Во время автолиза клейковина становится крепче.

Во время means during.

It is a fixed expression: во время + genitive = during ...

The form во is used instead of в for easier pronunciation, especially before awkward consonant clusters.
Here, в время would be hard to say, so Russian uses во время.

Examples:

• во время урока — during the lesson
• во время работы — during work
• во время автолиза — during autolysis

Because во время requires the genitive case.

The base form is:

• автолиз — autolysis

After во время, it changes to the genitive singular:

• во время автолиза — during autolysis

So this is a normal case change:

• nominative: автолиз
• genitive: автолиза

Клейковина is in the nominative case, and it is the subject of the sentence.

The sentence structure is basically:

• Во время автолиза — time expression
• клейковина — subject
• становится — verb
• крепче — complement

You can tell клейковина is the subject because it is the thing that is becoming stronger.

Also, the verb is singular:

• становится — becomes / is becoming

That matches the singular noun клейковина.

Становится means becomes or is becoming.

It comes from становиться, an imperfective verb meaning to become.

Here it is:

• 3rd person singular
• present tense

So:

• клейковина становится крепче = the gluten becomes stronger
• depending on context, it can also feel like the gluten is getting stronger

Russian often uses the present tense for general processes or facts, which is exactly what is happening here.

Крепче is the comparative form, meaning stronger.

Base adjective:

• крепкий / крепкая / крепкое — strong, firm

Comparative:

• крепче — stronger

So:

• клейковина становится крепче = the gluten becomes stronger

This form does not change for gender or number.
Even though клейковина is feminine, the comparative stays крепче.

Compare:

• клейковина крепкая — the gluten is strong
• клейковина становится крепкой — the gluten becomes strong
• клейковина становится крепче — the gluten becomes stronger

The sentence uses the comparative because it emphasizes a change in degree.

Yes, you could.

• становится крепче — becomes stronger
• становится более крепкой — becomes more strong / stronger

Both are grammatical, but крепче is usually more natural and compact.

In technical or explanatory writing, Russian often prefers the simple comparative when possible:

• становится крепче

Also note the grammar:

• более крепкой uses the adjective in a form that agrees with клейковина
• крепче is an invariable comparative form

It can mean more than just stronger in a broad sense.

The adjective крепкий can mean:

• strong
• firm
• robust
• solid

In a baking or dough context, клейковина становится крепче usually means the gluten network becomes stronger / more developed / more resilient.

So stronger is the best basic translation, but in context it may imply firmer or more elastic/structured rather than physical strength in a general sense.

Russian word order is flexible, and putting Во время автолиза first is very natural because it sets the scene first:

• Во время автолиза клейковина становится крепче.

This is similar to English:

• During autolysis, the gluten becomes stronger.

You could rearrange the sentence, for example:

• Клейковина становится крепче во время автолиза.

That is also correct, but the original version sounds especially natural if the speaker wants to emphasize when this happens.

Because the sentence expresses a general fact or process, not a one-time event tied to a specific moment.

Russian often uses the present tense for:

• scientific facts
• habitual actions
• process descriptions
• explanations in recipes or technical texts

So:

• клейковина становится крепче = gluten becomes stronger

In English, depending on context, you might say:

• becomes stronger
• gets stronger
• is becoming stronger

Russian present tense can cover all of these ideas when describing a process.

The stress is:

Во врЕмя автолИза клейковИна становИтся крЕпче.

A helpful approximate pronunciation is:

va VRYE-mya av-ta-LEE-za klay-ka-VEE-na sta-na-VEET-sa KRYEP-che

A few useful notes:

• во время sounds like one common phrase
• становится is stressed on -ви-
• крепче has the ч sound like ch in cheese, but softer

If you want to sound natural, try saying the sentence in two chunks:

• Во время автолиза / клейковина становится крепче