CANNABIS SCIENCE WEB-APP CALCULATOR

THC-to-CBN Degradation & Shelf-Life Stability Calculator.

Model first-order THCA and Delta-9 THC oxidative degradation into Cannabinol (CBN), check compliance with the Ph. Eur. 3028 CBN <= 1.00% impurity ceiling and +/- 10% label-claim tolerance, and determine best-before dates across 4C, 20C, 25C, and 30C storage.

INSTRUMENT 14 // PH. EUR. 3028 SHELF-LIFE & CBN OXIDATION KINETICS

HPLC Cannabinoid Degradation & Shelf-Life Stability (THCA → Delta-9 THC → CBN) Calculator

Model first-order oxidative potency loss, Cannabinol (CBN <= 1.00% wt) impurity accumulation, and Ph. Eur. 3028 (+/- 10% label-claim tolerance) shelf-life expiration across cold-chain, ambient, ICH Zone II, and light-exposed storage.

Initial Batch Total THC (% wt at Harvest/Release)

Initial Baseline CBN (% wt, Ph. Eur. Limit <= 1.00%)

Storage Duration (Months, 1 to 24)

Storage Temperature & Packaging Environment

Stability & Expiration Diagnosis: STABLE BATCH TRAJECTORY: Projected Total THC remains within the Ph. Eur. 3028 90%-110% label-claim tolerance (-6.7% drop) and oxidative CBN (1.13% wt) is tracked against the 1.00% pharmacopoeial impurity ceiling.

Projected Total THC & +/- 10% Assay Window

20.53% Total THC (-6.7% loss // Max 90% Shelf Life: 9 mo)

Ph. Eur. 3028 Assay Window: 90.0% to 110.0% of Stated Label Claim

Projected Cannabinol (CBN) & Sedative Index

1.12% CBN (Ph. Eur. Limit <= 1.00% // Sedative Index: 5.5%)

Ph. Eur. 3028 Impurity Ceiling: CBN <= 1.00% wt | Aged Hash/Flos Marker

Overall Ph. Eur. 3028 & KCanG Par. 21 Expiry Verdict

PASS ASSAY WINDOW // MONITOR CBN OXIDATION (<= 1.0% LIMIT)

Verified via 11-Cannabinoid HPLC-DAD Including CBN (CA-LAB-01)

HPLC-DAD THC + THCA + CBN STABILITY // CA-LAB-01 (EUR 59) Order 11-Cannabinoid & CBN Stability Assay →

Ph. Eur. 3028 Cannabinoid Stability & Stoichiometric Reference Table

Starting Flower Weight	Raw THCA %	Total Raw THCA (mg)	Max Theoretical THC (0.877x)	Controlled PID + MCT Oil (~83% Net)	Open Kitchen Oven + Butter (~59% Net)	Per Serving (24 Portions)
3.5 g (Eighth)	18% THCA	630 mg	552.5 mg	457.5 mg THC	328.2 mg THC	19.1 mg (PID) vs 13.7 mg (Oven)
3.5 g (Eighth)	24% THCA	840 mg	736.7 mg	610.0 mg THC	437.6 mg THC	25.4 mg (PID) vs 18.2 mg (Oven)
7.0 g (Quarter)	20% THCA	1,400 mg	1,227.8 mg	1,016.6 mg THC	729.3 mg THC	42.4 mg (PID) vs 30.4 mg (Oven)
7.0 g (Quarter)	22% THCA	1,540 mg	1,350.6 mg	1,118.3 mg THC	802.2 mg THC	46.6 mg (PID) vs 33.4 mg (Oven)
14.0 g (Half Ounce)	22% THCA	3,080 mg	2,701.2 mg	2,236.6 mg THC	1,604.5 mg THC	93.2 mg (PID) vs 66.9 mg (Oven)
28.0 g (One Ounce)	25% THCA	7,000 mg	6,139.0 mg	5,083.1 mg THC	3,646.6 mg THC	211.8 mg (PID) vs 151.9 mg (Oven)

Frequently Asked Engineering Questions

Why does European Pharmacopoeia Monograph 3028 enforce both a +/- 10% THC assay window and a <= 1.0% CBN ceiling?

Under Ph. Eur. 3028 (Cannabis flos), a batch fails shelf-life stability if its Total THC drops below 90.0% of the stated label claim (a > 10% relative loss) OR if oxidative aromatization of Delta-9 THC pushes Cannabinol (CBN) above 1.00% wt, which alters the pharmacological profile toward heavy sedation.

How do German Social Clubs (Anbauvereinigungen) determine the mandatory KCanG Par. 21 best-before date (Mindesthaltbarkeitsdatum)?

When cured flower (0.55-0.62 aW) is stored in dark, hermetic, low-oxygen containers at 18C to 20C, first-order THC oxidation averages ~1.1% per month, yielding a validated 6-to-8-month shelf life before approaching the 10% potency loss or 1.0% CBN threshold.

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