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Anais da Academia Brasileira de Ciências

Print version ISSN 0001-3765

An. Acad. Bras. Ciênc. vol.85 no.4 Rio de Janeiro  2013  Epub Nov 10, 2013

http://dx.doi.org/10.1590/0001-3765201393812 

Chemical Sciences

Evaluation of morpho-anatomical and chemical differences between varieties of the medicinal plant Casearia sylvestris Swartz

JOSIANE C. CLAUDINO1 

LUIS V.S. DO SACRAMENTO2 

INGRID KOCH3 

HELEN A. SANTOS3 

ALBERTO J. CAVALHEIRO4 

ARISTEU G. TININIS5 

ANDRé G. DOS SANTOS1 

1Laboratório de Farmacognosia-LAPDESF, Faculdade de Ciências Farmacêuticas, Universidade Estadual Paulista-UNESP, Rodovia Araraquara-Jaú, Km 01, Bairro Campus, 14801-902 Araraquara, SP, Brasil

2Laboratório de Farmacobotânica, Faculdade de Ciências Farmacêuticas, Universidade Estadual Paulista-UNESP, 14801-902 Araraquara, SP, Brasil

3Curso de Biologia, Universidade Federal de São Carlos-UFSCar, Campus Sorocaba, Rodovia João Leme dos Santos, Km 110, Bairro do Itinga, 18052-780 Sorocaba, SP, Brasil

4Núcleo de Bioensaios Biossíntese e Ecofisiologia de Produtos Naturais, Instituto de Química, UNESP, 14801-970 Araraquara, SP, Brasil

5Instituto Federal de São Paulo, Campus Avançado de Matão, 15990-040 Matão, SP, Brasil


ABSTRACT

Casearia sylvestris Swartz (Salicaceae) has been used in traditional medicine and its leaf extracts have been exhibited important pharmacological activities. The species presents morphological, chemical and genetic variation. Two varieties are considered due external morphological differences: C. sylvestris var. sylvestris and var. lingua. There are difficulties in definition of these varieties. The objective of this work is to evaluate chemical and morpho-anatomical differences between C. sylvestris varieties that can be applied in their distinction for pharmaceutical or botanical purposes. Transverse and paradermic sections of leaves were prepared for morpho-anatomical, histochemical and quantitative microscopy (stomatal and palisade index) analyses. Diterpene profiles of the specimens were obtained by HPLC-DAD and TLC. Morpho-anatomical analyses demonstrated significant differences between the varieties only in paradermic sections: var.sylvestris - polygonal epidermic cell walls and hypostomatic; var. lingua - rounded epidermic cell walls and amphistomatic. No differences were observed for stomatal index; palisade index was found 2.8 for var. lingua and 3.9 for var.sylvestris. Chromatographic analyses confirmed previous results demonstrating that diterpene profile in varieties differs, with predominance of these metabolites in var. sylvestris. In conclusion, this work indicates that chromatographic analysis besides morpho-anatomical analysis can be applied in distinction of C. sylvestris varieties.

Key words: Casearia sylvestris ; chromatography; diterpenes; morpho-anatomy

RESUMO

Casearia sylvestris Swartz (Salicaceae) é uma planta utilizada na medicina tradicional, cujos extratos de folhas demonstraram importantes ações farmacológicas. A espécie apresenta variação morfológica, genética e química. Duas variedades são consideradas devido a diferenças morfológicas: C. sylvestris var.sylvestris e var. lingua. Há dificuldades na definição destas variedades. O objetivo deste trabalho é avaliar diferenças morfo-anatômicas e químicas entre as variedades de C. sylvestris que permitam sua diferenciação com aplicação farmacêutica ou botânica. Seções transversais e paradérmicas de folhas foram preparadas para análises morfo-anatômicas, histoquímicas e microscopia quantitativa (indices de estômatos e paliçada). Análises cromatográficas (CLAE-DAD e CCD) foram realizadas para obter o perfil de diterpenos clerodânicos. Os resultados das análises morfo-anatômicas demonstraram diferenças significativas entre as variedades somente em cortes paradérmicos: var.sylvestris - paredes celulares epidérmicas poligonais e hipoestomática, var. lingua - paredes celulares epidérmicas arredondadas e anfiestomática. Os índices de estômatos não revelaram diferenças; os valores dos índices de paliçada foram de 2,8 para var.lingua e 3,9 para var. sylvestris. As análises cromatográficas confirmaram resultados prévios, demonstrando predomínio de diterpenos na var.sylvestris. Este trabalho sugere que análises cromatográficas e morfo-anatômicas podem ser ferramentas aplicáveis na distinção das variedades da espécie.

Palavras-Chave: Casearia sylvestris ; cromatografia; diterpenos; morfo-anatomia

INTRODUCTION

Casearia sylvestris Swartz (Salicaceae), known as “guaçatonga” or “erva-de-bugre”, is a plant species distributed throughout South America that occurs in 22 states of Brazil, especially within the Atlantic and Amazon forests and the Cerrado biomes (Marquete 2001, Sleumer 1980). The plant has been widely used in traditional medicine for the treatment of snake bites and in wound healing, and also as an antiulcer and topical antiseptic (Hoehne 1939, Lorenzi and Matos 2002). Pharmacological studies on its leaf extracts have demonstrated antiulcerogenic, anti-inflammatory, antivenom, and cytotoxic (tumor cell lines) activities. Moreover, no significant toxicological effects of its ethanolic or hydroalcoholic extracts have been observed in vitro or following oral administration in animals (Basile et al. 1990, Borges et al. 2000, Ferreira et al. 2010, Maistro et al. 2004, Santos et al. 2010, Sertiè et al. 2000, Silva et al. 2004). The Brazilian Agency of Medicines (Agência Nacional de Vigilância Sanitária - ANVISA) recognizes the importance of the species that was included in a positive list of medicinal plants for sale in pharmacies (Brasil 2010).

Secondary metabolites isolated-identified from C. sylvestris include monoterpenes and sesquiterpenes (Sousa et al. 2007),nor-isoprenoids (Santos 2008, Wang et al. 2009a), triterpenes, lapachol, cafeic, chlorogenic and vanillic acids, flavonoids (Raslan et al. 2002), neolignans (Wang et al. 2010), ellagic and gallic acids derivatives (Silva et al. 2008a, Silva et al. 2008b). Additionally, phytochemical studies of Caseariaspecies have revealed the presence of typical oxygenated tricycliccis-clerodane diterpenes in which the tetrahydrofuran ring bears two acyloxy groups at C18 and C19 (Chen and Wiemer 1991, Guittet et al. 1988, Kanokmedhakul et al. 2005,Oberlies et al. 2002, Santos et al. 2010). Diterpenes of this group were isolated from C. sylvestris: casearins A-X and caseargrewiin F - leaves (Carvalho et al. 1998, Itokawa et al. 1990, Morita et al. 1991, Santos et al. 2010, Wang et al. 2009b); casearvestrins A-C - stems and leaves (Oberlies et al. 2002); and roots ofrel-19S-acetoxy-18R-butanoyloxy-18,19-epoxy-6S-hydroxy-2R-(2-methylbutanoyloxy)-5S,8R,9R,10S-cleroda-3,13(16),14-triene (Espíndola et al. 2004). These compounds exhibited some important biological activities as anti-fungal, antiulcer, trypanocidal, and cytotoxicity against human tumor cell lines (Espíndola et al. 2004, Itokawa et al. 1990, Oberlies et al. 2002, Santos 2008, Santos et al. 2010).

Casearia sylvestris was first described by Swartz in Flora Indiae Occidentalis (1797) and Eichler and Martius (1871) included it inFlora Brasiliensis of Carl Friedrich Philipp von Martius, classified in Bixaceae family. Later it was classified inFlacourtiaceae family (Absy and Scavone 1973, Sleumer 1980). The Angiosperm Phylogeny Group(APG) updated the classification of Angiosperms in 2003 and some genera ofFlacourtiaceae (e.g. Casearia Jacq.) were classified as Salicaceae. C. sylvestris Swartz (Crateria Bentahm section) is classified inSamydeae tribe, Salicaceae family andMalpighiales order (Chase et al. 2002, The Angiosperm Phylogeny Group 2003). The macromorphology of the species is described in the work of Torres and Yamamoto (1986), based on descriptions of Eichler and Martius (1871) and Sleumer (1980). The morpho-anatomical characters of the leaves were described by Absy and Scavone (1973) and Alquini and Takemori (2000).

C. sylvestris occurs in different biomes showing great morphological variability: the size, shape, texture and consistency of the leaves, the pubescence of the branches and inflorescences, the number of flowers per inflorescence, the length of peduncle, and its height - shrubs to trees (Marquete 2001, Torres and Yamamoto 1986). Sleumer (1980) considered two varieties to the species due external morphological differences, connected by intermediate forms that are difficult to distinguish: C. sylvestris var. sylvestris andC. sylvestris var. lingua(Cambess.). Silva et al. (2006) reported differences observed during collection between varieties. In Cerrado biome the specimens were shrubs, with coriaceous lighter green leaves with smaller width and length, corresponding to C. sylvestris var. lingua; unlike, specimens of Atlantic Forest were trees with different heights (always higher than 2 m), green dark leaves larger in width and length, corresponding to C. sylvestris var. sylvestris. The differences between varieties were summarized by Klein and Sleumer (1984).

Besides the macromorphological differences between the varieties, metabolism variability analyses have suggested a minor expression of diterpenes and a greater expression of flavonoids (as rutin) in C. sylvestris var. lingua. Studies of genetic variability also indicated distinct genetic profiles for the varieties (Cavallari 2008, Silva et al. 2006).

Considering the importance of C. sylvestris as medicinal plant, the chemical variability observed in previous works, mainly for the bioactive diterpenes and rutin, and the difficulties to distinguish the varieties ofC. sylvestris by macromorphological analyses in the present article, we report on the evaluation of chemical and morpho-anatomical differences between C. sylvestris varieties that can be applied in their distinction for botanical purposes or pharmaceutical applications.

MATERIALS AND METHODS

Materials

Leaves of C. sylvestris were collected at Araraquara, São Paulo State, in February 16, 2011 (in the morning).C. sylvestris var. lingua(Estação Experimental de Araraquara, Instituto Florestal, São Paulo): AGS38 (S 21.73619, W 48.17987), AGS43 (S 21.73605, W 48.17610), AGS44 (S 21.73600, W 48.17603), AGS45 (S 21.73596, W 48.17605) and AGS51 (S 21.71112, W 48.17339).C. sylvestris var. sylvestris(Universidade Estadual Paulista, UNESP Araraquara; except AGSDER): AGS101 (S 21.81466, W 48.20215), AGS102 (S 21.81466, W 48.20215), AGS103 (S 21.81631, W 4819838), AGS104 (S 21.81430, W 48.20160) and AGSDER (S 21.73596, W 4818850). Voucher specimens of AGS38, AGS43, AGS44, AGS45 AGS51, AGS101 and AGS102 were deposited with the Herbarium “Maria Eneida P. Kaufmann” of Instituto Botânico do Estado de São Paulo. AGS103 e AGS104 are clones (plant cutting) of specimens Cs400 and Cs78 that were identified asC. sylvestris var. sylvestris (Cavallari 2008).

The solvents used for extraction and TLC analyses were analytical grade (Synth®, Diadema, São Paulo, Brazil) whilst those used in HPLC analyses and solid phase extraction (SPE) were HPLC-UV grade (J. T. Baker®, Xalostoc, Mexico). Water was purified (18.1 MΩ.cm) with a Milli Q plus system (Millipore®, São Paulo, Brazil) immediately prior to use. SPE was performed using as stationary phase LiChroprep RP18 (40-63 µm; Merck®, Darmstadt, Germany). Analytical reversed-phase HPLC-DAD was performed using a Shimadzu® system (Kyoto, Japan) comprising a model Prominence® LC-20AT pump, SIL-20A autosampler, DGU-20A5 degasser, CTO-20A column oven, SPD-M20A photodiode array detector and CBM-20A communication bus module, fitted with Hypersil Gold® C18 (Thermo® Scientific, USA) column (250 × 4.6 mm, 5 µm), with control and data handling managed by LCsolution® multi-PDA software. TLC was developed in silica gel plate aluminum backed (20 × 20 cm; 200 µm) from Sorbent® Technologies. The chromatographic standards of clerodane diterpenes (caseargrewiin F, casearin B and X) were purified from leaves extracts of C. sylvestris and identified as published (Santos et al. 2010). Optical microscopy was developed in a Carl Zeiss® Primo Star microscope. Reagents used in histochemical analysis were prepared as described in literature (Costa 2001, Ganter and Jollés 1969-1970, Johansen 1940, Valette et al. 1998).

Morpho-Anatomical Analyses

Anatomical freehand sections (paradermic and transverse) of the middle third of fresh leaves from C. sylvestris were obtained with a blade. The sections were clarified with sodium hypochlorite commercial solution and wash with deionized water before stain with different reagents (Delafield hematoxylin, Astra blue, iodine green and toluidine blue) for selection of better cell wall staining and visualization of tissue structures. The anatomical descriptions were realized based on microscope visualization (40 x) of the sections on covered glass sheet and comparison with literature data (Absy and Scavone 1973, Alquini and Takemori 2000).

Histochemical Investigations

The identification and localization of secondary metabolites in the leaf transverse sections were realized using the follow reagents: Sudan III (Costa 2001, Johansen 1940) and 2.4-dinitrophenylhydrazine (Ganter and Jollés 1969-1970) for terpenes; ferric chloride (Costa 2001, Johansen 1940) and vanillin-hydrochloric acid (Costa 2001, Valette et al. 1998) for phenolic compounds.

Quantitative Microscopy

Palisade index: the average number of palisade cells beneath each epidermal cell is termed the palisade index. The paradermic sections obtained and clarified as described in Morpho-Anatomical Analyses section were mounted on covered glass sheet. Five groups of four epidermal cells were selected in each section. The palisade cells lying beneath each group were counted, being included in the count wich are more than half-covered by the epidermal cells (Evans 2002, Costa 2001).

Stomatal index: the percentage proportion of the ultimate divisions of the epidermis of a leaf which has been converted into stomata is termed the stomatal index (I):

I = [(S x 100)/(E = S)] x 100

Where S is the number of stomata per unit area and E is the number of ordinary epidermal cells in the same unit area. The paradermic sections (upper and lower surfaces), that were obtained and clarified as described in Morpho-Anatomical Analyses section, were stained with Astra blue and mounted on covered glass sheet (Evans 2002,Costa 2001).

Chromatographic Analyses

The following methods were developed and validated to evaluate the diterpene chromatographic profile of C. sylvestris leaf samples in the laboratories of Núcleo de Bioensaios, Biossíntese e Ecofisiologia de Produtos Naturais, Instituto de Química, UNESP, Araraquara-SP (data not published).

Extraction: Dried (40° C, 7 days) and powdered leaves (1.0 g) from the specimens of C. sylvestriswere extracted twice in a test tube with 10 mL of ethyl acetate: hexane: isopropanol 91:08:01 (v-v) by sonication for 1 h. The liquid extracts were filtered, dried at room temperature and at desiccator with silica gel under reduced pressure.

High Performance Liquid Chromatography: 20.0 mg of dried extracts were dissolved in 1.0 mL of methanol: water (98:02, v-v) and submitted to further clean-up by SPE. Laboratory-prepared SPE columns (20 × 7 mm i.d.), dry packed with ca. 1.5 g of LicChroprep RP18, were activated with methanol and conditioned with methanol: water (98:02, v-v). Following application of samples, columns were eluted with 4.0 mL of methanol: water (98:02, v-v). Each eluated was dried in a desiccator with silica gel under reduced pressure, dissolved in methanol (1.0 mL), and filtered through PVDF membranes (0.45 µm) prior to HPLC analysis. The standards of clerodane diterpenes (1.0 mg) were dissolved in methanol HPLC grade (1.0 mL) and filtered through PVDF membranes (0.45 µm). Aliquots of 20 µL were injected onto Hypersil Gold® C18 column (250 × 4.6 mm, 5 µm), which were eluted with a mixture of methanol, acetonitrile and water, initially at 22:44:34 (v-v), changing by linear gradient to 47:53:00 over 42 min, isocratically with 47:53:00 for 5 min, and finally isocratically with 22:44:34 for 10 min (equilibration). The solvent flow rate was 0.8 mL-min. Detection was at 200-700 nm for all samples. Caseargrewiin F, casearin B and X (1.0 mg-mL; methanol) were used as standards.

Casearin-like diterpenes present two different patterns of conjugated double bond in their lateral chain (C11-C16) - C12(Z orE)-C14 or C13(16)-C14 - and their UV spectra present one band and λmax= 231-238 or 221-228 nm, respectively (Carvalho et al. 2009,Espíndola et al. 2004, Itokawa et al. 1990). Thus, we suggested that peaks with UV spectra with one band and λmax= 221-228 or 231-238 nm were relative to the casearin-like diterpenes. Carvalho et al. (2009) analyzed different organs of C. sylvestris with similar approach and results from HPLC-DAD analyses were confirmed by 1H NMR and TLC data. Moreover, five casearin-like diterpenes isolated from leaves of C. sylvestris were identified in its extract and presented peaks with tR in the range of 10-30 min in the same HPLC conditions (Santos 2008). Additionally, as observed by Carvalho et al. (2009), peaks with a second band in the UV spectra with λmax of c.a. 280 nm, indicate the presence of clerodane diterpenes with a aromatic ester substituent, as reported in the literature (Beutler et al. 2000). Thus, clerodane diterpenes were identified in the extract chromatograms on the basis of UV spectra of the peaks. Additionally, the comparison of retention time (tR) and UV spectra of peaks from standard and extract chromatograms was realized.

Thin Layer Chromatography: 8.0 mg of dried extracts and 1.0 mg of caseargrewiin F and casearin B were dissolved in 1.0 mL of ethyl acetate. TLC was developed in silica gel plate aluminum backed (20 × 20 cm; 200 µm) using hexane: ethyl acetate: isopropanol 70:28:02 (v-v) as eluent and sulfuric anisaldehyde as spray reagent.

RESULTS

The macromorphological differences between the varieties of C. sylvestris reported were evident during the collection and the specimens were classified as C. sylvestris var.lingua or C. sylvestris var.sylvestris as described by Sleumer (1980) and Klein and Sleumer (1984).

In the morpho-anatomical study, the best visualization in transverse sections was achieved with dual staining: Delafield hematoxylin followed by green iodine. No significant anatomical differences were observed in transverse sections for the varieties. Morpho-anatomical characters of the leaves were in agreement with literature (Absy and Scavone 1973, Alquini and Takemori 2000). In the midvein region of leaf sections we observed typical cells of xylem, phloem, collenchyma and parenchyma, in addition to fibers associated with vascular bundles (Figure 1a). Both upper and lower epidermises were uniseriate, presenting a lower number of simple nongladular trichomes. The mesophyll is asymmetrical and heterogeneous with two (rarely three) layers of palisade parenchyma and several layers of spongy parenchyma with irregular cells in shape and size. The air spaces (meatus) occur in small proportion in spongy parenchyma (Figure 1b). We also noted the presence of spiral vessels, oil glands, druses and prismatic crystals (calcium oxalate) (Figure 2).

Figure 1 Tranverse section of the midvein region from the leaf of C. sylvestris var. lingua (a) and tranverse section of the region between the midvein and the margin from the leaf of C. sylvestris var. sylvestris (b)

Figure 2 Transverse section of the region between the midvein and the margin from the leaf of C. sylvestris var.lingua

For the paradermic sections, the best stain reagent was Astra blue. In this case we observed significant differences between the varieties. The epidermic cell walls are polygonal in C. sylvestris var.sylvestris and rounded in C. sylvestris var.lingua (Figure 3). Moreover, C. sylvestris var.sylvestris is hypostomatic and C. sylvestrisvar. lingua is amphistomatic. The stomata are paracytic in both varieties.

Figure 3 Paradermic sections (lower epidermis) from the leaf ofC. sylvestris var. sylvestris (a) and var. lingua (b)

Histochemical reagents did not differentiate the varieties and the results were positive for both terpenes and phenolics (all reagents tested).

The results of quantitative microscopy are in Tables I and II. The values of stomatal index for specimens of C. sylvestris var.sylvestris presented great variation: 11.9 to 20.7 % (standard deviation = 3.4). In the case of C. sylvestris var. lingua specimens these values were more homogeneous (standard deviation = 0.2). The mean value of stomatal index for both varieties was similar: 15.9 (var.sylvestris) and 16.4 % (var.lingua). On the other hand, palisade index was found 2.8 for var. lingua and 3.9 for var. sylvestris, demonstrating that this index should be useful in differentiation of C. sylvestris varieties.

TABLE I Stomatal index for specimens of C. sylvestris

SPECIMEN STOMATAL INDEX (%)
LOWER EPIDERMIS UPPER EPIDERMIS
var. sylvestris
AGS103 15.6 -----
AGS104 13.8 -----
AGSDER 11.9 -----
AGS101 20.7 -----
AGS102 17.7 -----
mean (sd 1 ) 15.9 (3.4) -----
var. lingua
AGS 38 16.3 10.3
AGS 43 16.5 9.5
AGS 44 16.1 9.7
AGS 45 16.7 10.1
AGS 51 16.4 9.2
mean (sd) 16.4 (0.2) 9.8 (0.4)

1standard deviation.

TABLE II Palisade index for specimens of C. sylvestris

SPECIMEN PALISADE INDEX
var. sylvestris
AGS103 3.7
AGS104 4.3
AGSDER 3.8
AGS101 3.9
AGS102 3.8
mean (sd 1 ) 3.9 (0.2)
var. lingua
AGS 38 3.1
AGS 43 3.2
AGS 44 2.5
AGS 45 2.6
AGS 51 2.6
mean (sd) 2.8 (0.3)

1standard deviation.

TLC analyses provided information about clerodane diterpenes profile of the extracts. Caseargrewiin F (Rf = 0.23) was identified by TLC (Figure 4) in the extracts of specimens AGS101, AGS102, AGS103, AGS104 (var.sylvestris), AGS44, AGS45 and AGS51 (var.lingua), while casearin B (Rf = 0.26) was not identified in any extract. Moreover, TLC profiles of var.sylvestris specimens are similar, except for AGSDER. Unlike, specimens of var. lingua presented different TLC profiles, except for AGS44 and AGS45. These specimens have TLC profile similar to specimens of var.sylvestris.

Figure 4 Thin layer chromatographic profile (silica; hexane: ethyl acetate: isopropanol 70:28:02; sulfuric anisaldehyde) of extracts from leaves of C. sylvestris. Samples (from left to right): AGS38, AGS51, AGS43, AGS45, AGS44 (var.lingua); AGSDER, AGS102, AGS101, AGS103, AGS104 (var. sylvestris); caseargrewiin F, casearin B (clerodane diterpenes). 

Table III presents results of HPLC-DAD analyses for the ten specimens considering number of peaks and area of selected peaks based on UV spectra-λmax. Figure 5 shows representative chromatograms of both varieties and the structures of diterpene standards. As observed in the example of Figure 5, there is a greater total area of peaks with tR< 5 min in the chromatograms of specimens of C. sylvestris var. lingua and AGSDER (var.sylvestris) than in chromatograms of AGS101-104 (var.sylvestris). On the other hand, the total area of peaks with λmax= 221-228 or 231-238 nm is greater in chromatograms of AGS101-104 (Table III).

TABLE III HPLC-DAD analyses data of leaf extracts from different specimens ofC. sylvestris. The number of peaks and total area of selected peaks based on UV spectra-λmax are presented. 

specimen λmax= 221-228 nm λmax= 231-238 nm λmax= 221-228 nm and c.a. 280 nm λmax= 231-238 nm and c.a. 280 nm
total area n. of peaks total area n. of peaks total area n. of peaks total area n. of peaks
var. sylvestris
AGS101 1,487,789 4 205,577,366 29 10,618,521 6 3,406,177 2
AGS102 1,094,944 3 142,165,961 25 2,437,009 3 8,897,657 4
AGS103 3,204,639 3 241,678,210 33 355,487 1 977,877 1
AGS104 2,070,050 4 223,721,237 24 5,375,576 5 12,867,946 2
AGSDER 7,808,800 13 7,670,449 3 2,537,429 5 -- --
var. lingua
AGS38 25,490,047 22 4,976,442 3 989,125 2 -- --
AGS43 2,410,937 6 52,521,251 17 1,821,007 4 -- --
AGS44 55,220,208 23 8,368,142 2 2,633,624 6 342,820 1
AGS45 34,518,773 23 31,243,011 2 4,585,270 5 -- --
AGS51 790,020 8 21,440,354 16 -- -- -- --

Figure 5 Representative high performance liquid chromatography (C18; methanol: acetonitrile: water gradient; 235 nm) profile of extracts from leaves of C. sylvestris - specimens AGS38 var.lingua (top) and AGS101 var.sylvestris (bottom). Structures of diterpenes standards are presented: caseargrewiin F (cas F), casearins B and X (cas B and cas X). 

We classified the specimens in three groups on the basis of the observed common main peaks (peaks with larger area), identification of clerodane diterpenes (caseargrewiin F, casearin B and X) and predominance of peaks with UV spectrum with λmax= 221-228 or 231-238 nm. The diterpene standards were identified in the extracts by comparison of their tR and UV spectra. Tables IV-VI present data from chromatograms of the three groups: group 1 - AGS38, AGS44-45 (var.lingua); group 2 - AGS43 and AGS51 (var.lingua); group 3 - AGS101-104 (var.sylvestris). AGSDER demonstrated a chromatographic profile with characteristics of different groups.

TABLE IV Data from HPLC-DAD analyses of specimens AGS38, AGS44 and AGS45. Retention time, area and λmax of selected peaks (tR > 10 min; area > 106 in at least one specimen of the group) are presented. 

AGS38 AGS44 AGS45
tR (min) area λmax 1(nm) tR (min) area λmax (nm) tR (min) area λmax (nm)
10.1 214,0383 220 10.1 3,544,160 223 10.0 4,007,308 223
12.0 230,733 220 12.1 2,779,635 223 12.0 3,827,383 223
13.9 1,441,518 223 13.9 1,772,768 223 13.8 2,932,737 223
15.0 6,096,411 239 15.0 15,390,898 238 14.9 16,979,443 238
15.6 2,749,524 223 15.6 6,391,880 223 15.5 7,712,235 222
16.8 2 4,072,823 237 16.9 2 17,521,082 237 16.7 2 14,263,568 237
18.2 2,416,173 223 18.2 1,976,262 223 18.0 3,328,239 223
19.7 3,297,201 223 19.7 655,312 223 19.6 1,541,503 223
--- --- --- --- --- --- 19.9 1,945,180 223
22.7 881,097 223 22.7 682,384 223 22.5 1,182,339 223
27.6 2,022,085 223 27.6 6,344,883 221 27.4 7,792,553 220
31.6 1,672,354 223 31.7 208,153 223 31.5 340,354 223
32.5 2,418,817 223 32.7 2,024,131 223 32.5 2,625,140 223
--- --- --- --- --- --- 35.0 1,641,322 ---
37.1 1,007,356 223 37.1 44,921 220 36.9 245,582 ---
37.9 1,036,496 223 37.8 14,956 220 37.6 55,241 ---

1all spectra presented one band.

2peak identified as caseargrewiin F (tR= 16.9 min; λmax= 235 nm).

3values in italic indicates that peak area< 106 for this specimen.

TABLE V Data from HPLC-DAD analyses of specimens AGS43 and AGS51. Retention time, area and λmax of selected peaks (tR> 10 min; area >106 in at least one specimen of the group) are presented. 

AGS43 AGS51
tR (min) area λmax 1(nm) tR (min) area λmax (nm)
10.7 2,444,373 234 10.7 551,446 231
12.8 2,667,364 234 --- --- ---
13.4 2,884,543 234 --- --- ---
14.5 1,364,805 233 14.3 197,898 231
15.0 6,532,573 238 --- --- ---
15.9 14,370,840 234 16.2 1,322,891 234
16.4 2,578,648 234 --- --- ---
16.8 2 2,388,160 236 16.6 2 2,111,535 237
18.0 1,430,820 231 17.7 302,861 233
19.1 2 2,020,369 234 18.8 2 2,741,439 234
--- --- --- 20.1 6,083,237 234
20.7 6,040,123 234 --- --- ---
21.6 2 1,475,264 233 21.3 2 317,727 232
23.3 1,245,694 231 23.0 1,759,548 234
28.2 2,392,835 234 --- --- ---
29.8 1,090,286 227 29.6 103,058 227
--- --- --- 31.9 1,228,921 234
33.1 5,187,343 230 32.8 1,505,320 234
35.1 1,660,173 259 34.9 184,321 258
35.9 1,254,948 233 35.7 335,305 230

1all spectra presented one band.

2peaks identified as caseargrewiin F (tR= 16.9 min; λmax= 235 nm), casearin B (tR= 19.0 min; λmax= 233 nm) or casearin X (tR= 21.4 min; λmax= 234 nm).

3values in italic indicates that peak area< 106 for this specimen.

TABLE VI Data from HPLC analyses of specimens AGS101-104. Retention time, area and λmax of selected peaks (tR > 10 min; area >107 in at least one specimen of the group) are presented. 

AGS101 AGS102 AGS103 AGS104
tR (min) area λmax 1(nm) tR (min) area λmax (nm) tR (min) area λmax (nm) tR (min) area λmax (nm)
11.5 51,753,295 232 11.5 41,903,478 234 11.4 63,905,455 232 11.5 35,911,329 232
14.9 2,274,634 237 15.1 4,923,216 235 14.9 12,408,073 238 15.0 10,271,162 235
16.3 8,262,055 234 16.3 27,280,273 231 16.2 19,190,603 233 16.1 51,263,748 232
16.7 2 3,172,351 235 16.7 2 2,946,438 237 16.6 2 11,387,481 237 16.6 2 6,483,562 237
18.9 2 16,510,122 233 18.9 2 4,863,225 234 18.8 2 31,961,624 232 18.8 2 14,334,030 233
20.2 39,245,812 232 20.2 20,544,230 233 20.2 30,553,286 232 20.1 40,426,106 232
21.5 2 602,260 234 21.6 2 2,524,503 234 21.4 2 3,562,338 235 21.5 2 2,283,234 234
23.1 15,510,748 234 23.1 5,300,509 235 23.1 11,112,349 234 23.0 11,399,559 234
32.0 14,119,935 234 31.9 1,418,784 235 31.9 7,955,250 234 31.9 1,592,905 234
33.0 10,990,895 234 32.8 5,918,022 234 32.8 18,209,028 232 32.8 2,665,132 234

1all spectra presented one band.

2peaks identified as caseargrewiin F (tR= 16.9 min; λmax= 235 nm), casearin B (tR= 19.0 min; λmax= 233 nm) or casearin X (tR= 21.4 min; λmax= 234 nm).

3peak area values in italic highlights that peak area< 107 for this specimen.

DISCUSSION

The morpho-anatomical comparison between the varieties revealed differences only in the paradermic sections. The shape of epidermic cell walls (polygonal in var. sylvestris and rounded in var.lingua) and stomata distribution (var.sylvestris is hypostomatic and var. lingua is amphistomatic) are characteristics that can be applied in the differentiation of the varieties as well as the palisade index. According Costa (2001) the palisade index is less affected by environmental factors than stomatal index. These results are interesting for the pharmaceutical quality control application because the analysis of the powdered drug will lead to the identification of the varieties. Obviously, the assays will be applied to more representative number of specimens from different environments or regions to be validated.

Data from HPLC-DAD analyses (tR and UV spectrum) allowed to classify the specimens in three groups. In the first group - AGS38, AGS44 and AGS45 (var. lingua) - we found the following common characteristics: identification only of caseargrewiin F, predominance of peaks with λmax= 221-228 nm (22-23 peaks and total peak area of 22-55 × 106), and seven common main peaks with area > 106 (Tables III andIV). In TLC analyses caseargrewiin F was not identified in AGS38 probably due its minor concentration as demonstrated by HPLC analysis (small peak area).

In the second group - AGS43 and AGS51 (var.lingua) - caseargrewiin F, casearins B and X were identified. In the TLC analyses, diterpenes were not identified as discussed above. The peaks with λmax= 231-238 nm have greater area (16-17 peaks and total peak area of 21-53 × 106) than peaks with λmax= 221-228 nm (6-8 peaks and total peak area of 0.8-2.4 × 106) (Table III). Finally, there are five common main peaks with area > 106 (Table V) in their chromatograms.

The third group includes AGS101-104 (var.sylvestris). In this group the peaks with λmax= 231-238 nm predominate notably in number of peaks (24-33) and total peak area (142-242 × 106) in comparison with all specimens of var. lingua (Table III). The three diterpenes were identified in these specimens and they have six common main peaks with area > 4 × 106 (Table VI). In the TLC analysis, casearin B was not identified as discussed above.

The specimen AGSDER presented characteristics of different groups. Its chromatogram demonstrated that peaks with λmax= 221-228 nm predominate in number (13) but no differences were observed for peak total area (8 × 106) considering the two ranges of λmax. Casearin B and caseargrewiin F were identified in HPLC-DAD analysis.

The results obtained suggest the predominance of clerodane diterpenes, especially with λmax= 231-238 nm, in C. sylvestris var. sylvestris. Moreover, there is a greater total area of peaks with tR< 5 min in the chromatograms of specimens of C. sylvestris var. lingua and AGSDER (var. sylvestris) than in chromatograms of AGS101-104 (var. sylvestris) indicating greater concentration of polar compounds (e.g. phenolics) as demonstrated in previous work (Cavallari 2008, Silva et al. 2006). AGSDER was in an urban area subjected to pollutants and it may be correlated with its different chemical pattern.

As morpho-anatomical analyses, the chemical analyses by HPLC-DAD have to be applied to greater number of specimens from different environments or regions to give more conclusive results.

In conclusion, this work indicates that chemical analyses, mainly HPLC-DAD, besides morpho-anatomical analyses of paradermic sections and palisade index can be applied in distinction of C. sylvestris varieties for botanical or pharmaceutical purposes.

Acknowledgements

The authors are grateful to the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Fundação para o Desenvolvimento da UNESP (FUNDUNESP), Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), and Instituto Florestal da Secretaria do Meio Ambiente do Estado de São Paulo for support of the project.

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Received: January 19, 2012; Accepted: February 27, 2013

André Gonzaga dos Santos E-mail:santosag@fcfar.unesp.br

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