The influence of additives on beer stability investigated by EPR spectroscopy

被引：26

作者：

Brezová, V ^{[1
]}

Polovka, M ^{[1
]}

Stasko, A ^{[1
]}

机构：

[1] Slovak Univ Technol Bratislava, Fac Chem Technol, Dept Chem Phys, SK-81237 Bratislava, Slovakia

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2002年 / 58卷 / 06期

关键词：

EPR spectroscopy; beer stability; additives; vitamin C; vitamin E; Na2SO3; indicators; PBN; TEMPOL;

D O I：

10.1016/S1386-1425(01)00717-X

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

In thermally-accelerated aging followed by EPR spectroscopy of beer samples of various stabilities, free radical 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPOL) was shown to be an effective indicator of the breakdown of a sample's stability, comparable to the commonly used spin trapping agent alpha-phenyl-N-tert-butylnitrone (PBN). Both indicators were then employed to investigate the influence of additives on beer stability. The addition of L-ascorbic acid (ASC) to the beer samples accelerated the radical processes and a lower stability was found. DL-alpha-tocopherol (alpha-TOC) did not influence beer stability significantly (probably due to its limited solubility). Na2SO3, described as a very effective stabilizer in experiments with the PBN spin trap, was found not to be effective using the TEMPOL indicator. This is probably due to inhibition in the formation of spin adducts or their degradation by Na2SO3. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：1279 / 1291

页数：13

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