|
Pollach, G.:
Enzymatic determination of the total fermentable sugars in sugar factory products (German).
Zuckerindustrie 107 (1982) pp. 603-606.
|
|
Abstract: An enzymatic method for determination of the total fermentable sugars in the absence of melibiase is described. The results of the method are relevant to utilization of sugar factory products by Saccharomyces cerevisiae. In principle, the sum of glucose and fructose, after hydrolysis of the oligosaccharides, is determined by means of β-fructosidase. The aim of the work is to obtain, by modifying the well-known hexokinase method, a reproducibility that is adequate for the determination of major sample components.
|
|
Pollach, G.; Wieninger, L.; Berninger, H.:
Comparison of different methods for determination of the dry solids content of sugar syrups
of varying purity (German).
Zuckerindustrie 105 (1980) pp. 451-456.
|
|
Abstract: Comparative tests were conducted on different methods of dry solids in beet molasses. In comparison between drying methods and moisture determination by the Karl Fischer method, mean deviations were found of up to 0.63 rel. % with filter paper used as absorbent in drying; this corresponds to about half the difference between the Karl Fischer method and the vacuum/sand method. Reproducibility of the filter paper method could be some three times better than that of the vacuum/sand method. Refractometric measurements show a relatively constant deviation from results of the filter paper method used as reference values, whereas with densimetric dry solids determination random fluctuations occurred in the deviations. A relation for calculation of "true" dry solids values from refractometric measurements and polarization is presented which is valid for Quentin molasses. |
Short reversible equation to calculate density from dry substance (d.s.), valid for the range of 0-60 %:
d.s.[%] = 140.74652 * ln (density - 0.45598) + 86.14454
density = exp ((d.s. - 86.14454) / 140.74652) + 0.45598
|
|
Rösner, G.; Pollach, G.:
Automated method for the determination of hardness in thin juices.
Zuckerindustrie 126 (2001) pp. 890-897.
|
|
Abstract: A new method for an automated determination of hardness (calcium ions) in sugar factory juices was developed, based on a combination of the Clark method with a foam probe. Some uncertainties of the original method are eliminated through a well-defined foam generation by means of aeration and a precise course of a program. A cleaning step as a part of the cycle ensures a high reliability of the procedure. During the 2000 campaign, two prototypes worked without any trouble in two sugar factories over several months. Maintenance is confined to manually cleaning a gas distribution tube once a week, hence the equipment has low service requirement. Reagents of technical purity can be used, thus giving low running costs. Systematic errors of the Clark method as well as varying colors of juices have only slight influence on the results of the automated method.
|
|
Hein, W.; Pollach, G.:
Semi-automatic determination of marc in sugar beet and pressed pulp (German).
Zuckerindustrie 112 (1987) pp. 204-207. |
| Abstract: The application of a semi-automatic method to determinate the marc content in beet and pressed pulp is reported. Proceeding from a method for fibre determination in sweet sorghum, suitable extraction conditions are given for beet material, with particular reference to sample preparation by drying and crushing. Possible applications of the method, chiefly in connection with a drying technique, are also indicated.
|
|
Pollach, G.; Hein, W.; Rösner, G.; Berninger H.:
Experiences with new analytical methods for the sugar industry (German).
Zuckerindustrie 111 (1986) pp. 1101-1107. |
| Abstract: New analytical techniques are described which could be of significance for the sugar industry. First it is shown how a balance at the beet end of sugar factories can be calculated from examination of dried samples of beet, pressed pulp and carbonatation mud. Then a polarimetric method is reported which relies only on weighing and thus can easily be automated. Finally, it is demonstrated how enzymatic determination of L- and D-lactic acid in molasses can provide clues to the microbiological processes in diffusers.
|
|
Hein, W.; Pollach G.:
Analytical methods for control of sweet sorghum processing - juice extraction sector (German).
Zuckerindustrie 110 (1985) pp. 291-296. |
| Abstract: Methods are reported for the determination of dry solids, fibre, sugar and starch in sweet sorghum and sweet sorghum bagasse which have been successfully applied to monitoring of pilot trials with sweet sorghum. These consisted partly of adapted methods suited to the sorghum material and partly of new methods devised. In addition, details are given of sampling or sample preparation and of the reproducibility of the individual determinations.
|
|
Pollach, G.; Berninger, H.:
Testing the currently valid ash coefficient for determination of conductivity ash in white sugar
by determination of the alkali and alkaline earth components using atomic absorption (German).
Zuckerindustrie 105 (1980) pp. 992-994. |
| Abstract: Results of comparative tests on determination of the ash content of white sugar samples by conductivity measurement and atomic absorption spectroscopy are reported. For the latter method a process with matrix compensation with a mixed bed ion exchanger was used. This matrix compensation was also applicable for determination of volatile elements (Pb, Cd) in white sugar by graphite furnace techniques.
|
|
