| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| rahamath_prizm | " So good to know it got identified soon. passive income " | Read more » | about 6 years ago | |||
| straylight | " thanks solaris, yes, the yeast, like the sugar, has bolted. An analytical test for red and white wine, excellent, we are making progress :) Agre..." | Read more » | about 6 years ago | |||
| solaria | " Thanks Stray'. Actually, the 0.06 A for the wine was at 5 cm path. Divide by 5 to get 1 cm path for comparison. If yeast/fermentation was cont..." | Read more » | about 6 years ago | |||
| straylight | " solaria, great work, much kudos deserved. A rigorous experiment. Like david_uwi, I wondered at why sucrose is absorbing visible light (VL) at all..." | Read more » | about 6 years ago | |||
| solaria | " Well, the sucrose absorbance is very low, but it's not zero. See Sucrose Absorbance. Since the data is 'clean' and the calculations match expec..." | Read more » | about 6 years ago | |||
| david_uwi | " Problem I have is that sucrose solution looks colorless so does not absorb visible light. I feel that the changes in absorbance that you are seein..." | Read more » | about 6 years ago | |||
| solaria | "Here’s my try at this experiment. Basically, Yes, you can detect added sugar in wine, but it’s a very small change, and requires an accurate basel..." | Read more » | about 6 years ago | |||
| Ag8n | "Another good way to quantitate sugars is with a refractometer. They are pretty cheap and often used in wineries. " | Read more » | about 6 years ago | |||
| david_uwi | "Both glucose and sucrose solutions are colourless so visible light is not going to work. A homemade spectrometer will not go very far into the UV ,..." | Read more » | about 6 years ago | |||
| kokoz | "I think the sucrose is in different wavelenghts? in human body sucrose is broken down in to glucose.. " | Read more » | about 6 years ago | |||
| warren | "I don't know about glucose, but this post notes how to detect sugar (sucrose, i guess?) in wine: https://publiclab.org/notes/ygzstc/07-23-2014/dete..." | Read more » | about 6 years ago | |||
| 34zhijian | "Hi, how does one download the data in the appendix? Thanks! " | Read more » | over 6 years ago | |||
| stoft | "Good observations -- but why use a CFL which has poor SNR for wide-band averaging because the spikes prevent using higher light intensities for bro..." | Read more » | over 10 years ago | |||
| ygzstc | "Thanks a lot Jeff! " | Read more » | over 10 years ago | |||
| warren | "I think i found the data on Yagiz's Spectral Workbench profile, and I made a set: https://spectralworkbench.org/sets/show/1369 Embeds don't seem t..." | Read more » | over 10 years ago | |||
| straylight | "ah yes, good thinking. well done again on your work, a very well written research note as well. stu " | Read more » | over 10 years ago | |||
| ygzstc | "Thanks Stu... I just wanted to see if added sugar is detectable first. If yes, you can may be measure the sugar levels during wine making process a..." | Read more » | over 10 years ago | |||
| straylight | "A rather nice exercise, well done. Quite surprising results I think, I would have predicted the extra sugar to have had minimal effect on the trans..." | Read more » | over 10 years ago | |||
| btbonval | "I just saw an article about detecting if a drink has been drugged: http://www.gadgetify.com/pd-id-tells-drink-drugged/ How much sugar is in wine? ..." | Read more » | over 10 years ago | |||
| warren | "Oh I was just hoping for links to the raw data you collected. " | Read more » | over 10 years ago | |||
| ygzstc | "Info about the spectra is in the appendix already but I guess you mean something different by linking? Am I missing something? " | Read more » | over 10 years ago | |||
| warren | "Sorry! Spectral Workbench. " | Read more » | over 10 years ago | |||
| ygzstc | "Sorry but what is SW? " | Read more » | over 10 years ago | |||
| warren | "Wow, very cool! Can you link to your spectra on SW? " | Read more » | over 10 years ago |