Food Industry. Машутина Е.А. - 21 стр.

       9 Text 8 New Generation of Yeast
       Through the years, the baker has had quality yeast available to him both in
compressed or wet form, and as an active dry yeast. A third type, instant active dry
yeast has now become available. This new generation of yeast is similar to
conventional active dry yeast in many ways. However, there are certain
characteristics of the instant yeast which represent new advances in yeast
technology. Instant yeast, like conventional dry yeast, has a long shelf life, is
tolerant to a fairly wide range of storage temperatures, is free-flowing, and
convenient to handle. It differs, however in that it possesses a higher level of
activity per unit weight of dry material, doesn’t require a separate stage for
rehydrating the yeast prior to use.
    These differences are the result of advanced technology in both yeast genetics
and processing. As an example, an improved drying process has enabled the
processing of high activity yeast with 50 to 55% protein content into a high
potency dried product.
    The rod-shaped yeast particles are dried on a fluid bed dryer which gives rapid
drying without exposing the yeast to high temperatures which would result in
damage to the cell membrane or reduction of enzymatic activity with the yeast cell.
       An open structure allows water to freely penetrate each granule, resulting in
instant rehydration of the yeast. This eliminates the need to first disperse and
activate the yeast in warm water before using.

       9.1 Words to remember

1   tolerant – устойчивый
2   rehydrating – восстановление влагосодержания
3   potency – сила, могущество
4   rod-shaped – в форме палочки
5   fluid bed – кипящий слой
6   to expose – подвергать воздействию
7   enzumatic - ферментативный

8 to eliminate – выделять, удалять, устранять
9 to disperse – устанавливать

       9.2 Find the meaning of the words and memorize them

1   instant yeast –
2   tolerant –
3   free-flawing –
4   dehydrate –
5   to enable –
6   rod-shaped –
                                                                                 25