Presentation on theme: "A Study on the Potential Mutagenicity of Overcooked Hardboiled Eggs using Allium cepa test Russel Christine B. Corcino Germaine D. Arda."— Presentation transcript:
A Study on the Potential Mutagenicity of Overcooked Hardboiled Eggs using Allium cepa test Russel Christine B. Corcino Germaine D. Arda
Background of the Study Eggs Major part of the daily diet of humans Can be cooked in different ways (ex. Boiling) People may sometimes overcook eggs Generates hydrogen sulfide (H 2 S) harmful to the body Coagulates the structure of the egg People still consume overcooked eggs
Statement of the Problems 1.How long is the normal cooking time of an egg to be considered? 2.Is there a difference in the physical characteristics of an overcooked hardboiled egg and a normal cooked hardboiled egg? 3.Is there a significant difference on the mitotic index among the overcooked hardboiled eggs and normal cooked hardboiled egg? 4.Is there a significant difference between the mitotic indexes of overcooked eggs cooked in different time intervals?
Scope and Limitations Boiling is the method used in cooking the eggs Three time intervals (including the normal cooking time) Positive and negative controls for comparison Allium cepa test is used (microscopic analysis only) No chemical analysis made Study is conducted at MSU-IIT IDS Chemistry Laboratory II
TREATMENTDESCRIPTION ACooked at normal cooking time BCooked 2 minutes beyond normal cooking time CCooked 5 minutes beyond normal cooking time SAMPLEDESCRIPTION AExposed to Treatment A BExposed to Treatment B CExposed to Treatment C Positive Controlexposed to 0.05% colchicine Negative Controlexposed to distilled water Table 1. Treatments Done to the Hardboiled Egg Table 2. List of the Different Sample of Roots
Allium cepa test 1.Distilled water 2.Treatment solution (45 minutes) exposure to the treatment 3.Distilled water 4.Fixative solution (30 minutes) freeze the cells 5.Distilled water 6.1 M HCl and left (10-12 minutes) to soften the root tip 7.Distilled water.
Results of the Experiment A.Normal Cooking time: 15 minutes B.Physical Characteristics (Overcooked vs. Normal) (a)Normal-cooked egg, (b) Egg cooked 2 mins. beyond normal, (c) Egg cooked 5 mins. beyond normal
Fig. 1. Mitotic Indices of the Onion Roots Exposed to the Different Treatments C. Microscopic Analysis
Can be caused by CARCINOGENICITY, which is a type of MUTAGENICITY
Fig 2. Normal Mitosis of Allium cepa roots (from the left: Interphase, Prophase, Metaphase, Anaphase, Telophase) (Huss, 2007)
Fig. 3. Chromosomal aberrations detected in Replicate 2 exposed to treatment B: (A) chromosomal bridging during early anaphase, (B) chromosomal stickiness.
Hypothesis Testing (One-way ANOVA) H o : μ 1 = μ 2 = μ 3 = μ 4 = μ 5 H 1 : at least one differ from the others α = 0.05 (level of significance) Table 3. Basis for Groups for ANOVA and Post hoc Analysis Group #Treatment 1Positive Control 2Negative Control 3Treatment A 4Treatment B 5Treatment C
Reject Ho since p-value= is less than α = Proceed to Post hoc Analysis! Table 4. ANOVA table SourceSSdfMSF p-value Treatment2, Error Total2,
Table 5: Post hoc Analysis: p-values for pairwise t-tests Group # Group 2Group 3Group 1Group 5Group 4 Mean Group Group Group Group Group
Treatment A vs. Controls Group 3 has no significant difference with group 2 since their p-value is equal to which is greater than α= Group 3 has no significant difference with group 1 since their p-value is equal to which is greater than α= μ 1 = μ 3 μ 2 = μ 3
Treatment B vs. Controls Group 4 has a significant difference with group 2 since their p-value is equal to which is less than α= Group 4 has a significant difference with group 1 since their p-value is equal to which is less than α= μ 1 μ 4 μ2 μ4μ2 μ4
Treatment C vs. Controls Group 5 has a significant difference with group 2 since their p-value is equal to which is less than α= Group 5 has a significant difference with group 1 since their p-value is equal to which is less than α= μ 1 μ 5 μ2 μ5μ2 μ5
Treatment A vs. Treatment B and Treatment C Group 3 has a significant difference with group 4 since their p-value= is less than α= Group 3 also has a significant difference with group 5 since their p-value= is less than α= μ3 μ4μ3 μ4 μ 3 μ 5
Treatment B vs. Treatment C Group 4 has no significant difference with group 5 since their p-value is equal to which is greater than α= μ 4 = μ 5
Summarizing the Results μ positive = μ A μ negative = μ A μ positive μ B μ negative μ B μ positive μ C μ negative μ C μ A μ B μ A μ C μ B = μ C
Conclusions 1.The normal cooking time to be considered for hardboiled eggs is 15 minutes. 2.There is a difference on the physical characteristics among the normal cooked hardboiled eggs and overcooked hardboiled eggs. 3.There is a significant difference between the mitotic indices in the roots of the Allium cepa exposed to normal cooked hardboiled egg and overcooked hardboiled egg. 4.There is no significant difference between the mitotic indices in the roots of the Allium cepa exposed to overcooked egg cooked at different time intervals.
Recommendations The researchers recommend the ff: To do more study about this research using other mutagenicity tests like Drosophila, etc. To test the possible effects of raw eggs to the cells. To test other variety of egg samples such as ducks, birds and native chicken.