| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| Ag8n | "Now, to change the topic a little bit. What happens once all this testing gets going? In industry, a financial auditor appears and says " you are..." | Read more » | over 1 year ago | |||
| Ag8n | "There are variations on the method, but check out the USP if using for medical applications. The oldest is a straight " gel clot". The sample is ..." | Read more » | over 1 year ago | |||
| Ag8n | ""Pharmacopeia online" is at " uspbpep.com". " | Read more » | over 1 year ago | |||
| Ag8n | "The Wikipedia article is an interesting read. The initial data said horseshoe crab mortality from L.A.L. testing should be about 3%. However, rec..." | Read more » | over 1 year ago | |||
| Ag8n | "Here's where life gets a bit interesting. There are substances called pyrogens. These cause a fever, sometimes severe, even if the carrier bacteri..." | Read more » | over 1 year ago | |||
| Ag8n | "As a refresher, read USP 31, <1231>"Water for Pharmaceutical Purposes". This is available, for free, from Pharmacopeia online, as mentioned ..." | Read more » | over 1 year ago | |||
| Ag8n | "Error here. It should not be objective c, as noted above. It should be some plastics are showing higher extractables than bulk water. Something..." | Read more » | over 1 year ago | |||
| Ag8n | "Getting a hold of the USP used to be difficult and expensive. While current USP may still be expensive, here is a source for older versions. "Pha..." | Read more » | over 1 year ago | |||
| Ag8n | "USP/BP/EP means United States Pharmacopoeia,BP is British Pharmacopoeia, and EP is European Pharmacopoeia. Sections of the USP are divided into mo..." | Read more » | over 1 year ago | |||
| Ag8n | "The CO2 produced can be measured several ways. Each method has advantages and disadvantages and depends on the final use of the instrument. For exa..." | Read more » | over 1 year ago | |||
| Ag8n | "If you want an overview of TOC, Wikipedia is a good start. The current article seems pretty thorough ( dated 19 July 2022 by 75.143.92.215). Any c..." | Read more » | over 1 year ago | |||
| Ag8n | "Previous methods could be somewhat hazardous. To give an example, ammonia related chemicals often work their way into drug compounds. It can be f..." | Read more » | over 1 year ago | |||
| Ag8n | "Going back over this. We did a lot of work with total organic carbon (TOC). According to Dr. Paul Whitehead at egalabwater.com (the blog title is..." | Read more » | over 1 year ago | |||
| Ag8n | "It looks like a single beam instrument was used for this work. With a double beam instrument, there is no need for phrases like "OD435/OD415". Th..." | Read more » | almost 2 years ago | |||
| Ag8n | " Lichen1.docx Hopefully, this will attach. " | Read more » | almost 2 years ago | |||
| Ag8n | "In this area, lichens aren't common. Attached is a rough draft using lawn clippings to set up and test using various instruments. Don't know how ..." | Read more » | almost 2 years ago | |||
| Ag8n | "The tungsten lamp remarks only apply to the 660 nm red lines. " | Read more » | almost 2 years ago | |||
| Ag8n | "Best bet- use an old fashioned tungsten lamp. Not a LED claiming to be a tungsten lamp. An LED has a narrow bandwidth. An old fashioned tungsten..." | Read more » | almost 2 years ago | |||
| Ag8n | "Looking into the 660 nm lines. It's not that LEDs don't exist for 425 nm region. They do. But the ones in the catalogs seemed expensive. Going ..." | Read more » | almost 2 years ago | |||
| Ag8n | "There are 3 in 1 flashlights ( blue, white, and red) that would be good for this application- as long as the color was more like purple instead of ..." | Read more » | almost 2 years ago | |||
| Ag8n | "If you are using the public lab spectrometer, a light source for around 400 nm is needed. It looks like there are some blue or violet led bulbs/ f..." | Read more » | almost 2 years ago | |||
| Ag8n | "A test of this method might be to use lawn clippings and run it through the procedure. The idea is to extract chlorophyll, which should be presen..." | Read more » | almost 2 years ago | |||
| Ag8n | "Another, more current option , is to use a coffee grinder. With the temperature issues this material shows, probably using the frozen state would ..." | Read more » | almost 2 years ago | |||
| Ag8n | "As for the mortar and pestle, there are many options. Some mortar and pestles are very expensive, but they don't have to be. They should be easy t..." | Read more » | almost 2 years ago |