After stirring, she poured the aqueous solution into a special bucket. There is a small opening under the barrel, and the small mouth is plugged with a wooden stopper.

"What's next?" Mei Zhiyan drew all these experimental devices on paper, and added words on the side to make it easier to understand.

"Purify," Gu Li replied, "You'll be able to see later, this aqueous solution will be layered." ”

As she said this, she glanced at the notebook in Mei Zhiyan's hand.

He remembered it very carefully, and if she was in her previous life, she was definitely an out-and-out scholar.

After a few moments, the aqueous solution in the bucket was divided into three layers.

"Come and see." Gu Li shouted to Mei Zhiyan.

Mei Zhiyan leaned over and listened to her say: "The top layer is a fat-soluble substance, that is, it can be dissolved in oil. The middle layer is an insoluble substance, which is insoluble in grease and water, so it is suspended in the middle. ”

"As for the bottom layer, it's a water-soluble substance, and Penicillium is soluble in water, and it's in the bottom layer."

As Gu Li said this, he took off the wooden cork that blocked the small mouth under the barrel, and let the bottom layer of the aqueous solution in the barrel flow out slowly.

Mei Zhiyan watched and recorded at the same time. Seeing this, he also understood the purpose of Gu Li's vegetable oil in it just now, as well as the function of this special wooden barrel.

Vegetable oil is added to allow the solution to stratify, and the lower end of the barrel is opened to allow the penicillium dissolved in the water to flow out of the lower end.

In order to prevent impurities from being mixed, Gu Li blocked the small mouth when the water solution in the barrel was not completely exhausted.

"The next step is to continue purifying." As she spoke, she poured the solution into a large bottle with a large mouth at the top and a small mouth at the bottom, and a pumpkin vine attached to the mouth. The big bottle was upside down on a wooden frame, and this wooden frame was made by Wu Bai for her.

"This charcoal is the one you asked for from Phoenix Terrace, I have boiled it and eliminated the poison." Gu Li put the charcoal powder into the bottle and stirred it.

Mei Zhiyan didn't know that the discarded charcoal from Phoenix Terrace could still be used for this purpose.

"Can charcoal be used to remove impurities?" He asked.

"yes." Gu Li responded, "Charcoal has a good adsorption effect and can adsorb Penicillium into it. Of course, it's not just Penicillium that's being adsorbed in, it's something else. We'll get rid of all of these things later. ”

"Hmm", Mei Zhiyan agreed, looked intently, and recorded it on the paper.

"I'm infusing boiled distilled water, which washes out impurities."

With Gu Li's action of pouring distilled water, a thin stream of water passed through the pumpkin vine inserted at the mouth of the vial, slowly flowed out, and flowed into the bottle under the pumpkin vine.

The rubber tube couldn't be found, so Gu Li took a pumpkin vine to replace it.

The water that flowed out was full of impurities, Gu Li discarded it, took a clean bottle again, and put it under the pumpkin vine.

"Is it vinegar poured in this time?" Mei Zhiyan saw Gu Li pick up another bottle of transparent stuff and pour it into it, so she asked.

The liquid has a strong sour smell and smells like vinegar.

"It's vinegar, but it's not all vinegar, it's acidic water made of vinegar," Gu Li replied while pouring, "Penicillium is a weakly acidic substance, and it is insoluble in acidic water. Therefore, I pour acidic water at this time, and I can wash out the impurities that can be dissolved in acidic water, and further purify Penicillium. ”

Mei Zhiyan nodded and immediately recorded it on paper.

"Finally, pour in alkaline water." Gu Li picked up the last bottle of water and began to pour it into it again.

Mei Zhiyan questioned: "How did you get this alkaline water?" ”

"I boiled the juice with seaweed, and what I got was alkaline water." Gu Li smiled slightly and replied.

"Can Penicillium be soluble in alkaline water?" Mei Zhiyan asked again.

Gu Li nodded: "Yes, Penicillium can be dissolved in alkaline water, so what flows out now is the penicillin solution." ”

Mei Zhiyan stared intently at the outlet of the pumpkin vine, and saw the bubbling water flow into a clean, empty bottle.

When the water ran out, Gu Li took the bottle with the penicillin solution and poured the solution into a thick piece of paper.

Suddenly, the paper was saturated with water.

"I'm going to cut it into a foot-long piece of paper and put it in a petri dish with staph bacteria in it." Gu Li said.

"Why cut it to a foot long?" Mei Zhiyan asked the question in her heart.

"Because the concentration of these penicillin solutions is different, I have to choose the best one." Gu Li replied.

Mei Zhiyan nodded, and recorded what she said.

Gu Li prepared a total of twenty petri dishes containing staphylococcus, and she put twenty small pieces of paper one foot long in each petri dish.

"If the extraction is successful, a small white dot will appear around these small pieces of paper, indicating that penicillin has killed the surrounding staphylococcus. If there are no small white dots, the experiment has failed. Gu Li explained.

Mei Zhiyan replied shallowly.

Gu Li saw that his eyes that emerged from above the mask were flashing with a different kind of light, with expectation and excitement.

She herself did not expect much from the results of the experiment. Although she specially opened up a laboratory in the Chunhui Hall, and under the existing conditions, she has achieved the ultimate control of various experimental devices, but this is only the roughest and most unreliable experiment.

The probability of success of the experiment is not high.

But she didn't tell Mei Zhiyan these words for the time being.

"How long will it take to see the results of the experiment?" Mei Zhiyan asked.

"Wait another seven days." Gu Li responded.

Mei Zhiyan's eyes flashed with excitement, and if he waited for another seven days, maybe he would witness the moment that would change the fate of mankind.

At the end of the experiment, the two of them left the laboratory with the waste.

Mei Zhiyan went to dispose of the waste, while Gu Li went to change her clothes, wash her hands, and go to see a patient.

When she was looking at a patient, she suddenly saw an acquaintance approaching. Seeing that person, Gu Li suddenly had a headache.

"Sister Gu, you're busy." Ji Chen smiled and greeted her very warmly.

He smiled gracefully and beautifully, other girls might be able to be fascinated by him, but this was completely useless to Gu Li.

He's not her thing, and it's not his one she likes.

"Hmm", Gu Li responded, and said, "If Ji Gongzi has something, please wait until I'm done." ”

"Okay, you're busy, I won't bother you." Ji Chen agreed very happily and waited quietly for her beside her.