after 24 and 48 hours in each test‚ against 7 day old (3rd instar) larvae of S. litura on castor leaves. Stock solutions of the test compounds were prepared in the carrier solvents. Further dilution was done in emulsified water by maintaining emulsifier (Tween – 80) level at 0.5 % to yield various concentrations. Castor leaf discs (4 cm diameter) were punched out from the washed and dried castor leaves. Leaf discs were dipped thoroughly in each of the concentration and air dried. Moist filter paper
Premium Bacteria Microbiology Escherichia coli
Abstract This work describes the extraction of caffeine from tea leaves to determine its % caffeine. The extraction process selectively dissolves one or more compounds in a mixture into an appropriate solvent. In this experiment‚ it was visible in the process wherein the components of the tea leaves were dissolved in two solvents‚ water and dichloromethane (DCM)‚ with DCM used for multiple extractions. The organic layer was evaporated and the determined % caffeine was 0.12%. Furthermore‚ the purified
Premium Tea Caffeine Solubility
“CAN CACAO LEAVES KILL PESTS?” SUBMITTED BY: LOUIE ANNE C. DIVINAGRACIA SUBMITTED TO: MADEL F. VALENCIA I. INTRODUCTION A. Background of the study We all know that insects can be seen everywhere and the only way to prevent these insects are to use insecticides. For us‚ a house is a place of residence. It is usually a place in which an individual or a family can rest‚ store personal property‚ and prepare food in able for the house fulfils its function‚ we need to eliminate some
Premium Insecticide Chemical substance Chemical reaction
cancelled the rest of the week and there was a mandatory evacuation! When I got home from school it was like a mad house! Leashes were laying around‚ clothes were thrown around the room‚ and there were suitcases. My mom and dad decided that we should leave and evacuate to Atlanta because my mom already had to go there for business that weekend anyway. So that Monday morning
Premium Family Mother English-language films
If an employee leaves a company to work for a competitor‚ what types of knowledge could be ethical for the employee to share with the new employer and what types of knowledge would be unethical to share? With business in constant competition‚ losing an employee to a competitor could pose threat to the success of a company with the knowledge a former employee brings the competitor. Ethics‚ by contrast‚ is defined as the principles and standards of moral behavior that are accepted by society as
Premium Ethics Morality
know on Thursday 23 June 2016 UK held a referendum to decide whether the UK should leave or remain in the European Union. The EU is a political and economic partnership between 28 countries that started after World War. This with the theory that countries that trade together are more likely to avoid going to war with each other. In Britain 30 million people or 71.8% of the population turned out to vote. The leave vote won by 51.9% to 48.1% which has been labelled Brexit. The result was a shock to
Premium European Union United Kingdom Europe
Extraction of Caffeine from Tea Leaves Introduction Caffeine is soluble in boiling water and as a result it is easily extracted from tea bags by steeping in hot water. This process leaves behind the water insoluble portions of the tea bag. However‚ water extracts more than just caffeine‚ so a final separation is done with an organic solvent that will dissolve primarily caffeine. The organic solvent used in this experiment is Dichloromethane (CH₂Cl₂). Dichloromethane is less polar than water
Premium Caffeine Coffee Tea
Multi-Colored Fabric Dye From Talisay (Terminalia catappa) Leaves Extract Pauline Mariz Manuel Marjorie Marmeto Jiezel Ann Sescar Mrs. Ma. Regaele Olarte (Research Adviser) Statement of the Problem The researchers aimed to determine if the Talisay (Terminalia catappa) leaves extract could be developed as a multi-colored fabric dye. Specifically‚ the study sought to answer the following questions: 1. Can Talisay (Terminalia catappa) leaves extract be developed as a multi-colored dye?
Premium Computer Biometrics Plastic
known as Ke Xing which says that the baby that causes the death of her mother during child birth is considered to have something stronger than the mother’s spirit‚ which is considered bad luck. Adeline’s mother died in giving birth to her. Falling leaves is the true story of Adeline Yen Mah. It told of a person that was discriminated and emotionally abused by her family for all her life since her birth‚ all her life she suffered and was punished by her family from something she was innocent of and
Premium Family
Date of experiment: September 3rd‚ 2013 Organic Chemistry II – CHLB330 Name: Symone MoxeyLab Partner: Lynden Cooper Isolation of caffeine from tea leave Abstract:- Introduction:- Caffeine is probably the most commonly used addictive drug. This drug is found in a number of things ingested by people. It belongs to a group of nitrogen bases called purines. Because caffeine possesses these base-like properties‚ it is described as an alkaloid. They usually taste bitter and often are physiologically
Free Chemistry Solvent Caffeine