Food Processing And Technology

Secondary processing of cereals includes the following processes: fermentation, baking, puffing, flaking, frying, and extrusion.
– Fermentation: It is a process which includes the breakdown of carbohydrates by microorganisms, using bacteria or yeast, which produces organic acids and alcohol. Fermentation increases digestibility.
– Baking: It includes heating flour-based dough in an oven to convert it into an edible product, such as bread.
– Puffing: Puffing involves rapid expansion of grains by sudden heating or pressure change to create light and crunchy products.
– Flaking: Flaking involves processing grains into thin flakes which can be further used in breakfast cereals or other ready-to-eat products.
– Frying: Frying involves cooking grains in oil to create snacks and other products, for example, fried rice, pakoras etc.
– Extrusion: Extrusion involves passing the grain through a machine which forces it into different shapes. This is used for creating many products like snack pellets.

Jelly fails to set: Jelly may not set properly if there is an imbalance of the ingredients.
Cloudy or foggy jelly: The resulting jelly can sometimes be cloudy or foggy due to improper processing or unsuitable raw materials.
Formation of crystals in jelly: Crystals can form in jelly due to high sugar content or if there is improper dissolution of sugar.
Syneresis or weeping of jelly: Syneresis refers to the weeping of liquid, or separation of liquid from jelly which results in poor texture of the final product.

Guava is often considered suitable for making jelly because it contains pectin, which is needed for a firm texture in the jelly.

Wheat flour is a staple ingredient used for making a variety of food products worldwide.
Different types of wheat flour are produced by varying the degree of milling, extraction, and refinement.
1. Whole wheat flour: This flour is made by grinding the entire wheat kernel, including bran, germ, and endosperm.
It is high in fiber, vitamins, and minerals, making it healthier than refined flour.
Whole wheat flour is commonly used for making chapatis, rotis, whole-grain bread, and bakery items.
2. Refined wheat flour (Maida): Maida is produced by removing the bran and germ, leaving only the endosperm.
It is finely milled and white in color.
Refined flour is used for baking cakes, pastries, biscuits, noodles, and various snacks due to its soft texture and high gluten content.
3. Semolina (Sooji or Rava): Semolina is coarsely ground endosperm of wheat.
It is used for preparing upma, halwa, pasta, and some varieties of bread and bakery products.
4. Atta: In India, atta refers to stone-ground whole wheat flour.
It retains more fiber and nutrients compared to maida and is mainly used for making traditional Indian flatbreads like chapati and paratha.
Choosing the right type of flour depends on the end product, nutritional preference, and texture required in cooking or baking.

Preserving fruits and vegetables is necessary for many reasons, especially in a country like India which is the second-largest producer of horticultural crops.
1. Prevents spoilage: Fruits and vegetables are perishable commodities with high moisture content, making them highly prone to spoilage by microorganisms and physical damage.
Without preservation, a significant portion of produce is wasted during post-harvest handling, storage, and transportation.
2. Ensures year-round availability: Preservation methods like canning, drying, freezing, and pickling help extend the shelf life of seasonal produce.
This ensures that consumers have access to nutritious fruits and vegetables throughout the year, even when they are not in season.
3. Adds value and income: Processing and preservation convert surplus and low-grade produce into value-added products like jams, jellies, pickles, squashes, and dried fruits.
This helps farmers and entrepreneurs earn better returns and reduces economic losses due to market gluts.
4. Enhances food security: Preserved fruits and vegetables contribute to food security by bridging gaps between production and consumption periods.
They also support rural employment and development of agro-based industries.
Overall, preservation is vital for minimizing wastage, stabilizing prices, and ensuring a steady supply of healthy foods to consumers.

Determining the correct end point is important in jelly preparation to ensure proper setting and desired texture.
There are several traditional methods used to judge the end point of jelly making:
1. Sheet or Flake test: A small amount of hot jelly is dropped on a cold plate. If it forms a sheet or breaks with wrinkles when pushed, the end point is reached.
2. Drop test: A drop of jelly is allowed to fall from a spoon. If it falls as a single mass without flowing, the setting point is correct.
3. Temperature test: Using a thermometer, the end point is usually around 105 to 106 degrees Celsius for proper jelly setting.
4. Weight test: Some use weight loss during boiling as an indication of reaching the end point.
These methods help achieve the right consistency and prevent undercooking or overcooking.

In India, only a small portion of total horticultural produce is processed compared to developed countries.
On average, about 2–3 percent of India’s fruits and vegetables are processed into value-added products like jams, pickles, juices, and canned foods.
This percentage is quite low due to factors such as lack of adequate cold storage, processing infrastructure, and market linkages.
Increasing the share of processing can help reduce post-harvest losses, improve farmer incomes, and add more value to horticultural produce.
The Government of India is taking initiatives like Mega Food Parks and cold chain projects to boost the food processing sector.

A home scale unit refers to a small-scale processing setup for preparing value-added products like pickles, jams, or preserves at household level.
The typical production capacity of a home scale unit ranges from 10 to 20 kilograms per day depending on the type of product and equipment used.
Such units are designed to process small batches to meet household or small market demands.
Home scale units are popular for cottage industries, self-help groups, and micro-entrepreneurs who prepare quality products with minimal investment.
They also help utilize surplus fruits and vegetables and generate additional family income.

A disaccharide is a type of carbohydrate formed by the combination of two monosaccharide molecules.
One common example of a disaccharide is Sucrose, which is the sugar commonly used in households.
Sucrose is formed by the chemical bonding of one glucose molecule and one fructose molecule.
It is naturally found in sugarcane, sugar beet, fruits, and vegetables.
Other examples of disaccharides include lactose (milk sugar) and maltose (malt sugar).
Disaccharides are an important source of energy and are broken down into simple sugars during digestion.

Class II preservatives are synthetic chemical preservatives used to extend the shelf life of processed fruits and vegetables.
In India, as per the Food Safety and Standards Authority of India (FSSAI) regulations, commonly permitted Class II chemical preservatives include three main chemicals:
These are Sulphur dioxide, Benzoic acid, and Sorbic acid.
Sulphur dioxide is mainly used in fruit juices, jams, and dried fruits to prevent browning and spoilage.
Benzoic acid and its salts like sodium benzoate help inhibit the growth of yeasts and molds in fruit syrups and pickles.
Sorbic acid is also used as an effective preservative in fruit pulps and juices.
These chemical preservatives must be used within the prescribed limits to ensure food safety and consumer health.

The sheet test is a simple and traditional method used to find the end point of fruit jam preparation.
While making jam, it is important to know when the mixture has reached the right consistency to set properly when cooled.
In the sheet test, a small amount of boiling jam is dropped onto a cold plate and allowed to cool slightly.
If the jam forms a gel-like consistency and folds or wrinkles when pushed with a finger or spoon, it indicates that the end point has been reached.
This ensures that the jam will have the desired spreadable texture and will not be too runny or too hard.
The sheet test is a quick and practical method often used by small-scale processors and home makers.

Cold sterilization is a method of preserving food products using ionizing radiation like gamma rays or electron beams to kill or inactivate microorganisms, insects, or parasites without raising the product’s temperature significantly.
It is also called irradiation and is used to extend shelf life, prevent sprouting, and reduce post-harvest losses.
Cold sterilization is safe, leaves no harmful residues, and preserves the nutritional quality of food.
Below are the irradiation dose requirements for some common produce:
1. Onions:
Dose: 0.03–0.12 kGy
Purpose: To inhibit sprouting during storage and extend shelf life.
2. Potatoes:
Dose: 0.05–0.15 kGy
Purpose: To prevent sprouting and maintain quality during storage.
3. Garlic:
Dose: 0.05–0.15 kGy
Purpose: To inhibit sprouting and extend storage period.
4. Shallots:
Dose: 0.03–0.12 kGy
Purpose: To control sprouting and prolong shelf life.
Irradiation is approved by food safety authorities and helps reduce storage losses without the use of chemical sprout inhibitors.

The title Father of Canning is given to Nicolas Appert, a French inventor and chef.
In the early 19th century, Nicolas Appert developed the method of preserving food by heating it in sealed glass jars.
His technique was a groundbreaking solution to the problem of food spoilage during long military campaigns and voyages.
This innovation laid the foundation for the modern canning industry, which later evolved to use tin cans instead of glass.
Appert’s work revolutionized food preservation by making it possible to store food safely for extended periods without refrigeration.
He published his findings in 1810, earning recognition as the pioneer of modern food canning.

Low temperature, like refrigeration or freezing, is a widely used method to preserve food by slowing down the growth of microorganisms and delaying spoilage.
However, it is not considered a permanent preservation method because it only temporarily inhibits microbial activity and enzymatic reactions.
Once the food is removed from cold storage and exposed to normal temperatures, bacteria, fungi, and enzymes can become active again and cause spoilage.
Unlike methods such as canning or drying, which can extend shelf life for months or years even at room temperature, cold storage depends on continuous energy input.
If the cooling system fails or there is a power cut, the stored food can spoil quickly.
Therefore, low temperature is best suited for short- or medium-term preservation rather than a permanent solution.

The Fruit Products Order (FPO) is a regulatory standard under the Ministry of Food Processing Industries in India.
It defines the minimum quality requirements for various processed fruit products, including jams, jellies, and preserves.
As per the FPO specifications, fruit jam must contain at least 45% prepared fruit pulp or puree by total weight.
This ensures that the product delivers the natural taste, aroma, and nutritional benefits of real fruit.
Manufacturers must also maintain the required Total Soluble Solids (TSS) content, usually around 65%, to ensure good texture and preservation.
Strict adherence to this standard helps maintain consumer trust and ensures consistent product quality in the market.
Producers who fail to meet this standard may face legal action and penalties.