Convertibility of IoB, EBC and SABS Methods for Sorghum DP Measurements Using Correlation Coefficients
Okokon U EtokAkpan 1,2
1 Department of Brewing Science & Technology, PMB 1017, Uyo, Akwa Ibom State.
2 Corresponding author. E-mail: oetokakpan@yahoo.com
J. Inst. Brew. 110(4), 335-339, 2004 | VIEW ARTICLE
ABSTRACT
The convertibility of the methods for Sorghum malt DP measurement using the correlation coefficient (I) was studied using malts of the white sorghum variety (farafara) from malting outlets, which had been steeped for one day and germinated for four days at 30°C. A correlation of 0.97 (p < 0.00001) was obtained between the IoB (Institute of Brewing) and EBC (European Brewing Convention) methods while the correlation dropped to 0.95 (p < 0.001) between the SABS (South African Bureau of Standards) and IoB and 0.94 (p < 0.34) between SABS and EBC methods. The study was extended to include eleven pure varieties (KSV, ICSV and ICSH entries), which had been steeped for one and a half days and germinated for six days at 25°C. A correlation of 0.968 (p < 0.000004) was obtained between the IoB and EBC methods of DP assay. The correlation dropped to 0.90 (p < 0.0002) between SABS and IoB and 0.91 (p < 0.007) between SABS and EBC assay methods. The IoB and EBC methods are considered suitable for sorghum DP measurements as a way of having the DP in one unit when sorghum and barley malts are used in one mash.
Key words:
DP, °L, °WK, SDU, sorghum.
Publication no. G-2004-1229-210 ©2004 The Institute & Guild of Brewing