Types of Modified Starch

Types of Modified Starch Native starches are structurally too weak and limited functions for application in pharmaceutical, food and non-food technologies due to its inherent weakness of hydration, swelling and structural organization. Unprocessed starches produce weak-bodied, cohesive rubbery pastes when cooked and undesirable gels when the pastes are cooled. To enhance viscosity, texture, stability among many desired functional properties desired, starch and their derivatives are modified by chemical, physical, and enzymatic methods. Modifications are necessary to create a range of functionality. Starch modification can be introduced by altering the structure and affecting the structure including the hydrogen bonding in a controlled manner to enhance and extend their application in industrial prospective. This modification includes esterification, etherification, cross linking, acid hydrolysis, enzymatic hydrolysis heat treatment and grafting of starch. Modified starches can be found applicable practices in food industry and non-food industry. Various types of modified starches for wide applications in many industries Pregelatinized starch It is the simplest starch modification, prepared by cooking. It maintains starch integrity while providing cold water thickening which   is a process that breaks down the intermolecular bonds of  starch  molecules in the presence of  water  and heat, allowing the  hydrogen bonding  sites (the hydroxyl hydrogen and oxygen) to engage more water. Cross-linked starch Cross linking is the most important modified form that used in the food industry. It involves replacement of hydrogen bond present between starch chains by stronger, permanent covalent bonds. Distarch phosphate or, adipate are commonly used in cross-linked starch. Cross-linked starches offer acid, heat and shear stability over the native starch. Food with this type of starch processing tends to have longer shelf life. Oxidized starch The processing includes reaction with oxidizing agent such as sodium hypochlorite or peroxide. This type of starch is mainly used as surface sizing agent or coating binder and available in different viscosity grade. Oxidized starches have shorter chain lengths than native starches. It improves whiteness and reduces microbiological content. Oxidized starches are the best thickener for applications requiring gels of low rigidity. This improves adhesion in batters and breading. Cationic starch Cationic starches are produced by reacting native starches with tertiary  or, quaternary amines, using wet or dry production processes. They are mainly used in  paper forming process. Cationic starch represents high performance starch derivatives widely used by paper manufactures to increase strength and retention. Cationic starches carry a formal positive charge over the entire pH range creating their affinity towards negatively charged substrates, such as cellulose, pulp and some synthetic fibres, aqueous suspensions of minerals and slimes and biologically active macromolecules. Cationic starch is also added at the beater to improve drainage on the wire, better sheet formation, and enhancement of the sizing efficiency of an alum-rosin size. Anionic starch Anionic starches are prepared by reaction with phosphoric acid and  alkali metal phosphates or by making derivative with carboxymethyl group. Thinned starch These are produced through depolymerisation reaction by hydrochloric acid or other acids. Unmodified starches are treated with a mineral acid at temperature lower than gelatinization and results in partially hydrolyzed starch molecules. This cleaves the chain length and lower viscosity. It increases the tendency to retro gradation. The lower viscosity permits higher concentrations to be used forming rigid gels in gums pastilles and jellies. In these applications, increased set-back leading to the formation of strong gels gives these starches significant advantages over native starches. Extended applications in food industry are found by acid-thinned starch in conjunction with esterification and etherification reaction. Acetylated starch Acetylated starch (E1420)  esterification  with  acetic anhydride Starch after treatment with acetic anhydride produces starch esters which are useful in biodegradable applications. In particular, high starch acetates provide thermo plasticity, hydrophobicity and compatibility with other additives. The result of this treatment is a stability starch which will produce pastes that will withstand several freeze-thaw cycles and prevent syneresis (weeping) occurs. Wide applications are in foods as texturing agent and provide good freeze-thaw stability. Extended applications in food industry are found by acetylated starch in conjunction with cross-linked starch. Dextrin Dextrin  (E1400) is formed by  roasting the starch with  hydrochloric acid. Dextrination is the heating of powdered starch, mostly in the presence of small amounts of acids, at different temperatures and with different reaction times. Dextrin is used as adhesives in paper and textile based industry. Grafted starch Grafted starches are produced by free radical copolymerization with ethylenically unsaturated monomers. Starch grafted with synthetic polymers is most utilized   tarches from different botanical origins were grafted with 1, 3 butadiene, styrene, acrylamide, acrylonitrile and Meth acrylic acid using free redox reaction. Starch ethers Starch ethers are produced by a nucleophilic substitution reaction with an ethylenically unsaturated monomer, followed by acid-catalyzed hydrolysis for viscosity adjustment. Physically modified starch Native starch can be modified with mechanical treatment, using spray drying technique, annealing technique Enzyme modified starch Enzyme-treated starch which includes maltodextrin,  cyclodextrin Starch modified with amylase enzyme produces derivative with good adhesion property and mainly used in coating the food with colorant. APPLICATION IN FOOD INDUSTRY Frozen Food To stabilize the food products starches are used in frozen bottle foods to provide freeze-thaw stability and retrogradation. Flavor Encapsulation Modified starches are used to encapsulate or, preserve the flavour of the food products. Octenylsuccinylated derivatives and other starch hydrolyzates are used as flavour encapsulation. Dairy Products Modified starches are used in a wider way to the dairy products; it provides variety of effects, including enhanced viscosity, cut ability, mouth feel and stability. In puddings, starch is used to enhance viscosity and smoothness. Starches are used in yogurts and sour cream to control syneresis and enhance thickness. Canned Food Canning process preserves food for up to several years by achieving a temperature sufficient to destroy or inactivate food poisoning or spoilage microbes. Starch is most commonly used to thicken, stabilize and enhance the mouth feel of canned foods such as puddings, pie- fillings, soups, sauces and gravies. Highly cross-linked starches are used for this purpose.

Sex Change

The issue of sex (besides being a national obsession) is reasonably interesting from a psycoanalytic and existential perspective. A lot of what drives us is sexual energy (in line with what Freud told us). This so-called energy isn't explicit, but if you stop to think about questions like â€Å"Why am I here? † the â€Å"I† refers to you as a being and your sexuality is intimately tied with that. That â€Å"I† differs quite radically based on whether you are male or female. From a purely reductionist perspective, we are simply â€Å"ugly bags of mostly water† (to use a phrase from Star Trek) for our genes. The main reason we have sex is so our genes can last. The reason that there's sexual dimorphism (as opposed to having only females reproducing asexually) is so the gene pool can be enriched and it is thus capable of withstanding sudden changes in environment. This is actually the reason why there is sex in the first place, but having dimorphism means having a gene pool (thereby phenotype) that's more varied. The sociological perspective is somewhat interesting, but I think it's very irrelevant. In the end, the psychological (perhaps biological) dominates and therefore it it is the one I will consider. I have always wondered what it would be like to be female. I have wondered what it feels like to experience the menstrual cycle each month, to give birth, etc. My perception of what â€Å"I† consitutes would be radically different, I assume, notwithstanding the sociological consequences of becoming female. Human males and females are pretty different in their genetic makeup, given that an entire chromosome present in males is not present in females (and this doesn't even address the issue of expression). This brings us to the interesting fact that a lot of textbooks quote: chimpanzees and humans have DNA which is more than 99% identical. I wonder what the basis of their comparison is, but I digress†¦ A few decades ago, the above sort of thinking would've been mere speculation. Existentially speaking, we are prisoners of our bodies and this sucks. But we humans, being the creatures with superior intellect (yeah, right), have taken control of our environments and now it is possible to reasonably answer some of the questions I ask above in a physical sense. I read an article (parts of which are reproduced here without permission) about this dude who underwent a sex-change operation to be female because he wanted to be a lesbian. He was considered a womaniser, but he really identified with girls and expressed his sexuality by cross-dressing, etc. But after a while he began the process of change. He took females hormones—the most effective blend being premarin, derived from the urine of a pregnant mare—-to produce breasts, greater sub-surface fat, diminished muscle mass and less skin oil than a man normallly secretes. However, hormone treatments cannot shrink the Adam's apple, alter the hips, or raise the voice; male vocal chords are irreversibly developed by adolescence. He also underwent a lot of sartorial changes as well. Finally the irreversible operation known as â€Å"neo-colporrhaphy†, or â€Å"new vagina†, was performed on him. Contrary to popular myth, this two-and-a-half-hour surgery does not involve the penis being cut off. It is instead emptied of its spongy tissue and, like the finger of a rubber glove, turned inside out. The skin of the penis is gently pushed into a cavity formed by separating the lower abdominal muscle fibres, and this inside-out formation becomes the vaginal lining. The scrotum is used to create the frontal lips of the vagina; some of the skin at the base of the inverted penis can be surgically sculpted to look like a clitoris. Enough of the urethra is preserved from the penis to tunnel it under the tissue and place it in the female position. (There was a reasonable discussion during the Beer Social here regarding the logistics of such an operation—in particular the issue of providing lubrication was thought important. ) According to John Money, a professor emeritus at the Johns Hopkins University School of Medicine, who's an expert on this procedure (I can see a lot of demand for it): â€Å"The majority of transsexuals no longer have the spasmodic sensation that comes from squirting out semen. They have, instead, more of a spreading glow that is very satisfactory indeed. † This dude (now dudette) is also married with kids and they still call her â€Å"daddy†. She and her wife get along very well and they find the relationship physically very satisfying. While I share a lot of the philosophy that prompted him to become a transvestite, I doubt if I would undergo such an operation. Perhaps if technology advances so that it can be done in a â€Å"perfect† way, but approaches like this somehow don't grab me. This isn't the only way to go. If you're female, you might contemplate becoming male. I read a while ago about how a female had an operation to have a penis implant. Such physical moves seem very drastic to me, even given what I said earlier about sexual energy driving us. Is the artificial physical change necessary in order to experience a female (or male) existence? While the reason for contemplating what it is to be female is mostly curiousity, it might have to do with my nurture as well. It is said that transsexuals are unhappy with their identities and that they seek an out, but will a physical transformation help them? Shouldn't reconcilation of one's identity with one's self, and transcendence of that identity beyond societal norms, be enough? If you are Cartesian (and to some extent I am), it should be. Maybe Freud was completely off about the Oedipus complex—maybe it's something akin to the Penis Envy thing he proposed—there's some sort of a Vagina Envy among males. Thanks to modern science, this envy can be sated. The surgery costs about $11,000. If you include other plastic surgery such as a nose job and breast implants, the total cost is about $25,000. Now to raise some money†¦

Essay On No Child Left Behind Act - 1247 Words

In 2004, coinciding with the conclusion of President George W. Bush’s first term in office, United States Secretary of Education, Rod Paige, released an essay depicting the successes of his administration. Paige’s department spearheaded the initiative sparked by the No Child Left Behind Act, a set of policies enacted to reform education and provide students with an improved degree of learning more suited to the evolving job market. Paige brings light to the findings of his administration, presenting what he considers to be evidence explicitly showing the successful nature of these programs. Through numerous faults with his argumentation and reasoning, however, Paige’s opinion on the outcome of said policies is highly debatable. To judge†¦show more content†¦With standard grading processes on the school level, motivation for sufficient learning is advancement and graduation from that educational branch. Except in cases of completely deteriorated motivatio n from the student, typically culminating in said student dropping out on their own accord, this incentive to complete the curriculum typically maintains student motivation. The shortsightedness of such testing is the assumption of a unified degree of student motivation, especially at the high school level (Forte, 2010). Standardized tests administered to student at this age group are frequently low pressure and low stake. Because the tests pose far less consequence to the student, and motivation for students can occur on such a wide spectrum, test results become far less uniform than expected (Ryan, Ryan, Arbuthnot, Samuels, 2007). When applied to a common, realistic scenario, the model begins to break down. For example, an unmotivated student would characteristically perform poorly on a test. When the scores are returned, however, the school is still expected to facilitate this student’s learning in order to resolve the previous score, following the trend of school culpabi lity. Due to differing degrees of motivation, the test results therefore possess a significant potential for ambiguous validity, which subsequently requires filtering of test results to stabilize the statistics (Wise, Wise, Bhola, 2006). To filterShow MoreRelatedNo Child Left Behind Act Essay1166 Words   |  5 Pages1. Definition of the Policy The No Child Left Behind Act of 2001 (NCLB) signed into law by President George W. Bush on January 8, 2002, is a comprehensive overhaul of the federal governments requirements of state and local education systems (www.nclb.gov). It reauthorizes the Elementary and Secondary Education Act of 1965 and replaces the 1994 Improving Americas Schools Act. 2. General Background Information President Bush has made education his number one domestic priority (www.ed.gov). OnRead MoreEssay on The No Child Left Behind Act953 Words   |  4 Pagesare being left behind† (www.ed.gov). The â€Å"No Child Left Behind† Act expands the federal government’s role in elementary and secondary education. The NCLB act was enacted January 8, 2002, and has four reform principles to the act: Accountability, flexibility, Researched-based reforms and parental options. Accountability begins with informed parents, communities and elected leaders so we can work together to improve schools. The states will measure the progress by testing every child in grades 3Read MoreNo Child Left Behind Act Essay642 Words   |  3 PagesNo Child Left Behind Act Making the NCLB Act effective is quite a chore for the federal and state legislation. The positive influences for the act are quite controversial. Accountability standards are set and measured on a yearly basis by each individual state. The educator’s qualifications and standards are also state and federally mandated. Reading, math and writing are the key academic subjects that are measured. The goal is to close the gap among race, socioeconomic groups, and disabledRead MoreEssay On No Child Left Behind Act822 Words   |  4 Pagesof Nation at Risk in 1983, and the enactment of new federal law, the Elementary and Secondary Education Act (ESEA) by President Lyndon B Johnson in 1965 all emphasized or established high standards and accountability within the nation’s education system. In 2002, Congress amended ESEA into the No Child Left Behind Act (NCLB). This act reauthorized the Elementary and Secondary Education Act, affecting education from kindergarten through high school for over a decade. NCLB calls for increased accountabilityRead MoreNo Child Left Behind Act Essay1646 Words   |  7 Pages The No Child Left Behind Act was based on the Elementary Secondary Education Act of 1965. The act was established based on the promise of Thomas Jefferson to create a free public education system in Virginia (Hammond, Kohn, Meier, Sizer Wood, 2004). The act is now reauthorized as the No Child Left Behind Act of 2001. The purpose of the No Child Left Behind Act was to make sure that children were given a fair, quality education. The act set out to close the achievement gaps in educationRead MoreEssay On No Child Left Behind Act1303 Words   |  6 PagesNo Child Left Behind Children are the future of this world. In an ideal universe, every child would have the intelligence and skills to become a doctor or lawyer; instead, we live in a world in which intelligence and skills are, across the board, different and unique in every student. In an attempt to create a common ground of intelligence throughout all students, the Bush administration passed the No Child Left Behind Act. Under this act, expectations were created for schools to produce a specificRead MoreEssay on No Child Left Behind Act3562 Words   |  15 PagesThe No Child Left Behind Act Alexis Cross His 324 Dr. Stephan Law February 20, 2010 No Child Left Behind Outline: 1. Introduction a. What I will be writing about b. Why I chose my topic c. What will be covered 2. The NCLB Act d. How it came to be e. What was proposed f. How it has been enacted 3. The NCLB Act g. Arguments in favor of h. Arguments against 4. Statistics i. How the NCLB Act has had a positive impactRead More No Child Left Behind Act Essay1247 Words   |  5 Pages No Child Left Behind Act President Bush quoted, â€Å"Clearly, our children are our future†¦Too many of our neediest children are being left behind† (www.ed.gov). The â€Å"No Child Left Behind† Act expands the federal government’s role in elementary and secondary education. The NCLB emphasizes accountability and abiding by policies set by the federal government. This law sets strict requirements and deadlines for states to expand the scope and frequency of student testing, restore their accountabilityRead MoreEssay on The No Child Left Behind Act1440 Words   |  6 PagesInitiated in 2002, the No Child Left Behind Act (NCLB) of 2001 intended to prevent the academic failures of educational institutions and individual students, as well as bridge achievement gaps between students. This act supports the basic standards of education reform across America; desiring to improve the learning outcomes of America’s youth. No Child Left Behind has left many to criticize the outcomes of the Act itself. Questions have risen concerning the effectiveness of NCLB, as well as theRead MoreNo Child Left Behind Act Essay710 Words   |  3 PagesThe No Child Left Behind Act of 2001, President George W. Bushs education reform bill, was signed into law on Jan. 8, 2002. The No Child Left Behind Act says that states will develop and apply challenging academic standards in reading and math. It will also set annual progress objectives to make sure that all groups of students reach proficiency within 12 years. And the act also says that children will be tested annually in grades 3 through 8, in reading and math to measure their progress.

The Consolidation of Fidel Castro’s Power Between 1959...

Castro and his 26th of July Movement took over Cuba’s streets in January 1959. Though Castro’s charismatic and vibrant personality quickly won him astonishing support, he knew that he had to consolidate his political power by ensuring the trust of the population. The consolidation of Fidel Castro’s power between 1959 and1961 was more of a result of domestic issues rather than United States economic policies. In order, to consolidate power, it was known that the reminder of the revolutionary groups that were involved in the fight against Batista had to be quickly eliminated, so as not to challenge his political ambitions. The revolutionaries brought many of Batista’s prominent military and civilian leaders before trial which were†¦show more content†¦Castro was prepared to eliminate key members of the party for the sake of reinforcing his own power. Thus by July Castro had effectively taken over as leader of Cuba where the nationalist reformers of the government were replaced by his more radical colleagues for example Che Guevara replaced Felipe Pazos. Additionally, Castro argued that elections would interfere with the priorities of new Cuba i.e. full employment, expended health care, extended education and the need to create a new political consciousness among the people. (Leonard). Additionally, Castro’s introduction of land reforms led to an increased support among the Cuban masses whereby making him immensely popular. During the first nine months of 1959 an estimated 1,500 decrees, laws and edicts were enacted. The most change though came with the passing of the Agrarian Reform Act in May 1959 which stated all real estate holdings were restricted in size (1000 acres except for sugar, rice and livestock farms) and the land that exceeded the limits established by the government was nationalized. Most historians assert that this action increased Castro’s support by the masses thereby giving him power. However, Pà ©rez-Stable states