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Xanthan gum: It is a polysaccharide that is produced by fermentation of carbohydrates by a gram-negative bacterium (Xanthomonas campestris) and is a thickening and suspending agent used in pharmaceuticals and prepared foods. It is also called xanthan. Xanthan is a stabilizer produced by Xanthomonas compestris (Plate 671). Xanthan is not hydrolysed or degraded by humans.

Xanthones: It is a group of yellow pigments e.g. mangiferin in mango,

Xanthophyll: Yellow hydroxyl carotene derivative which is present in all green leaves together with chlorophyll and carotene. Xanthophyll is a pigment containing O2 derived from carotene (Plate 672).

Xerophilous: An organism which is thriving in or tolerant to a xeric environment is called xerophilous.

Yabby: It is one of the burrowing Australian crayfishes (Cherax destructor) that are used for food.

Yakitori: A bite-size marinated pieces of beef, seafood, or chicken on skewers is called yakitori.

Yam: It is edible starchy tuberous root of plants (genus Dioscorea of the family Dioscoreaceae) used as a staple food in tropical areas (Plate 676).

Yautia: It is one of the aroid plants (Xanthosoma sagittifolium) chiefly of tropical America with starchy edible shaggy brown tubers that are cooked and eaten like yams or potatoes (Plate 677).

Yearling mutton: Meat obtained from 12-20 month aged sheep. It is also called Earling mutton.

Yeast: Unicellular plant body, very minute in size containing cell wall, cytoplasm with one or more vacuoles and a single nucleus, cause alcoholic fermentation (Plate 678). Yeast usually has little or no mycelium, and reproduces by budding. It results in production of yellowish surface froth or sediment that occurs in saccharine liquids (fruit juices) in which it promotes alcoholic fermentation, consists largely of cells of a fungus (as the saccharomyces, Saccharomyces cerevisiae), and is used in the making of alcoholic liquors and as a leaven in baking.

Q₁₀value: The number of times a reaction rate change with a 10^oC change in temperature is called Q ₁₀value. If reaction rate doubles with 10^oC change in temperature, Q ₁₀= 2. It is also called temperature quotient.

Q-enzyme: It is a branching enzyme responsible for formation of 1-6 bonds in amylopectin.

QHV process: It stands for Quality Has Value Process.

QO₂ : It is a unit for measurement of respiration. Or It is the oxygen uptake in microlitres per milligram on dry weight per hour.

Quailing: In this practice the oranges are kept in the baskets in which they are harvested to allow the fruit to loose little moisture. It is done for a couple of hours before transport to packhouse. This practice would allow the fruit to lose a little moisture which is called quailing. This operation is done for oranges to prevent Oleocellosis.

Qualitative measurement: It is a subjective / objective measurement of the quality of the product for presence of certain compound. It gives the idea of the presence or absence of the particular compound. It deals with the nature of the substance and not its amount or quantity.

Quality: Quality is a measure of the degree of excellence or degree of acceptability by the consumer. The quality may also be defined in term of end use and may vary depending upon consumer’s perception and need. Or quality is the totality of features and characteristics of a product that bear on its ability to satisfy stated or implied needs. It is a term defined by the consumer, buyer, grader, or any other client based on subjective and objective measurements of the food product.

Moisture Content
 
Two maximum moisture levels are provided to meet different climatic conditions and marketing practices. Lower values in the first column are suggested for countries with tropical climates or when long-term (more than one crop year) storage is a normal commercial practice. The values in the second column are suggested for more moderate climates or when other short term storage is the normal commercial practice.

Xanthan gum: It is a polysaccharide that is produced by fermentation of carbohydrates by a gramnegative bacterium (Xanthomonas campestris) and is a thickening and suspending agent used in pharmaceuticals and prepared foods. It is also called xanthan. Xanthan is a stabilizer produced by Xanthomonascompestris(Plate 257). Xanthan is not hydrolysed or degraded by humans.

Yabby: It is one of the burrowing Australian crayfishes (Cherax destructor) that are used for food.

Yakitori: A bite-size marinated pieces of beef, seafood, or chicken on skewers is called yakitori.

Yam: It is edible starchy tuberous root of plants (genus Dioscorea of the family Dioscoreaceae) used as a staple food in tropical areas.

Yautia: It is one of the aroid plants (Xanthosoma sagittifolium) chiefly of tropical America with starchy edible shaggy brown tubers that are cooked and eaten like yams or potatoes.

Yearling mutton: Meat obtained from 12-20 month aged sheep. It is also called Earling mutton.

Yeast: Unicellular plant body, very minute in size containing cell wall, cytoplasm with one or more vacuoles and a single nucleus, cause alcoholic fermentation (Plate 258). Yeast usually has little or no mycelium, and reproduces by budding. It results in production of yellowish surface froth or sediment that occurs in saccharine liquids (fruit juices) in which it promotes alcoholic fermentation, consists largely of cells of a fungus (as the saccharomyces, Saccharomyces cerevisiae), and is used in the making of alcoholic liquors and as a leaven in baking.

a) A Key GDP Contributor: Dairy and Livestock sector form the backbone of agriculture with 28 per cent contribution in GDP and the progress in this sector is dependent on innovative measures to increase the value for farmers as well as customers.

b) Doubling Farmer’s Income : Doubling Farmer’s Income by 2022 can be achieved by improving crop and livestock productivity, efficiency to utilize resources, increased intensity of cultivation and diversification in high value cash crops, processing and value addition of food and animal products. This price realization can be assured through market reforms and efficient market linkages.

c) Unorganised sector – a challenge : The Indian dairy sector is still characterized by strong presence of unorganized sector. Apart from the Cooperative dairy sector, in the last few years there has been a considerable growth in Private Dairy sector and Milk Producers Organization like Maahi in Gujarat. If small dairy farmers are provided with sufficient ‘value addition’ training and support, they can increase their income considerably.

d) Value addition : Further, the milk processing plants can also go for value addition and innovation and in turn pay remunerative prices to milk producers.

Principles
The quality of foods can be defined as the ‘composite’ of those ‘characteristics’ that differentiate individual unit of a product and have significance in determining the degree of acceptability of that unit by the consumer. The overall quality refers to technological, physiological, chemical, microbiological, nutritional; and sensory parameters to achieve the wholesome food. Sensory quality attributes such as taste, colour, texture, flavour and overall quality of any food products were evaluated by 9- point Hedonic rating test is used for the purpose of evaluation. This test measures the consumer’s acceptability.

Principle
Jam: Jam is a product made by boiling the fruit pulp with a sufficient quantity of sugar to reasonable consistency, firm enough to hold fruit tissues in position. Apple, pear, sapota, apricot, carrot etc. are used for preparation of fruit jam. Jam contains 0.5-0.6 % acid and invert sugar should not be more than 40 %.
Total soluble solids (TSS)
The TSS value is defined as the amount of sugar and soluble minerals present in fruits and vegetables. A refractometer is based on the principle of total refraction. This is done by placing a few drops of distilled water on the prism in the specimen chamber of the back the cover. The distilled water reading should be zero. If it is not so, it should be set to zero with the scale correction knob. The specimen chamber is now cleaned with muslin cloth or tissue paper. For determining the TSS, a drop of sample (jam, juice and syrup, etc.) is placed on the prism and the percentage of dry substance in it read directly on scale in refractometer.

Principle
Jelly: Jelly is a semi-solid product prepared by boiling a clear, strained solution of pectin containing fruit extract, free from pulp, after the addition of sugar and acid. A perfect jelly should be transparent, well set, but not too stiff, and should have the original flavour of the fruit. It should be of attractive colour and keep its shape when removed from the mould. Pectin (0.5-1.0%), acid (0.5-0.75%), sugar (65%), and water are the four essential ingredients. Pectin test and determination of end-point of jelly formation are very important for the quality of the jelly. Some recipes for jelly making are given below:

Objective: Development of RTS beverage from seasonal fruits.
Material required
Fruit, juicer-mixer-grinder, preservatives, sugar, refractometer, pan and knife etc.
Principle
Ready To Serve(RTS): This a type of fruit beverage which contain at least 10% fruit juice and 10% total soluble solid besides about 0.3% acid. This is not diluted before serving.
Before undertaking the preparation of beverage, it is necessary to know techniques of extraction of pulp/juice from various fruits used for RTS.

Principle
Squash: A fruit juice squash essentially consists of juice containing moderate quantity of fruit pulp to which cane sugar is added for sweetening e.g. orange squash, plum squash. This is a type of fruit beverage containing at least 25 percent fruit juice/pulp and 40-50 percent total soluble solids, commercially. It also contains about 1.0 percent acid and 350 ppm SO2 or 600 ppm sodium benzoate. It is diluted before serving.
Mango, orange and pineapple are used for making squash commercially. It can also be prepared from lemon, lime, guava, pear, apricot, muskmelon, papaya etc., using potassium metabisulphate (KMS) as preservative, or from jamun, passion fruit, peach, phalsa, mulberry, raspberry, straw berry, grapefruit etc., with sodium benzoate as preservative.

Principle
Nectar: The term ‘fruit nectar’ is used to designate pulpy fruit juice blended with sugar syrup and citric acid to produce a ready-to-drink beverage. In this fruit beverage contains at least 20% juice/pulp and 15% total soluble solid and also 0.3% acid. It is not diluted before serving. Many fruit juices are either too acidic or strongly flavoured; these cannot be pleasant without dilution of blending or both. These strong, tart juices are delicious after dilution with thin syrup or blend juice e.g. apricot, guava and plum juice. Out of the tropical fruits, nectars made from banana, guava, mango and papaya are quite popular. The product is sealed in container or glass bottles and processed by heat to prevent spoilage. The fruit ingredients may be puree, pulp, juice or concentrated equivalent to 40 percent of the finished products. Apples, cherries and pineapples are used in combination with others fruits. The sweeteners are sugar, invert sugar syrup, dried corn syrup, glucose syrup and the optional ingredients are lemon juice, citric, malic and fumaric acids as acidifier and ascorbic acid as antioxidants (150 ppm) can be used.

Principle
Chutney and sauces are important food products prepared both in homes as well as commercially in India. They improve the digestion and are good appetizers. Tomatoes are a good source of vitamin C. Fresh tomatoes are very refreshing and appetizing but can not be stored for a long period. Often they are sold at distress prices during the peak harvest season and nearly 25% of the produce is spoiled due to mishandling and improper processing facilities. Such losses can be reduced by converting fresh tomatoes in to delicious product like paste, puree, juice, ketchup/sauce and powder. Generally, the sugar content in ketchup/sauce varies from 10-26%. The salt content of the product should be 1.3 to 3.4%. Good quality vinegar is essential for the preparation of high quality sauce/ketch up. It should contain 5.0-5.5% acetic acid or glacial acetic acid (100% acetic acid) and should be added when the product has thickened sufficiently. Tomato sauce/ketchup generally contains 1.25-1.50% acetic acid. In order to increase the viscosity and prevent the separation of pulp from clear juice, pectin can be added to extent of 0.1-0.2% pectin by weight of the finished product. Add 0.025% sodium benzoate as preservative to the product before bottling and then pasteurize.

Principle
Pickle is an edible product preserved and flavoured in a solution of common salt and vinegar. Spices and oil are also added. They add to palatability of a meal, aid in digestion and are good appetizers too. Pickles are prepared from fruit and vegetables like cauliflower, reddish, carrot, green chili, turnip, cabbage, onion, mango, jackfruit, aonla and lemon etc. Commercial preservation of many pickle relied upon conversion of fermentable carbohydrates by lactic acid bacteria to organic acids during bulk storage and/or the addition of sufficient amount of sugar, vinegar and other ingredients to the fully cured and packed products to preclude any microbial growth. Organic acids, oil, salt and spices all have antimicrobial properties at suitable concentration especially in combination which preserves the pickles. Pickles in brine such as or after fermentation however, need some amount of preservative or pasteurization to prevent the spoilage.

Materials required
Material : Wheat Flour (1000g), Shortening (350 g), Fine Sugar (400 g), Sodium bicarbonate (10 g), Dextrose solution (100 ml) i.e 25 g Dextrose hydrate in 500 ml water, Distilled water (50 ml), salt (8 g).
Equipments: Mixer, rolling pin, Tray, cookies cutter, baking oven etc.
Principle: Cookies are made from soft wheat are having high sugar and fat content. They contain relatively low moisture content and have fairy high shelf life. Biscuits are similar name used in Europe and UK. Cookies are chemically leavened. Sugar and shortening are creamed to form dough with flour and leavening agents. When cookies dough enters the oven, the fat starts melting and sugar is dissolved which allow the cookies to spread as a function of gravity. The leavening agents expand it in all direction and structure is stabilized with high temperature prevailing in the oven.

Materials required
Material : Wheat Flour (550 g), Pearl millet Flour (50 g), Ragi Flour (50 g), Finger millet Flour (50 g), Barley Flour (50 g), Sorghum Flour (50 g), Foxtel Millet Flour (50 g), Maize Flour (50 g), Oat Flour (50 g), Besan (50 g) Shortening (350 g), Fine Sugar (400 g), Sodium bicarbonate (10 g), Distilled water (50 ml), salt (8 g). Equipments: Mixer, rolling pin, Tray, cookies cutter, baking oven etc. Principle: Cookies are made from soft wheat are having high sugar and fat content. They contain relatively low moisture content and have fairy high shelf life. Biscuits are similar name used in Europe and UK. Cookies are chemically leavened. Sugar and shortening are creamed to form dough with flour and leavening agents. When cookies dough enters the oven, the fat starts melting and sugar is dissolved which allow the cookies to spread as a function of gravity. The leavening agents expand it in all direction and structure is stabilized with high temperature prevailing in the oven.

Procedure
1. Mix the dough with ingredients I. Keep it for fermentation till breaks easily without stretching.
2. Put the sponge to mixer. Add salt, sugar, flour and optional ingredients and mix. In last, add shortening. The dough should be soft and very smooth.
3. Let the dough relax for about 30 min. cut pieces of dough weighing 100 g/450g.
4. Mould in along oblong shape and place in baking pans.
5. Proof the moulded dough to a desired height.
6. Bake at 210oC to a golden colour.
7. Cool the loaves overnight.
8. Cut the rusk of desired thickness. Arrange on baking sheets and toast at 190oC till these are crisp and golden brown in colour.
9. Cool and packaged.