Increase the Shelf-Life of Fruits and Veggies
“THE EFFECTIVENESS
OF GUAVA LEAVES EXTRACT AS A NATURAL PRESERVATIVEFOR VEGETABLES AND
FRUITS”

Acknowledgment
The researcher would like to extend his sincere thanks and appreciation tothe following people who have contributed, in one way or another, to therealization of this study.Mr. Paul T. Tejero, for the assistance and valuable suggestions,conceptualization, editing the study, helping the researcher for the study, andfor the invaluable tips to improve the quality of the research study;Mrs. Josephine Impe, research adviser, for the encouragement andsupport to the completion of the study. Also, for the assistance and valuablesuggestions and for the invaluable tips to improve the quality of the researchstudy;To-ong and Tejero families, the wind beneath my wings as I reach mygoals in life, for the unconditional love and prayers, for understanding, andmoral support, despite of the challenges that come along;Most of all, to Almighty God, for giving the researcher the courage,knowledge, guidance, love and blessings.Stephen T. To-ong

Table of Contents
PageTitle PageAcknowledgmentChapter1 Problem & Background of the Study
…………………………………

Introduction……………………………………………………………… Statement of the Problem
…………………………………………….

Hypothesis…………………………………………….…………………… Objectives of the Study
…………………………………………….

Scope and Limitations……………………………………………. Definition of Terms
…………………………………………….

Significance of the study……………………………………………. 2 Review of Related LiteratureRelated LiteratureRelated Studies3 Methods of Research and ProcedureMethod of ResearchMethodology4 Presentation, Analysis & Interpretation of DataFindings
CHAPTER II REVIEW OF RELATED LITERATURE
Antioxidant is a type of molecule that neutralizes harmful compoundscalled free radicals that damage living cells, spoil food, and degrade materialssuch as rubber, gasoline, and lubricating oils. These work against the moleculesthat form free radicals by destroying them before they can begin the dominoeffect that leads to oxidative damage. Although oxygen metabolism is essentialto life, the antioxidants diminish excessive activity and damage to the cell.Antioxidants can take the form of enzymes in the body or vitaminsupplements. They are routinely added to metals, oils, and other materials toprevent free radical damage. Antioxidants are also used as industrial additivesand food preservative. Industrial antioxidants slow or prevent oxidative damagethat causes food to spoil, and fats and oil to change color or go rancid.Ascorbic acid or vitamin C and the synthetic antioxidants butylatedhydroxytoluene (BHT) and butylated hydroxyanisole (BHA) are among theantioxidants used nowadays as food preservative. These antioxidants are addedto foodstuffs in concentrations of much less than 1 percent.It was also reported that carotenoids, molecules found in tomatoes,carrots and guavas, have the ability to neutralize harmful compounds such as
Investigatory Project 2013 (Guava Leaf Extract Soap)
Background of the Study:

Nowadays, people have using different herbal soap that are expensive and less effective. The researcher aims to make an effective and cheaper herbal soap. Like guava leaves , it contains both major antioxidant pigments, carotene and poly phenols giving them high dietary antioxidant value among plant foods.

Guava leaves has a benefits in making herbal soap because it has that properties that can make the skin look good and protects the skin.
Significance of the study:

The significance of the study is to have a beneficial usage of guava leaves. Specifically on the fresh green leaves. This study also aims to produce an affordable herbal soap by making use of the natural properties of guava leaves extract. This product is more on natural properties that can cure skin infections like skin allergies, rashes and skin itchiness and does not mix with chemicals that may damaged our skin.

Scope and Limitations:

This study needs furthermore improvement , research and also this study is only limited on the use of caustic soda because we all know that to much of caustic soda may cause skin itchiness.

Definition of terms:

Guava- is a genus of about 100 species of tropical shrubs and small trees.

Antioxidant- is a molecule capable of slowing or preventing the oxidation of other molecules.

Pigments- is a material that changes teh color of light it reflects as a result of selective color absorptions.

Carotenoids- a pigment essential for good vision angd precursor to Vit. A.

Pol phenols- were one briefly known as vit. P which are a group of a chemical substances found in plants.

Review of related Literature:

Guava, is a genus of about 100 species of tropical shrubs and small treesin the myrtle family Myrtaceae. It is native in Mexico , as well Central America, Northern America and parts of the Carribeanbut not cultivated throughout the tropics. In Tagalog , name bayabas are probably local renditions of guayaba. Numerous references inmedical research identify guava as Psidium Guajava.

Psidium guajava are cultivated in many tropical and subtropical countries for their edible fruit. Psidium Guajafa are often considered superfruits , being rich in vit. A and C and other properties. Its leaves contained antioxidant pigments,carotenoids and Polyphenols that are good components in turning our skin healthy.

Since the 1950's , guva , prticularly its leaves , has been a subject for diverse research in chemical identity of its constituents, pharmacological properties and history in folk medicine . For example , from preliminary medicinal research in laboratory models , extract from guava leaves are implicated in therapeutic mechanisms against cancer , bacterial infections , inflammation and pain and skin disorder. Essential oils from gauva leaves have shown strong anti-cancer in vitro.

In folk medicine , guava leaves are used as a remedy for diarrhea, and for their supposed antimicrobial properties. Its easy to get the components of guava leaves when it is apply in a form of a soap.

Methodology:

A. Guava Decoction

We have to gather 50g of fresh green guava leaves, 250 mL of water and boil it for about 10 mins.

* Materials

one-half cup of oil, 3tbsp. caustic soda, 500mL of water and guava leaves extract

B. Preparation of Soap

From the materials gatherd , set aside guava leaves extract. Mix 500mL water and vegetable oil and stir for 30mins. Combine the guava leaves extract to the solution of water and oil, stir for 30mins. add 3 tbsp. caustic soda stir for another 30 mins. Put in a molder and place in a safe area that can't be expose by the sun.

C. Soap Cutting:

Cut the soap acc. to the size of the molder.

D. Testing the soap:

After 15 days the soap will be use either preventive or cure. The respondents to this is the people who have skin wounds. It will be apply in the skin when they take a bath.

E. Observation:

* The researcher had observed that the wounds heal faster.
* The soap speeds up the regeneration of the wounds.