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< prev - next > Food processing Dairy KnO 100186_Butter and Ghee (Printable PDF)
There are four types of butter that can be made from fresh or fermented milk, from cream, or
from the whey that remains after cheese making (Table 1). Butters are made by separating the
fat in milk. They contain more than 80% fat with a small amount of water dispersed through the
fat as tiny droplets, which are so small that the butter looks dry. Butters have a pale
yellow/cream colour, and a smooth consistency so that they spread easily and melt in the mouth.
They are used as spreads, for cooking, or as bakery ingredients. Heat is used to destroy food
poisoning bacteria and most spoilage bacteria. The heat also inactivates some of the enzymes in
the cream. Secondary preservation is due to the low moisture content, by keeping the butter cool
and packaging it so that it cannot become recontaminated by dirt, insects or micro-organisms.
This also slows the development of rancidity.
Ghee is a golden oil or fat (depending on the room temperature), made from cow’s or buffalo
milk. It has a high demand in some countries as domestic cooking oil and as an ingredient for
bakeries. It is made by heating cream to boil off the water and then filtering out the solidified
proteins. Ghee is preserved by a combination of heat, which destroys enzymes and contaminating
micro-organisms, and by removing water from the oil to prevent micro-organisms growing during
storage. It has a long shelf life if it is stored in a cool place, using airtight, lightproof and
moisture-proof containers to slow down the development of rancidity. Further details of the
principles of preservation are given in Technical Brief: Dairy Processing - an overview, which is
intended to be read alongside this Technical Brief.
Type of butter
Lactic (or ‘cultured’) butter Made from soured milk or cream, may be salted or unsalted.
Slightly acid taste
Fresh (or ‘sweet’) butter
Made from cream, may be salted or unsalted, mild creamy
A clear golden brown oil with a characteristic flavour of milk
fat, made by heating cream to remove the moisture and
filtering out the solids.
Whey butter
Made from whey separated from curd during cheese making.
It is strong tasting with a slight cheesy and slightly acidic
flavour. It can taste salty if salt is added to the cheese before
the whey is drained off. It is less shiny than fresh butter,
more oily, and with a deeper yellow colour.
Table 1: Types of butter (Adapted from Dairy Science and Technology Education).
Most butters contain about 16% water, and any contaminating micro-organisms are found in the
water droplets. When salted butter is made, the salt (1-2%) dissolves in the water droplets, so the
effective salt concentration is approximately 10% in the water. It acts as a preservative to improve
the shelf life by suppressing the growth of any micro-organisms that are present, and also
improves the flavour.
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