Which solvents should I use to test antioxidant activity of polysaccharides using DPPH assay?

What are the differences between Spurway and CAT+ extraction of bioavailable nutrients, aside from the extraction agent (acetic acid and calcium chloride respectively)?

Since the TPC formula is cv/m, i want to know what sample volume v refers to. Is it the volume of the diluted sample or the sample we mixed when conducting the TPC assay?

Hi,

I've concentration of SO4 expressed as mg/l in an elute in water from a soil sample. I'd like to convert this information into concentration in dry matter (expressed in mg/kg) to compare my data with a number of previous analytical data.

I've the amount of dry matter in each sample expressed as a percent.

Is there any possibility to make this conversion?

Thank you.

Disease can be a major problem in aquaculture, the farming of aquatic organisms such as fish, shellfish, and seaweed. Disease outbreaks can result in significant losses in production and can also have negative impacts on the environment. Therefore, it is important to identify effective methods for controlling disease in aquaculture systems.There are several strategies that can be used to control disease in aquaculture systems:

I need to freeze dry cyanobacterial solution, but I don't have acces to freeze dryer.

Can I freeze my solution and use "sodium hydrxide solid form" to absorb the moisture?

Low birth weight (LBW) is still a major public health issue, particularly in poor nations. However, LBW is still linked to cardio-metabolic, mental, and infant and adult mortality in both developed and developing nations. Between 15% and 20% of all births are thought to be LBW or very low birth weight ( 1500 g), as defined by the World Health Organization (WHO), which equates to at least 20 million infants worldwide.

Pregnancy-related hypertensive diseases, diabetes, starvation, hemorrhage, anemia, infections, fetal or placental abnormalities, and multiple pregnancies are risk factors for LBW.

Actual reviewing of an article requires clear and updated knowledge on the subject as well as about the stage of contemporary research on the topic of article. It is a tusk of experts.

But journals, even the journal take Article Processing Charge and/ or PDF downloading charge at a very high rate and get a huge amount of profit every year do not pay any money to the reviewers.

I know some journals who pay 1000-1500 USD to the review article writers, but do not pay a single pice to the reviewers.

Why free service is expected from the reviewers where the target is business?

Why reviewers are deprived from payment for their time and high quality services?

If I follow this protocol: The antioxidant activity of the extracts was  tested using DPPH as previously described with some modifications (Zhang et al., 2011). Briefly, the DPPH free radical scavenging activity of grain extracts was determined using a 2 × 10−4 M DPPH solution. Each sample (0.5 ml) was mixed with 4 ml 2 × 10−4 M DPPH in ethanol. The mixture was shaken, and then left to stand for 60 min in the dark. The absorbance was measured at 517 nm in a spectrophotometer. The absorbance of the control was obtained by replacing the sample with 80% methanol. The DPPH radical scavenging activity of the sample was calculated as follows: