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Does Hand Sanitizer kill germs?

BY: Clarissa Torres

D'Youville College Math and Natural Sciences

Biology lab 101

Research answers of the use of Hand Sanitizer

Hypothesis of the experiment

  • All hand sanitizers have at least 66.6% alcohol in it.

  • kills microbial cells (reduce germs)

  • It reduces the spread of colds and illnesses

  • Since Hand Sanitizer is used without water, it does not remove dirt from hands

  • A method for hand hygiene
  • Less skin irritation

66.6% of the germs in the hands will be affected.

(Hypothesis was determined by the study of Dr.Sally Bloomfield.)

In the experimental there were three species found , and in the control there was only one species.

The species reduced!!

Does Hand Sanitizer really kill germs?

Experimental

Reduction of species

Results

germs were

Control

Black Sharpie

1 species

After hand sanitizer

Experimental

Table

Light growth ( it has less than 20 species)

Before hand sanitizer

3 species

Control

Petri agar dishes

Sterile cotton swab stick

To conduct the experiment

Things needed

Hand

What is known

*It is a solution that is anti-bacterial

*Hand Sanitizer is known to kill germs on people hands.

*It is a faster and easier way to clean hand

*Water or soap is not needed *Alcohol

Many Manufacturers indicate that hand sanitizers kill 99.99% of anti-bacterial germs

Hand Sanitizer

Two strips of Para film

Experiment

Step 1- Retrieve a sample of the unwash hand

When taking the sample, the swab stick was placed around the fingers and palm of the hand.

Step 2- Place the sample in the dish

Zigzag form

Step 3- Place the hand sanitizer in the hand and massage the hand sanitizer until hands feel dry.

Step 4- Take a sample of the hand and

place in the dish.

(ZigZag Form)

Did the hand sanitizer work?

Not all bacteria are killed because some bacteria is needed in the human body. To fight off diseases.

*The results support the Hypothesis

Control= 3 species

Experiment= 1 species

66.6% of the control species reduced as resulted on the experimental

Studies that proved this experiment wrong

Manufacturers indicate ALL hand sanitizers kill 99.9% of bacteria (Purell)

Research indicates that 99.9% of harmful germs are killed ( these germs spread illnesses)

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