...ANALYSIS OF FOOD PRODUCTS FOOD SCIENCE 581 Instructor Prof. D. Julian McClements Room 238, Chenoweth Lab Tel: 545 1019 Email: mcclements@foodsci.umass.edu Course Description Food products are analyzed for a variety of reasons, e.g., compliance with legal and labeling requirements, assessment of product quality, determination of nutritive value, detection of adulteration, research and development. The lectures will cover the basic principles of analytical procedures and techniques commonly used to provide information about the chemical composition, structure and physical properties of food materials. The aim of the laboratory classes is to give students experience in performing food analysis experiments, analyzing data and reporting their findings. In addition, students are expected to work in teams on a special project where they will identify and critically assess the most appropriate analytical methods for analyzing the properties of a particular food product. [4 Credits]. Textbooks * Introduction to Food Analysis. S.S. Nielsen, 1998. Aspen Publishers - The best general overview of food analysis techniques currently available. (Required). * Food Analysis: Theory and Practice. Y. Pomeranz and C.E. Meloan, Chapman and Hall - General overview of food analysis techniques (Useful) * Food Analysis: Principles and Techniques. D.W. Gruenwedel and J.R. Whitaker, Marcel Dekker - General overview of food analysis techniques (Useful) * Analytical Chemistry of Foods...
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...Review Biology Test #1 Chapter 3: Water and life • Polar covalent bonds in water result in Hydrogen bonding between the molecules. These bonds give water its special properties • In presence of water, ionic bonds are weak and covalent bonds are strong. Without water, ionic bonds are stronger. • Each water molecule can make 4 hydrogen bonds. • Water properties: 1. Polarity 2. Surface tension 3. Cohesion 4. Adhesion 5. Capilarity 6. High specific heat 7. Heat bank 8. Heat of vaporization allows evaporation cooling. 9. Abundant and versatile solvent 10. Solid is less dense than liquid 11. It is a reactant and a product in many biological reactions (Photosynthesis, dehydration reaction, hydrolysis…) 12. It can ionize into H3O+ and OH- • When substances dissolve in water, water molecules form hydration shells by breaking their attractions to other water molecules and attracting to the solvate particles. • The dissociation of water molecules into Hydronium and hydroxide ions is a reversible reaction that occurs in a state of equilibrium (pure water). • The concentration of each ion in pure water is 10-7 M. [OH-][H3O+] = 10-14 M. This way, whenever we know the concentration of one ion, we can calculate the concentration of the other. • Adding acids and bases can change these concentrations of ions in water • When acids dissolve in water, they donate H+, increasing the concentration of hydrogen ions. This results in an acidic solution • When bases dissolve in water...
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...1. Write an essay on protein structure and synthesis Protein synthesis is a cellular process leading to the production of proteins. This term is also synonymous to protein translation. It begins with a sequential process of transcription of DNA into mRNA, which is then used as input for translation after exon-intron splicing. The addition of successive tRNA molecules based on the code of mRNA matched up by base-pairing through their anti-codons in the ribosomes creates the nascent protein. After the protein chain has been synthesized, post-translation modification occurs, e.g. phosphorylation, motifs added to the protein. This may happen at various levels: secondary (alpha-helix, beta-sheets, turn, random coiling), tertiary and quarternary. Protein synthesis is also the process wherein peptide bonds between two amino acids whose formation is controlled. The synthesis begun when the mRNA combines in a little subunit of ribosomes close to an AUG sequence in mRNA. Start codon which is the AUG codon is being such because it does the coding of the first amino acid to be made of protein. “The AUG codon base-pairs with the anticodon of tRNA carrying methionine. A large ribosomal subunit binds to the complex, and the reactions of protein synthesis itself can begin. The aminoacyl-tRNA to be called for next is determined by the next codon (the next three bases) on the mRNA. Each amino acid is coded for by one or more (up to six) codons” (Center for Bioenergy and Photosynthesis...
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...expected to know these concepts for future use and assessment. This introductory material will not be covered in detail during class time. Chapter 1: Introduction: Themes in the Study of Life 1. Explain the importance of a biological hierarchy in terms of biological organization. 2. Why must scientists study the interactions of organisms with each other and the environment? 3. Comment on the relationship between structure and function in biology. 4. How specifically is the cell life’s basic unit of structure and function? 5. What is the significance of DNA to organisms? 6. Explain the basic concept of a biological feedback system. How does it work? 7. Explain briefly how life’s vast organisms are classified. Give the basic ideas. Make sure to include domains in your discussion. 8. Explain Darwin’s mechanism of evolutionary adaptation called natural selection. 9. Explain why “editing” is an appropriate metaphor for how natural selection acts on a population’s heritable variations. 10. Why do “science” and “inquiry” fit so...
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...large molecules from a small set of molecules 2. Define monosaccharides, disaccharides, and polysaccharides and explain their functions 3. Define lipids, phospholipids, and steroids and explain their functions 4. Describe the chemical structure of proteins and their importance to cells 5. Describe the chemical structure of nucleic acids and how they relate to inheritance Copyright © 2012 Pearson Education, Inc. Rearrange these in the correct order: INTRODUCTION TO ORGANIC COMPOUNDS © 2012 Pearson Education, Inc. 3.1 Life’s molecular diversity is based on the properties of carbon Carbon-based molecules are called organic compounds. Methane (CH4) is one of the simplest organic compounds. – Four covalent bonds link four hydrogen atoms to the carbon atom. – Each of the four lines in the formula for methane represents a pair of shared electrons. © 2012 Pearson Education, Inc. Three representatives of methane (CH4) Structural formula Ball-and-stick model Space-filling model The four single bonds of carbon point to the corners of a tetrahedron. Different bond angles and shapes occur when carbon atoms form double bonds. Hence, a molecule’s shape determines its function 3.1 Life’s molecular diversity is based on the properties of carbon Compound composed of only carbon and hydrogen are called hydrocarbons. Carbon, with attached hydrogens (aka carbon skeleton), can bond together in chains of (i) Various lengths (ii)...
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...catalogue record for this book is available from the British Library ISBN 978-1-907769-02-3 First published in May 2010 by CT Publications Copyright © Dr Robert Mitchell 2010 The right of Robert Mitchell to be identified as the author of this work has been asserted by him in accordance with the Copyright and Designs and Patents Act 1988. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording or any information storage and retrieval system, without permission in writing from the publisher at the address below. Published in 2010 by CT Publications* 40 Higher Bridge Street Bolton Greater Manchester BL1 2HA Edition 10 9 8 7 6 5 4 3 2 1 *CT Publications is owned by Chemistry Tutorials located at the same address. Copyright © Dr Robert Mitchell 2010 www.biologytutorials.co.uk 0800 040 7901 3 4 AQA BIOL5: The synoptic essay CONTENTS 1. Be aware of the task you face ............................................................................ 6 What is Synoptic? ........................................................................................... 6 Will I have to learn everything? ........................................................................ 6 A Synoptic Carbon Atom .................................................................................. 6 Which Content is Synoptic? ............................................
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...2.3 Chemistry of water Water is a polar molecule The shape of a water molecule and its polarity make hydrogen bonding possible, A hydrogen bond is a weak attraction between a slightly positive hydrogen atom and a slightly negative atom. (They are partial charging) * Can occur between atoms of different molecule or within the same molecule * A single hydrogen bond is easily broken while multiple hydrogen bonds are collectively quite strong. * Help to maintain the proper structure and function of complex molecules such as proteins and DNA. Oxygen attracts the shared electric and is partially negative Hydrogens are partially positive. Properties of water * Water molecules cling together because of hydrogen bonding * This association gives water many of its unique chemical properties * Water has a high heat capacity * The presence of many hydrogen bonds allow water to absorb a large amount of thermal heat without a great change in temperature * The temperature of water rises and falls slowly * Allows organisms to maintain internal temperatures. * Water has a high heat of vaporization * Hydrogen bonds must be broken to evaporate water. * Bodies of organism cool when their heat is used to evaporate water. * Water is a good Solvent * Water is good solvent because of its polarity * Polar substances dissolve readily in water * Hydrophilic molecules dissolve in water (sugar) ...
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...What is nutrition? Why is nutrition essential to our daily lives? | “As molecular biology, biochemistry and genetics advance, nutrition has become more focused on the steps of biochemical sequences through which substances inside us and other living organisms are transformed from one form to another - metabolism and metabolic pathways” (Bellavia, 2013) The focus of Nutrition is on diseases, how to prevent or try to slow down conditions or problems by using a healthy diet. Nutrition also is involved in figuring out how certain diseases, or cancers may be caused by environmental factors, poor diet as with a people with malnutrition, and allergies to food. Nutrition is so important that major food manufactures employ scientists and nutritionists to help them educate and research. | 2. What is the connection between nutrition and health? | Nutrition and health are dependent on one another. Doctors will trace many emotional and physical problems to diet and lack of vitamins and minerals. Our primary source of energy is food with vitamins and supplements as substitutes. Everyone tries to have a well balanced diet to have a long health life, one that decreases the chance of acquiring a disease, or even help us recover when we are sick. In contrast, a sedentary lifestyle and poor chose of foods can cut our life span and set us up for a plethora of diseases and deformities. Our brain depends on carbohydrates, fatty acids, and vitamin B-12 in order to function properly. Our bones...
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...Biology guide First assessment 2016 Biology guide First assessment 2016 Diploma Programme Biology guide Published February 2014 Published on behalf of the International Baccalaureate Organization, a not-for-profit educational foundation of 15 Route des Morillons, 1218 Le Grand-Saconnex, Geneva, Switzerland by the International Baccalaureate Organization (UK) Ltd Peterson House, Malthouse Avenue, Cardiff Gate Cardiff, Wales CF23 8GL United Kingdom Website: www.ibo.org © International Baccalaureate Organization 2014 The International Baccalaureate Organization (known as the IB) offers four high-quality and challenging educational programmes for a worldwide community of schools, aiming to create a better, more peaceful world. This publication is one of a range of materials produced to support these programmes. The IB may use a variety of sources in its work and checks information to verify accuracy and authenticity, particularly when using community-based knowledge sources such as Wikipedia. The IB respects the principles of intellectual property and makes strenuous efforts to identify and obtain permission before publication from rights holders of all copyright material used. The IB is grateful for permissions received for material used in this publication and will be pleased to correct any errors or omissions at the earliest opportunity. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted...
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...elements make up 96% of the human body. These are O, C, H and N. The other elements account for the remaining 4%. Trace Elements Certain elements are needed in trace amounts. These are also essential to life. Eg. The human body needs trace amounts of boron, chromium, iron, iodine, etc. Humans need 0.15 mg of iodine each day. If iodine is deficient or in excess, a goiter develops – due to malfunctioning of the thyroid gland. Properties of Atoms All atom have a neutral charge because of the following: In nucleus of atom are protons that have a positive charge (p+) and neutrons that have a neutral charge. Outside of the nucleus are the electrons. Electrons have a negative charge. The number of electrons is equal to the number of protons: so negative charges cancel out the positive charges. Atomic Number= number of protons (also number of electrons) Atomic Weight = number of protons + number of neutrons Atomic weight is the average weight number of isotopes for one elements. Atoms for one element have different numbers of neutrons and are called isotopes. Isotopes = different isotopes of an element have the same atomic # but different atomic weights. Example: Carbon – 12, Carbon – 13 and Carbon – 14 all have the same # of protons (i.e. 6 protons), but, # of neutrons vary. C12 has 6 neutrons, C13has 7 neutrons and C14 has 8 neutrons. Hence they all have the same molecular number, ie. 6, but different atomic weights: viz. 12, 13 and 14, respectively. Radioactive...
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...INTRODUCTION Mung bean (Vigna radiata L. Wilczek) sprouts can be considered one of the most common vegetables consumed in the Philippines due to availability and nutritional value (Del Rosario, 2003 and FNRI, 1997). One cup of raw mung bean sprouts contains 48 calories, 6.5 grams of protein, 1.5 grams of fat, and 5.6 grams of carbohydrate. One cup of cooked bean sprouts contains 48 calories, 6.6 grams of protein, 1.8 grams of fat, and 4.6 grams of carbohydrate. In addition, sprouts are a good source of minerals and vitamins, particularly vitamins B1, B2, and C (http://ianrpubs.unl.edu/horticulture). Mung bean sprouts are low in calories and exceptionally high in potassium. A nutritious sprouted mung bean offers the same amount of vitamin A as a lemon, the niacin of a banana, the thiamine of an avocado, the riboflavin of a dried apple, the carbohydrate content of a melon and the ascorbic acid of a loganberry (http://www.specialtyproduce.com). The sprouting process encourages the rapid growth of microorganisms that reach very high numbers in the finished product (Fu et al., 2000). Seed sprouting provides an excellent environment for the growth of many types of organisms. The release of nutrients from the sprouting seeds, the moisture resulting from the irrigation process, the aerobic conditions, pH and temperatures favorable to mesophiles all contribute to the rapid expansion of microbial population, including food pathogens, during sprouting. Population as high as...
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...Barbados CXC A10/U2/07 ii Contents RATIONALE.....................................................................................................................................................1 AIMS ..................................................................................................................................................................1 SKILLS AND ABILITIES TO BE ASSESSED ...............................................................................................2 PRE-REQUISITES OF THE SYLLABUS .......................................................................................................5 STRUCTURE OF THE SYLLABUS ..............................................................................................................5 UNIT 1 : BIOMOLECULES, REPRODUCTION AND DEVELOPMENT MODULE 1 : CELL AND MOLECULAR BIOLOGY ...........................................................7 MODULE 2 : GENETICS, VARIATION AND NATURAL SELECTION ....................... 12 MODULE 3 : REPRODUCTIVE...
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...Cell Biology Studies VI Practical 7 Cell Biology Studies VII Practical 9 Cell Biology Studies IX Practical 10 Cell Biology Studies X - Experiment Description Page Writing of Lab Reports Identification of Biomolecules 5 13 Identification of Unknown Carbohydrate Solutions and Investigation of Action of Saliva and HCl in Carbohydrate Solution at Two Different Temperatures Investigation of the Effects of Catalase Concentration on Hydrogen Peroxide Decomposition 20 Synthesis of Starch Using an Enzyme Extracted from Potato Tuber Investigation of the Effects of Different Catalytic Conditions on Hydrogen Peroxide Decomposition Microscopy 27 Practical 6 Cell studies II Practical 7 Cell studies III Extraction of Cell Organelles by Cell Fractionation Determination of Solute Potential of Potato Cell Sap 47 Practical 8 Cell studies IV Effects of Different Treatments on Stained Potato Cells 64 Practical 9 Energetics I Respiration of Germinating Beans 67 Microscopic Examination of Cells at Various Stages of Plant Mitosis and Meiosis DNA, Mitosis and Meiosis Modelling 71 Respiration of Yeast 93 Practical 3 Enzyme studies I (Experiment 1) Optional: Practical 3 Enzyme studies I (Experiment 2) Practical 4 Enzyme studies II Practical 5 Cell studies I - - Practical 10 Energetics II Lab manual version 6_201505 FHSB1214 Biology I & FHSC1214 Fundamentals of Cell...
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...Cell Biology Studies VI Practical 7 Cell Biology Studies VII Practical 9 Cell Biology Studies IX Practical 10 Cell Biology Studies X - Experiment Description Page Writing of Lab Reports Identification of Biomolecules 5 13 Identification of Unknown Carbohydrate Solutions and Investigation of Action of Saliva and HCl in Carbohydrate Solution at Two Different Temperatures Investigation of the Effects of Catalase Concentration on Hydrogen Peroxide Decomposition 20 Synthesis of Starch Using an Enzyme Extracted from Potato Tuber Investigation of the Effects of Different Catalytic Conditions on Hydrogen Peroxide Decomposition Microscopy 27 Practical 6 Cell studies II Practical 7 Cell studies III Extraction of Cell Organelles by Cell Fractionation Determination of Solute Potential of Potato Cell Sap 47 Practical 8 Cell studies IV Effects of Different Treatments on Stained Potato Cells 64 Practical 9 Energetics I Respiration of Germinating Beans 67 Microscopic Examination of Cells at Various Stages of Plant Mitosis and Meiosis DNA, Mitosis and Meiosis Modelling 71 Respiration of Yeast 93 Practical 3 Enzyme studies I (Experiment 1) Optional: Practical 3 Enzyme studies I (Experiment 2) Practical 4 Enzyme studies II Practical 5 Cell studies I - - Practical 10 Energetics II Lab manual version 6_201505 FHSB1214 Biology I & FHSC1214 Fundamentals of Cell...
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...ate Aptitude Test in Engineering GATE 2014 Brochure Table of Contents 1. Introduction .............................................................................................................1 2. About GATE 2014 ......................................................................................................1 2.1. Financial Assistance ............................................................................................................................ 1 2.2 Employment ............................................................................................................................................ 2 2.3 Administration ....................................................................................................................................... 2 3.1 Changes Introduced in GATE 2013 that will continue to remain in force for GATE 2014 .......................................................................................................................................................... 3 4.1 Eligibility for GATE 2014 ................................................................................................................... 4 4.2 GATE Papers ............................................................................................................................................ 5 4.3 Zone-Wise List of Cities in which GATE 2014 will be Held ................................................... 6 4.4 Zone-Wise List of Cities for 3rd...
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