidaceae plants was investigated using different high performance liquid chromatography (HPLC) methods. (7) An isocratic solvent system consisting of an acetonitrile:methanol:water (containing 7.5 mM triethanolamine, pH 6.9) mixture as mobile phase was used for detecting galantamine on an RP-C8 column in L. aestivum. (8) In another study conducted on L. aestivum, an acetonitrile:methanol:buffer pH 4.5 (10:10:80) mixture was used for elution on an RP-C18 column to determine galantamine amount. (9) Lubbe et al. (10) also reported HPLC analysis of galantamine in Narcissus pseudonarcissus on a C18 column using 10% (v/v) acetonitrile in water containing 0.1% trifluoroacetic acid (TFA) as mobile phase. Galanthus elwesii was also analyzed for its galantamine content by using a mobile phase comprising a TFA:water:ACN (0.01:90:10) mixture on an RP-C18 column. (11) Petruczynik et al. (12) analyzed galantamine on an RP-C18 column with a mobile phase containing 5% MeCN, 20% acetate buffer at pH 3.5, and 0.025 [mL.sup.-1] diethylamine as well as on an SCX column using an 8% MeCN and phosphate buffer at pH 2.5 mixture as mobile phase in L. aestivum, Leucojum vernum var. carpaticum, Galanthus nivalis, Zepyranthes rosea, and Clivia minata.The genus Sternbergia Waldst. and Kit. (Amaryllidaceae) is represented by eight species and they are widely distributed from the East Mediterranean to Caucasia. In Turkey six taxa of this genus grow naturally. (13) Sternbergia species are well known due to their alkaloid contents, i.e., lycorine and galantamine, with interesting pharmacological properties. (14,15) Alkaloids including lycorine, homolycorine, haemanthidine, haemanthamine, 6[alpha]and 6[beta]-hydroxy-haemanthamine, and tazettine have been isolated from Sternbergia species. (1418) It has been reported that Sternbergia species contain especially crinine-type and lycorine-type Amaryllidaceae alkaloids. (13)

In order to investigate new sources for galantamine, Sternbergia species were investigated using HPLC in the current study. Sternbergia lutea, Sternbergia sicula, Sternbergia fischeriana, Sternbergia clusiana, and Sternbergia colchiciflora, which were collected from different locations of Anatolia, were analyzed using HPLC. An isocratic system was developed and used for HPLC analysis. Galantamine, which was isolated from S. fischeriana bulbs previously, was used for quantification of the galantamine contents of S. lutea, S. sicula, S. fischeriana, S. clusiana, and S. colchiciflora.

EXPERIMENTAL

Plant materials

Sternbergia species were collected from different parts of Anatolia as shown in Table 1. Voucher specimens are kept at the Herbarium of Ankara University, Faculty of Pharmacy with their herbarium numbers (Table 1).

Isolation of galantamine

Galantamine was isolated from S. fischeriana bulbs. The dried bulbs (500 g) were extracted with ethanol (5 L) by percolation. Ethanolic extract was filtered and concentrated under vacuum at 50[degrees]C by evaporation. The pH of the extract was adjusted to 3 by addition of 5% HCl. After filtration CH[Cl.sub.3] was used for liquid--liquid extraction. The chloroform part was concentrated under vacuum by evaporation to obtain extract A (13.7538 g), which contained lycorine and tazettine. The remaining acidic-water part was extracted with CH[Cl.sub.3] after addition of alkali solution (N[H.sub.4]OH 25% to obtain pH 8). The concentrated chloroform part gave extract B (1.9712 g). Extract B was separated by Chromatotron on aluminum oxide GF Gypsum (Merck 1092) plates. Elution was performed with a CH[Cl.sub.3]:MeOH (9:1) mixture. Fractions 1-4 were subjected to further separation by preparative TLC on precoated TLC sheets (Merck 5744) eluting with CH[Cl.sub.3]:MeOH (85:15) to obtain galantamine (5.04 mg). (19) The structure of the isolated compound was elucidated by [.sup.1]H-NMR and comparison of these data with the literature. (19-23)

Galantamine: [.sup.1]H-NMR (CD[Cl.sub.3], 400 MHz, [delta], ppm, J/Hz): 6.63 (1H, d, J=8 Hz, H-12); 6.53 (1H, d, J=8 Hz, H-11); 6.02 (1H, d, J=10.3 Hz, H-4); 6.00 (1H, d, J=10.3 Hz, H-3); 4.47 (1H, brs, H-16); 4.10 (1H, m, H-2[alpha]); 4.06 (1H, d, J=15.2 Hz, H-9[beta]); 3.98 (1H, d, J=15.2 Hz, H-9[alpha]); 3.05 (1H, m, H-7[alpha]); 2.95 (1H, m, H-7[beta]); 2.56 (1H, m, H-1[alpha]), 2.45 (1H, m, H-1[beta]); 1.50 (1H, m, H-6[alpha]); 1.47 (1H, m, H-[beta]), 3.72 (s, O-C[H.sub.3]), 2.51 (s, N-C[H.sub.3]).

HPLC analysis

HPLC analyses were carried out using an Agilent LC 1100 model chromatograph (Agilent Technologies, Inc., Santa Clara, CA, USA). The diode-array detector was set at wavelength 292 nm and peak areas were integrated automatically by computer using Agilent software. The chromatograms were plotted and processed using the above-mentioned software. Separation was carried out using a SUPELCOSIL LC-18 column (250x4.6 mm i.d.; 5 [micro]m; Supelco, Bellefonte, PA, USA). The mobile phase was made up of ammonium carbonate (Laboratory BDH Reagent, Poole, UK) water solution (purified water was obtained by using Milli-Q Plus System (Millipore Corp., Molsheim, France) and acetonitrile (HPLC grade 99.93 % purity, Sigma-Aldrich 270717) (85:15 v/v) applied at a flow rate of 1 mL/min, column temperature 24[degrees]C, and 20 [micro]L portions were injected into the liquid chromatography system.

Preparation of standard and sample solutions

Standard stock solution was prepared in 1 mg/mL concentration. First 10 mg of galantamine was weighed in a 10 mL volumetric flask and then it was dissolved in 10 mL of 1% [H.sub.2]S[O.sub.4]. Different concentration levels (0.025 mg/mL, 0.05 mg/mL, 0.075 mg/mL, 0.1 mg/mL, 0.2 mg/mL, 0.3 mg/mL, and 0.4 mg/mL) were prepared by diluting the stock solution.

Sample solutions were prepared by extraction of dried and powdered bulbs (10 g) of each plant with 1% [H.sub.2]S[O.sub.4] by rinsing at room temperature for 7 days. The extraction procedure was tested with Mayer's reagent to be sure all alkaloids were extracted. Each extract was filtered through a 0.45-mm membrane filter and adjusted to a final volume of 500 mL with acidic solution.

Limits of detection and quantification

The limit of detection (LOD) and limit of quantification (LOQ) were established at a signal to noise ratio (S/N) of 3 and 10, respectively. LOD and LOQ concentrations were experimentally verified by six injections of galantamine. The precision of the method (intra-day variations of replicate determinations) was checked by injecting galantamine nine times at the LOQ level.

RESULTS AND DISCUSSION

To date, any Sternbergia species growing in Turkey has been reported that does not contain galantamine. In addition, galantamine has not been determined in any Sternbergia species growing in Turkey. However in the present study galantamin was detected and quantified in Sternbergia species. (13,24) This study led to the isolation of this compound from the bulbs of S. fischeriana collected from Yayladag in Antakya Province. Additionally, the current study describes the development of a method for identifying and quantifying galantamine in Sternbergia species. Good separation and determination of this compound were achieved using a mobile phase consisting of ammonium carbonate and acetonitrile (85:15 v/v) on a SUPELCOSIL LC-18 column (250x4.6 mmx5 [micro]m) at wavelength 292 nm as shown in Figures 1 and 2.

LOD and LOQ values were 7.5 [micro]g and 25 [micro]g, respectively. Table 2 shows the wavelength measured, the calculated calibration curve, and the LOD and LOQ results for this compound. The precision of the method is expressed as the relative standard deviation at the LOQ level.

The presence of galantamine (Figure 3) in S. lutea subsp. lutea, S. lutea subsp. sicula, S. candida, S. fischeriana, and S. clusiana was analyzed quantitatively and qualitatively by HPLC. The current study results, as shown in Table 3, revealed that all plant samples contain galantamine and the highest content was determined in S. lutea subsp. sicula (0.0165[+ or -]0.0002% dw) followed by S. lutea subsp. lutea (0.0100[+ or -]0.0005% dw). According to previous studies, G. woronowii and L. aestivum contain 0.003-0.506% and 0.0028-0.2104% galantamine, respectively. (25,26) The galantamine content ranged from 0.05 to 0.36 mg/g dw in the bulbs of G. nivalis and from 0.3 to 0.033 mg/g dw in the bulbs of Narcissus tazetta samples collected from different locations in Iran. According to the results, geographical regions and cultural practices affected the chemical composition of the plants. The chemical variations can be attributed to environmental factors. (7) L. aestivum plants collected during different periods of vegetation were analyzed for their galantamine contents and the amounts were determined as 0.13% and 0.14%, respectively, for the plant in bloom and fructification, respectively. (9) According to Petruczynik et al. (12), different extraction procedures such as maceration, extraction in an ultrasonic bath, and extraction in an ultrasonic bath following maceration yielded different amounts of galantamine. Galantamine content in L. aestivum was determined as 0.0196 mg/mL, 0.0273 mg/mL, and 0.0949 mg/mL, respectively, by the mentioned extraction procedures. Ultrasonic bath extraction following maceration induced a relatively high amount of galantamine extraction. In the same study the highest amount of galantamine was determined in L. aestivum roots with 2.3524 mg/g dw, followed by leaves with 1.6611 mg/g dw. Z. rosea bulbs and C. minata leaves as well as roots were found to contain 0.8384 mg/g dw and 0.1489 mg/g dw, and 0.0284 mg/g dw galantamine, respectively. In all parts of G. nivalis galantamine content varied from 0.0003 mg/g dw to 0.0178 mg/g dw. G. elwesii samples collected from two different locations in Turkey, izmir and Karaburun, contained 0.026% and 0.007% galantamine, respectively. (11) The amount of galantamine also varied from 2.36 mg/g dw to 3.32 mg/g dw in N. pseudonarcissus bulbs collected from the Netherlands. (10) According to our results, galantamine content of the Sternbergia species was lower than that of L. aestivum when they were compared. The current study's results revealed that Sternbergia species are not valuable sources for galantamine extraction. Differences in galantamine content among all the investigated species could be explained by the existence of chemotype. Furthermore, a number of factors such as temperature, season, stages of maturity, geographical origin, climatic conditions, and soil can affect the phytochemical content of plants. (27,28) Plants cultivated under different conditions exhibit an alteration in the quantity of phytochemicals and therefore display varied therapeutic effects. (29,30)

CONCLUSIONS

The present study is the first report of galantamine isolation from Sternbergia species growing in Turkey. An HPLC method was developed for identification and quantification of galantamine in the genus Sternbergia. The presence of galantamine could be related to growing conditions such as temperature, season, climatic conditions, soil, or stages of maturity as well as geographical origin. Chemotype of the mentioned species could be also the reason for the presence of galantamine in Sternbergia species. Therefore, further studies will be planned to investigate Sternbergia species collected from different locations in Turkey for their galantamine contents.

Conflict of Interest: No conflict of interest was declared by the authors.

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[iD] Ozlem Bahadir ACIKARA, [iD] Betul Sever YILMAZ (*), [iD] Dilhun YAZGAN, [iD] Gulcin Saltan ISCAN

Ankara University, Faculty of Pharmacy, Department of Pharmacognosy, Ankara, Turkey

*Correspondence: E-mail: sever@pharmacy.ankara.edu.tr, Phone: +90 532 300 69 94 ORCID-ID: orcid.org/0000-0003-2084-9514

Received: 22.09.2017, Accepted: 28.12.2017

DOI: 10.4274/tjps.95967
Table 1. Plant materials, collected places, and herbarium numbers

Species                   Herbarium numbers  Collection sites
Sternbergia candida       AEF 23794          Mugla-Fethiye
Mathew & T.Baytop
Sternbergia clusiana      AEF 23697          Kahramanmaras-Goksun
(Ker Gawl.) Ker Gawl.
ex Sprengel
Sternbergia fischeriana   AEF 23793          Antakya-Yayladag
(Herbert) Rupr.
Sternbergia lutea subsp.  AEF 23694          izmir-Torbali
lutea Waldst. & Kit.
Sternbergia lutea subsp.  AEF 23695          Mugla-Marmaris
sicula Tineo ex Guss.

Table 2. Linearity results, LOQ, and LOD

Compound     [lambda]  Equation              [r.sup.2]  Slope RSD %

Galantamine  292       Y=118484.33X + 448.2  0.995      2.0594

Compound     Intercept RSD %  LOQ         LOD
                              ([micro]g)  ([micro]g)

Galantamine  4.4493           25          7.5

LOQ: Limit of quantification, LOD: Limit of detection, RSD: Relative
standard deviation

Table 3. Galantamine contents of Sternbergia species

Species                          Galantamine % (n=3, mean [+ or -]
                                 standard deviation)

Sternbergia candida              0.0092[+ or -]0.0005
Sternbergia clusiana             0.0077[+ or -]0.0001
Sternbergia fischeriana          0.0069[+ or -]0.0006
Sternbergia lutea subsp. lutea   0.0100[+ or -]0.0005
Sternbergia lutea subsp. sicula  0.0165[+ or -]0.0002
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Title Annotation:ORIGINAL ARTICLE
Author:Acikara, Ozlem Bahadir; Yilmaz, Betul Sever; Yazgan, Dilhun; Iscan, Gulcin Saltan
Publication:Turkish Journal of Pharmaceutical Sciences
Article Type:Report
Geographic Code:7TURK
Date:Mar 1, 2019
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