eChapters

Introduction

Encapsulation may be defined as a process to entrap one substance (active agent) within another substance (wall material). The encapsulated substance, except active agent, can be called the core, fill, active, internal or payload phase. The substance that is encapsulating is often called the coating, membrane, shell, capsule, carrier material, external phase, or matrix. In the food industry, encapsulation process can be applied for a variety of reasons. Encapsulation is a useful tool to improve delivery of bioactive molecules (e.g. antioxidants, minerals, vitamins, phytosterols, lutein, fatty acids, lycopene) and living cells  (e.g. probiotics) into foods [1]. In most cases, encapsulation refers to a technology in which the bioactive components are completely enveloped, covered and protected by a physical barrier, without any protrusion of the bioactive components. Also, encapsulation has been defined as a technology of packaging solids, liquids, or gaseous materials in small capsules that release their contents at controlled rates over prolonged periods and under specific conditions. Produced particles usually have diameters of a few nm to a few mm.

Food provides a sense of wellbeing and comfort and makes people feel good. In this world of a growing population, the need for affordable, safe and good quality food is rising constantly. On the other hand, there is growing awareness of customers who demand that food be produced and supplied hygienically in socially responsible and eco-friendly ways.

Abstract

Recently, the reduction of post harvest food losses around the globe is a critical issue for ensuring future food security. Drying techniques is important option to prevent losses and preserve food for long time. The solar thermal energy required to remove moisture from the food during the drying process can be optimized by designing suitable solar dryers. Moreover, the application of solar energy in drying of agricultural products has tremendous potential, since it can easily provide the low temperature heating required for drying and helps in reduction of CO2 emissions. Hence, the present chapter deals with descriptions of different types of solar dryers used to dry various types of agricultural food products and design of solar dryers. Also, the heat and mass transfer parameters with respect to various process variables to estimate the performance of the food dryer system were analyzed. The advantages of solar dryers in terms of net CO2 emissions mitigation potential and the quality attributes of dried food products are also discussed. It is suggested that properly designed solar dryers having low operational cost compared to electrically heated dryers may prove to be an energy saving device for drying of agricultural products. However, the techno-economical and environmental aspects of various efficient solar dryers are needed to be further studied for applications in various irregular shaped food products.

Abstract
 
Drying is one of the most popular methods used for preserving products and extending their shelf lives by reducing moisture content to a low level to prevent microbial spoilage and moisture-mediated deteriorative reactions. As an efficient technology with high heat and mass transfer rates, impingement drying has been commonly used in various industrial drying such as tissue paper, textiles, photographic films, coated paper, nonwovens, carpets, lumber etc. In the past two decades, air impingement technology has got more and more attention in the field of food and agricultural products processing.

Introduction
 
The future of functional foods is bright and there are several reasons for the growing interest in “functional” foods, such as awareness of personal health deterioration, led by busy lifestyles with poor choices of convenience foods and insufficient exercise; increased incidence of self-medication; increased level of information from health authorities and media on nutrition and the link between diet and health; scientific developments in nutrition research; and a crowded and competitive food market, characterized by pressurized margins. Now, the consumer is well aware of the relationship between diet and health. Consumers understand that the risk for chronic diseases such as heart disease, stroke, colon cancer, and type II diabetes is possibly preventable by modification in their diet pattern. This scientific progress in understanding the relationship of diet to disease, along with increasing health care costs and the consumer’s desire to initiate healthy eating and lifestyle habits, makes this a potentially fertile ground for the development of food products that meet these demands.

1. Introduction

Processed foods have become a way of life in the modern world. Manipulation of chemical and physical properties facilitated by modern food technology and followed by addition of food additives has created a plethora of innovative food products that offer consumers greater convenience, variety, safety, satiety and quality.
Food additives have been in use for centuries for preservation, for providing improved appearance or desired texture and flavour. Preservation of foods started with salting and smoking. The Egyptians used colours and flavours, Romans used saltpeter and in India, turmeric is being used. Similarly additives such as baking powder as a raising agent, thickeners for sauces and gravies and colours- synthetic as well as from natural sources are being used.
Today more than 2500 food additives have been in use mainly due to the spurt in the research activities in food science and technology that are aimed at providing different characteristic functions to foods. Out of these, about 1300 are the flavouring additives.

Abstract

Medicinal herbs are economically and nutritionally important plants, which are rich in health-promoting compounds. Herbs are the backbone of both the traditional Chinese and Indian medicine, which has long history as part of their culture. Ensuring the quality of herbs is a crucial step for integrating the traditional medicine into science-based modern medicine. Drying is an essential technique in preservation of herbs as it affects directly the quality attributes of the dried products, whereas many producers lose much profit due to poor drying techniques. So, employing a suitable drying technology and selection of appropriate drying conditions are very important for producing high quality herb products. The aim of this article is to summarize the advances in drying technologies of medicinal plants, describe the current status and identify future research opportunities. The current work provides more data and information for selecting optimum technology for herb drying and would trigger innovative drying technologies to enhance drying kinetics and quality of herb drying.

Abstract

Food proteins are among the commonly used ingredients by food manufacturers to produce different products with desired characteristics. Due to several nutritional and functional properties, proteins have different functions in various food products in addition to their role in metabolic system of the human body. Dilute or concentrated solutions of pure proteins or unprocessed food products which are rich in protein are very sensitive to deterioration or degradation by microorganisms and thus have short shelf life at ambient temperatures due to their highly moist structure and high protein content. Drying is one of the best methods that can guarantee preservation, a longer shelf life, chemical or thermal stabilization and resistance against other stresses. A full understanding of stresses encountered during drying is needed to choose an appropriate drying process and to optimize this process for maximum product quality. A number of methods have been used by various researchers to dry protein-containing foods. Among these methods, freeze drying and spray drying are the most common techniques. Sun drying, convective hot air drying, vacuum drying, heat pump drying, radio frequency drying as well as combined or hybrid drying methods with two or more of the drying methods have also been developed.

Fish as a cheap source of protein, bioavailable minerals, vitamins and essential fatty acids, ensures global nutritional security. India witnessed around 14-fold increment in fish production from 0.7 million tonnes in 1950’s to 10.43 million tonnes in 2014-15. With a contribution of 5.05% to world’s capture production and 6.6% of total aquaculture fish production, India emerged as one among the most progressive fish producing countries in the world. Fisheries as a major agricultural sector, constitutes 0.92% of total GDP and 5.58% of total agricultural GDP of India. With the global fish export value of 148,147 million USD, India ranked seventh position among the top fish exporters of the world. The sector is crucial in securing food supply, job opportunities, nutritional needs and earning foreign exchange for the country, cataloguing it as a sunrise sector of Indian economy.

Technological developments in harvest sector

Introduction of new materials for fishing gears, mechanization of fishing crafts and modern electronic technologies for navigation and fish location, paved way for the significant increase in fish production in India over the years. ICAR-CIFT, Cochin has been involved in the design and optimization of a range of crafts and gears since its inception, which gave a major fillip to the harvest sector of Indian fisheries. Considering the plateauing/decline in catches perceptible since last two decades, ICAR-CIFT has shifted its focus from increasing production to responsible harvest of resources. As a result a large number of technologies for sustainable harvest and green technologies with reduced emissions were developed.

1. INTRODUCTION

Mushrooms are edible fungi of commercial importance and their cultivation has emerged as a promising agro-based land-independent enterprise. There are about 20 varieties of mushrooms being cultivated throughout the world for food. In India, only white button mushroom (Agaricus bisporus J.E. Lange Imbach), oyster mushroom (Pleurotus spp. [Fr.] P. Kumm) and paddy straw mushroom (Volvariella volvacea [Bul.] Singer) are grown commercially. Of these, white button mushroom contributes ~90% of the total production. Mushrooms have been recognized as an alternate source of good quality protein and produce the highest quantity of protein per unit area from agro-wastes. Besides, they provide potentiality for generating employment, improving economic status of growers, help in checking pollution and earn foreign exchange.

Out of the total production about 45% of mushrooms produced are consumed in the fresh form while the other 55% are processed, with 5% in dehydrated form and 50% in canned form. This is because their shelf-life in the fresh form is very short and hence mushrooms are traded in the world market mostly in the processed form. Fruiting bodies (reproductive phase) of Agaricus are appreciated not only for texture and flavour but also for their chemical and nutritional characteristics.

Introduction

Fermentation has been an integral part of food processing throughout the history of mankind. In beginning, it was mainly preservation method, then it became key process in substantial sensory characteristic development and now it is utilized to improve overall properties of outcome from major industries like bakery, dairy, beverages, etc. The human understanding of controlled fermentation process changes its fundamental objective by exploring its success in development of rheological and texture characteristics.

The biochemical transformation of raw food due to fermentation affects the organoleptic as well as rheological properties of a product. The changes in rheological as well as sensory properties is related with the modification of major component by the action of microorganism. For example, transformation of polysaccharides in bread dough by action of yeast produce ethanol, CO₂ and other simple compound which modify sensory as well as rheology of dough. The major micro-structural, bio-compositional and bio-chemical changes are due to microbial action are frequently described to understand the effect of fermentation on rheological as well as sensory properties of food products. The rate and quality of these associated major changes mainly depends upon concentration of saccharides for growth of microorganism as well as nature and existing microflorae. Hence, a proper monitoring of changes in rheological and sensory properties is necessary to optimize the controlled fermentation as well as design of process parameters from engineering and consumer point of view.

The biochemical changes directly responsible for changes in basic rheological and sensory characteristic including flow behavior, consistency, viscoelastic properties, hardness, adhesiveness, color, aroma, flavor and mouthfeel. The food industry is so diverse and exploring new and possibilities to catch diverse consumer worldwide, a proper understanding of effect of fermentation on mentioned properties will be key to hold competitive market. Hence, the present chapter will cover the basics of rheology and its role in food industry, effect of fermentation on rheological and sensory attributes of major class of food.

Food preservation involves treating and safely handling food to prevent or delay spoilage while retaining colour, texture, flavour and nutritional value. Food deterioration may result from microbial growth, indigenous enzymes, oxidation, physical damage, insects, moisture, temperature and other environmental conditions. Bacteria, fungi and other microorganisms contaminate food through soil, water, air and biological sources. The effectiveness of preservation therefore depends on controlling intrinsic factors such as pH, water activity, nutrients and redox potential, together with extrinsic factors such as temperature, humidity and storage atmosphere. Understanding these mechanisms provides the scientific foundation for selecting safe and effective preservation methods.

1. INTRODUCTION

Vegetables occupy a prominent position in our diet especially to tone up our digestive system and provide nourishment. Regular use of vegetables, supply many essential health building and protective substances, such as vitamins and minerals. India ranks second in vegetable production in the world. The abundant production of vegetables during the season, results in a glut. Consequently, a large quantity of vegetables gets spoiled resulting in a considerable loss of natural resources. Therefore, preservation is the best way to save the wastage of vegetables and make them available even in the off-season (Plate 1).

Food Safety has been the buzz word in recent days as there are increasing consumer awareness on hazards present in food as well as the ombudsmen role played by independent media. Although regulatory regime across the world has taken proactive steps, in most of the cases it has been a knee-jerk reaction to the impending crisis. Defining the actual goal of food safety has been an arduous task as there are umpteen interrelated factors that influence the intended goals. Some of the definitions on food safety put forward by international agencies are as follows:

Storage : It can be defined as keeping the commodity fresh or processed in safe condition with minimum of deteriorative changes for later use.

Reasons of Deterioration During Storage

Preservation of food (fruits and vegetables) in common salt sand vinegar is called pickling. It is one of the most ancient method of preservation of fruits and vegetables. Pickling is the result of fermentation by Lactic acid forming bacteria which are found in large number on the surface of fruits and vegetables. They can grow in acidic medium and in the presence of 8-10 percent salt solution. The growth of majority of undesirable bacteria is inhibited. Lactic acid most active at 30 °C temperature. This temperature should be maintained during the process of pickling.

Preparation of pickles

Pickles are prepared with salt, vinegar and oil or combination of these ingredients. Spices are also used for pickle preparation.

Introduction

Food and nutraceuticals are obtained from various agricultural resources available in this planet. Many types of bio-active compounds are available in small quantities in the plants and animals which are evidenced to improve performance of various organs, increase in immunity and cure for some diseases. Last decade evidences several advancements in developing phytochemical formulations which can be used as a cure for many diseases as well as helps in boosting immunity in human being. Such materials exist in different form, structure and chemical compositions. Examples of such chemicals are phenolic and organosulphur compound (Pascall 2011). The vegetables, fruits and seeds are used without further processing. Some plants are subjected to cooking before its consumption. Many industries are carried out extraction of bioactive compounds and developed products in the form of tablets, powders and liquids which are available in the market. In order to make commercial process more economic and feasible, long term storage of plant residues (Raw materials) as well as the prevention of the extracts emerges as essential requirement for the industries. Moreover, the products requires suitable packaging solution to increase its self-life, preventing it from the influences of environment, and to make viable solution for easy access which makes it more user-friendly. Suitable packaging solution is required for mainly the three reasons: (i) prevention. (ii) protection and (iii) presentation. Prevention is required in-order to avoid deterioration of the packaged items due to microbial growth, loss in moisture and enzymatic action. Protection is required for the purpose of protecting the packaging materials from the contamination as well as from the environment impact and rough handling. Presentation is equally important to provide it an aesthetic look to make it more approachable to the consumers. Moreover, packaging also offers “labelling for easy identification, warnings, instructions, and nutritional information, ease of transportation” (Pascall 2013).

The operation and maintenance of dehusking, dehulling, degerming, and drying equipment are crucial in ensuring the efficiency and longevity of these machines in grain and seed processing industries. These machines play a vital role in removing husks, hulls, and germs from grains, as well as reducing moisture content to enhance storage stability. Proper handling and regular maintenance not only improve performance but also reduce downtime and operational costs. Dehuskers are used to remove the outer husk from grains like paddy and millet. Their efficiency depends on factors such as roller pressure, feed rate, and machine alignment. Routine maintenance involves checking for wear and tear on rollers, adjusting pressure settings, and ensuring that all moving parts are well-lubricated. Similarly, dehullers remove the outer shell of seeds and grains, requiring careful calibration to avoid excessive grain breakage. Blade sharpness, motor performance, and sieve integrity should be regularly inspected to ensure optimal functioning. Degermers are employed to separate the germ from the endosperm in grains like maize. This process enhances the shelf life of processed products and improves their quality. Regular maintenance of degermers involves inspecting the abrasion plates, checking the feed rate, and ensuring that airflow mechanisms are clear of obstructions. Any malfunction can lead to uneven separation, affecting the final product quality. Dryers are essential in reducing the moisture content of grains to prevent microbial growth and spoilage. They require proper temperature control, uniform airflow, and regular cleaning of heat exchangers and drying chambers. Overheating or under-drying can compromise the grain quality and lead to storage losses. Timely inspections of sensors, air ducts, and burner efficiency help maintain effective drying operations. A well-planned operation and maintenance routine ensures these machines function optimally, increasing productivity and product quality while reducing energy consumption and repair costs.

Water is an essential component of all living things. Although once believed as a resource with a never-ending supply, it has now been understood that water is becoming increasingly scarce and therefore a proper management is necessary to keep a sustainable food production (Kannan & Anandhi, 2020). A continuous and safe supply of water is indispensable for the food industry where it has numerous applications along the agriculture and food production processes.

At present, food and nutrition security are the prime aspects which need to be addressed in an efficient way. It has been projected that by 2050 the global population will reach 9.2 billion which in turn enhances annual demand for agricultural products by 1.1 per cent from 2005 to 2050 (McKenzie and Williams 2015).