JCE Online Journal of Chemical Education
 | Subscriptions  | Software Orders  | Support  | Contributors  | Advertisers  | 

JCE Print
   Current Issue
 Previous Issues
 Supplements
 Search JCE Index

JCE Digital Library
   JCEDLib Catalogue
   ChemInfo
 Data-Driven Exercises
 DigiDemos
 Featured Molecules
 LivTexts
 LrnCom
 QBank
 SymMath
 WebWare

JCE Software
   Latest Releases
 Software & Video
 Downloads
 Support

Only@JCE Online
   JCE Online Store
 JCE HS CLIC
 JCE Discussion Forums
   Biographical Snapshots
 ChemEd Resource Shelf
 Featured Molecules
 Hal's Picks
 Project Chemlab
 Reviewed WWW Sites
 "Web-Ed" Articles

About JCE
   Features
 Publications
 Operations
 Outreach
 Contact Us


  Home > JCE Print > Journal of Chemical Education > Issues > 1999  > May  >
Chemistry Everyday for Everyone
JCE Classroom Activity
Soup or Salad? Investigating the Action of Enzymes in Fruit on Gelatin
Erica Jacobsen
University of Wisconsin - Madison, Department of Chemistry, Madison, WI 53706
Cover
May 1999
Vol. 76 No. 5
p. 624A
Abstract
Most enzymes are proteins that have evolved to function as catalysts for chemical reactions in living systems. Some fruits contain proteases, a group of enzymes that catalyze the cleavage of peptide linkages in proteins. This can have an undesired effect in a gelatin salad containing fruit, because proteases in the fruit can cleave the proteins that make up the structure of gelatin so that it will not set. This is the reason for the warning on many gelatin packages "Do not use with fresh or frozen pineapple." Other fruits may also be included in the warning. Fresh pinepple, papaya, kiwi, and figs contain the proteases bromelain, papain, actinidin, and ficin, respectively. When the enzymes are denatured, which can result from heating during the canning process, they lose their ability to cleave proteins.
Supplement
The activity sheet is available as a pdf file, which can be accessed using Acrobat Reader.
*  Contents
*  Download supp624A.pdf
More Information
*  Citation
 Jacobsen, Erica. J. Chem. Educ. 1999 76 624A.
*  Keywords
 Introductory / High School Chemistry; Teaching / Learning Aids; Enzymes; Classroom Activity
*  History
 Created:
Last Updated:		 June 11, 1999
June 23, 2005
<< Previous Article Table of Contents Next Article >>
  Home > JCE Print > Journal of Chemical Education > Issues > 1999  > May  > Page 624A



Chemistry Teacher Connection

The "Chemistry Teacher Connection" (CTC) is especially for high school chemistry teachers. For only $40/year, it offers an online-only subscription to CLIC along with membership in the Division of Chemical Education, normally $65/year. CTC subscribers receive access to all articles and supplements from 1996 through the current issue.
More About CTC
Order the Chemistry Teacher Connection

C&EN CLICs

Through special arrangement with the ACS, JCE High School CLIC is now able to provide subscribers with online access to Chemical & Engineering News articles that have been selected specifically for secondary science instructors and their students. 
 C&EN CLICs

JCE Collections Available
Occasionally, collections of JCE back issues become available for donation to individual teachers, schools, or libraries. JCE matches collections with interested recipients. Recipients pay shipping costs or pick up the collection.
 List of available collections

Contributions Welcome
JCE welcomes your submission
 Contributors's Corner

Subscriptions
 Subscription Info
 Order Forms

Fishing for New Ideas
Always in the
process of
improving, CLIC
welcomes ideas and comments.

Email Us

Comments to
jceonline@chem.wisc.edu		 Copyright © Division of Chemical Education, Inc., American Chemical Society.
All rights reserved.