nav[aria-label="Primary Navigation"] { padding: 0; & ul { list-style: none; width: 100%; display: flex; flex-direction: row; justify-content: start; align-items: start; gap: 30px; padding: 0; & li { margin: 0; } & ul li { list-style: none; } } }

Vacuum filtering

Sixten_26971

I'm wondering if anyone has experience with vacuum filtering food related liquids, like juices and stocks. I recently bought a büchner funnel, paper filters and equipment to apply vacuum to the funnel.

I've tried filtering some fresh juice, that was pre-filtered through a 100µm bag and it seemed like it would immediately clog up the paper filter, only filtering a few centiliters. Seeing this I cut out a piece of fine cloth and could filter about 400ml before it was completely clogged. The juice was rhubarb and I hadn't treated it with any pectinase.

From some reading it seems the filtering can be improved using diatomaceous earth to catch the particles, but does anyone have any experience using this or other ideas on how to use my büchner funnel more efficiently.

Find more posts tagged with

What About Tools?

Comments

quintenmyth

I used buchner funnels, but only in the lab. What are you trying to accomplish here (except for clear juice)?

brian_martin2001

I've tried using a buchner funnel in the past. I find it quickly gets clogged. I have had good results using a chemex coffee maker. It sometimes takes a while, last time took me about 24 hours, so patience is a must, but you might consider that as well.

Rich_McDonough_67546

I have a vacuum pump on order and this is something I plan to do but have not yet had the chance to try... You can get different filters that allow varying particle sizes through. Maybe you just need a more coarse filter (for the first run at least)?

Sixten_26971

I tried the more coarse filters in the form of using cloth and still clogged pretty quickly. It's also a bit difficult to source paper filters as the chemist suppliers don't really sell to people who aren't affiliated to a lab. I currently have some knockoff Chinese whatman paper filters, which I know are knockoffs as the edges are a bit ugly and there's no markings on the package for paper characteristics.

Sixten_26971

Mainly clear juices, but I also want to try making clarified stock, like Hervé This described in his book "molecular gastronomy".

Depending on what I feel about cleaning oil from the funnel I might also try filtering frying oil in the funnel, as my current process is to filter coarsely and finish with a washing method from biodiesel production.

Currently I feel that the filters clog way to fast to be very useful and I might as well use cloth stretched over containers for rough filtering and chemex or other coffee filters for any fine filtering needs.

matthewmicahhall

This doesn't specifically address your question, but have you looked at agar gels as an alternative technique for clarification? It has potential issues as well, but it's reasonably scalable and can have good yield.