The assay on anhydrous basis is a mathematically derived value from an experimental results of assay and water content tests. The results of assay and water content tests are determined, separately, on as-is basis. The industry-accepted formula for assay on anhydrous basis = (assay on as-is basis×100)/(100-%water). - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2846476/

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What is difference between anhydrous and dried basis?
1. anhydrous means : Means remove the water content & solvent free value calculated in the assay. 2. On dry base : Means remove the loss on dry & solvent free value calculated in the assay

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What is Formula of Potency calculation on Dried basis, As is basis& Anhydrous basis...
Answer / Vaibhav Goswami

potency = assay on dried basis x(100-LOD)/100

Potency= assay on anhydrous basis x(100-water)/100

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Assay “ as is ”
Calculation = Q/T x 100 = 495 / 500 x 100 = 99.0%

Assay
“ dried basis ” LOD
“anhydrous basis ” water

Assay result = [Q/T/(100-A/100)] x 100 = [295.0/300.0/(100-0.34)/100] x 100 = 98.7%

http://dmsc2.dmsc.moph.go.th/webroot/drug/km/lab_analysis/co... - page 4

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Opis fizyczny Biały lub prawie biały proszek
Rozpuszczalność (5% w 1M HCl) Przejrzysty, bezbarwny lub słabo żółty roztwór
Woda ≤ 15,0%
Czystość 96,0 - 100,5% (w przeliczeniu na suchą masę) - https://pol-aura.pl/ampicyliny-3-hydrat-7177-48-2-p-2263.htm...