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1.
We aimed in the present study to investigate the chemical composition, the antioxidant capacities as well as the in vitro fermentation properties of Salvia officinalis leaves aqueous extract (SOLAE) grown in four regions of northwestern Tunisia. Our data firstly indicated a spatial variation (P<0.05) in condensed tannins, total lipids, polyphenols and flavonoids contents. The HPLC‐PDA‐ESI‐MS/MS‐LC/HR‐ESI‐MS technique allowed to the identification of 13 phenolic compounds and showed that protocatechuic acid is the major constituent of the plant leaves grown in Tabarka, Ain Draham and Testour. The SOLAE of the plant grown in Tabarka presents the most potent scavenging activity against DPPH radical and had the highest percentage of inhibition. More importantly, we found in the present study that the digestibility of dry matter and in vitro fermentation showed a significant variation between the regions and the animal species. Also, we showed a very positive correlation between antioxidant properties and phenolic compounds contents. In conclusion, we suggest that SOLAE had potential beneficial effects owing in part to its antioxidant and ROS scavenging activities. Therefore, S. officinalis can be proposed as an additive food for animals’ nutrition and health.  相似文献   

2.
Schinus lentiscifolius Marchand has been used in folk medicine to treat immunoinflammatory related diseases, which are marked by OS and altered HSR. Our study aimed to evaluate OS and HSR in lymphocytes treated with S. lentiscifolius bark extracts. S. lentiscifolius barks were partitioned with solvents to obtain hexane (SL‐HEX), ethyl acetate (SL‐ACOET) and methanol (SL‐MEOH) extracts, and the presence of bioactive compounds was evaluated by thin layer chromatography. Total phenols were measured by the Folin–Ciocalteu method and flavonoids were identified by HPLC‐DAD‐ESI‐MS/MS. Antioxidant capacity was verified by DPPH method, cell viability by Trypan Blue method, lipid peroxidation by TBARS and HSP70 by immunoblotting. The SL‐ACOET extract presented higher content of phenolic compounds and antioxidant activity in vitro. It was able to reduce lipid peroxidation levels in lymphocytes induced by H2O2 and improved cell viability. The SL‐ACOET extract inhibited HSR by a decrease in both intracellular content and release of 70 kDa heat shock proteins (HSP70) and also by decrease extra‐to‐intracellular HSP70 ratio in lymphocytes submitted to heat shock (2 h, 41 °C). S. lentiscifolius bark extract has antioxidant activity and inhibitory effect on HSR probably due to the presence of polyphenols as the flavonoids quercetin and kaempferol.  相似文献   

3.
Introduction –  The extract of Crataegus monogyna shows sedative, hypotensive, vasodilator and cardio‐tonic actions. Although several papers dealing with the extraction of metabolites from Crataegus have been published, the plant productivity in terms of bioactive compounds is not easily understandable as yet. Objective –  To investigate the influence of the extraction mode on the yield of bioactive compounds from Crataegus monogyna Jacq. in order to evaluate plant productivity. Methodology –  Samples were prepared by extraction of powdered material obtained from top branches, flowers and leaves. Soxhlet extraction, maceration and ultrasound‐ and microwave‐assisted extraction at different experimental conditions were investigated for the exhaustive extraction of hyperoside, vitexin and vitexin‐2′′‐O‐rhamnoside. The phytocomponents were identified and quantified by HPLC‐UV/PAD, comparing HPLC retention times and UV spectra of individual peaks with those of the standards analysed under the same conditions. Results –  An easy‐to‐use HPLC isocratic method suitable for the quantification of hyperoside, vitexin and vitexin‐2′′‐O‐rhamnoside in raw plant extracts was developed. The optimised HPLC methodology was applied to evaluate different extraction procedures. The ultrasound and microwave‐assisted extraction protocols showed higher extraction efficiency than the others. In particular, the optimised microwave protocol gave rise to the highest extraction efficiency with high reproducibility. Conclusions –  A microwave protocol combined with isocratic HPLC analysis is proposed for the rapid screening of plant materials collected in different environmental conditions in order to evaluate the productivity of Crataegus monogyna Jacq. and to find out the best ecological conditions to cultivate hawthorn in Northern Italy. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

4.
Introduction  – Two recent mass spectrometry‐based reports concerning Senecio scandens yielded remarkably dissimilar pyrrolizidine alkaloid constituents. In both studies, and in a related analysis of Senecio scandens and Tussilago farfara using micellar electrokinetic chromatography, the presence of hazardous N‐oxides of the alkaloids was either not considered or was inadequately considered. This raises concerns about the effectiveness of the methodologies used in these, and similar, studies in assessing the pyrrolizidine alkaloid content and the safety of food, food supplements and medicines for human use. Objective  – To highlight essential analytical requirements for confident assessment of pyrrolizidine alkaloid‐related safety of food and herbal products for human use. Methodology  – Direct infusion‐ESI MS and HPLC‐ESI MS were used to analyse samples derived from liquid–liquid partitioning experiments and from strong cation exchange, solid‐phase extraction of pyrrolizidine alkaloids and their N‐oxides. Results  – A simple solvent partitioning experiment using pure senecionine and senecionine‐N‐oxide, two constituents reported in one of the mass spectrometry‐based studies of S. scandens, clearly demonstrated the inadequacy of the reported method to detect and quantitate hazardous pyrrolizidine alkaloid N‐oxide components. A preliminary LCMS analysis of commercially‐prepared extracts of comfrey roots (Symphytum officinale and S. uplandicum s. l.) was used as a model to highlight the analytical importance of N‐oxides in the safety assessment of pyrrolizidine alkaloid‐containing medicinal herbs. Conclusions  – This study highlighted significant differences in the reported identification of pyrrolizidine alkaloids from the same plant species, and clearly demonstrated the inadequacy of some procedures to include N‐oxides in the assessment of pyrrolizidine alkaloid‐related safety of food and herbal products. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

5.
Introduction – Blueberries (genus Vaccinium) have gained worldwide focus because of the high anthocyanin content of their fruits. In contrast, the leaves of blueberry have not attracted any attention, even though they contain large quantities of chlorogenic acid, a strong antioxidant compound. Objective – The aim of this investigation was the quantification and preparative isolation of chlorogenic acid (5‐caffeoylquinic acid, 5‐CQA) from blueberry leaves using a new separation scheme, centrifugal partition chromatography (CPC). Methodology – A water fraction containing a high concentration of 5‐CQA (14.5% of dry weight extract) was obtained by defatting a crude methanol extract from blueberry leaves. CPC was applied to isolate 5‐CQA from this water fraction using a two‐phase solvent system of ethyl acetate–ethanol–water at a volume ratio 4:1:5 (v/v/v). The flow‐rate of mobile phase was 2 mL/min with the ascending mode while rotating at 1200 rpm. The eluate was monitored at 330 nm. The structure of chlorogenic acid in the CPC fraction was confirmed with HPLC, UV, ESI/MS and NMR spectra. Results – The HPLC chromatogram showed that the fractions collected by CPC contained chlorogenic acid with 96% purity based on peak area percentage. The total amount of chlorogenic acid isolated from 0.5 g of a water fraction was 52.9 mg, corresponding to 10.6% of the water fraction. The isolated compound was identified successively as 5‐CQA with MS (parent ion at m/z 355.1 [M + H]+) and 1H NMR spectra [caffeoyl moiety in the down field (δ 6.0–8.0 ppm) and quinic acid moiety in the up field (δ 2.0–5.5 ppm)]. Conclusion – 5‐CQA was successfully isolated from blueberry leaves by the CPC method in a one‐step procedure, indicating a further potential use for blueberry leaves. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

6.
Plant material is a rich source of valuable compounds such as flavanones. Their different forms influence bioavailability and biological activity, causing problems with the selection of plant material for specific purposes. The purpose of this research was to determine selected flavanone (eriodictyol, naringenin, liquiritigenin, and hesperetin) enantiomer contents in free form and bonded to glycosides by an RP‐UHPLC‐ESI‐MS/MS method. Different parts (stems, leaves, and flowers) of goldenrod (Solidago virgaurea L.), lucerne (Medicago sativa L.), and phacelia (Phacelia tanacetifolia Benth.) were used. The highest content of eriodictyol was found in goldenrod flowers (13.1 μg/g), where it occurred mainly as the (S)‐enantiomer, and the greatest proportion of the total amount was bonded to glycosides. The richest source of naringenin was found to be lucerne leaves (4.7 μg/g), where it was mainly bonded to glycosides and with the (S)‐enantiomer as the dominant form. Liquiritigenin was determined only in lucerne, where the flowers contained the highest amount (1.2 μg/g), with the (R)‐enantiomer as dominant aglycone form and the (S)‐enantiomer as the dominant glycosylated form. The highest hesperetin content was determined in phacelia leaves (0.38 μg/g), where it was present in the form of a glycoside and only as the (S)‐enantiomer. A comparison of the different analyte forms occurring in different plant parts was performed for the first time.  相似文献   

7.
Globba schomburgkii Hook.f. is an ornamental plant that has recently found increasing demand as cut flowers, hence generating a significant number of by‐products from different parts of the plant. To investigate the further applications of these by‐products, twelve crude extracts from rhizomes, stalks, leaves, and flowers were prepared by serial exhaustive extraction. The volatile composition of these extracts was analyzed by GC/MS; a total of 89 compounds were identified, most of which were sesquiterpenes as well as some labdane‐type diterpenes. The antimicrobial activities of these extracts were evaluated, revealing a correlation between the terpenoid content and antibacterial activities. Notably, the dichloromethane extracts of rhizomes and flowers, which contained the highest amount of terpenoids (e. g., α‐gurjunene, guaia‐9,11‐diene, γ‐bicyclohomofarnesal, β‐caryophyllene, and caryophyllene oxide), displayed the most prominent antibacterial activities. This work demonstrates the potential use of the crude extracts from G. schomburgkii as natural antibacterial ingredients for pharmaceutical and other applications.  相似文献   

8.
The present study is aimed at the evaluation of the phytochemical profile and the biochemical properties of methanolic extracts obtained from different parts of Rumex algeriensis and Rumex tunetanus, two relict species limited to the North Africa. Phytochemical analyses of these extracts were performed using standard colorimetric procedures, HPLC‐DAD, and HPLC‐DAD‐ESI/MS, and their antioxidant/free radical scavenging capability was estimated through several in vitro cell‐free assays. Moreover, the anti‐inflammatory potential of these extracts was demonstrated in an in vitro model of acute intestinal inflammation using differentiated Caco‐2 cells. The results showed that all the extracts appeared endowed with excellent antioxidant/free radical scavenging properties. In particular, the extracts from both R. algeriensis and R. tunetanus flowers, and that from R. algeriensis stems were characterized by a remarkable SOD‐like and NO‐scavenging activity, as well as by the capability to protect albumin against HClO‐induced degradation. Furthermore, the extracts from flowers of both Rumex species, as well as R. algeriensis stems, showed an anti‐inflammatory effect in intestinal epithelial cells, as demonstrated by the inhibition of TNF‐α‐induced gene expression of IL‐6 and IL‐8. In conclusion, R. algeriensis and R. tunetanus have shown to be potential sources of bioactive products to be used in the prevention and treatment of pathologies related to oxidative stress and inflammation.  相似文献   

9.
This study is the first to investigate the chemical composition of barks essential oil (EO), secondary metabolites and biological activities of the MeOH and infusions extracts of seeds, leaves, barks and roots of Calligonum azel Maire (Polygonaceae) harvested from Tunisian desert. The gas chromatography/mass spectrometry (GC/MS) results showed the presence of fifty‐four compounds in barks EO. The major components were: viridiflorol (14.6%), α‐eudesmol (8.65%), trans‐caryophyllene (6.72%), elemol (6.63%), β‐eudesmol (6.21%). The obtained results showed that C. azel is a very rich plant in secondary metabolites. High contents in polyphenols, flavonoids and tannins were observed in both extracts of all studied organs. Significant differences were found between both extracts of the four organs. Thus, polyphenols and tannins were more abundant in leaves infusion extract, while, flavonoids showed a high level in barks extract. The antioxidant activity data demonstrated that all extracts showed strong antioxidant and radical scavenging activities. The MeOH extracts presented potential for antibacterial and antifungal activities against all tested microorganisms. The inhibition zones diameters and minimal inhibitrice concentration values were in the range of 9 – 15 mm and 2.5 – 20 μg/ml, respectively. This study demonstrated that C. azel can be regarded as an excellent plant source for natural antimicrobial agents.  相似文献   

10.
Introduction  – Jasmonic acid (JA), abscisic acid (ABA) and indole‐3‐acetic acid (IAA) are important plant hormones. Plant hormones are difficult to analyse because they occur in small concentrations and other substances in the plant interfere with their detection. Objective  – To develop a new, inexpensive procedure for the rapid extraction and purification of IAA, ABA and JA from various plant species. Methodology  – Samples were prepared by extraction of plant tissues with methanol and ethyl acetate. Then the extracts were further purified and enriched with C18 cartridges. The final extracts were derivatised with diazomethane and then measured by GC‐MS. The results of the new methodology were compared with those of the Creelman and Mullet procedure. Results  – Sequential elution of the assimilates from the C18 cartridges revealed that IAA and ABA eluted in 40% methanol, while JA subsequently eluted in 60% methanol. The new plant hormone extraction and purification procedure produced results that were comparable to those obtained with the Creelman and Mullet's procedure. This new procedure requires only 0.5 g leaf samples to quantify these compounds with high reliability and can simultaneously determine the concentrations of the three plant hormones. Conclusion  – A simple, inexpensive method was developed for determining endogenous IAA, ABA and JA concentrations in plant tissue. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

11.
A collection of nine Myrtus communis samples from different localities of Sicily was evaluated. Morphological traits and production characteristics have been chosen as parameters to arrange the samples into homogeneous groups and to identify the best biotypes for possible future agro‐industrial exploitation. The plant material has been subjected to taxonomic characterization from biometric and phytochemical perspectives. Myrtle berries and leaves have been analyzed for their content in metabolites, applying a cascade extraction protocol for M. communis leaves and a single hydroalcoholic extraction for berries, whereas hydrodistillation procedures have been applied to obtain the essential oils from berries and leaves. The analyses of non‐volatile components were carried out by LC‐UV‐DAD‐ESI‐MS. All the extracts were characterized by the presence of numerous polyphenols, namely highly hydroxylated flavonols such as quercetin and myricetin; and ellagic acid detected in all samples. In addition, myrtle berries contained nine different anthocyanins, namely delphinidin, petunidin, cyanidin and malvidin derivatives. The essential oils (EOs) were analyzed by a combination of GC‐FID and GC/MS. A total of 33 and 34 components were fully characterized with the predominance of α‐pinene, myrtenyl acetate, linalool, 1,8‐cineole and linalyl acetate. All phytochemical profiles were subjected to cluster analyses, which allowed subdividing the myrtle samples in different chemical groups.  相似文献   

12.
Sesbania bispinosa belongs to the family Fabaceae contains appreciable percentage of antidiabetic cyclitol known as (+)-pinitol. A rapid high-performance liquid chromatography method has been developed for estimating the pinitol content in methanol extracts of S. bispinosa (roots, stems, leaves, flowers and pods) with respect to its harvesting age. Chromatographic separation was carried out on XBridge Amide column (250 mm x 4.6 mm, 3.5 μm coating) using isocratic elution of solvent system comprising water: acetonitrile (80:20) and water: acetonitrile (30:70) with 0.2% triethylamine at 30°C. The RP-HPLC-PDA-RI and LC-MS/MS analyses have shown significant variations of pinitol content in roots, stems, leaves, flowers, and pods extracts of S. bispinosa with respect to a particular harvesting age. At pre-fruiting stage, the highest percentage of pinitol was detected in all the parts of the plant extracts (roots: 2.72%, stems: 2.81%, leaves: 2.32% and pods: 3.92%). Therefore, it is recommended to harvest the plant at pre-fruiting stage for getting highest amounts (0.16%) of total pinitol. As a result, the pinitol content might be employed as a reference marker to decide the harvesting age of S. bispinosa.  相似文献   

13.
In the current study, antioxidant, antibacterial activities, and the phenolic compositions of extracts from Helianthemum canum L. Baumg . (Apiaceae) aerial parts were investigated for the first time. The H canum was extracted with 70% methanol (HCM eOH ) and water (HCW ). Both extracts were determined by total phenolic contents (3 mg/ml), flavonoids (1.5 mg/ml), flavonols (1.5 mg/ml), qualitative–quantitative compositions, iron (II ) chelation activities (0.1 – 5 mg/ml), free radical scavenging activities (DPPH ?: 0.01 – 0.6 mg/ml and ABTS +?: 0.125 – 0.5 mg/ml) and the effect upon inhibition of β ‐carotene/linoleic acid co‐oxidation (1 mg/ml). The peroxidation level was also determined using the thiobarbituric acid method (0.01 – 1.5 mg/ml). The results of the activity tests given as IC 50 values were estimated from non‐linear algorithm and compared with standards. Antibacterial activities of extracts and standards were evaluated against Gram‐ negative and ‐positive ten standard strains using disc diffusion and broth microdilution methods. The MIC results (312.5 – 2500 μg/ml) against tested microorganisms varied from 625 to 2500 μg/ml. In HPLC analysis, 3,5‐dihydroxybenzoic acid was found as the main substance in both extracts. These results showed that HCM eOH was richer in phenolic compounds (284.13 ± 0.30 mg GAE /g extract) from HCW (244.55 ± 0.35 mg GAE /g extract). In conclusion, H canum extracts showed in vitro antibacterial and antioxidant activities.  相似文献   

14.

Introduction

The tuberous roots of Stephania kwangsiensis, which contain bioactive alkaloids, are used as a traditional Chinese medicine. Overexploitation of the roots has made the plant increasingly rare, and the abundant leaves of the same plant may offer a potential alternative. However, there is insufficient phytochemical information for a comparison of alkaloid compositions in the two parts.

Objective

To characterise and compare the alkaloids in the leaves and roots of S. kwangsiensis.

Methods

The alkaloids in S. kwangsiensis were characterised using high pressure liquid chromatography coupled with positive electrospray ionisation quadrupole time‐of‐flight tandem mass spectrometry (HPLC‐(+)ESI‐QTOF‐MS/MS). The alkaloid compositions in the leaves and roots were compared by visual inspection combined with principal component analysis (PCA) of the HPLC‐MS data.

Results

Seventy‐five alkaloids comprising aporphine‐, proaporphine‐, protoberberine‐, benzylisoquinoline‐, bisbenzylisoquinoline‐ and morphine‐type alkaloids were identified or tentatively identified in the roots and leaves of S. kwangsiensis. Sixty‐three of these alkaloids have not been previously reported in this species, and three have not been previously reported in the literature. The roots and leaves had similarities in alkaloid composition but differences in the peak intensities of most alkaloids. The PCA revealed that the samples were clustered into two distinct groups, which corresponded to leaves and roots.

Conclusion

This study further clarified the chemical constituents in the roots of S. kwangsiensis, and revealed that diverse alkaloids were also present in the leaves. The comparative chemical profiling of the two parts provides useful information on their potential medicinal use. Copyright © 2017 John Wiley & Sons, Ltd.  相似文献   

15.
16.
Total flavonoid content (TFC) and cyanidin‐3‐glucoside (Cyd‐3‐glu) of seed and seed coat extract of 16 genotypes from five species of Carthamus were studied, and their major polyphenolic compounds and antioxidant activity of the seed coat extracts were determined using HPLC analysis and DPPH assay, respectively. Additionally, fatty acids composition of the seed oil was analyzed by GC. In general, TFC and Cyd‐3‐glu content of seed coat extracts were higher than those of seed extracts. A novel breeding line with black seed coat (named A82) depicted lower TFC (3.79 mg QUE/g DW) but higher Cyd‐3‐glu (24.64 mg/g DW) compared to the white and other seed‐pigmented genotypes. DPPH radical scavenging activity showed a strong association with Cyd‐3‐glu content (r = 0.84), but no correlation with TFC (r = ?0.32). HPLC analysis of seed coat extracts revealed that four compounds were dominant constituents including rutin (7.23 – 117.95 mg/100 g DW), apigenin (4.37 – 64.88 mg/100 g DW), quercetin (3.09 – 14.10 mg/100 g DW), and ferulic acid (4.49 – 30.41 mg/100 g DW). Interestingly, the genotype A82 with an appropriate polyunsaturated/saturated fatty acids index (5.46%) and a moderate linoleic fatty acid content (64.70%) had higher nutritional and pharmaceutical value than all the other genotypes.  相似文献   

17.
This study was performed in the aim to evaluate nine different extracts from Tunisian Lycium arabicum for their total phenolic and total flavonoid contents, phytochemical analyses as well as their antioxidant and anti‐lipase activities. The in vitro antioxidant property was investigated using three complementary methods (DPPH, ferric reducing antioxidant power (FRAP), and β‐carotene‐linoleic acid bleaching assays) while anti‐lipase activity was evaluated using 4‐methylumbelliferyl oleate method. From all of the tested extracts the most potent found to be the polar MeOH extracts especially those of stems and leaves. In order to investigate the chemical composition of these extracts and possible correlation of their constituents with the observed activities, an UHPLC/HR‐ESI‐MS/MS analysis was performed. Several compounds belonging to different chemical classes were tentatively identified such as rutin and kampferol rutinoside, the major constituents of the leaves, and N‐caffeoyltyramine, lyciumide A, N‐dihydrocaffeoyltyramine as well as fatty acids: trihydroxyoctadecadienoic acid and hydroxyoctadecadienoic acid isomers were detected abundantly in the stems. These results showed that the MeOH extracts of stems and leaves of Larabicum can be considered as a potential source of biological active compounds.  相似文献   

18.
Moringa oleifera is a miracle plant rich in nutrients, antioxidants, and antibiotic properties. Present study was designed to evaluate various biochemical attributes of leaves and flowers of M. oleifera. Plant parts (leaves, flowers) of M. oleifera, collected from different roadsides of Multan district, Punjab, Pakistan, were used as experimental material. Result indicates that alkaloids, saponin, carbohydrates, fats, and protein had a high value in the aqueous extract of both leaves and flowers of M. oleifera. Whereas phenol content was high in methanolic leaves extract and the phenol contents were high in aqueous extract of flowers. The extract yield of M. oleifera leaves and flowers both showed a higher percentage in aqueous extract (57.5%), followed by methanol extract and lowest in ethyl acetate extract. Flavonoids contents were higher in ethyl acetate extract of leaves (33.67%) and aqueous extract of flowers (53.71%). While crude fiber was high in methanolic extract of leaves (12.40%) and in flowers crude fiber was high in ethyl acetate extract (15.86%). The moisture contents were higher in leaves (8.87%) than flowers (7.3%) and similarly, ash percentage in flowers (52.60%) than leaves (41.84%). Ethyl acetate extracts of M. oleifera leaves show antibacterial activity against Pseudomonas aeruginosa while methanolic extract of M. oleifera flowers shows antibacterial activity against Xanthomonas sp. Maximum growth inhibits show in all extracts of leaves against Aspergillus flavus, F. oxysporum, and P. glabrum except for the concentrated aqueous extract of leaves. While in flowers maximum growth inhibits all extracts against P. glabrum, A. niger, and A. flavus except the diluted ethyl acetate extract. Phytochemicals present in different parts of moringa have significant edible and commercial potential. Moringa extracts exhibited significant antimicrobial activity, therefore have applications in pharmaceuticals.  相似文献   

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