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Changes in Biogenic Amine Content of Tokaj Grapes, Wines, and Aszu-wines (2000)

Hajós, G. ; Sass-kiss, A. ; Szerdahelyi, E. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Journal of food science 65 (2000), S. 0

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ISSN: 1750-3841

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology

Notes: : Biogenic amines in grapes, aszu-grapes, wines, and aszu-wines of the Tokaj region of Hungary were separated, identified, and quantified by HPLC. The biogenic amine content of the Tokaj wines was well below the suggested limits for any of the biogenic amines. Histamine contents were especially low in all the samples investigated. The composition and concentration of the biogenic amines (polyamines) in the grape berries were altered remarkably by the Botrytis cinerea, and this resulted in a great change of the amine concentration in the aszu-wines compared to the wines. The composition and concentration of biogenic amines might provide useful information on the vintage and can support the authentication of the Tokaj aszu-wines.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1365-2621.2000.tb10254.x

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Operation characteristics of the Au-II 690-nm laser transition in a segmented hollow-cathode discharge (2000)

Bánó, G. ; Szalai, L. ; Kutasi, K. ; [et al.]

Springer

Applied physics 70 (2000), S. 521-525

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ISSN: 1432-0649

Keywords: PACS: 42.55.Lt; 42.60.Lh; 52.80.-s

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract. Single-mode operation at the Au-II 690-nm transition was obtained in a segmented hollow-cathode discharge laser without the use of any additional frequency-selective device. The pressure of the helium buffer gas, which is responsible for the significant homogeneous broadening of the laser line, was varied between 10 and 20 mbar. The discharge was excited with rectangular current pulses (up to 3 A) six times exceeding the threshold value. The time dependence of the laser output during the 1-ms-long discharge pulses is explained on the basis of the temperature and pressure changes in the tube. The highest small-signal gain at optimal discharge conditions was 11%m−1.