Starch and Liquid glucose from potato

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Starch and Liquid glucose from potato

Introduction

• Potato is rich in starch with 14-16% starch content. Although potato starch

is costlier when compared to maize and cassava, because of its superior

properties it is preferred for special applications in pharmaceutical, textile,

food and paper industries. The demand for potato starch is because of its

unique properties (Talburt and Smith, 1987). • The advantage of using potatoes for starch production is that substandard

potatoes not suitable for table or processing can be used for starch

production. Glucose syrup is a food syrup, made from the  hydrolysis

of starch. • Maize is commonly used as the source of the starch and the syrup in this

case is called "corn syrup", but glucose syrup is also made from other starch

crops, including potatoes , wheat, barley, rice and cassava.

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Starch and Liquid glucose from potato

Chemical composition of

starch

Potato Starch

Potato starch is superior to cereal starches in many ways. It has large granule size (5-100um), its lipid content is low, it has higher water binding capacity and high solubility, besides having low protein content and it helps in avoiding foam building and colour formation. It also has higher phosphorus content and higher swelling volume.

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Take 1kg big size potatoes Peel it

Cut into small pieces

Dip in water after putting 1% potass. metabisulphite

Grind in a grinder

Sieve it in a tub through muslin cloth with the help of waterLet the starch settle on the surface of tub

Decant the starch 2-3 times with water till the water is clear

Dry it in oven at 80C/ sunlight on tray till fully dryGrind till fine powder is obtained. Sieve it to get fine powder

About 50 to 100g of potato starch will be formed which can be stored in airtight containers for future use.

Method for preparation of potato starch

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Uses of Potato Starch

Potato starch may be utilized in several industries. In food industry it may be used as thickener in sauces, gravy, puddings, soups, etc. As softening agents in cakes, breads, biscuits and cookies. As ingredient in custard, cream, candies and chewing gums. In textile industry. it gives the finished cloth a smooth surface and better feels and hence is preferred in warp sizing. In paper industry it is useful in coating smooth white paper because of its unusually strong binding power for white pigments and clays. In pharmaceutical industry it is used for preparation of dextrins, adhesives, glues, drugs, dressing materials, binder for tablets, etc.

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Liquid glucose is a solution of glucose suspended in liquid and sold in jars or tubs. Many companies manufacture glucose in powdered form to which water can be added to make liquid glucose, to make transportation of this product easier. Liquid glucose is available from a variety of sources, depending on how one intends to use it. This monosaccharide is produced through the processing of starches such as corn, wheat and even potato.

Liquid Glucose

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Cont…….

Liquid glucose is an extremely pure form of glucose which has a concentrated flavor. In cooking, liquid glucose is used as a sweetener in a range of foods. This product does not crystallize, sweetens evenly, helps to preserve food, and has a very low freezing point, making it appealing for things like candy and ice cream. European recipes tend to call for liquid glucose more commonly, and it is more readily available in European stores for this reason. In medicine, liquid glucose is used when a patient has dangerously low blood sugar.

Liquid Glucose

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Cont…….

Potato starch is a fine, tasteless powder with excellent mouth-feel and provides higher viscosity than wheat and maize starches, and delivers a tastier product. It is used as a thickener for sauces and stews, and as a binding agent in cake mixes, dough, biscuits and ice-cream.  

Let Us Sum UP

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