Kasim Cemal Güven

Istanbul University, İstanbul, Istanbul, Turkey

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Publications (7)5.96 Total impact

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    Kasim Cemal Güven · Aline Percot · Ekrem Sezik
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    ABSTRACT: This paper presents the alkaloids found in green, brown and red marine algae. Algal chemistry has interested many researchers in order to develop new drugs, as algae include compounds with functional groups which are characteristic from this particular source. Among these compounds, alkaloids present special interest because of their pharmacological activities. Alkaloid chemistry has been widely studied in terrestrial plants, but the number of studies in algae is insignificant. In this review, a detailed account of macro algae alkaloids with their structure and pharmacological activities is presented. The alkaloids found in marine algae may be divided into three groups: 1. Phenylethylamine alkaloids, 2. Indole and halogenated indole alkaloids, 3. Other alkaloids.
    Marine Drugs 02/2010; 8(2):269-84. DOI:10.3390/md8020269 · 3.51 Impact Factor
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    ABSTRACT: Loliolide content was determined in 13 marine algae including red, brown and green algae collected from the Black Sea, the Dardanelles and the Aegean Sea. Identification and quantification were performed by gas chromatography-mass spectrometry. The loliolide content in green alga is 1.76 microg g(-1), ranges from 0.14 to 4.35 microg g(-1) in red and from 0.18 to 4.83 microg g(-1) in brown algae. The results obtained are in the same range as previously reported for algae, as well as terrestrial plants. This article represents the first report of loliolide occurrence in green algae.
    Natural product research 02/2009; 23(5):460-5. DOI:10.1080/14786410802076069 · 1.23 Impact Factor
  • Zeynep Aydoğmuş · Gülaçti Topcu · Kasim Cemal Güven
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    ABSTRACT: A new sterol glucoside, (24R)-5 alpha-stigmast-9-(11)-en-3beta-D-glucopyranoside (1) has been isolated from a methanol extract of the red alga Gracilaria verrucosa, while cholesterol and (Z)-9-hexadecenoic acid (palmitoleic acid) have been isolated from a dichloromethane-acetone extract of the same alga. Additionally, an oily fraction of a dichloromethane-acetone extract has been investigated by gas chromatography/mass spectrometry (GC/MS). The main components in the oily fraction were heneicosanoic acid (49.8%), (Z)-9-octadecenoic acid (15.8%), and 15-tetracosenoic acid (15.6%) in addition to a few hydrocarbons, simple aromatics and a new compound, namely 3,4-dimethyl-5-carboxyclic acid-1-oxacyclopent-3-en-2-one. The structures of the isolated compounds have been elucidated by spectroscopic methods.
    Natural product research 01/2009; 22(18):1589-96. DOI:10.1080/14786410701838130 · 1.23 Impact Factor
  • Kasim Cemal Güven · Filiz Nesimigil
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    ABSTRACT: In this work the influence of oil amount in sediment was determined using various reference oils by UVF. 15 reference oils which were transported from the Black Sea used for plotting of standard curve. The differences of oil amount found through reference oil equations were varied in sediment as 17.0-28.1 % in wet weight, 13.4-14.1 % in oven, 12.2-26.2 in freeze dryer. These results showed that reference oils have an important role on the amount of oil in sediment. In the determination of oil pollution, the pollutant oil must be used in the analysis as references for each time.
  • Serap Sağlik Aslan · Selin Cumali · Kasim Cemal Güven
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    ABSTRACT: Beroe ovata was collected from Kumkapi, İstanbul, Sea of Marmara. Fatty acids composition of Beroe ovata were determined using GC/MS. Total lipid amount was found as 0.98±0.05 mg/g (n=6). Total saturated; monounsaturated and polyunsaturated fatty acids percentages were 35.78, 14.11 and 37.09, respectively. Eicosapentaenoic acid (EPA, 20:5n-3) percentage was 9.75 and docosahexaenoic acid (DHA, 22:6n-3) percentage was 23.01. Docosapentaenoic acid was not detected in Beroe ovata. EPA/DHA ratio was found as 0.42. The difference of fatty acids between the Beroe ovata with Beroe cucumis and Beroe forskalii were detection of 21:0 ve 17:1n-7 in only Beroe ovata
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    ABSTRACT: In this work the oil and detergent pollutions were investigated in sea water, near the refinery of TUPRAŞ and Ali Ağa, Istanbul Strait, Golden Horn and Çanakkale Strait. The pollutions were higher in refinery areas. The results inadequate that there is apparently no regular seasonal variation in oil and detergent amount. The
  • Selin Cumali · Kasim Cemal Güven