Tahini and NMR spectrometers
17 August 2004, 2:51 PM

On one of my cooking-related lists, someone asked if their jar of tahini was still okay. It turns out it was the normal oil/pulp separation that happens if non-homogenized are left to sit for a while. It's normal, and you just need to stir 'em together before using. Refridgerate after opening. Yadda, yadda, yadda.

But in looking up the information I came across this nifty gem:

Project No 2: SINGLE-CRYSTAL-TO-SINGLE-CRYSTAL PHOTOCHEMISTRY IN INCLUSION COMPOUNDS

[...]

Abstract:

Tahini (sesame paste) has the interesting phase behavior of becoming more viscous with the addition of water. Natural products, such as tahini, are made up of many chemical components. The goal of this project is investigate the suitability of magnetic resonance spectroscopy to investigations into tahini-water mixtures, with the ultimate aim of understanding the interactions underlying the phase behavior at the molecular level.

Research Question:

What are the spectral signatures of water-tahini mixtures as a function of viscosity?

The Proposed Research:

  • Guided reading and hands-on learning of NMR spectrometer operation.
  • Sample preparations.
  • 1H NMR measurements of tahini-water mixtures.
  • Analysis of spectral signatures - possibly including simulations.
  • Interpretation of results based on comparisons of spectral signatures of different samples.

[...]

Neat. :-)

Mustang Grapes
17 August 2004, 9:47 AM

Last year about this time, a co-worker of mine brought in some boiled down juice from the wild mustang grapes growing on his property. I made some of the best grape jelly I've ever had out of that juice.

Of course this year I've been scanning the roadside to see just when it is that the grapes appear and sometime last month they finally did. The vines are everywhere but so far I've only found one stand that actually has grapes. Yesterday I think I discovered the reason why, as we drove by a doe happily munching on the grapes of another vine.

Unfortunately for me, all these vines are on someone else's property so I can't go picking myself a batch. (Unless I go over and ask if I can. Which I'm tempted to do soon.)

The same situation is true of the prickly pear cactus. Most of the ones I can see around here are devoid of fruit and the few that have some are out of my reach. When I visited my friend an hour south of here the fields in her area were full of red fruit-laden prickly pear. *sigh* I'd like to get some of those too, in order to make prickly pear fruit jelly. I'm going to have to find someone who has a large property and ask for permission to go picking stuff.

Here's some interesting info on my momentary obsession:

Mustang Grape Jelly

Mustang Grape Pie

Mustang Grape Wines (Good general information about the grapes and some pictures too.) Texas Electric Cooperatives also has an historical article about Texans and the mustang grapes.

Here's one good picture of the wild vines. Here's anotehr one but another site has some closeups of the leaves.

This is a great site, listing the different types of Vitis grapes across Texas and even their nutritional content. The Wildflower Center includes them in it's Native Plant Information Network.

Fazia Rizvi

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