• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

The aim of this practical is to investigate on the different amounts of Vitamin C in a variety of juices and research on how it is affected when stored in its natural state or diluted.

Extracts from this document...

Introduction

Which type of fruit juice provides the most Vitamin C? Aim The aim of this practical is to investigate on the different amounts of Vitamin C in a variety of juices and research on how it is affected when stored in its natural state or diluted. To enable this, a reasonable amount of fruit juices ( apple, black-currant, lemon and orange)where all added into pre-prepared wells as this will help us find out which of the fruit juices mentioned above contained the most vitamin C. This practical will help develop key practical skills and improve data representation. Introduction Vitamin C (Ascorbic Acid) is an essential nutrient found in fresh fruits or vegetables like: lemons, oranges broccoli and Brussels sprouts. Vitamin C acts as an anti-oxidant to prevent plaque in the blood vessels and ensures that the central nervous system is functioning properly. Vitamin C is one of the most essential nutrients required for the body to function properly as it aids the formation of collagen which holds connective tissues together. Although this experiment does not oppose to any unethical issues, some may state otherwise due to fair trade as fresh fruits were used to carry out the investigation so alternative sources (Juices with artificial flavours) ...read more.

Middle

Wash hands before and after practical. Correct disposal of bio-hazard material. * Health Avoid contact with any chemical substance you work with. Don't eat nor drink in the lab. * Ethics There are no causes for alarm Although some might claim otherwise Due to fair trade. Justifying the validity and reliability of the chosen method Repeats should be kept at a minimum and only repeated when necessary and students must familiarise themselves with the equipment before the start of every practical. Measurements taken should be accurate and students may cross-check with each other to avoid too many anomalous results. However, anomalous results should be investigated if they occur too frequently. Suitable apparatus and experimental procedures should be followed strictly to ensure valid results and precision and only the most precise equipment should be used to make the test fair and accurate. Results A table to show the area of colour change produced by solutions with varying vitamin C concentration % Vitamin C/% Area of the circle/cm Test 1 Area of the circle/cm Test 2 Area of the circle/cm Test 3 Area of the circle/cm Fruit juices Area of the circle/cm Test 1 Area of the circle/cm Test 2 Area of the circle/cm Test 3 Av. ...read more.

Conclusion

Other sources of error are lack of concentration and personal bias and lack of callipers meant that the results may not have been as precise and accurate. LIMITATIONS One of the most common factors was lack of time and callipers were not available so the numbers of repeats were limited. REDUCING ERRORS Extra care should be taken when using Vitamin C solution and callipers should be used when repeating the experiment as it would improve accuracy. 'Used' agar gel plate should be labelled clearly so they are not disposed off or used carelessly when a separate group is carrying out the same practical. CONCLUSION In conclusion, the overall results disagree with the prediction that orange juice contains the most Vitamin C. This was due to the lemon juice been proven to contain the most vitamin C since it provided the most results when the Vitamin C solution was added to it and also lemon juice is most known for its medicinal purposes. IMPROVEMENTS Callipers will improve accuracy and also more repeats carried out in the practical will ensure reliability and the students would have more time to cross-check every measurement. FUTHERWORK It would be necessary to carry out the experiment using 2%of Vitamin C solution and also to repeat the 2nd and 3rd trials carried out earlier to produce more accurate results. RESOURCES As Salter's' Nuffield Biology www.course-workinfo.co.uk www.ummm.edu/altmed/articles/vitamin C-0003339.htm ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Molecules & Cells section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Molecules & Cells essays

  1. Marked by a teacher

    Analysing the vitamin C content in different fruit juices

    5 star(s)

    Vitamin C content in fruit The best readily available vitamin C source in fruit is kiwifruit. Fruits like orange are the most renown source of vitamin C. Freshly squeezed orange juice contains 26% of vitamin C. Fruit juice can provide up to 33% of the vitamin in children?s diet.

  2. Marked by a teacher

    Beetroot Practical Write up

    3 star(s)

    The cell membrane encloses some of the fluid and pinches off to form a vesicle. As the vesicle is closed off the materials are dispersed in the cell, which is referred to as assimilation. Exocytosis: Vesicles budded off from the Golgi apparatus or endoplasmic reticulum can fuse with the cell membrane, expelling their contents.

  1. Marked by a teacher

    Vitamin C content of fruit juices

    3 star(s)

    Vitamin C also plays a vital role in detoxification, aids ferum absorption and improves resistance to infection. As all other vitamins, the human body only requires vitamin C in relatively small quantities as compared to macronutrients such as carbohydrates, proteins and lipids.

  2. Marked by a teacher

    Vitamin C. Core Practical. Throughout this investigation we will aim to find whether ...

    3 star(s)

    and is only made worse by producers lying about the amount of nutrients in the product and might possibly lead to people suffering a malnutrition of vitamin C. Aims of this practical: The aim of this investigation is to investigate the vitamin c contents, in different fruit juices.

  1. Peer reviewed

    Determination of Vitamin C in food

    4 star(s)

    However as the concentration of iodine and triiodide increases the reaction between starch molecules is relatively strong and becomes less reversible. Method The method was carried out as described in the NEC handout Apparatus As described in the NEC handout Risk assessment There are several risks associated with this experiment

  2. To investigate how temperature affects the concentration of vitamin C in orange juice (specifically ...

    That is called a disc herniation. If this squished-out material touches a nerve in your spinal column, it causes pain and usually a lot of it. Adequate Vitamin C will toughen up the outside portion of the disc and a herniation is much less likely. Immune System Vitamin C is required for the proper functioning of our immune systems.

  1. Catalyse Investigation

    When a measuring cylinder was used, care was taken to accurately align the base of the meniscus with the graduations on the scale. The digestion of sucrose produces glucose and fructose. Glucose is a reducing sugar and will reduce an acidified purple-pink solution of potassium manganate (vii)

  2. In my experiment I will discover how much vitamin C there is in fruit ...

    The fresh fruits will have more vitamin C content than the juices because Vitamin C can be very easily Oxidised and the fruit juices will have been in contact with Oxygen for longer than the fresh fruits. Other factors such as additional ingredients in the fruit juices may deplete the content of vitamin C.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work