Comments

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 » about 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 » about 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 » about 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 » about 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 » about 2 years ago