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Science - Biochemistry 1B - Lab Reports Library Support: EXPERIMENT: Chromatography

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Protocols from Experiments (SpringerLink)

• Protocol: Arabidopsis thaliana Polar Glycerolipid Profiling by Thin Layer Chromatography (TLC) Coupled with Gas-Liquid Chromatography (GLC) (JoVE) Video and protocol from the Experiment

JoVE Video Experiment

JoVE Video Experiment: Thin Layer Chromatography

Thin Layer Chromatography PRINT Books

Thin Layer Chromatography ONLINE Books

Terms definitions from Dictionaries and Encyclopedias (Online)

• Chromatography (Definition, SpringerLink)
• THIN-LAYER CHROMATOGRAPHY | Overview (Science Direct)

TLC Book Chapters ONLINE

• Thin Layer Chromatography Suggested Chapters - (ScienceDirect; Full-text
• High Performance Thin-Layer Chromatography (Chapter; SpringerLink)

Top Databases to search for articles

Selected articles for: thin layer chromatography and pigments.

• Article: Separation of plant pigments by thin layer chromatography (ACS)
• Article: TLC separation of ink pigments (ACS)
• Thin, layer chromatographic method for determining plant pigments..... For Referencing: Geochemical Journal, 5:23-37, 1971
• Selected articles for TLC: Thin Layer Chromatography Click on the link to view articles on TLC. Select the "PDF" next to the title on the right side
• Article: Small-Scale Thin-Layer Chromatography: Experiments for teaching purposes For Referencing: Brinkman, U.A.Th. and De Vries, G.(1972). Small-Scale Thin-Layer Chromatography: Experiments for teaching purposes. Journol of Chemicol Fducofion, 49(8):545-546
• Article: A thin-layer chromatography experiment for general chemistry For Referencing: Lines, J.G., Shellard, E.J., Stahl, E. et al. (1964). Thin-layer chromatography. Proc. Soc. Anal. Chem, 1:118-124

Selected Articles for Thin Layer Chromatography

• Thin layer chromatography apparatus (ACS article) For Referencing: Elizabeth Hansbury D. G. OttJ. D. Perrings J. Chem. Educ., 1963, 40(1):31
• Instrumentation for thin-layer chromatography For Referencing: Peter F. LottRobert J. Hurtubise J. Chem. Educ., 1971, 48(7): A437
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Leaf chromatography

In association with Nuffield Foundation

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Try this class practical using paper chromatography to separate and investigate the pigments in a leaf

Most leaves are green due to chlorophyll. This substance is important in photosynthesis (the process by which plants make their food). In this experiment, students investigate the different pigments present in a leaf, from chlorophyll to carotenes, using paper chromatography.

The experiment takes about 30 minutes and can be carried out in groups of two or three students.

• Eye protection
• Pestle and mortar
• Chromatography paper
• Beaker, 100 cm 3
• Small capillary tube (see note 1)
• Cut-up leaves, or leaves and scissors (see note 2)
• Propanone (HIGHLY FLAMMABLE, IRRITANT), supplied in a small bottle fitted with a teat pipette (see note 3)

Equipment notes

• The capillary tubing can be ‘home-made’ from lengths of ordinary glass tubing (diameter: 3–4 mm) using a Bunsen burner fitted with a flame-spreading (‘fish-tail’) jet.
• A variety of leaves can be used. Best results are obtained from trees or bushes with dark green leaves, eg holly.
• Preferably use teat pipettes that do not allow squirting, eg those fitted to dropper bottles of universal indicator.

Health, safety and technical notes

• Read our standard health and safety guidance.
• Wear eye protection throughout.
• Propanone, CH 3 COCH 3 (l), (HIGHLY FLAMMABLE, IRRITANT) – see CLEAPSS Hazcard HC085A .  The vapour of propanone is HIGHLY FLAMMABLE. Do not have any source of ignition nearby.
• Finely cut up some leaves and fill a mortar to about 2 cm depth.
• Add a pinch of sand and about six drops of propanone from the teat pipette.
• Grind the mixture with a pestle for at least three minutes.
• On a strip of chromatography paper, draw a pencil line 3 cm from the bottom.
• Use a fine glass tube to put liquid from the leaf extract onto the centre of the line. Keep the spot as small as possible.
• Allow the spot to dry, then add another spot on top. Add five more drops of solution, letting each one dry before putting on the next. The idea is to build up a very concentrated small spot on the paper.
• Attach the paper to the pencil using sellotape so that when placed in the beaker, the paper is just clear of its base.
• Place no more than about 10 cm 3 of propanone in the beaker and hang the paper so it dips in the propanone. Ensure the propanone level is below the spot.

Source: Royal Society of Chemistry

The equipment required for using paper chromatography to separate the different pigments in leaves

• Avoid moving the beaker in any way once the chromatography has started.
• Leave the experiment until the propanone has soaked near to the top, and then remove the paper from the beaker.
• Mark how high the propanone gets on the paper with a pencil and let the chromatogram dry.

Teaching notes

This experiment works very well providing care is taken over preparing the spot on the chromatography paper. It should be as small and as concentrated as possible. Encourage students to be patient and to wait until each application is dry before adding the next.

At least three spots should be obtained, and one of these should be yellow due to carotenes.

The extent to which any particular component moves up the paper is dependent not only on its solubility in propanone but also on its attraction for the cellulose in the chromatography paper. The yellow carotene spot (with a higher RF value) tends to move up the paper the furthest.

More resources

Add context and inspire your learners with our short career videos showing how chemistry is making a difference .

Additional information

This is a resource from the  Practical Chemistry project , developed by the Nuffield Foundation and the Royal Society of Chemistry.

Practical Chemistry activities accompany  Practical Physics  and  Practical Biology .

© Nuffield Foundation and the Royal Society of Chemistry

• 11-14 years
• 14-16 years
• Practical experiments
• Chromatography

Specification

• 2. Develop and use models to describe the nature of matter; demonstrate how they provide a simple way to to account for the conservation of mass, changes of state, physical change, chemical change, mixtures, and their separation.
• Chromatography as a separation technique in which a mobile phase carrying a mixture is caused to move in contact with a selectively absorbent stationary phase.
• 6 Investigate how paper chromatography can be used to separate and tell the difference between coloured substances. Students should calculate Rf values.
• Chromatography involves a stationary phase and a mobile phase. Separation depends on the distribution of substances between the phases.
• The ratio of the distance moved by a compound (centre of spot from origin) to the distance moved by the solvent can be expressed as its Rf value: Rf = (distance moved by substance / distance moved by solvent)
• Mixtures can be separated by physical processes such as filtration, crystallisation, simple distillation, fractional distillation and chromatography. These physical processes do not involve chemical reactions and no new substances are made.
• Recall that chromatography involves a stationary and a mobile phase and that separation depends on the distribution between the phases.
• Interpret chromatograms, including measuring Rf values.
• Suggest chromatographic methods for distinguishing pure from impure substances.
• 12 Investigate how paper chromatography can be used to separate and tell the difference between coloured substances. Students should calculate Rf values.
• 2.11 Investigate the composition of inks using simple distillation and paper chromatography
• 2.9 Describe paper chromatography as the separation of mixtures of soluble substances by running a solvent (mobile phase) through the mixture on the paper (the paper contains the stationary phase), which causes the substances to move at different rates…
• C2.1g describe the techniques of paper and thin layer chromatography
• 2.9 Describe paper chromatography as the separation of mixtures of soluble substances by running a solvent (mobile phase) through the mixture on the paper (the paper contains the stationary phase), which causes the substances to move at different rates o…
• C5.1.4 recall that chromatography involves a stationary and a mobile phase and that separation depends on the distribution between the phases
• 3 Using chromatography to identify mixtures of dyes in a sample of an unknown composition
• C3 Using chromatography to identify mixtures of dyes in a sample of an unknown composition
• 1.9.5 investigate practically how mixtures can be separated using filtration, crystallisation, paper chromatography, simple distillation or fractional distillation (including using fractional distillation in the laboratory to separate miscible liquids…
• 1.9.7 interpret a paper chromatogram including calculating Rf values;
• carry out paper and thin-layer chromatography and measure the Rf values of the components and interpret the chromatograms;

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How To Write A Lab Report | Step-by-Step Guide & Examples

Published on May 20, 2021 by Pritha Bhandari . Revised on July 23, 2023.

A lab report conveys the aim, methods, results, and conclusions of a scientific experiment. The main purpose of a lab report is to demonstrate your understanding of the scientific method by performing and evaluating a hands-on lab experiment. This type of assignment is usually shorter than a research paper .

Lab reports are commonly used in science, technology, engineering, and mathematics (STEM) fields. This article focuses on how to structure and write a lab report.

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Table of contents

Structuring a lab report, introduction, other interesting articles, frequently asked questions about lab reports.

The sections of a lab report can vary between scientific fields and course requirements, but they usually contain the purpose, methods, and findings of a lab experiment .

Each section of a lab report has its own purpose.

• Title: expresses the topic of your study
• Abstract : summarizes your research aims, methods, results, and conclusions
• Introduction: establishes the context needed to understand the topic
• Method: describes the materials and procedures used in the experiment
• Results: reports all descriptive and inferential statistical analyses
• Discussion: interprets and evaluates results and identifies limitations
• Conclusion: sums up the main findings of your experiment
• References: list of all sources cited using a specific style (e.g. APA )
• Appendices : contains lengthy materials, procedures, tables or figures

Although most lab reports contain these sections, some sections can be omitted or combined with others. For example, some lab reports contain a brief section on research aims instead of an introduction, and a separate conclusion is not always required.

If you’re not sure, it’s best to check your lab report requirements with your instructor.

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Your title provides the first impression of your lab report – effective titles communicate the topic and/or the findings of your study in specific terms.

Create a title that directly conveys the main focus or purpose of your study. It doesn’t need to be creative or thought-provoking, but it should be informative.

• The effects of varying nitrogen levels on tomato plant height.
• Testing the universality of the McGurk effect.
• Comparing the viscosity of common liquids found in kitchens.

An abstract condenses a lab report into a brief overview of about 150–300 words. It should provide readers with a compact version of the research aims, the methods and materials used, the main results, and the final conclusion.

Think of it as a way of giving readers a preview of your full lab report. Write the abstract last, in the past tense, after you’ve drafted all the other sections of your report, so you’ll be able to succinctly summarize each section.

To write a lab report abstract, use these guiding questions:

• What is the wider context of your study?
• What research question were you trying to answer?
• How did you perform the experiment?
• What did your results show?
• How did you interpret your results?
• What is the importance of your findings?

Nitrogen is a necessary nutrient for high quality plants. Tomatoes, one of the most consumed fruits worldwide, rely on nitrogen for healthy leaves and stems to grow fruit. This experiment tested whether nitrogen levels affected tomato plant height in a controlled setting. It was expected that higher levels of nitrogen fertilizer would yield taller tomato plants.

Levels of nitrogen fertilizer were varied between three groups of tomato plants. The control group did not receive any nitrogen fertilizer, while one experimental group received low levels of nitrogen fertilizer, and a second experimental group received high levels of nitrogen fertilizer. All plants were grown from seeds, and heights were measured 50 days into the experiment.

The effects of nitrogen levels on plant height were tested between groups using an ANOVA. The plants with the highest level of nitrogen fertilizer were the tallest, while the plants with low levels of nitrogen exceeded the control group plants in height. In line with expectations and previous findings, the effects of nitrogen levels on plant height were statistically significant. This study strengthens the importance of nitrogen for tomato plants.

Your lab report introduction should set the scene for your experiment. One way to write your introduction is with a funnel (an inverted triangle) structure:

• Start with the broad, general research topic
• Narrow your topic down your specific study focus
• End with a clear research question

Begin by providing background information on your research topic and explaining why it’s important in a broad real-world or theoretical context. Describe relevant previous research on your topic and note how your study may confirm it or expand it, or fill a gap in the research field.

This lab experiment builds on previous research from Haque, Paul, and Sarker (2011), who demonstrated that tomato plant yield increased at higher levels of nitrogen. However, the present research focuses on plant height as a growth indicator and uses a lab-controlled setting instead.

Next, go into detail on the theoretical basis for your study and describe any directly relevant laws or equations that you’ll be using. State your main research aims and expectations by outlining your hypotheses .

Based on the importance of nitrogen for tomato plants, the primary hypothesis was that the plants with the high levels of nitrogen would grow the tallest. The secondary hypothesis was that plants with low levels of nitrogen would grow taller than plants with no nitrogen.

Your introduction doesn’t need to be long, but you may need to organize it into a few paragraphs or with subheadings such as “Research Context” or “Research Aims.”

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A lab report Method section details the steps you took to gather and analyze data. Give enough detail so that others can follow or evaluate your procedures. Write this section in the past tense. If you need to include any long lists of procedural steps or materials, place them in the Appendices section but refer to them in the text here.

You should describe your experimental design, your subjects, materials, and specific procedures used for data collection and analysis.

Experimental design

Briefly note whether your experiment is a within-subjects  or between-subjects design, and describe how your sample units were assigned to conditions if relevant.

A between-subjects design with three groups of tomato plants was used. The control group did not receive any nitrogen fertilizer. The first experimental group received a low level of nitrogen fertilizer, while the second experimental group received a high level of nitrogen fertilizer.

Describe human subjects in terms of demographic characteristics, and animal or plant subjects in terms of genetic background. Note the total number of subjects as well as the number of subjects per condition or per group. You should also state how you recruited subjects for your study.

List the equipment or materials you used to gather data and state the model names for any specialized equipment.

List of materials

35 Tomato seeds

15 plant pots (15 cm tall)

Light lamps (50,000 lux)

Nitrogen fertilizer

Measuring tape

Describe your experimental settings and conditions in detail. You can provide labelled diagrams or images of the exact set-up necessary for experimental equipment. State how extraneous variables were controlled through restriction or by fixing them at a certain level (e.g., keeping the lab at room temperature).

Light levels were fixed throughout the experiment, and the plants were exposed to 12 hours of light a day. Temperature was restricted to between 23 and 25℃. The pH and carbon levels of the soil were also held constant throughout the experiment as these variables could influence plant height. The plants were grown in rooms free of insects or other pests, and they were spaced out adequately.

Your experimental procedure should describe the exact steps you took to gather data in chronological order. You’ll need to provide enough information so that someone else can replicate your procedure, but you should also be concise. Place detailed information in the appendices where appropriate.

In a lab experiment, you’ll often closely follow a lab manual to gather data. Some instructors will allow you to simply reference the manual and state whether you changed any steps based on practical considerations. Other instructors may want you to rewrite the lab manual procedures as complete sentences in coherent paragraphs, while noting any changes to the steps that you applied in practice.

If you’re performing extensive data analysis, be sure to state your planned analysis methods as well. This includes the types of tests you’ll perform and any programs or software you’ll use for calculations (if relevant).

First, tomato seeds were sown in wooden flats containing soil about 2 cm below the surface. Each seed was kept 3-5 cm apart. The flats were covered to keep the soil moist until germination. The seedlings were removed and transplanted to pots 8 days later, with a maximum of 2 plants to a pot. Each pot was watered once a day to keep the soil moist.

The nitrogen fertilizer treatment was applied to the plant pots 12 days after transplantation. The control group received no treatment, while the first experimental group received a low concentration, and the second experimental group received a high concentration. There were 5 pots in each group, and each plant pot was labelled to indicate the group the plants belonged to.

50 days after the start of the experiment, plant height was measured for all plants. A measuring tape was used to record the length of the plant from ground level to the top of the tallest leaf.

In your results section, you should report the results of any statistical analysis procedures that you undertook. You should clearly state how the results of statistical tests support or refute your initial hypotheses.

The main results to report include:

• any descriptive statistics
• statistical test results
• the significance of the test results
• estimates of standard error or confidence intervals

The mean heights of the plants in the control group, low nitrogen group, and high nitrogen groups were 20.3, 25.1, and 29.6 cm respectively. A one-way ANOVA was applied to calculate the effect of nitrogen fertilizer level on plant height. The results demonstrated statistically significant ( p = .03) height differences between groups.

Next, post-hoc tests were performed to assess the primary and secondary hypotheses. In support of the primary hypothesis, the high nitrogen group plants were significantly taller than the low nitrogen group and the control group plants. Similarly, the results supported the secondary hypothesis: the low nitrogen plants were taller than the control group plants.

These results can be reported in the text or in tables and figures. Use text for highlighting a few key results, but present large sets of numbers in tables, or show relationships between variables with graphs.

You should also include sample calculations in the Results section for complex experiments. For each sample calculation, provide a brief description of what it does and use clear symbols. Present your raw data in the Appendices section and refer to it to highlight any outliers or trends.

The Discussion section will help demonstrate your understanding of the experimental process and your critical thinking skills.

In this section, you can:

• Interpret your results
• Compare your findings with your expectations
• Identify any sources of experimental error
• Explain any unexpected results
• Suggest possible improvements for further studies

Interpreting your results involves clarifying how your results help you answer your main research question. Report whether your results support your hypotheses.

• Did you measure what you sought out to measure?
• Were your analysis procedures appropriate for this type of data?

Compare your findings with other research and explain any key differences in findings.

• Are your results in line with those from previous studies or your classmates’ results? Why or why not?

An effective Discussion section will also highlight the strengths and limitations of a study.

• Did you have high internal validity or reliability?
• How did you establish these aspects of your study?

When describing limitations, use specific examples. For example, if random error contributed substantially to the measurements in your study, state the particular sources of error (e.g., imprecise apparatus) and explain ways to improve them.

The results support the hypothesis that nitrogen levels affect plant height, with increasing levels producing taller plants. These statistically significant results are taken together with previous research to support the importance of nitrogen as a nutrient for tomato plant growth.

However, unlike previous studies, this study focused on plant height as an indicator of plant growth in the present experiment. Importantly, plant height may not always reflect plant health or fruit yield, so measuring other indicators would have strengthened the study findings.

Another limitation of the study is the plant height measurement technique, as the measuring tape was not suitable for plants with extreme curvature. Future studies may focus on measuring plant height in different ways.

The main strengths of this study were the controls for extraneous variables, such as pH and carbon levels of the soil. All other factors that could affect plant height were tightly controlled to isolate the effects of nitrogen levels, resulting in high internal validity for this study.

Your conclusion should be the final section of your lab report. Here, you’ll summarize the findings of your experiment, with a brief overview of the strengths and limitations, and implications of your study for further research.

Some lab reports may omit a Conclusion section because it overlaps with the Discussion section, but you should check with your instructor before doing so.

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A lab report conveys the aim, methods, results, and conclusions of a scientific experiment . Lab reports are commonly assigned in science, technology, engineering, and mathematics (STEM) fields.

The purpose of a lab report is to demonstrate your understanding of the scientific method with a hands-on lab experiment. Course instructors will often provide you with an experimental design and procedure. Your task is to write up how you actually performed the experiment and evaluate the outcome.

In contrast, a research paper requires you to independently develop an original argument. It involves more in-depth research and interpretation of sources and data.

A lab report is usually shorter than a research paper.

The sections of a lab report can vary between scientific fields and course requirements, but it usually contains the following:

• Abstract: summarizes your research aims, methods, results, and conclusions
• References: list of all sources cited using a specific style (e.g. APA)
• Appendices: contains lengthy materials, procedures, tables or figures

The results chapter or section simply and objectively reports what you found, without speculating on why you found these results. The discussion interprets the meaning of the results, puts them in context, and explains why they matter.

In qualitative research , results and discussion are sometimes combined. But in quantitative research , it’s considered important to separate the objective results from your interpretation of them.

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