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  • 1
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    Analysis of anka pigments by liquid chromatography with diode array detection and tandem mass spectrometry (1998)
    Springer
    Details
    Publication Date: 1998-05-01
    Print ISSN: 0009-5893
    Electronic ISSN: 1612-1112
    Topics: Chemistry and Pharmacology
    Published by Springer
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  • 2
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    Zum papierchromatographischen Verhalten einiger Abbauprodukte des Vitamins C (1958)
    Springer
    Details
    Publication Date: 1958-05-01
    Print ISSN: 0016-1152
    Topics: Chemistry and Pharmacology
    Published by Springer
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  • 3
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    Studies on the tocopherol status in blood serum of premature babies and infants (1986)
    Springer
    Details
    Publication Date: 1986-03-01
    Print ISSN: 0044-264X
    Electronic ISSN: 1435-1293
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Published by Springer
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  • 4
    Electronic Resource
    Electronic Resource
    The fermentation of rice for anka pigment production (2000)
    Springer
    Journal of industrial microbiology and biotechnology 25 (2000), S. 141-146 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: solid state fermentation; Monascus purpureus; anka pigments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Optimal physical parameters of the solid state fermentation of rice to produce anka pigments and their influences on pigment production were studied. Anka pigment production, especially that of two orange anka pigments (rubropunctatin and monascorubrin), was highly sensitive to the moisture content of the rice substrate. Optimal initial moisture content of rice substrate was 24%. Pigment formation was retarded when extra water was added to the inoculated substrate during cultivation. High filling amount of rice substrate in a flask was unfavorable for pigment production. Loosening of the inoculated substrate once a day enhanced pigment production. With a high carbon dioxide level in the incubator, no orange pigments were detected. Freeze drying the fermented material produced a superior yield of anka pigments, while oven drying at 50°C for 24 h was a reasonable alternative. Journal of Industrial Microbiology & Biotechnology (2000) 25, 141–146.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.7000044
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  • 5
    Electronic Resource
    Electronic Resource
    Studies on the tocopherol status in blood serum of premature babies and infants (1986)
    Springer
    European journal of nutrition 25 (1986), S. 1-8 
    Details
    ISSN: 1436-6215
    Keywords: Vitamin E ; tocopherol ; premature infant ; HPLC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Bei 88 Frühgeborenen im Alter von 0 bis 2 Jahren wurde der Gehalt an natürlich vorkommendem Tocopherol im Blutserum durch Hochleistungsflüssigkeitschromatographie (HPLC) mit fluorimetrischer Detektion bestimmt. In 11 Fällen wurde während eines längeren Zeitraums der Tocopherolstatus von Patienten, die bekannte Vitamin-E-Präparate oral und/oder parenteral aufnahmen, untersucht. Es wurde keine Korrelation zwischen alpha-Tocopherol-Spiegel und Gestationsalter bzw. Geburtsgewicht beobachtet. Alle Frühgeborenen, die Vitamin-E-Präparate erhielten, wiesen im Durchschnitt Serum-Tocopherolgehalte von mehr als 0,5 mg/100 ml auf. Die höchste alpha-Tocopherolkonzentration, die während einer Vitamin-E-Therapie gemessen wurde, war 3,28 mg/100 ml. Eine Infusion von Intralipid, einem Produkt, das aus fraktioniertem Sojaöl erhalten wird, verursachte einen signifikanten Anstieg der gamma- und delta-Tocopherolgehalte im Blutserum. Für die Halbwertszeit von delta-Tocopherol im Serum wurde ein Wert von etwa 24 Stunden berechnet.
    Notes: Summary The level of naturally occurring tocopherols in blood serum of 88 preterm infants, aged from birth to 2 years, was determined by the high performance liquid chromatographic (HPLC) method using fluorescence detection. In 11 cases, patients were assayed for their tocopherol status in longitudinal studies, receiving known amounts of vitamin E supplements orally and/or parenterally. No correlation was found between serum alpha-tocopherol level and gestational age nor birth weight. All preterm infants receiving the vitamin E preparation showed an average serum tocopherol content of more than 0.5 mg/100 ml. The highest alpha-tocopherol concentration registered during vitamin E therapy was 3.28 mg/100 ml. Infusion of Intralipid, a product derived from fractionated soybean oil, caused a significant increase of gamma- and delta-tocopherol in blood serum. The half-life of delta-tocopherol in serum was calculated to be about 24 hours.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02023615
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  • 6
    Electronic Resource
    Electronic Resource
    Analysis of anka pigments by liquid chromatography with diode array detection and tandem mass spectrometry (1998)
    Springer
    Chromatographia 47 (1998), S. 529-536 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Thin layer chromatography ; Mass spectrometry detection ; Anka pigments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Anka is withMonascus sp. fermented rice, which shows a purplish red color. On rice grainsMonascus purpureus DSM 1379 synthesized four anka pigments. Through extraction of anka with n-hexane and methanol in succession and through repeated crystallizations from absolute ethanol anka pigments were crystallized into two fractions: organge anka pigments (rubropunctatin and monascorubrin) and yellow anka pigments (monascin and ankaflavin). The treatment of two organge anka pigments with aqueous ammonia solution gave red nitrogen analogues (rubropunctatamine and monascorubramine). The above six pigments were separated into each pigment by two dimensional thin layer chromatography (TLC) or high performance liquid chromatography (HPLC). HPLC-atmospheric pressure chemical ionization-tandem mass spectrometry (HPLC-APCI-MS-MS) and direct probe mass spectrometry (MS) were used to identify these pigments. HPLC-diode array detector (HPLC-DAD) was used to determine UV-VIS spectra of pigments. Pigments were analyzed with HPLC under the following conditions: C18 column, acetonitrile/water (80∶20, v/v), 0.5 mL min−1, 233 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02467490
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  • 7
    Electronic Resource
    Electronic Resource
    Zum papierchromatographischen Verhalten einiger Abbauprodukte des Vitamins C (1958)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 162 (1958), S. 193-197 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Die Abbauprodukte des Vitamins C, die 2,3-Diketo-L-gulonsäure und dis L-Threonsäure, wurden hergestellt und ihre Lösungen papierchromatographisch charakterisiert. Der in Chromatogrammen von Ascorbinsäure enthaltendem Material häufig auftretende Fleck mit dem Rf-Wert 0,11–0,14 ist als der 2,3-Diketo-L-gulonsäure zugehörig erkannt worden. Der Rf-Wert der als Vergleichssubstanz herangezogenen 2-Keto-L-gulonsäure beträgt 0,14–0,16, der ihrer Alkalisalze 0,10–0,12.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00456883
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