Preview
Preview

Test for Starch and Reducing Sugar Present in Apple and Pear Essay

No Works Cited
Length: 819 words (2.3 double-spaced pages)
Rating: Orange      
Open Document




- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Test for Starch and Reducing Sugar Present in Apple and Pear
Title: Quantitative test for starch and reducing sugar present in
apple and pear

Aim:
To find and compare the amount of starch and reducing sugars present
in apple and pear.

Principle:
In testing the amount of reducing sugars, the fruits had to be
grounded into juice. Since reducing sugars are soluble, the sugar
present in the fruit would dissolve into the juice. We can dilute and
control the volume of fruit juice when doing the test, hence it is
easier to compare the quantity of reducing sugar in the same amount of
apple and pear. To test for reducing sugars, Benedict’s solution is
used. Benedict’s solution contains blue copper (II) ions that reduce
to red copper (I) oxide precipitates when added to reducing sugars. By
comparing the amount of precipitate present at the end of the test, we
can find out which fruit contains more reducing sugars.

The independent variable in this test is apple juice and pear juice,
the dependent variable is the amount of red precipitate present at the
end of the test. The controlled variables are the volume and
concentration of fruit juices, the temperature of the water bath, the
time of boiling and the volume of Benedict’s solutions added.


Since starch is insoluble, the above method is not suitable to test
for the amount of starch present in the fruits. The fruits had to be
cut into same sizes. Iodine solution is used to find the amount of
starch. Iodine solution turns from reddish-brown to dark blue when it
meets starch.

Procedure:

Test for reducing sugar:
1. apple and pear were grounded...


... middle of paper ...


... the pear rusted in the
air, also the juices might be contaminated while squeezing with the
same filter paper (teabag). The concentration of reducing sugar then
might not be true for the whole fruit. Also, the degree of rusting in
apple and pear was not the same. Thus this might alter the result.
In the iodine test, the size of drops of iodine solution might be
different, thus the measurement might be incorrect.

Conclusion:
The apple was determined to contain a larger amount of reducing sugars
than the pear did.

Possible improvement:
Use a pipette for the transferal of solutions and juices to ensure
equal volume in both independent variables. Cut away the rusted
surface of the fruits before grounding them into juices. Use the same
dropper to add iodine droplets to the fruit, so as to minimize the
error.


Click the button above to view the complete essay, speech, term paper, or research paper

Need Writing Help?

Get feedback on grammar, clarity, concision and logic instantly.

Check your paper »







This essay is 100% guaranteed.


Title Length Color Rating  
Essay on Strategies for Overcoming Test Anxiety - Anxiety can be defined as a state of uneasiness and nervousness resulting from the fear of unknown or the anticipation of some threatening event or situation. It can also be taken as a generalized mood or condition of mind that results from some unidentifiable cause or stimulus that is supposed to bring on some negative outcomes of certain possible future event/s or to simplify the whole idea, one can say that anxiety is the feeling of being worried about what may / will happen. This restlessness or uneasiness of feeling leads to various psychological and physiological disorders such as loss of appetite, loss of sleep, headache, palpitation, sweating, trembling etc....   [tags: test and testing] 622 words
(1.8 pages)
Better Essays [preview]
Starch and the Glycemic Index Essay - Starch digestion generally occurs in the small intestine by the action of α-amylase, dextrinase, and glucoamylase in non-ruminant animals. Starch granules interact with other chemical components such as lipids and proteins adhered to starch in the endosperm after reaching the small intestine of mono-gastric animals. Chewing also makes a difference on starch digestibility, increases carbohydrate availability by reducing food structure. It also mixes food fragments with saliva and converts them into a well-lubricated semi-solid bolus form and helps to swallow food for effective digestion....   [tags: digestion, carbohydrates, glucose] 682 words
(1.9 pages)
Better Essays [preview]
Managing Organizational Structure at Apple Inc Essay - Introduction Apple Inc. was established by Steve Jobs and Steve Wozniak on April 1, 1976 as a computer designer, developer and seller company. However, the company shifted its focus from only personal computer to include other consumer electronics such as portable media player and mobile phone in 2007. Apple Inc becomes one of the most popular makers in its field since it seems that its popularity has increased according to a report on www.statista.com that Apple Inc’s products sales was generally increasing throughout the first quarter of 2006 to the first quarter of 2014....   [tags: Analysis of Apple]
:: 7 Works Cited
1512 words
(4.3 pages)
Powerful Essays [preview]
Strategic Management of Apple, Inc Essay - Introduction and Background Apple, Inc is a well known name in the computer technology world; Apple, Inc leads the computer industry in innovation thanks to the award winning desktop and notebook computer known as OS X operating system (Yoffie & Slind, 2008). This paper will focus on Apple Inc., strategic management and why is it critical to the success of the organization in meeting its goals and mission. It is therefore important to define strategic management, according to Certo, Peter & Ottensmeyer, (2005), strategic management is a continuous process that directs an organization to be appropriately suited to its internal and external environment....   [tags: Apple, Inc Analysis]
:: 3 Works Cited
1524 words
(4.4 pages)
Strong Essays [preview]
Apple Computers Essay - Apple Computers There are many things you could think of when you hear the word apple. For example, “an apple a day keeps the doctor away” or “the apple doesn’t fall far from the tree.” Yet if you said apple to most Americans they would think of the infamous APPLE Computers. The reason this is so, is because APPLE Computers has changed history, present and the future in America. There are three main reasons for the company becoming so remarkable. First is Steve Jobs and Steve Wozniack, second is the early days of APPLE Computers and third is modern day APPLE and its great effect on America....   [tags: Apple Cooperation] 1079 words
(3.1 pages)
Strong Essays [preview]
Essay about Apple's History - Apple’s History In almost every part of the world Apple and at least one of their products is known. The Apple brand started in the 1970s. Three men founded the organization in 1976, to produce a computer that every citizen could use personally (Sohail, 2010). The first item released was the Apple 1 personal computer kit made by Steve Wozniak (Sohail, 2010). Through the 70s, Apple concentrated on developing storing technologies such as the floppy disk and the use of color, graphics, and spreadsheets used for business (Sohail, 2010)....   [tags: Technology, Apple's Powerbook] 1144 words
(3.3 pages)
Good Essays [preview]
Experiment of Starch Mixed with Amylase Essay - Experiment of Starch Mixed with Amylase Planning Aim: The aim of this experiment is to learn what happens when starch is mixed with amylase. I also intend to investigate the effects of changing one or more of the variables involved in the experiment. Key Factors: Listed below are each of the key factors featured in the experiment and the affect that each one may have upon the investigation… Temperature: The temperature of the room when the experiment is being carried out will determine the rate at which the amylase works since amylase is most efficient at body temperature, which is between 37-40°C, and less effective in more extreme conditions....   [tags: Papers] 1882 words
(5.4 pages)
Powerful Essays [preview]
Apple Iphone Essay - Introduction: With the very high demand in the market place for a musical device called the IPod, it’s no surprise that the IPhone, a hybrid of a phone and music device that it will be a big hit in the market place. This highly anticipated electronic trend setter had thousands of people waiting in line at the apple store in New York, and all over the country trying to get their hands on this iPhone. The IPod combined with a Phone, gives birth to this amazing product which has the following features: a 3.5 inch touch screen (the largest of all smart phones), Wi-Fi connectivity, the most usage time of all smart phones, i.e....   [tags: Technology Smart Phone Apple] 1754 words
(5 pages)
Powerful Essays [preview]
Apple Inc. Essay - Apple Inc. I am going to start off by going into a little bit of history about apple and how it has grown over the past 10 years or so, I am also going to talk about some new products from Apple such as Apple TV and the iphone, as well as the name change, and the new direction they have chosen to take with their marketing and what it has helped them accomplish over the past couple of years. Apple Inc. has come a long way from what it used to be. The computer market has always been a PC based system being mainly pushed by the Microsoft software platform....   [tags: Macintosh Apple Business Analysis Strategy] 1184 words
(3.4 pages)
Good Essays [preview]
Apple's Ipod Essay - The organization that I will be discussing is Apple, and specifically its iPod products. Apple was incorporated in the state of California on January 3, 1977. The Corporation has many stores throughout the world, and its corporate offices are at Apple Computer, Inc. 1 Infinite Loop Cupertino, CA 95014. Mission Statement Apple’s Mission Statement is that, Apple ignited the personal computer revolution in the 1970s with the Apple II and reinvented the personal computer in the 1980s with the Macintosh....   [tags: Ipod Technology Research Paper Apple] 1047 words
(3 pages)
Strong Essays [preview]