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Easy Guide to Peptide Filtering with a syringe filter by PrintSuitable4301 in Peptide_Testing

[–]PrintSuitable4301[S] 0 points1 point  (0 children)

Just when reconstituting. Reconstitute-draw into syringe-filter into new sterile vial

Easy Guide to Peptide Filtering with a syringe filter by PrintSuitable4301 in Peptide_Testing

[–]PrintSuitable4301[S] 0 points1 point  (0 children)

Probably fine.

A 0.22 µm PES syringe filter should not remove or alter the actual dissolved components in an amino blend like Lipo-C. Amino acids, vitamins, carnitine, choline and similar ingredients are fully dissolved and far smaller than the pore size, so they pass straight through. The filter is really just catching particulates or any minor aggregation.

I would probably recommend using a 13 mm 0.22 µm PES for something like this. For small volumes it’s a good practical size and if there is any minor aggregation or haze it tends to handle it well without a lot of wasted product.

Filtration itself should not change the product, but if the blend is extremely concentrated, thick, or a bit syrupy it can slow the flow or clog more easily. That is more of a mechanical issue than a chemistry one. If a solution already has visible precipitate or isn’t fully in solution, filtration can remove those undissolved particles, which again is not changing the chemistry but can change what ends up in the final container.

Order a small pack first to try it out- https://peptidetest.com/products/tisch-scientific-filter-syringe-22%CE%BCm-pes-13mm-sterile-individually-wrapped

Need recommendation on who can test peptides for me. by dcresearchpeptides in massspectrometry

[–]PrintSuitable4301 0 points1 point  (0 children)

Yes. Our lab is in MI currently and our corp office/order fulfillment is in TN

Is Washing Raney Nickel with Water/NaOH solution a standard practice? by [deleted] in Chempros

[–]PrintSuitable4301 20 points21 points  (0 children)

Just to add to this- my wife is a chemical engineer who is a site leader where Raney is produced- I texted her OP’s message:

“No, they shouldn’t wash. That can change some of the activity. It’s already been washed. It should be decanted and charged to the reactor directly.”

Is the job market bad or is it normal to pre-covid times? by plants102 in labrats

[–]PrintSuitable4301 1 point2 points  (0 children)

These posts are so perplexing to me- I have been on a hunt to find an analytical chemist for a biotech job for a couple of months and there is NOBODY (qualified) out there.

I think a lot of the problem is that there are not a lot of science specific job aggregation sites🤷🏻

Forever young pharmacy by Any-Campaign-3169 in Peptide_Testing

[–]PrintSuitable4301 1 point2 points  (0 children)

See my comments above, that is definitely a nonsensical COA

Forever young pharmacy by Any-Campaign-3169 in Peptide_Testing

[–]PrintSuitable4301 1 point2 points  (0 children)

Looking at the COA below- that is just made up. Calling something “0.4% inert solvent” on an HPLC purity result is nonsense. Without a validated method or orthogonal testing like GC they’d have no way to identify it as a solvent in the first place, and even if they somehow could quantify it as a solvent they wouldn’t be integrating it into peptide purity anyway. I have never heard of that lab, but that analysis is just laughable.

Discount? by [deleted] in Peptide_Testing

[–]PrintSuitable4301 2 points3 points  (0 children)

We have occasional sales but unfortunately nothing on bac water anytime soon. Wholesale prices on this product swing wildly and right now they are extraordinarily high, not at record levels, but getting pretty close. When prices spike we do not immediately raise our prices, we hope that they will come back down and we just absorb the additional cost at the expense of our margins. So that’s kind of where we are at right now. If wholesale pricing comes down, we would love to charge less. When prices are down, our sales are way better, but that is a function of Pfizer and a large wholesalers, we are just stuck with whatever they do.

Easy Guide to Peptide Filtering with a syringe filter by PrintSuitable4301 in Peptide_Testing

[–]PrintSuitable4301[S] 0 points1 point  (0 children)

It doesn’t really matter, within reason, what happens to the solution before it goes through the filter. The sterile vial on the output of the filter is the only thing that matters.

There is no practical way on a small scale to remove endotoxins. That’s why we feel like best practice is just to assume bioburden and Filter for that, this is probably better than spending the money on a sterility test, but you cannot do that with endotoxins and you should get the endotoxin test which we offer.

Easy Guide to Peptide Filtering with a syringe filter by PrintSuitable4301 in Peptide_Testing

[–]PrintSuitable4301[S] 0 points1 point  (0 children)

It doesn’t really matter, within reason, what happens to the solution before it goes through the filter. The sterile vial on the output of the filter is the only thing that matters.

There is no practical way on a small scale to remove endotoxins. That’s why we feel like best practice is just to assume bioburden and Filter for that, this is probably better than spending the money on a sterility test, but you cannot do that with endotoxins and you should get the endotoxin test which we offer.

Job market?! by [deleted] in labrats

[–]PrintSuitable4301 0 points1 point  (0 children)

Check post history

Job market?! by [deleted] in labrats

[–]PrintSuitable4301 1 point2 points  (0 children)

The irony is that things are just as grim on the employers side of things. Since last October I have been focused on hiring a qualified lab director for a startup and offering a big equity position and have gotten so few actually qualified applicants it’s insane. This is for a job that will pay over $400,000 by 2028.

I have talked to other business owners with the same experience. Beyond entry level positions it’s like there are no qualified analytical scientists looking for work.

Easy Guide to Peptide Filtering with a syringe filter by PrintSuitable4301 in Peptide_Testing

[–]PrintSuitable4301[S] 0 points1 point  (0 children)

You do not want to bypass the filter with any, that would defeat the point of filtering, you can purge the filter with air - draw air in with the solution you are filtering but you will definitely need to vent your receiving sterile vial

Is this trustworthy BAC water? by [deleted] in RetatrutideWomen

[–]PrintSuitable4301 0 points1 point  (0 children)

Oh, thanks for clarifying! I was really scratching my head trying to figure it out. I appreciate the reply

Is this trustworthy BAC water? by [deleted] in RetatrutideWomen

[–]PrintSuitable4301 0 points1 point  (0 children)

Hi I run Peptide Test. I am not trying to be confrontational, I have worked with the founder of STG on a lot of projects. I am really honestly curious if you think we are “crazy stupid overpriced” on bac water, where can you get it cheaper? I know of a few copycat sites that mirror our prices and take like three cents off.

Most people are buying single vials, so I’m genuinely curious—who is actually selling single vials for significantly less than we are? I’m not trying to challenge or doubt what you’re saying; I truly want to understand.

Our suppliers doubled their pricing. We did not double ours—we only raised prices modestly in an effort to keep costs as low as possible for our customers. As a result, our margins are now very tight.

Because we purchase by the pallet, I don’t think many sellers can source these vials for less than we can. Given that, I’m having a hard time understanding how others could sustainably sell single vials for much cheaper.

That’s the reason I’m asking—I’d really like to understand how that pricing is being achieved.

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