Student Research Reports

View Research Report

This study investigates whether placement of a silver coin in maple sap can reduce bacterial growth. The Silver Coin Theory, attributed to this author, suggests silver possesses antibacterial properties, rooted in ancient practices. This research tests whether this theory holds up. When the number of bacteria in sap increases, pH goes down, with 7 being neutral, 1 being acidic and 14 being basic. Maple sap samples were placed in clear containers with either a penny, nickel, or dime (pre-1965) and monitored for pH and temperature every 15 minutes over three hours. A digital pH meter was used to measure pH levels, with the hypothesis the silver dime would show the least bacterial growth. The results showed no significant difference in bacterial growth or pH levels between containers with coins and those without coins. All containers, including those with silver dimes, experienced a gradual decrease in pH, indicating bacterial activity, but no coin outperformed others in preserving sap quality. The reason milk and apple cider were tested was because milk spoils and apple cider turns to vinegar during bacteria growth, reducing pH. The penny and nickel were also tested as other variables to show different possible reactions of the liquids. The hypothesis a silver dime would prevent the most bacterial growth was not supported. The findings suggest the Silver Coin Theory may not be effective in preserving sap. Future studies could focus on testing different antimicrobial agents or exploring other preservation methods to ensure sap quality.