Harris Handoko

5 Questions 7 Answers 0 Followers

Questions related from Harris Handoko

Does the Hydroxyl Value method also affect the carboxylic hydroxyls in a fatty acid?

I'm trying to determine the hydroxyl value of the fatty acid of castor oil in my product mixture. Ricinoleic acid has a secondary hydroxyl group in its chain. So then, if I do this test, will the...

28 February 2017 1,654 4 View

High purity (97%) ricinoleic acid shows three close spots on TLC, why is this?

I recently purchased a bottle of 97% purity ricinoleic acid (fatty acid of castor oil) and also have two others from different vendor sources (all are from China). For some reason, they all show...

11 February 2017 8,616 8 View

Selectively acetylating an alcohol group with anhydride in a compound containing both carboxyl and alcohol? Any good suggestions?

I'm trying to acetylate a hydroxyl group using anhydrides using TEA or DMAP. But I suspect the alcohol and carboxyl groups in the compound may be catalyzed as well and react with each other since...

19 May 2016 5,965 4 View

Iodine value tests on my methacrylated product yielded nonsensical values? Does it work on methacrylates?

I synthesized a methacrylated product from a hydroxy fatty acid. It's a very complex mixture of at least 3 - 4 compounds, which may have varying degrees of unsaturation as a result of the added...

11 May 2016 9,845 2 View

My real-time collected FTIR spectra (using ATR) shows a systematic shift in all peak positions. What happened?

Hello, I'm still learning the ways of FTIR and when I was trying to do real-time FTIR using an ATR device (ZnSe crystal), my spectra came out "delayed" (for lack of a better word) or shifted in...

26 February 2016 9,836 3 View