Difference between revisions of "Sugar (raw and refined)"
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Sugarcane (Saccharum spp.) is cultivated in tropical and sub-tropical regions for the sucrose that is found in its stems. It requires a frost-free climate with sufficient rainfall during the growing season to make full use of the plant's great growth potential. The crop is harvested mechanically or by hand, chopped into lengths and conveyed rapidly to the processing plant. Here it is either milled and the juice extracted with water or the sugar is extracted by diffusion. The juice is then clarified with lime and heated to kill enzymes. The resulting thin syrup is then concentrated in a series of evaporators and then further water is removed by evaporation in vacuum containers. The resulting supersaturated solution is seeded with sugar crystals and the sugar crystallizes out and is separated from the fluid and dried. [[Molasses]] is a by-product of the process and the fibre from the stems, known as bagasse, is burned to provide energy for the boiling of the syrup. The crystals of raw sugar have a sticky brown coating and can either be used as they are or can be bleached by [[sulphur]] dioxide or treated in a carbonation process to produce a whiter product.<br><br> | Sugarcane (Saccharum spp.) is cultivated in tropical and sub-tropical regions for the sucrose that is found in its stems. It requires a frost-free climate with sufficient rainfall during the growing season to make full use of the plant's great growth potential. The crop is harvested mechanically or by hand, chopped into lengths and conveyed rapidly to the processing plant. Here it is either milled and the juice extracted with water or the sugar is extracted by diffusion. The juice is then clarified with lime and heated to kill enzymes. The resulting thin syrup is then concentrated in a series of evaporators and then further water is removed by evaporation in vacuum containers. The resulting supersaturated solution is seeded with sugar crystals and the sugar crystallizes out and is separated from the fluid and dried. [[Molasses]] is a by-product of the process and the fibre from the stems, known as bagasse, is burned to provide energy for the boiling of the syrup. The crystals of raw sugar have a sticky brown coating and can either be used as they are or can be bleached by [[sulphur]] dioxide or treated in a carbonation process to produce a whiter product.<br><br> | ||
Sugar beet (Beta vulgaris) is a tuberous root which contains a high proportion of sucrose. It is cultivated in temperate regions with adequate rainfall and requires a fertile soil. The crop is harvested mechanically in the autumn and the crown of leaves and excess soil removed. The [[roots]] do not deteriorate rapidly and may be left in a clamp in the field for some weeks before being transported to the processing plant. Here the crop is washed and sliced and the sugar extracted by diffusion. The raw juice is then treated with lime and carbonated in a number of stages in order to purify it. Water is evaporated by boiling the syrup under a vacuum. The syrup is then cooled and seeded with sugar crystals. The white sugar which crystallizes out can be separated in a centrifuge and dried. It requires no further refining.<br><br> | Sugar beet (Beta vulgaris) is a tuberous root which contains a high proportion of sucrose. It is cultivated in temperate regions with adequate rainfall and requires a fertile soil. The crop is harvested mechanically in the autumn and the crown of leaves and excess soil removed. The [[roots]] do not deteriorate rapidly and may be left in a clamp in the field for some weeks before being transported to the processing plant. Here the crop is washed and sliced and the sugar extracted by diffusion. The raw juice is then treated with lime and carbonated in a number of stages in order to purify it. Water is evaporated by boiling the syrup under a vacuum. The syrup is then cooled and seeded with sugar crystals. The white sugar which crystallizes out can be separated in a centrifuge and dried. It requires no further refining.<br><br> | ||
| + | ==Applications== | ||
| + | <b>Granulated sugars</b><br> | ||
| + | Granulated suguars are used at the table to sprinkle on foods and to sweeten hot drinks and in home baking to add sweetness and texture to cooked products. They are also used as a preservative to prevent micro-organisms growing and perishable food from spoiling as in [[jams]], marmalades and candied fruits.<br><br> | ||
| + | <b>Milled sugars</b><br> | ||
| + | Milled sugars are ground to a fine powder. They are used as icing sugar, for dusting foods and in baking and confectionery.<br><br> | ||
| + | <b>Screened sugars</b><br> | ||
| + | Screened sugars are crystalline products separated according to the size of the grains. They are used for decorative table sugars, for blending in dry mixes and in baking and confectionery.<br><br> | ||
| + | <b>Brown sugars</b><br> | ||
| + | Brown sugars are granulated sugars with the grains coated in molasses to produce a light, dark or demerara sugar. They are used in baked goods, confectionery and toffees.<br><br> | ||
| + | <b>Sugar cubes</b><br> | ||
| + | Sugar cubes are white or brown granulated sugars pressed together in block shape. They are used to sweeten drinks.<br><br> | ||
| + | <b>Liquid sugars</b><br> | ||
| + | Liquid sugars are strong syrups consisting of 67% granulated sugar dissolved in water. They are used in the food processing of a wide range of products including beverages, ice cream and jams.<br><br> | ||
| + | <b>Invert sugars</b><br> | ||
| + | Invert sugars and syrups are blended to manufacturers specifications and are used in breads, cakes and beverages for adjusting sweetness, aiding moisture retention and avoiding crystallization of sugars.<br><br> | ||
| + | <b>Syrups and treacles</b><br> | ||
| + | Syrups and treacles are dissolved invert sugars heated to develop the characteristic flavours. Treacles have added molasses. They are used in a range of baked goods and confectionery including toffees and [[licorice]].<br><br> | ||
| + | <b>Low calorie sugars and sweeteners</b><br> | ||
| + | Low calorie sugars and sweeteners are often made of maltodextrin with added sweeteners. Maltodextrin is an easily digestible synthetic polysaccharide consisting of short chains of glucose molecules and is made by the partial hydrolysis of starch. The added sweeteners are often aspartame, saccharin, stevia or sucralose.<br><br> | ||
| + | <b>Polyols</b><br> | ||
| + | Polyols are sugar alcohols and are used in chewing [[gums]] where a sweet flavor is required that lasts for a prolonged time in the mouth.br><br> | ||
| + | <b>Raw sugar</b><br> | ||
| + | Raw sugar is used not only to produce consumer sugar but also without further industrial processing in breweries, the industry and as a feedstuff. | ||
Revision as of 10:55, 4 July 2012
| Infobox on Sugar (raw and refined) | |
|---|---|
| Example of Sugar (raw and refined) |  |
| Facts | |
| Origin | This table shows only a selection of the most important countries of origin and should not be thought of as exhaustive:
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| Stowage factor (in m3/t) |
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| Angle of repose |
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| Humidity / moisture |
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| Oil content | - |
| Ventilation | - |
| Risk factors | Unextinguished cigarette ends may cause sugar fires, which are greatly feared because they are difficult to extinguish. Ash acts as a catalyst in combustion. Sugar fires are extinguished with CO2 or chemical extinguishing agents. Raw sugar is highly sensitive to any foreign odors and should thus not be stored together with odor-emitting products. Raw sugar is sensitive to dust, dirt, fats and oils. When exposed to moisture, raw sugar has a tendency to grow mold and form syrup. It may also suffer depreciation as the result of infestation by rats, mice, ants, flies and silverfish. |
Sugar (raw and refined)
Description
Sugar is the generalised name for a class of sweet-flavored substances used as food. They are carbohydrates and as this name implies, are composed of carbon, hydrogen and oxygen. There are various types of sugar derived from different sources. Simple sugars are called monosaccharides and include glucose, fructose and galactose. The table or granulated sugar most customarily used as food is sucrose, a disaccharide. Other disaccharides include maltose and lactose.
Sugars are found in the tissues of most plants but are only present in sufficient concentrations for efficient extraction in sugarcane and sugar beet. Sugarcane is a giant grass and has been cultivated in tropical climates in the Far East since ancient times. A great expansion in its production took place in the 18th century with the setting up of sugar plantations in the West Indies and Americas. This was the first time that sugar became available to the common people who had previously had to rely on honey to sweeten foods. Sugar beet is a root crop and is cultivated in cooler climates and became a major source of sugar in the 19th century when methods for extracting the sugar became available.
Sugarcane (Saccharum spp.) is cultivated in tropical and sub-tropical regions for the sucrose that is found in its stems. It requires a frost-free climate with sufficient rainfall during the growing season to make full use of the plant's great growth potential. The crop is harvested mechanically or by hand, chopped into lengths and conveyed rapidly to the processing plant. Here it is either milled and the juice extracted with water or the sugar is extracted by diffusion. The juice is then clarified with lime and heated to kill enzymes. The resulting thin syrup is then concentrated in a series of evaporators and then further water is removed by evaporation in vacuum containers. The resulting supersaturated solution is seeded with sugar crystals and the sugar crystallizes out and is separated from the fluid and dried. Molasses is a by-product of the process and the fibre from the stems, known as bagasse, is burned to provide energy for the boiling of the syrup. The crystals of raw sugar have a sticky brown coating and can either be used as they are or can be bleached by sulphur dioxide or treated in a carbonation process to produce a whiter product.
Sugar beet (Beta vulgaris) is a tuberous root which contains a high proportion of sucrose. It is cultivated in temperate regions with adequate rainfall and requires a fertile soil. The crop is harvested mechanically in the autumn and the crown of leaves and excess soil removed. The roots do not deteriorate rapidly and may be left in a clamp in the field for some weeks before being transported to the processing plant. Here the crop is washed and sliced and the sugar extracted by diffusion. The raw juice is then treated with lime and carbonated in a number of stages in order to purify it. Water is evaporated by boiling the syrup under a vacuum. The syrup is then cooled and seeded with sugar crystals. The white sugar which crystallizes out can be separated in a centrifuge and dried. It requires no further refining.
Applications
Granulated sugars
Granulated suguars are used at the table to sprinkle on foods and to sweeten hot drinks and in home baking to add sweetness and texture to cooked products. They are also used as a preservative to prevent micro-organisms growing and perishable food from spoiling as in jams, marmalades and candied fruits.
Milled sugars
Milled sugars are ground to a fine powder. They are used as icing sugar, for dusting foods and in baking and confectionery.
Screened sugars
Screened sugars are crystalline products separated according to the size of the grains. They are used for decorative table sugars, for blending in dry mixes and in baking and confectionery.
Brown sugars
Brown sugars are granulated sugars with the grains coated in molasses to produce a light, dark or demerara sugar. They are used in baked goods, confectionery and toffees.
Sugar cubes
Sugar cubes are white or brown granulated sugars pressed together in block shape. They are used to sweeten drinks.
Liquid sugars
Liquid sugars are strong syrups consisting of 67% granulated sugar dissolved in water. They are used in the food processing of a wide range of products including beverages, ice cream and jams.
Invert sugars
Invert sugars and syrups are blended to manufacturers specifications and are used in breads, cakes and beverages for adjusting sweetness, aiding moisture retention and avoiding crystallization of sugars.
Syrups and treacles
Syrups and treacles are dissolved invert sugars heated to develop the characteristic flavours. Treacles have added molasses. They are used in a range of baked goods and confectionery including toffees and licorice.
Low calorie sugars and sweeteners
Low calorie sugars and sweeteners are often made of maltodextrin with added sweeteners. Maltodextrin is an easily digestible synthetic polysaccharide consisting of short chains of glucose molecules and is made by the partial hydrolysis of starch. The added sweeteners are often aspartame, saccharin, stevia or sucralose.
Polyols
Polyols are sugar alcohols and are used in chewing gums where a sweet flavor is required that lasts for a prolonged time in the mouth.br>
Raw sugar
Raw sugar is used not only to produce consumer sugar but also without further industrial processing in breweries, the industry and as a feedstuff.