WWW ChemTools
Ion Formula by Mol. Weigh t
Isotope Pattern Calculator
Mass Loss Calculator
Periodic e-Table
WWW BioTools
EMBL Peptide Search - protein ID from peptide mass and sequence data
FindMod - post-translational modifications by peptide mass
GlycanMass - oligosaccharide mass from structure
GlycoMod - oligosaccharide structures from mass
GlycoSuiteDB - search database with oligosaccharide mass
Javascript Protein Digest - peptide digest masses
Javascipt Fragment Ion Generator for peptides
Mascot Search - peptide mass and sequence tools
Mowse - protein identification from peptide MS data
Protein Prospector - mass spectra interpretation tools
PROWL - identification of proteins from MS data
past feature
pull down navigator : home
about www.i-mass.com
advertise
books
career
conferences
discussions
features
feedback
guides
history
laboratories
manufacturers
societies
software
summary - site map
Mayan Chocolate
US scientists have discovered residues of cacao from which chocolate is made in ceramic vessels found at the Maya archaeological site at Colha, Belize in Central America.
Most of the ceramic vessels were found in the burial sites and were manufactured during the period 900 BC to AD 250. This pushes back the earliest chemical evidence of chocolate use by about 1,000 years.
Residues from 14 jugs were sent to Hershey Foods in Pennsylvania for analysis. Jeffrey Hurst of the chocolate company used a combination of high-performance liquid chromatography and mass spectrometry to analyse the tiny 0.5-gram samples and found traces of cocoa in three of the jugs. Hurst reports the scientists were surprised by the findings but added that the chocolate company had no interest in reviving the Mayan's chocolate recipes. "...the recipe is nothing like the chocolate taste we gravitate towards today."
The evidence suggests chocolate was not eaten as an occasional snack or used as a sweet ingredient. Instead, it was consumed with most meals, usually mixed with another ingredient, such as water, maize, chilli and/or honey. The jugs would have been used to pour the liquid from a spout, in the same way we use a teapot today. Documents written at the time of the Spanish Conquest suggest liquid chocolate was agitated to produce a foam.
The research appears in the July 18 issue of the journal Nature.
MS Journals
European Mass Spectrom.
Intl. J. of Mass Spectrom.
J. American Society of MS
J. Mass Spectrometry
J. MS Society of Japan
Mass Spectrometry Reviews
Rapid Communications in MS
Science Journals
Analyst
Analytical Chemistry
Nature
New Scientist
Science
Scientific American
Literature Search
Beilstein Abstracts
ChemWeb
Current Contents - ISI
PubMed - NCBI
PubScience - DOE