hornad
New Member
USA, Washington, Bremerton, 8b
Posts: 9
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Post by hornad on Apr 9, 2021 10:55:44 GMT -5
The Genebank Project, NARO in Japan has a variety of Poncirus Trifoliata with an astounding 17 brix (the highest of any citrus they tested). It is of course forbidden to import this into America, but other countries may be able to order clones. Regardless of the availability I am surprised that Trifoliata has the potential for such high sugar concentrations.
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Post by ilya11 on Apr 9, 2021 16:27:26 GMT -5
Poncirus fruits occasionally have such high Brix values. Sugar is high but when tasted is masked by high acidity.
Also, the presence of internal oils change refraction with Brix being determined not only by sugar content. |
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hornad
New Member
USA, Washington, Bremerton, 8b
Posts: 9
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Post by hornad on Apr 9, 2021 22:58:35 GMT -5
Poncirus fruits occasionally have such high Brix values. Sugar is high but when tasted is masked by high acidity.
Also, the presence of internal oils change refraction with Brix being determined not only by sugar content. What is a good procedure for excluding oils so one can test Brix properly?
EDIT: I looked up "correcting Brix" and discovered that acidic solutions (like lemon juice) cause the Brix to read too LOW!I think their Brix is already corrected for acidity because they don't have any citrus with Brix lower than the acidity.
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Post by ilya11 on Apr 10, 2021 3:48:30 GMT -5
You have to put the juice in the refrigerator for one night, oils will drop to the bottom.
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Post by Sylvain on Apr 10, 2021 6:18:34 GMT -5
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hornad
New Member
USA, Washington, Bremerton, 8b
Posts: 9
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Post by hornad on Apr 10, 2021 8:23:50 GMT -5
Yeah I did a nice scatterplot of Brix vs acidity The red points are Poncirus. I think it's really interesting how acidity goes down almost to zero, but brix never goes below 6
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hornad
New Member
USA, Washington, Bremerton, 8b
Posts: 9
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Post by hornad on Apr 10, 2021 18:24:01 GMT -5
You have to put the juice in the refrigerator for one night, oils will drop to the bottom. Thank you. I wonder if the difference in Brix before and after settling is a good way to quantify how much oils a particular poncirus fruit has. |
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till
Full Member
Posts: 154
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Post by till on Apr 20, 2021 3:51:34 GMT -5
Thank you, hornad, for bringing the sugar content to our attention. I try my best to breed a Poncirus with low acids. Today, I pollinated mine (a zygotic one) with Trifeola. Perhaps that helps. I have unfortunatelly no pollen for other experiments at the moment.
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