DETECTION OF BISPHENOL A ON DIFFERENT TYPES OF CANS.

DETECTION OF BISPHENOL A ON DIFFERENT TYPES OF CANS

This study determined which of the commonly bought cans of preserved foods, liquid milk and powdered milk in Iligan City contain a chemical substance called Bisphenol A.

What was the study all about?

If there is presence of Bisphenol A among commonly bought cans of preserved foods, liquid milk and powdered milk in Iligan City.

Main Problem

Which part of the cans (inside, inner base, outside) mostly contain BPA?

Which brand(s) among the seven different samples contain(s) BPA?

Is there any difference between the BPA content in the different parts of the cans?

Sub-problems

The study only focused on detection of Bisphenol A on cans of preserved foods, liquid milk and powdered milk which are commonly bought here in Iligan City using an indicator solution composed of distilled water and iron (III) chloride only.

Scope of the Study

What were the procedures done?

1. Preparation of materials

7. Drying the swab for 10 mins

2. Preparation of the indicator solution

3. Boiling of water for 10 mins

4.Submerged the can

for 5 mins

5. Swabbing the can

6. Applying the indicator

PREPARATION OF MATERIALS

PREPARATION OF THE INDICATOR SOLUTION

Boiling of water and submerging a can

Swabbing the can

Applying the indicator

Results of the Experimentation

Powdered Milk Cans

SAMPLE CANS

COLOR CHANGE

INSIDEINNER

BASEOUTSIDE

Nido None None None

NAN Pro 3 None None None

AnchorBrownish

redBrownish

redNone

For Nido, there was no color change on the swab for the inside, bottom, and outside part of the can, implicating absence of BPA on the can.

For Nan Pro 3, there was no color change on the swab on the inside, base, and outside part of the can, implicating absence of BPA on the can.

For Anchor, brownish red appeared on the swab for the inside, bottom part, and no color change on the outside part of the can, indicating presence of BPA on the inside and bottom part of the can and no presence of BPA on the outside part of the can.

SAMPLE CANS

COLOR CHANGE

INSIDEINNER BASE

OUTSIDE

Daisy Bluish Spot Dark blue None

Cowbell None Grayish Blue None

Dairy Champ Dark Orange Dark OrangeDark

Orange

Condensed Milk Cans

For Daisy, bluish and dark blue appeared on the swab rubbed on the inside and outside part of the can and no color change on the swab rubbed in the inner bottom of the can, implying presence of BPA on inner and outside part of the can and absence of BPA on the inner bottom part of the can.

For Cowbell, there was no color change on the swab rubbed on the inside, and base part of the can and grayish blue appeared on the swab rubbed on the outside part of the can showing absence of BPA on the inside and bottom part of the can and on the outside part, there was BPA presence.

For Dairy Champ, dark orange appeared on the three locations of the can implying presence of BPA on the can.

Evaporated Milk Cans

SAMPLE CANS

COLOR CHANGE

INSIDEINNER BASE

OUTSIDE

Alaska None None None

Carnation None NoneGrayish

Blue

Alpine None NoneGrayish

Blue

For Alaska, there was no color change on the swab on the inside, bottom, and outside part of the can, implying absence of BPA on the can.

For Carnation, there was no color change on the swab on the inside, and base part of the can and grayish blue appeared on the swab rubbed on the outside part of the can, showing absence of BPA on the inside and bottom part of the can and on the outside part, there was BPA presence.

For Alpine, there was no color change on the swab on the inside and base part of the can and grayish blue appeared on the swab rubbed in the outside part of the can, implicating no presence of BPA on the inside and base part of the can and on the outside part, there was BPA presence.

Corned Beef Cans

SAMPLE CANSCOLOR CHANGE

INSIDEINNER

BASEOUTSIDE

CDO None Red None

Argentina None None None

Holiday None NoneGrayish

Blue

For CDO, there was no color change on the swab on the inside, bottom, and outside part of the can, implying no presence of BPA on the can.

For Argentina, there was no color change on the swab on the inside, base, and outside part of the can, implicating no presence of BPA on the can.

For Holiday, there was no color change occurred on the swab on the inside, and bottom part of the can and grayish blue appeared on the swab exposed to the outside part of the can, implicating no presence of BPA on the inside and bottom part of the can and on the outside part, there was BPA presence.

Beef Loaf Cans

SAMPLE CANS

COLOR CHANGE

INSIDEINNER

BASEOUTSIDE

El Rancho None NoneGrayish

Blue

Bingo None None None

Winner Red Spots None Red Spots

For El Rancho, there was no color change on the swab on the inside and bottom part of the can and grayish blue appeared on the swab rubbed on the outside part of the can, implying absence of BPA on the inside and bottom part of the can and on the outside part, there was BPA presence.

For Bingo, no color change occurred on the swab on the inside, base, and outside part of the can, indicating no presence of BPA on the can.

For Winner, red spots appeared on the swab on the inside and outside part of the can and no color change occurred on the swab on the base part of the can, implicating presence of BPA on the inside and outside part of the can and on the base part, there was no BPA presence.

Sardines Cans

SAMPLE CANS

COLOR CHANGE

INSIDEINNER

BASEOUTSIDE

Mega None None None

Youngstown

Blue Spots Blue Spots None

UniPak None None None

For Mega, no color change occurred on the swab on the inside, base, and outside part of the can, implicating absence of BPA on the can.

For Youngstown, there was no color change on the swab on the outside part of the can and blue spots appeared on the swab exposed to the inside and base part of the can, indicating that no BPA was present on the outside of the can and there was presence of BPA on the inside and base part of the can.

For Unipak, there was no color change on the swab on the inside, base, and outside part of the can, implicating absence of BPA on the can.

Tuna

SAMPLE CANS

COLOR CHANGE

INSIDEINNER

BASEOUTSIDE

555Reddish

brownReddish

BrownReddish

Brown

Bluebay None NoneReddish

Orange

Century Bluish Spots NoneBluish

Spots

For 555, reddish brown appeared on the swab rubbed in the three locations of the can, implying presence of BPA on the can.

For Bluebay, there was no color change on the swab on the inside and inner base part of the can and reddish orange appeared on the swab rubbed on the outside part, indicating that no BPA was present on the inside and inner base and there was presence of BPA on the outside part of the can.

For Century, there was no color change on the swab on base part of the can and bluish spots appeared on the inside and outside of the can, implicating absence of BPA on the base and presence of BPA on the base inside the can.

Comparison of the different results between the different parts

Based on the results gathered by the researchers, nine out of 21 of the brands showed a color change on the swab rubbed in the inner part of the cans. Five out of 21showed a color change on the swab rubbed in the base inside the cans. And 12 out of 21 showed a color change on the swab rubbed in the outside part of the cans.

Conclusions

Among the different brands in powdered-milk can, Anchor contains BPA.

In condensed milk cans, Dairy Champ and Daisy contain BPA. In evaporated milk cans, Carnation and Alpine contain BPA. In corned beef cans, CDO and Holiday contain BPA. In Beef Loaf cans, El rancho and Winner contain BPA. In sardines cans, only Youngstown cantains BPA. In tuna cans, all of them, 555, Bluebay and Century contain

BPA. There is a difference between the BPA content in the different

parts of the cans. The outside part mostly contains BPA, then the inside part, and the inner bottom which contains the least.

The use of other indicator aside from Iron (III) Chloride.

Use of other experimental subjects aside from cans.

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