Phytochemistry (v.62, #8)
CONTENTS OF VOLUME 62 (I-VIII).
Graphical abstracts (ix-xiv).
AUTHOR INDEX OF VOLUME 62 (IX-XIII).
Author Index (vii).
KEYWORD INDEX FOR VOLUME 62 (XV-XXII).
Publisher's Note (1171).
Tetranortriterpenoid derivatives from Turraea parvifolia (Meliaceae) by Peter K. Cheplogoi; Dulcie A. Mulholland (1173-1178).
The methanol extract of the seeds of Turraea parvifolia has yielded seven novel triterpenoid derivatives: 12α-acetoxyazadironolide, turraparvin A (12α-acetoxy-7α,23-dihydroxy-24,25,26,27-tetranor-3-oxoapotirucalla-1,14,20(22)-trien-21,23-olide), turraparvin B (12α-acetoxy-7α,21-dihydroxy-24,25,26,27-tetranor-3-oxoapotirucalla-1,14,20(22)-trien-23,21-olide), turraparvin C (7α,12α-diacetoxy-21-hydroxy-24,25,26,27-tetranor-3-oxoapotirucalla-1,14,20(22)-trien-23,21-olide), 11-epi-21-hydroxytoonacilide, 11-epi-23-hydroxytoonacilide and turraparvin D (12α-acetoxy-7α-hydroxy-24,25,26,27-tetranor-3-oxoapotirucalla-1,14,20(22)-trien-21,23-lactam).The methanol extract of the seed of Turraea parvifolia has yielded 12α-acetoxyazadironolide, 11-epi-21-hydroxytoonacilide, 11-epi-23-hydroxytoonacilide and turraparvins A, B, C and D (1).
Keywords: Meliaceae; Turraea parvifolia; 12α-Acetoxyazadironolide; Turraparvin A; Turraparvin B; Turraparvin C; 11-epi-21-Hydroxytoonacilide, 11-epi-23-Hydroxytoonacilide and turraparvin D;
Ecdysteroids and other constituents from Sida spinosa L. by Faten M.M Darwish; Manfred G Reinecke (1179-1184).
Two compounds (3 and 10) were isolated from the aerial parts of Sida spinosa L. Their structures have been established as glyceryl-1-eicosanoate and 20-hydroxy, 24-hydroxymethylecdysone by 1D and 2D-NMR techniques. In addition 12 known compounds (1, 2, 4–9 and 11–14) have been isolated and identified.Two compounds were isolated from the aerial parts of Sida spinosa L. Their structures have been established as glyceryl-1-eicosanoate and 20-hydroxy, 24-hydroxymethylecdysone by 1D and 2D-NMR techniques. In addition 12 known compounds have been isolated and identified.
Keywords: Sida spinosa L.; Malvaceae; Hydrocarbons; Fatty acid derivatives; Phenolic compound; Cerebroside; Ecdysteroids;
Sesquiterpene lactones from glandular trichomes of Viguiera radula (Heliantheae; Asteraceae) by Otmar Spring; Reinhard Zipper; Jürgen Conrad; Bernhard Vogler; Iris Klaiber; Fernando B Da Costa (1185-1189).
In addition to known compounds, the floral parts of Viguiera radula afforded two new sesquiterpene lactones. All compounds were detected in glandular trichomes, which were micromechanically collected from the anther appendages and analyzed by HPLC. Structure identification was performed by NMR and MS techniques.HPLC analysis and NMR experiments revealed the occurrence of 13 germacranolides in glandular trichome extracts of Viguiera radula. Their structures were determined by spectral analysis.
Keywords: Viguiera radula; Heliantheae; Asteraceae; Chemotaxonomy; Sesquiterpene lactones; Germacranolides;
Terpenes from Inula verbascifolia by Ahmed A. Ahmed; Abou El-Hamd H. Mohamed; Olga Tzakou; Alexandra Petropoulou; Mohamed E. Hassan; Mohamed A. El-Maghraby; Klaus-Peter Zeller (1191-1194).
The aerial parts of Inula verbascifolia afforded two new xanthanes and a new germacranolide derivative, together with the known compounds inusoniolide, 4-O-dihydroinusoniolide and 9β-hydroxyparthenolide. The structures were determined by spectral methods (IR, HRMS,1H NMR, 13C NMR, DEPT, 1H–1H COSY, HMQC and HMBC).The aerial parts of Inula verbascifolia afforded two xanthanes and a germacranolide. Their structures were elucidated by spectral methods 1H NMR, 13C NMR, 1H– 1H–COSY, HMQC and HMBC.
Eudesmane derivatives and other constituents from Saussurea parviflora by Zhong-Duo Yang; Kun Gao; Zhong-Jian Jia (1195-1199).
A survey of the whole plant of Saussurea parviflora afforded three compounds 11,12,13-trihydroxy-4(15),8-eudesmadiene-9-one, eudesman-8β,12-olide-1-O-β-d-glucoside and 1β,3β-dihydroxyursa-9(11),12-diene-3-octadecanoate, as well as 13 known compounds. Their structures were elucidated on the basis of spectral evidence, especially by using NMR spectroscopic techniques. In addition, encelin exhibited effective antitumor activity on L02, SMMC-7721 and HO-8910 cells.Sixteen compounds were isolated from Saussurea parviflora, and their structures were elucidated on the basis of spectral evidence. The antitumor activity of some compounds is described.
Keywords: Saussurea parviflora; Compositae; Eudesmane derivatives; Antitumor activity;
Further saponins from Taverniera aegyptiaca by Zedan Z Ibraheim; Hashem A Hassanean; Daoud W Bishay (1201-1205).
From the saponin fraction of the total methanolic extract of the dried root and stem barks of Taverniera aegyptiaca Boiss, six new triterpenoidal saponins of oleanane type were isolated and identified as 28-methyl serratagenate-3-β-O-β-xylopyranosyl (1→2)-β-glucopyranoside (2), 28-methyl serratagenate 3-β-O-α-rhamnopyranosyl (1→2)-β-glucopyranoside (3), 3β-O-α-rhamnopyranosyl (1→2) β-glucopyranosyl-olean-11,13(18)-dien-1β, 3β, 22β-triol (4), 3β-O-β-glucopyranosyl (1→2)-β-glucuronopyranosylolean-11,13(18)-dien-1β,3β,22β-triol (5), 3β-O-β-xylopyranosyl(1→2)-β-glucuronopyranosylolean-11,13(18)-dien-1β,3β,22β-triol (6), 3β-O-α-rhamnopyranosyl (1→2)-β-glucuronopyranosylolean-11,13(18)-dien-1β, 3β, 22β-triol (7) together with the known oleanolic acid 3-β-O-β-glucoside (1). The identification of the isolated compounds was done on the basis of chemical and spectral evidences.From the saponin fraction of the dried root and stem barks of Taverniera aegyptiaca Boiss, six new triterpenoidal saponins of oleanane type were isolated and identified. The aglycone part of the isolated compounds was based on 28-methyl serratagenate for compounds 2 and 3, and 1β, 3β, 22β trihydroxyolean-11,13(18)-diene for compounds 4, 5, 6 and 7.
Keywords: Taverniera aegyptiaca; Fabaceae; Stem and root barks; Saponins;
Ceriopsins F and G, diterpenoids from Ceriops decandra by Ammanamanchi S.R Anjaneyulu; Vadali Lakshmana Rao (1207-1211).
Two diterpenoids ceriopsin F (1) and ceriopsin G (2) were isolated from the mangrove plant Ceriops decandra.Chemical examination of the ethyl acetate solubles of the CH3OH:CH2Cl2 (1:1) extract of the roots of Ceriops decandra collected from Kauvery estuary resulted in the isolation of two more diterpenoids, ceriopsins F and G (1–2) and five known compounds, ent-13-hydroxy-16-kauren-19-oic acid (steviol, 3), methyl ent-16β,17-dihydroxy-9(11)-kauren-19-oate (4), ent-16β,17-dihydroxy-9(11)-kauren-19-oic acid (5), ent-16-oxobeyeran-19-oic acid (isosteviol, 6), 8,15R-epoxypimaran-16-ol (7). The structures of the new diterpenoids were elucidated by a study of their physical and spectral data as methyl ent-13,17-epoxy-16-hydroxykauran-19-oate (1) and ent-16-oxobeyeran-19-al (2).
Keywords: Indian mangrove; Ceriops decandra; Rhizophoraceae; Diterpenoids; Ceriopsins F and G;
Guaiane sesquiterpenes from Amoora rohituka by Rasheduzzaman Chowdhury; Choudhury M. Hasan; Mohammad A. Rashid (1213-1216).
The petroleum ether extract of the stem bark of Amoora rohituka afforded two novel guaiane-derived sesquiterpenoids, 6β,7β-epoxyguai-4-en-3-one (1) and 6β,7β-epoxy-4β,5-dihydroxyguaiane (2). The structures of 1 and 2 were determined by extensive NMR and MS analyses and by comparison of their spectral data with related compounds.The petroleum ether extract of the stem bark of Amoora rohituka afforded two novel guaiane-derived sesquiterpenoids, 6β,7β-epoxyguai-4-en-3-one (1) and 6β,7β-epoxy-4β,5-dihydroxyguaiane (2). The structures of 1 and 2 were determined by extensive NMR and MS analyses and by comparison of their spectral data with related compounds. The relative stereochemistry of the asymmetric centers in 1 and 2, except at C-5 of 2, were determined by selective 1D-NOESY experiments.
Keywords: Amoora rohituka; Meliaceae; Guaiane sesquiterpenoids;
Anthocyanins from red onion, Allium cepa, with novel aglycone by Torgils Fossen; Øyvind M. Andersen (1217-1220).
Four anthocyanins with the same novel 4-substituted aglycone, carboxypyranocyanidin, have been isolated from acidified, methanolic extracts of the edible scales as well as from the dry outer scales of red onion, Allium cepa L. The structures of 1 and 2 were identified as the 3-O-β-glucopyranoside and 3-O-(6″-O-malonyl-β-glucopyranoside) of 5-carboxypyranocyanidin, respectively. This aglycone, 5-carboxy-2-(3,4-dihydroxyphenyl)-3,8-dihydroxy-pyrano[4,3,2-de]-1-benzopyrylium, is with exception of the substitution pattern on the phenyl ring similar to carboxypyranomalvidin (vitisidin A) recently isolated from red wines. In addition to 1 and 2, two analogues of 2 methylated at the terminal carboxyl group of the acyl moiety (3) or at the aglycone carboxyl (4), respectively, were also identified. These latter compounds are most probably formed by esterification of 2 with the solvent (acidified methanol) during the isolation process. The structures were elucidated by 2D NMR spectroscopy and LC–MS.The 3-O-β-glucopyranoside and 3-O-(6″-O-malonyl-β-glucopyranoside) of 5-carboxypyranocyanidin, 1 and 2, respectively, have been isolated from acidified, methanolic extracts of red onion, Allium cepa L.
Keywords: Red onion; Allium cepa; Alliaceae; Pigmented scales; Anthocyanins; 5-Carboxypyranocyanidin; Nomenclature; 2D NMR;
Antibacterial bromophenols from the marine red alga Rhodomela confervoides by Nianjun Xu; Xiao Fan; Xiaojun Yan; Xiancui Li; Rongli Niu; C.K. Tseng (1221-1224).
Two bromophenols, together with three known compounds, were isolated from the marine alga, Rhodomela confervoides. All compounds could inhibit the growth of some bacteria, while compound 5 showed the most potent antibacterial activities.Two bromophenols, together with three known compounds, were isolated from the methanolic extract of the marine alga, Rhodomela confervoides. By means of MS and NMR spectroscopic analyses, they were identified as 3-bromo-4-[2,3-dibromo-4,5-dihydroxyphenyl] methyl-5-(hydroxymethyl) 1,2-benzenediol (1) and 3-bromo-4-[2,3-dibromo-4,5-dihydroxyphenyl] methyl-5- (ethoxymethyl) 1,2-benzenediol (2). Three known compounds were also isolated, namely 3-bromo-4-[2,3-dibromo-4,5-dihydroxyphenyl] methyl-5-(methoxymethyl) 1,2-benzenediol (3), 4,4′- methylenebis [5,6-dibromo-1,2-benzenediol] (4) and bis (2,3-dibromo-4,5-dihydroxybenzyl) ether (5). Compound 5 was the most active against five strains of bacteria with the MIC less than 70 μg/ml, while compounds 2, 3 and 4 exhibited moderate activity.
Keywords: Rhodomela confervoides; Rhodomelaceae; Red alga; Bromophenol; Antibacterial activity;
Chalcones from the seed of Cedrelopsis grevei (Ptaeroxylaceae) by Neil A. Koorbanally; Milijaona Randrianarivelojosia; Dulcie A. Mulholland; Linda Quarles van Ufford; Albert J.J. van den Berg (1225-1229).
The seed of Cedrelopsis grevei (Ptaeroxylaceae) has yielded the known compounds uvangoletin, 5,7-dimethylpinocembrin, cardamonin, flavokawin B, 2′-methoxyhelikrausichalcone, and the novel prenylated chalcones, cedreprenone and cedrediprenone. Cedridiprenone has been shown to exhibit superoxide scavenging properties.The seed of Cedrelopsis grevei (Ptaeroxylaceae) has yielded the known compounds uvangoletin, 5,7-dimethylpinocembrin, cardamonin, flavokawin B, 2′-methoxyhelikrausichalcone, and the novel prenylated chalcones, cedreprenone and cedrediprenone. Cedrediprenone has been shown to exhibit superoxide scavenging properties.
Keywords: Cedrelopsis grevei; Ptaeroxylaceae; Chalcone; Uvangoletin; 5,7-Dimethylpinocembrin; Cardamonin; Flavokawin B; 2′-Methoxyhelikrausichalcone; Cedreprenone; Cedrediprenone; Superoxide scavenger;
Acetylated phenolic glycosides from Harpagophytum procumbens by Namboole Moses Munkombwe (1231-1234).
Two acetyl phenolic glycosides, 6-acetylacteoside and 2,6-diacetylacteoside, were obtained from commercially available secondary roots of Harpagophytum procumbens and were identified using spectroscopic methods.6-O-Acetylacteoside and 2,6-di-O-acetylacteoside were isolated from secondary roots of Harpagophytum procubens and characterized using spectroscopic techniques.
Keywords: Harpagophytum procumbens; Pedaliaceae; Acetylated phenolic glycosides;
Antiviral flavonoids from the root bark of Morus alba L. by Jiang Du; Zhen-Dan He; Ren-Wang Jiang; Wen-Cai Ye; Hong-Xi Xu; Paul Pui-Hay But (1235-1238).
A prenylated flavonoid, moralbanone, along with seven known compounds kuwanon S, mulberroside C, cyclomorusin, eudraflavone B hydroperoxide, oxydihydromorusin, leachianone G and α-acetyl-amyrin were isolated from the root bark of Morus alba L. Leachianone G showed potent antiviral activity (IC50=1.6 μg/ml), whereas mulberroside C showed weak activity (IC50=75.4 μg/ml) against herpes simplex type 1 virus (HSV-1). Their structures were elucidated by spectroscopic methods.A prenylated flavonoid, moralbanone, along with seven known compounds were isolated from the root bark of Morus alba L. Leachianone G showed potent antiviral activity (IC50=1.6 μg/ml), whereas mulberroside C showed weak activity (IC50=75.4 μg/ml) against herpes simplex type 1 virus (HSV-1).
Keywords: Morus alba; Moraceae; Moralbanone; Leachianone; Mulberroside; Flavonoid; Antiviral; Herpes;
6-Hydroxypelargonidin glycosides in the orange–red flowers of Alstroemeria by Fumi Tatsuzawa; Norio Saito; Naho Murata; Koichi Shinoda; Atsushi Shigihara; Toshio Honda (1239-1242).
Two 6-hydroxypelargonidin glycosides were isolated from the orange–red flowers of Alstroemeria cultivars, and determined to be 6-hydroxypelargonidin 3-O-(β-d-glucopyranoside) and 3-O-[6-O-(α-l-rhamnopyranosyl)-β-d-glucopyranoside], respectively, by chemical and spectroscopic methods. In addition, five known anthocyanidin glycosides, 6-hydroxycyanidin 3-malonylglucoside, 6-hydroxycyanidin 3-rutinoside, cyanidin 3-malonylglucoside, cyanidin 3-rutinoside and pelargonidin 3-rutinoside were identified in the flowers.Two 6-hydroxypelargonidin glycosides were isolated from the orange–red flowers of Alstroemeria cultivars.
Keywords: Alstroemeriaceae; Alstroemeria cultivars; Flower colour; Anthocyanin; 6-Hydroxypelargonidin (aurantinidin); 6-Hydroxypelargonidin 3-rutinoside; 6-Hydroxypelargonidin 3-glucoside;
Eryvarins F and G, two 3-phenoxychromones from the roots of Erythrina variegata by Hitoshi Tanaka; Miyuki Hirata; Hideo Etoh; Hiroshi Shimizu; Magoichi Sako; Jin Murata; Hiroko Murata; Dedy Darnaedi; Toshio Fukai (1243-1246).
Two 3-phenoxychromones, eryvarins F and G, were isolated from the roots of Erythrina variegata. Their structures were established to be 3-(2,4-dihydroxyphenoxy)-7-hydroxy-6,8-di(3,3-dimethylallyl)chromen-4-one and 3-(2,4-dihydroxyphenoxy)-8-(3,3-dimethylallyl)-2,2-dimethylpyrano[5,6:6,7]chromen-4-one on the basis of spectroscopic and chemical evidence. Eryvarins F and G are unusual 3-phenoxychromone derivatives with two isoprenoid groups.Two 3-phenoxychromones, eryvarins F (1) and G (2), were isolated from the roots of Erythrina variegata.
Keywords: Erythrina variegata; Leguminosae; Chromones; 3-Phenoxychromones; Eryvarins F and G;
Acylated phenolic glycosides from Solenostemma argel by M.S Kamel (1247-1250).
From the aerial parts of Solenostemma argel, four new acylated phenolic glycosides sinapyl alcohol 9-O-feruloyl-4-O-α-rhamnopyranosyl-(1→2)-β-glucopyranoside, solargin I (1), sinapyl alcohol 9-O-caffeoyl-4-O-α-rhamnopyranosyl-(1→2)-β-glucopyranoside, solargin II (2), sinapyl alcohol 9-O-feruloyl-4-O-α-rhamnopyranosyl-(1→2)-α-rhamnopyranosyl-(1→2)-β-glucopyranoside, solargin III (3) and sinapyl alcohol 9-O-caffeoyl-4-O-α-rhamnopyranosyl-(1→2)-α-rhamnopyranosyl-(1→2)-β-glucopyranoside, solargin IV (4) have been isolated. The structures of the isolated compounds were verified by means of MS and NMR spectral analyses.From the aerial parts of Solenostemma argel, four acylated phenolic glycosides, solargins I–IV were isolated and identified by MS and advanced NMR spectral techniques.
Keywords: Solenostemma argel; Asclepiadaceae; Phenolic glycosides; Solargins I–IV;
Muscanone: a 3-O-(1″, 8″, 14″-trimethylhexadecanyl)naringenin from Commiphora wightii by Majekodunmi O. Fatope; Suad Khamis S. Al-Burtomani; John O. Ochei; Abdulrahman O. Abdulnour; Salma M.Z. Al-Kindy; Yoshio Takeda (1251-1255).
A new antifungal flavanone, muscanone (1), was isolated along with known naringenin (2) from Commiphora wightii (Arn.) Bhandari (Burseraceae) by directing the fractionation of an EtOH extract of the air-dried trunk of C. wightii with microbial sensitivity assay. The structures of 1 and 2 were determined from EIMS, HREIMS, DEPT, 1H–1H COSY, HSQC and HMBC spectral data. Muscanone (1) was identified as 3-O-(1″, 8″,14″-trimethylhexadecanyl)naringenin and was found to be active against Candida albicans. The isolation, structure elucidation, NMR spectral assignments, and bioactivities of 1 and 2 are reported.Muscanone (1) together with naringenin (2) have been isolated from the trunk of C. wightii. Muscanone inhibited the growth of Candida albicans at 250 μg/ml.
Keywords: Commiphora wightii; Burseraceae; Flavanone; Antifungal activity; Brine shrimp lethality test; Structure elucidation;
Ipobscurines C and D: macrolactam-type indole alkaloids from the seeds of Ipomoea obscura by Kristina Jenett-Siems; Robert Weigl; Macki Kaloga; Jutta Schulz; Eckart Eich (1257-1263).
Separation of the methanolic seed extract of Ipomoea obscura afforded five indole alkaloids, three of them (ipobscurines B-D) being new natural products of a unique structural type characterized as serotonin hydroxycinnamic acid amide-type conjugates with a second phenylpropanoid moiety forming an ether with the 5-OH position of the indole nucleus. Due to an oxidative phenolic coupling between the two phenylpropanoid moieties of the supposed precursor ipobscurine B two 21-membered macrolactams with a phenol ether partial structure are formed: the trans–cis isomers ipobscurines C and D. Their structures were established on the basis of spectral data. Moreover, total synthesis of the racemic erythro- and threo-ipobscurine B 4′,4″-dimethyl ethers and the comparison with the corresponding derivative of natural (−)-ipobscurine B proved an erythro configuration of the latter.Ipobscurines C and D are macrocyclic serotonin-neolignanoid-type lactams; structure elucidation was achieved by spectral data. The acyclic lactam B is a putative precursor; total synthesis of its 4,4′-dimethyl ether and corresponding derivatisation of natural B supported the structure and proved an erythro-configuration.
Keywords: Ipomoea obscura; Convolvulaceae; Indole alkaloids; Serotonin; Hydroxycinnamic acid amide-type conjugates; Ipobscurines; Neolignans;
Tetrahydroisoquinoline alkaloids and 2-deoxyribonolactones from Aristolochia arcuata by Maurı́cio C Francisco; Ana Lucia M Nasser; Lucia M.X Lopes (1265-1270).
2-Deoxyribonolactones and four tetrahydroisoquinoline alkaloids were isolated from the acetone extract of the leaves of Aristolochia arcuata Mast., together with pinitol, sequoyitol, glycerol, fructose, sucrose, eupomatenoid-7, salsolinol, and 6,7-dihydroxy-1,1-dimethyl-1,2,3,4-tetrahydroisoquinoline. Their structures were determined on the basis of spectroscopic methods, mainly using 1H, 13C, 15N, and 31P NMR.Four tetrahydroisoquinoline alkaloids and one 2-deoxyribonolactone were isolated from the leaves of Aristolochia arcuata, together with known compounds. Their structures were determined on the basis of spectroscopic methods, mainly using 1H, 13C, 15N, and 31P NMR.
Keywords: Aristolochia arcuata; Aristolochiaceae; Tetrahydroisoquinoline alkaloids; 2-Deoxyribonolactones;
A flavone and an unusual 23-carbon terpenoid from Andrographis paniculata by Muntha K Reddy; Mopuru V.B Reddy; Duvvuru Gunasekar; Madugula M Murthy; Cristelle Caux; Bernard Bodo (1271-1275).
Phytochemical investigation of the roots and aerial parts of Andrographis paniculata Nees yielded a new flavone, 5-hydroxy-7,2′,6′-trimethoxyflavone and an unusual 23-carbon terpenoid, 14-deoxy-15-isopropylidene-11,12-didehydroandrographolide together with five known flavonoids and four known diterpenoids. The structures of these compounds were determined on the basis of spectral and chemical studies.Phytochemical investigation of the roots and aerial parts of Andrographis paniculata Nees yielded a new flavone, 5-hydroxy-7,2′,6′-trimethoxyflavone and an unusual 23-carbon terpenoid, 14-deoxy-15-isopropylidene-11,12-didehydroandrographolide together with five known flavonoids and four known diterpenoids.
Keywords: Andrographis paniculata; Acanthaceae; Flavonoids; Terpenoids;
Further constituents from Caralluma negevensis by Ammar Bader; Alessandra Braca; Nunziatina De Tommasi; Ivano Morelli (1277-1281).
Two new megastigmane glycosides (1 and 2) and two new flavone glycosides (3 and 4) were isolated from the methanol extract of the whole plant of Caralluma negevensis Zohary (Asclepiadaceae). The structures of the isolated compounds were characterized as (9R)-2β,9-dihydroxymegastigma-4,7-dien-3-one-9-O-α-l-rhamnopyranosyl-(1→6)-β-d-glucopyranoside (1), 2β,9-dihydroxymegastigma-4-en-3-one 9-O-α-l-rhamnopyranosyl-(1→6)-β-d-glucopyranoside (2), luteolin 3′-O-β-d-glucopyranoside-4′-O-α-l-rhamnopyranosyl-(1→2)-β-d-glucopyranoside (3), and luteolin 3′,4′-di-O-β-d-glucopyranoside (4). The structures of the isolated compounds were established on the basis of spectral evidence and chemical transformation.Two new megastigmane glycosides (1 and 2) and two new flavone glycosides were isolated from the methanol extract of the whole plant of Caralluma negevensis Zohary (Asclepiadaceae). The structures of the isolated compounds were established by different spectroscopic methods.
Keywords: Caralluma negevensis; Asclepiadaceae; Megastigmane glycosides; Flavone glycosides;
Biochemical characterization of blood orange, sweet orange, lemon, bergamot and bitter orange by Saı̈dani Moufida; Brahim Marzouk (1283-1289).
This paper reports on the composition of aroma compounds and fatty acids and some physico-chemical parameters (juice percentage, acidity and total sugars) in five varieties of citrus: blood orange, sweet orange, lemon, bergamot and bitter orange. Volatile compounds and methyl esters have been analyzed by gas chromatography. Limonene is the most abundant compound of monoterpene hydrocarbons for all of the examined juices. Eighteen fatty acids have been identified in the studied citrus juices, their quantification points out that unsaturated acids predominate over the saturated ones. Mean concentration of fatty acids varies from 311.8 mg/l in blood orange juice to 678 mg/l in bitter orange juice.Composition of aroma compounds and fatty acids and some physico-chemical parameters (juice percentage, acidity and total sugars) in five varieties of citrus, blood orange, sweet orange, lemon, bergamot and bitter orange have been studied.
Keywords: Blood orange; Sweet orange; Lemon; Bergamot; Bitter orange; Aroma; Fatty acids; Lipids;