By Mellor J.W.

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Additional resources for A comprehensive treatise on inorganic and theoretical chemistry. F, Cl, Br, I, i, Na, K, Rb, Cs

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Spring grown crops were again dominated by Chariot and the increasingly popular Optic, the latter being seemingly set to become the predominate spring variety. 1 also indicates the percentage of each variety that has attained malting grade and the projected demand by the brewing industry. 1 UK malting barley availability - 1998 harvest estimate - preharvestt Variety Likely production (tonnes) Halcyon Pipkin Maris Otter Puffin Fanfare Gleam Regina Spice Melanie Other winter Total winter 300 000 110000 30 000 50 000 450 000 400 000 800 000 15 000 250 000 2 395 000 4800000 60 50 75 30 45 50 40 75 20 2 180 000 55 000 22 500 15 000 202 500 200 000 320 000 11 250 50 000 47 900 1104150 220 000 100 000 22 500 55 000 170000 100000 I 00 000 11 250 50 000 25 000 853 700 Chariot Optic Alexis Prisma Cooper Other spring Total spring 750 000 550 000 60 000 200 000 90 000 350 000 2000000 50 50 75 45 50 30 375 000 275 000 45 000 90 000 45 000 105 000 935 000 450 000 275 000 50 000 150 000 45 000 120000 1090000 Grand total 6 800 000 2 039 150 1 943 700 O/o Suitable for malting Tonnes available for malting Demand (tonnes) Courtesy of the International Brewers’ Guild.

14 The grains showing the first signs of germination in the form of a slight ‘chit’ are then transferred to the germination area. Traditionally, germination would be carried out on floors, with a bed grain depth of about 20 cm. As germination proceeds metabolic heat is produced and this is dissipated by regular (twice per day) 23 Malting raking of the beds with shovels. Raking also prevents matting of the rootlets and carbon dioxide build-up. Ambient temperature should not rise above 19 “C during germination.

The malting process produces far more sugars, both in terms of variety and volume. (2) Gums. These are the P-glucans and pentosans which are soluble in hot water. (3) Hemicelluloses. This fraction refers to the P-glucan and pentosan component that is insoluble in hot water. P-Glucan is a linear polymer of P(1-+4) (70%) and P(1+3) (30%) linked glucose units. Most of it is to be found in the endosperm cell walls, although a small amount emanates from the husk. Pentosans are, technically, arabino-xylans since they consist of a backbone chain of p(1-4) linked xylose units which bear side-chains of p( 1-3) linked arabinose units.

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