eChapters

Introduction
Preservation by using common salt, spices and vinegar is a common method for the preparation of pickles, sauce and chutneys. Salt is mostly used as a preservative in pickles in combination with acid. Sodium chloride is used in brines and curing solutions or is applied directly to the food. The quantity of salt necessary to inhibit growth or harm the cells varies with the type of microorganisms. However, the minimum concentration of salt to act as a preservative is about 12%. Salt (sodium chloride) exerts its preservative action
by performing the following functions:
? Causing high osmotic pressure resulting in plasmolysis of the microbial cells.
? Dehydrating food by tying up the moisture thus making it unavailabl for the growth of microorganisms.
? Salt lowers the water activity and thus has adverse effects on microorganisms.
? Affecting the solubility of oxygen in the food and thus inhibiting the growth of aerobic microorganisms.
? Salt ionizes to yield chlorine ions, which is harmful to microorganisms.
? Chlorine in sodium chloride is a good oxidizing agent & is, therefore, toxic to microorganisms.
 

1. INTRODUCTION

The paradigm of world’s livelihood is built on the basic foundation of natural resources which includes humans, plants, animals, soils and minerals, water and air. But the very livelihood of these resources are at stake because they are strongly linked and dependant on each other. And to add, the material resource namely ‘economy’ has invaded the tranquil habitat and life of the community of natural resources. Thus the present crisis is challenging livelihood of each of these natural resources whether it is human, plant or water or earth and the element of economy is interfering with the natural recourse of human depending on water and soil; and human, plant, animal together are depending on soil, water and air. But when the livelihood of soil, water and air is at stake how human, plant and animal can survive; hence the design of livelihood of world has the essential ingredients of all natural resources.

We humans are selfish and concerned about our livelihood security only and try to over-exploit other natural resources and assumed themselves as the master of all natural resources. Practically, there is war going on between and among natural resources. The world could be better if each natural resource has its own right with prospects to safeguard its livelihood and all resources together with better livelihood could offer the lively world.

2. UTILIZATION OF NATURAL RESOURCES

We should underscore that none of the natural resources are in ‘plenty’ and that we should ‘economize’ on each natural resource to build together the world’s livelihood. The food security of humans can not be attained without plants and plant security can nor be achieved without soil and water and it is impossible to keep secured soil and water without economics of management.

In short, the livelihood security of humans is entirely dependant on all other natural resources coupled with the material resource economy. It is incumbent on us to initiate appropriate steps from gross root to policy levels to make the world better.

1. Introduction

Livestock meat and fish are rich sources of high-quality protein and other valuable nutrients such as polyunsaturated fatty acids, vitamins, and minerals and are an essential part of our healthy diet (Vladau et al., 2008; Mahmud et al., 2018; Mohanti et al., 2019; Mei et al., 2019). Food fraud and adulteration is an age-old distortive practice. The rising incidence of food contaminants and adulterants-induced health issues has challenged consumers to identify and consume safe livestock meat and fish products. Its significance has increased in recent years due to global trade, awareness among consumers, and sociopolitical issues.

1. Introduction

Extrusion of foods is an emerging technology for the food industries to process and market a large number of products of varying size, shape, texture and taste. Extrusion cooking of cereals is becoming more adaptive due to its various advantages over the traditional food processing techniques (White, 1994). Nowadays the extrusion of food is of major importance in the food-processing sector and it is the only process, which covers a wide range of food products such as ready to eat (RTE) breakfast cereals, snack foods, baby foods etc. Elaborate scientific research, technological development and engineering design, which have been done in this field so far, have led to large-scale industrial production. 

SYNOPSIS

In all probability the ancient farmer’s market originated on the streets of villages and later on, on the streets of towns. The street food survived through decades and centuries and now it has assumed its new role in fulfilling the readymade food demand of the working people of mega cities. The street food has now more relevance to the growing urban population. With the lapse of time and migration people to the cities, the business and activities of street food got expanded in qualitative and quantitative terms worldwide.

Polysaccharides comprise several monosaccharide units (more than ten) linked by glycosidic bonds; therefore, they are high molecular weight carbohydrates. They are also called polyanhydrides of simple sugars. The most common monosaccharide unit of polysaccharides is D-glucose. The polysaccharides may differ in their monosaccharide units, molecular weight, chain nature, glycosidic bond types (alpha, beta), and linkages (1-2, 1-3, 1-4, or 1-6). They are tasteless, colorless, amorphous powders that are a little water-soluble. Some may form colloidal solutions. The polysaccharides provide structural stability (structural polysaccharides) to cells, prevent cells and tissues from drying out due to their water-binding properties, and reserve food for the future. Reserved polymeric carbohydrates are osmotically less active and can be stored in large quantities within the cell.
The right and left end of polysaccharides, respectively, are called the reducing and non-reducing ends. Based on the functional aspects, they are grouped in two ways.
• The first way depends on its digestibility—1. Nutrient polysaccharides are (digestible) starch, dextrin, and glycogen, and 2. Structural polysaccharides are (indigestible), chitin and cellulose.
• The second way, depending upon the constituent monosaccharide units, they are 1. Homoglycans (same units), and 2. Heteroglycans (different units).

Abstract

Plantbreeding is an ancientart practiced throughselection ofplants fordesirable traits. Over a period of time it has evolved into scientific discipline with various methodologiesbasedon theories and principles ofgenetics. Since the rediscovery of Mendel’s law, there has been accelerated increase in yield of various crop plants due to development of high yielding varieties. Conventional approaches of following phenotypic selection from a variable population in early generation followed by yield testing in later generations have been highly successful in most of the crop species. This coupled with hybrid varieties led to significant increase in food-grain production during later half of the 20^th century. At present manycrops are facing yield plateau asthey have reached their maximum genetic potential. The growing condition is also deteriorating due to changing climate. There is an urgent need among breeders to utilize full arsenal of techniques available to them to sustain crop productivity. Molecular markers and marker assisted selection has come as a boon to the breeders to increase the efficiency ofselection in early generation breeding especially for traits whose phenotypic evaluation is difficult. Further, transgenic technology has the potential to incorporate genes from diverse sources, thus enriching the gene pool from which breeders can search for specific traits. Although at present there is skepticism about transgenic crops among public but this may become a viable strategy in future.

Abstract

Sustainable agriculture or farming is one that contributes to the overall objective ofsustainable developmenti.e. to meetthe present needs withoutcompromising the ability of the future generations to fulfill their own food needs and related demands from the land. A farming system is a complex, interrelated matrix of soils, plants, animals, power, implements, labour, capital and other inputs controlled by farming families and influenced to varying degrees by political, economical, institutional and social forces that operate at any levels. Research witha farmingsystems perspective has variousobjectivesranging fromincreasing the body of knowledge about farming system. The whole farming rather than the individual crops/enterprises need to be considered in the decision making under the farming systems approach. This is a multidisciplinary whole-farm approach and very effective in solving the problems of small and marginal farmers. Farming systems approach in analyzing the problems of agriculture is gaining lot of importance in recent years. Such a study would throw light on the problems associatedwith different farmingsystems and enable theacademicians and policy makers to formulate and implement appropriate policies for a balanced and integrated agricultural development.

Abstract

Molecular markers play key role in crop improvement. There are severalmarkers such as RAPD, SSR, AFLP, SNP, DArT and many more are available for their practical uses. From the past markers like RAPD, AFLP, and SSR have been used extensively in the crop breeding. Recently new markers such as SNP and DArT have become popular among the researchers of molecular biology for use in genomics-assisted crop breeding. These markers have been applied for study of genetic diversity, germplasm management, cultivar identification, genetic mapping, gene tagging and genomics etc. Though the conventional method of breeding willcontinue to play a primary role in the crop improvement, molecular marker technology is becoming one of its integral components. Agarose-based DNA markers like ISSR, CAPS, RAPD, SCAR and AS (allele specific) have the potential for faster and accurate breeding for target traits through MAS.

2.0. Introduction

Before dealing with the various processes involved in the processing of fruit and vegetables or any food commodity on commercial scale, it is necessary to consider certain important factors such as investment, site, building, water supply, staff, labour etc. which are essential for the successful running of the food processing plant. Processing plant is the premises, buildings, structure and equipment used in the preparation, processing, handling, transportation and storage of any food commodity / fruits and vegetables / the processed products. The design and layout of the food processing plant is of great importance, besides other important factors. The food processing plant may be single storeyed or multi-storeyed depending upon capacity of production and viability of the plant e.g. if the production of the plant is assumed to be small and processing plant have to run only for short duration during the year then single storeyed processing plant can serve the purpose. Plant layout, product layout and process layout are the most important components for setting up of food processing industry and can determine the working efficiency of unit. Sanitary requirements in food processing plant are also important for marketing of the prepared product in national and international market. Sanitary requirement is as important in food processing plant as is the treatment of the effluent waste. For setting up of the food processing plant certain guidelines have been laid out by FPO, 1955.

History of food safety starts with knowledge about food hazards. The term “safe food” can be defined from different angles since the end users are highly heterogeneous. However, the accumulating data and day by day emerging information aboutfood borne diseaseslead to a boom in public awareness about food safety. Food safety can be defined as “The strategies and activities aimed to protect foods from biological, chemical, physical, and allergenic hazards that may occur during all stages of production, distribution, and consumption” (Paperella, 2020). According to the World Health Organization (WHO), unsafe food,which contains hazardousmicroorganisms or chemicals, causesmore than 200 ailments, ranging from diarrhoea to malignancies among which diarrhoea is common. 

Introduction

Vast proportions of the population of the world are dependent on plants as their principal source of food either directly or indirectly. Recent decades have also seen increased numbers of people turning to alternative medical therapy based upon traditional folk medicine or food as a form of medicine. These alternative therapies emphasise the importance of a ‘good diet’ in maintaining and restoring health. Under these circumstances, vast majority of population may see diet therapy, dietary supplements and non-invasive alternative therapies as a safer, less technological and more natural way of maintaining health and treating and preventing individuals from illness. These alternatives may be seen as empowering the consumer and shifting the locus of control away from the medical establishment. This chapter covers many crucial topics to understand the chemistry and bioactivity of the active compounds of plant origin. It also aims to cover the latest research on the bioactive compounds.

1.    The predominant form of fat within fat (adipose) tissue is stored in humans in the form of

(a) Glycogen

(b) Triglycerides

(c) Diglycerides

(d) Monoglycerides

2.    The Thermic Effect of food refers to

(a) The ‘heat’ one feels from eating a chili pepper

(b) The amounts of energy the body spents to process, use and store

(c) The benefits of eating warm foods in cold weather

(d) All of the above

Introduction

Advances in food preservation methods have supported the journey of food science from that of a cookery science to a fast growing industrial technology. Food preservation knowledge deals with the way to prevent spoilage and maintenance of quality in foods. Spoilage is the deterioration in quality brought about by inherent biochemical and chemical changes, as well as microbial metabolism during food storage. Basic principles of food preservation (Frazier et al., 2008) remains the same, but newer methods for achieving the goal is added through research fuelled by a consumer demand for fresh-like foods with convenience and safety. Scientific information on novel processing methods are beautifully compiled (Cullen et al., 2011; Da-Wen Sun, 2014; Tokuþoðlu and Swanson 2015; Doona, 2018).

In-depth knowledge of physiological activities of micro-organisms in presence of preservation agents is essential for preparation of safe foods with prolonged shelf life. Besides this, it is necessary to understand the effect of food constituents on microbial resistance against inactivation agents, to identify critical dose requirement. This profound knowledge would also help to understand kinetics of microbial inactivation and to develop mathematical models suitable for a realistic design of process parameters. For better appreciation of the following sections, readers are encouraged to have fundamental knowledge in microbiology and food processing. The sections in this chapter cover advanced microbiological knowledge pertaining to the preservation aspects of food.

Nano-technology refers to technology on a nano- meter scale, specifically less than 100 nano-meters. The novel nano-particles are tiny spheres (fullerenes) or tubes (nanotubes) made from carbon atoms. It facilitates the development of future inventions transversely a vast array of fields. New nano-particles are being made of silicon, ceramic, polymers or even natural ingredients that break down in the body. The characteristics that make these particles functional in the food industry include optical properties, reactivity to temperature, and biodegradability. They can be used as probes or filled with flavorings or nutrients for delivery. Highlights on the categorisation of agriculture with nano- food technology and nutrition are given in Fig 1.

There are three key elements in nano-technology. They are: (1) substances at nano-scale exhibit novel physical and chemical phenomena with novel functions (2) allowing to measure, control and operate material at the nano-scale that transform them to functions. (3) allowing the union of nano scales of materials for exceptional properties.

Drying of the Spices

Drying is an important mode of preservation and it ensures microbial safety of the spices.The main purpose of drying is to increase the shelf storage and make the seasonal spices available round the year with minute losses of nutrients, flavor, taste and color (Maroulis, 2003). During drying, there is a continuous transfer of heat and mass due to the heat application which eventually leads to moisture removal from the product (Akpinar, 2006) (Hashim, 2014). Since, the sensory, nutritional and functional attributes of spices are partially or totally affected by the drying process, the adequate choice of drying technique becomes requisite. There exists a number of conventional drying methods including solar drying (El-sebaii, 2012), freeze drying (Ciurzy nska 2011), vacuum drying (Nadi, 2012), osmotic dehydration,hot air drying and fluidized bed drying (Onwude, 2016). However, these drying techniques lead to poor quality of the spices because of the longer duration of treatment and high amount of energy. To combat with the issues of poor quality, there has been a significant development of the novel techniques, which includes- microwave, ohmic, infrared, pulse electric field, radio- frequency, ultraviolet, ultrasound, supercritical and heat pump heating, in the drying of the agricultural crops. These novel techniques are found to produce higher quality products as compared to the conventional drying techniques (Moses J. N., 2014). The microwave and radio frequency heating technologies are developed in such a manner that they are capable of partial or complete removal of the conventional methods of heating/ drying (Onwude, 2016). The use of these novel techniques has gained a keen attention for the drying purpose of spices. Some of the researchers have also proved that combination of conventional and novel drying techniques leads to better product output.

1.    Heat transfer by conduction is given by

(a) Boyle’s law

(b) Stefan’s law

(c) Fourier’s law

(d) Charles’ law

2.    Heat flow per hour is proportional to change in

(a) Area

(b) Vapour pressure

(c) Mass

(d) Temperature

1.    UV irradiation is considered better than other irradiation methods in terms of

(a) Physical structure maintenance

(b) Chemical structure

(c) Sensory quality

(d) Microbial quality

2.    Irradiation with UV light is considered as

(a) Sterilization method

(b) Disinfection method

(c) Pasteurization method

(d) Cooking method

3.    UV treatment kills bacteria, viruses, fungi due to its effect on

(a) Metabolic pathway

(b) DNA

(c) Signaling pathway

(d) ATP generation

4.    Effectiveness of UV radiation on micro organisms depends on

(a) Species and strain

(b) Spore formation

(c) Culture and growth

(d) Both (a) and (c)

1. INTRODUCTION

The Green Revolution and subsequent efforts through the application of science and technology for increasing food production in India, have brought self-reliance in food. The imputs given by the Government, State Agricultural Universities, State Departments of Agriculture and other organizations through the evolution and introduction of numerous hybrid varieties of fruits and vegetables and improved management practices have resulted in increased food production. However, the nation still faces the problem of the use of improper methods for the storage of food stuffs and their preservation leading to great wastage of the food produced. So, there is a urgent need for the application of food preservation and processing methods.

Food preservation involves all the processes used to maintain foods with the desired properties or nature for longer time. The process is has moved from an art to a highly interdisciplinary science. Food safety now the first priority of the food production and preservation industry, incorporating innovations and sustainability. The preservation and processing of food however, is not as simple or straight forward as it was in the past. A number of new preservation techniques have been developed to satisfy the current demands of economic preservation and consumer satisfaction in nutritional and sensory aspects, convenience, and safety, absence of chemical preservatives, and environmental safety. Understanding the effects of each preservation method on food has therefore, become critical in all the aspects.

Fourier transform infrared (FTIR) spectroscopy is one of the most effective methods for determining the functional groups and potential molecular interactions between membrane chemical molecules. Understanding of (infrared) IR absorption band placements in the spectrum as wave numbers can be used to identify the various chemical constituents (such as aromatic amides) that may not be visible by X-ray photoelectron spectroscopy.