China GMP Yinqiao Powder Veterinary Grade API for Multiple Dosage Forms

When Aqueous Injection Requires Terminal Sterilisation, Precipitation Control Becomes the Critical Path

Aqueous injections based on Yinqiao Powder Veterinary Grade API impose constraints absent from oral powders. The extract contains alcohol-soluble aglycones, free polysaccharides and protein-tannin conjugates; after reconstitution in Water for Injection at 37 °C, the solution is chilled to 4 °C for 12 h to force flocculation of high-molecular-weight substances. Clarification proceeds through a 0.45 µm polyethersulfone capsule followed by a 0.22 µm PVDF membrane at 1.5–2.0 bar. The pH is held at 5.5–6.5 with 0.1 M citric acid or sodium hydroxide because tannin aglycones precipitate rapidly below pH 5.0 and oxidative browning accelerates above pH 7.0. Terminal sterilisation at 121 °C for 15 min is reserved for preservative-free single-dose vials of 10 mL type I borosilicate glass with chlorobutyl stoppers; headspace nitrogen pressure is maintained at 0.5 bar positive. Bacterial endotoxins must be controlled before final filtration because raw herbal extract can carry Gram-negative residues; the intravenous acceptance limit is set at <0.5 EU/mg by Ph. Eur. 2.6.14, and routine batches are tested after 1:10 dilution to overcome matrix interference. Sub-visible particulate matter is measured after terminal sterilisation by light obscuration under Ph. Eur. 2.9.19; counts above 25 particles/mL at 10 µm or 3 particles/mL at 25 µm trigger filtration-failure review. Published data on the degradation of forsythin and volatile monoterpenes during terminal sterilisation in this exact configuration is limited, so forced degradation studies are required for each new extract lot before release.

What Drives Coefficient of Variation in Low-Inclusion Swine Premix When Yinqiao Powder Is Added Before Fat Coating?

At feed mills the primary failure is physical rather than chemical: spray-dried Yinqiao extract has a bulk density of 0.35–0.55 g/cm³, while the limestone carrier can exceed 1.20 g/cm³. When the API is discharged directly into a 2,000 kg ribbon mixer with calcium carbonate, segregation after 15 min can produce coefficient of variation above 15%, especially if the premix is pneumatically conveyed to the coating line. The preferred sequence is two-stage dilution: a 5 wt% intermediate is prepared by blending the API with milled rice hulls or calcium carbonate in a 150 L paddle mixer for 10 min; this intermediate is then added to the final swine premix at 1–3 kg/tonne feed and mixed for 8 min before soybean oil coating at 0.5 wt%. Sampling after the conveyor screw but before the pellet conditioner must show chlorogenic acid RSD <10% across 12 points by a validated HPLC method under ICH Q2(R1). The premix is conditioned at 65–75 °C for 30–45 s; above 85 °C, chlorogenic acid losses can exceed 10% in high-moisture meal. Regulatory classification determines the compliance path: medicated feed intermediates in the EU fall under Regulation (EU) 2019/4, while complementary feed positioning requires Regulation (EC) No 1831/2003 and Directive 2002/32/EC contaminant limits. Retention samples are held at 25 °C/60% RH for 24 months; moisture migration from choline chloride should be excluded from the same premix because extract hygroscopicity increases caking at RH > 60%.

Oral granules for piglet and calf dosing are produced by wet granulation rather than direct powder drenching because dry extract carrying particles above 710 µm produces dose-splitting in oral dosing syringes at volumes above 20 mL. The binder system is 5% w/v povidone K30 in purified water sprayed at 30–40 g/min into a 100 L high-shear granulator containing 25–35 wt% Yinqiao Powder Veterinary Grade API, 35–45 wt% lactose monohydrate, 20–25 wt% maize starch and 2 wt% crospovidone. Impeller speed is 300 rpm and chopper speed is 1,500 rpm; wet massing is limited to 90–120 s to prevent overwetting and granule collapse. The wet mass is discharged through a 2.0 mm screen and dried in a fluid-bed dryer at inlet 60 °C and product temperature 35–40 °C until loss on drying reaches 2.5–4.0% by USP <731>. Granule size distribution under Ph. Eur. 2.9.12 is maintained at 20–40% retained on 710 µm, 55–70% on 180 µm, and fines below 125 µm limited to <10%. Each sachet is filled under nitrogen at 100–120 g net weight and sealed with polyethylene/aluminium/PET trilaminate. The terminal granule must disperse in water at 37 °C within 3 min without floating aggregate; absence of a harmonised dissolution test for this herbal product requires internal comparison of chlorogenic acid release at 30 min across batches.

Direct Compression of Herbal Extract Boluses Exceeds Conventional Excipient Limits

Tableting of Yinqiao Powder Veterinary Grade API for adult ruminant boluses is constrained by low compactibility and moisture uptake. The as-received extract is pre-dried in a vacuum shelf dryer at 40 °C and −0.08 MPa for 4 h when water activity exceeds 0.45; the processing suite is held at 20–25 °C and 35–40% RH. A directly compressible formulation contains 35–45 wt% API, 35–45 wt% microcrystalline cellulose PH102, 5 wt% crospovidone, 5 wt% silicified microcrystalline cellulose and 0.5 wt% magnesium stearate. Blending is performed in a 300 L V-blender at 12 rpm for 8 min, with magnesium stearate added in the final 2 min to limit shear-induced hydrophobicity. Compression on a 16-station rotary press with 10 mm flat-faced bevel tooling is targeted at 8–11 kN; above 12 kN, capping occurs in more than 6% of tablets when the API lot contains ≥4.0% moisture. Tablet hardness is maintained at 70–90 N, friability ≤1.0% by USP <1216>, and disintegration ≤15 min in 900 mL water at 37 °C by Ph. Eur. 2.9.1. The finished bolus is packed in aluminium foil blisters at 5 g target weight; break-mark cross-scoring is not recommended because herbal extract tablets fragment unevenly at this compression force.

Hard-gelatin and HPMC capsules for companion animals use the roller-compacted fraction of the same Yinqiao Powder Veterinary Grade API because raw spray-dried powder has flow index below 3.0 and cannot be filled directly on dosator machines without weight variation above 5%. The extract is first roller-compacted at roll gap 2.0 mm and pressure 80–120 bar, then milled through a 1.0 mm conical screen with rotor speed 200 rpm. The granules are blended with 0.5 wt% magnesium stearate and filled into size 1 HPMC capsules on an intermittent dosator machine at 12,000 capsules/hour; target fill weight is 350 mg ± 5%. Capsule shell moisture is controlled at 12–14% for gelatin or 5–7% for HPMC, and filling-room RH is held at 40–50% to prevent shell brittleness and extract moisture uptake. Disintegration is run on 6 capsules per batch in 900 mL water at 37 °C using discs, with Ph. Eur. 2.9.1 limit of ≤15 min. The terminal capsule is packed in PVC/PVDC blister; a desiccant canister is added when 6-month stability data show LOD drift above 0.5%. Because this API is not a single chemical entity, assay variability is controlled by marker content rather than total extract weight, and each batch must include both chlorogenic acid and forsythin release data.

Small-Volume Oral Solution Rheology in HDPE Bottle Filling Lines

Oral solutions require different process limits than injection or dry powder. A representative 100 mL oral drench uses 10% w/v Yinqiao Powder Veterinary Grade API, 20% glycerol, 0.1% potassium sorbate, 0.05% sodium metabisulphite and purified water; the pH is adjusted to 4.5–5.5 with citric acid because chlorogenic acid undergoes ester hydrolysis above pH 6.5 at room temperature. Viscosity is measured on a Brookfield LV viscometer at 30 rpm and 20 °C; the target range is 150–250 mPa·s, and batches above 300 mPa·s are rejected because filling nozzles on 12-head volumetric lines drip after shutoff. The liquid is passed through 0.45 µm nylon mesh before filling, but static settling of fine herbal particles still occurs within 72 h; the label therefore instructs shaking before use. Bottles are 100 mL HDPE with induction-sealed polypropylene closures; oxygen transmission rate of HDPE is acceptable only below 40 cm³/(m²·24 h·bar) at 23 °C because oxidative browning accelerates above this level. Terminal pasteurisation at 85 °C for 20 min is used when the microbial challenge study demonstrates log reduction ≥5 for Escherichia coli and Staphylococcus aureus; heat-sensitive formulations are filled under ISO 14644-1 Class 8 cleanroom conditions with the preservative system instead of pasteurisation. Published data on the interaction between sodium metabisulphite and the flavonoid fraction of Yinqiao Powder is limited, so each batch must complete a 30-day accelerated browning test at 40 °C/75% RH.

Yinqiao Powder Veterinary Grade API, model YQ-VET-API-2405, is a standardized spray-dried extract prepared from the characteristic botanical mixture of Lonicera japonica, Forsythia suspensa, Mentha haplocalyx, and fermented Glycine max. The manufacturing sequence uses aqueous ethanol at a solvent-to-herb ratio of 8:1, vacuum concentration at 55–60°C, and spray drying at an inlet temperature of 170–185°C and outlet temperature of 80–90°C. The API is intended for further manufacture into veterinary tablets, injections, capsules, powders, granules, premix, and solutions; it is not supplied as a sterile finished dosage form. The release specification establishes limits for marker content, residual moisture, ash, heavy metals, microbial burden, and particle-size distribution. Chlorogenic acid is controlled at 2.0–2.8% and forsythin at 0.8–1.2% by high-performance liquid chromatography. Loss on drying is ≤ 5.0% per USP <731>; total ash is ≤ 5.0% per USP <561>; lead is ≤ 5 ppm, arsenic ≤ 2 ppm, cadmium ≤ 1 ppm, and mercury ≤ 0.1 ppm by USP <233> inductively coupled plasma mass spectrometry. Total aerobic microbial count is ≤ 1000 CFU/g, total yeast and mold count ≤ 100 CFU/g, and Escherichia coli is absent in 1 g per USP <61> and USP <62>. Residual solvents meet USP <467> Class 3 limits. Moisture sorption at 25°C shows 8–12% uptake at 80% RH; at 60% RH, the powder gains more than 3.0% within 48 h, requiring aluminum foil laminate packaging with silica gel desiccant.

Powder X-ray diffraction shows an amorphous halo for the spray-dried product. Modulated differential scanning calorimetry per ISO 11357-2:2020 indicates a glass transition temperature in the range 58–65°C for the standard grade. This thermal boundary is relevant for fluid-bed granulation and tableting because prolonged exposure above the glass transition leads to particle fusion and loss of compressibility. Scanning electron microscopy shows collapsed spherical particles typical of spray-dried botanical extracts, with a D10 of 12–18 µm, D50 of 32–40 µm, and D90 ≤ 75 µm for the standard grade. The Hausner ratio is 1.24–1.30, and the Carr index is 19–23%, consistent with fair-to-passable flow for direct compression formulations. The carrier is maltodextrin at 5–10% of total solids for standard and granulated grades; injection-grade material uses mannitol at 5–15% as a bulking agent.

What Distinguishes This Veterinary-Grade API From Crude Yinqiao Powder?

Crude Yinqiao powder is produced by mechanical comminution of dried botanical material. Its marker content varies with harvest location, drying history, and sieve cut. The veterinary-grade API is produced by controlled solvent extraction, concentration, and spray drying; this sequence removes fibrous plant matrix and concentrates the phenolic and lignan marker fraction. Unlike synthetic antipyretic small-molecule APIs, this material is characterized by marker assay rather than absolute purity because the extract contains multiple constituent groups. The comparison in Table 1 is based on release testing of three consecutive commercial lots on a 500 kg spray-drying line and equivalent crude powder samples. Published data for this specific configuration is limited to manufacturer lot records; external regulatory monographs do not provide a harmonized marker specification for Yinqiao Powder, so the API specification is established as an in-house release criterion.

Parameter	YQ-VET-API-2405 specification	Crude Yinqiao powder	Test method
Chlorogenic acid	2.0–2.8%	0.3–1.1%	USP <621> HPLC
Forsythin	0.8–1.2%	0.1–0.4%	USP <621> HPLC
Particle size D90	≤ 75 µm	180–400 µm	ISO 13320:2020
Bulk density	0.42–0.52 g/mL	0.28–0.38 g/mL	USP <616> Method I
Total ash	≤ 5.0%	9–14%	USP <561>
Total aerobic microbial count	≤ 1000 CFU/g	> 10,000 CFU/g	USP <61>
Escherichia coli	Absent in 1 g	May be present	USP <62>
Bacterial endotoxin	≤ 0.25 EU/mg	Not controlled	USP <85>

The marker ratio of chlorogenic acid to forsythin is controlled between 1.7:1 and 3.5:1 by extract blending before spray drying. This lot-to-lot control strategy is a functional difference from simple botanical powders and from single-molecule synthetic APIs. Because the material is a multi-component botanical extract, dissolution modeling and finished-product assay cannot rely solely on one analyte, and the marker ratio should be retained as a release fingerprint. For suppliers using solvent extraction exclusively, the extraction solvent history should be confirmed; peroxide-containing ethanol above 5 ppm may accelerate oxidation of chlorogenic acid during storage.

On rotary tablet presses, direct compression is performed with a 16-station instrumented press at 40–60 rpm. The API is pre-dried at 50°C for 2 h before use. Compression at 8–12 kN produces tablets with hardness 5–8 kp and friability ≤ 0.8% when room humidity is maintained below 60% RH. Above that threshold, moisture plasticization of the amorphous spray-dried matrix causes capping at hardness values above 8 kp. Capsule filling on a semi-automatic dosator machine at 70% target fill weight yields weight variation ≤ 4% for size 0 hydroxypropyl methylcellulose capsules. Disintegration testing per USP <701> is ≤ 15 min when croscarmellose sodium is included at 3.0%. Uniformity of dosage units should be evaluated according to USP <905> because the spray-dried material exhibits slight cohesiveness at low compression force.

Granulation uses a top-spray fluid-bed unit at an inlet air temperature of 60–65°C, product temperature of 38–42°C, and spray rate of 15–25 g/min per kilogram of API. The binder solution is polyvinylpyrrolidone K30 at 5.0–8.0% by weight. The granules have ≥ 85% retained between 20 mesh and 80 mesh, with fines below 100 mesh limited to ≤ 5%. For premix production, the granulated API is blended with feed-grade corn cob or rice hull carriers at 1–10 kg per tonne of finished premix in a ribbon blender. Segregation testing according to ASTM D6940-10 may be applied, but published data for this specific configuration is limited. If mineral premixes contain free transition metals, the polyphenolic fraction may chelate metal ions and accelerate oxidative discoloration, so a compatibility hold test at 40°C and 75% RH is recommended before full-scale production.

Sieve-Cut and Bulk-Density Specifications Across Dosage Lines

Physical grade selection depends on the target dosage form. A standard grade with D90 ≤ 75 µm and bulk density 0.42–0.52 g/mL is used for direct compression and capsule filling. A jet-milled injection-grade material with D90 ≤ 45 µm has a lower bulk density of 0.38–0.45 g/mL and a higher measured specific surface area of 2.8–3.5 m²/g by nitrogen adsorption using ISO 9277:2022. The jet-milled fraction is significantly more hygroscopic and must be dispensed under ≤ 40% RH to avoid agglomeration. For premix and granule operations, a compacted granular API retained between 40 mesh and 100 mesh reduces dust and improves ribbon blend uniformity. Table 2 provides a grade-to-dosage-form matrix.

Dosage form	API grade	Critical physical parameter	Equipment/standard
Tablets	Standard spray-dried	Hausner ratio 1.24–1.30; D90 ≤ 75 µm	16-station rotary press
Capsules	Standard spray-dried	Bulk density 0.42–0.52 g/mL; moisture ≤ 3.0%	Semi-automatic dosator
Granules	Top-spray granulated	≥ 85% retained between 20–80 mesh; fines ≤ 5%	Fluid-bed top-spray unit
Premix	Compacted granular	40–100 mesh; dust ≤ 2%	Ribbon blender
Injection solution	Jet-milled injection-grade	Endotoxin ≤ 0.25 EU/mg; D90 ≤ 45 µm	0.22 µm PVDF membrane
Oral solution	Standard or jet-milled	pH 5.0–6.5; clarity after 0.45 µm filtration	High-shear mixer

When Aqueous Injection-Grade Material Is Required, What Limits Formulation?

After reconstitution in water for injection, the jet-milled API yields a hazy suspension. Clarification through 0.45 µm and 0.22 µm PVDF membranes is required, and the filtration step should be operated with differential pressure below 1.0 bar to avoid fouling from the lipophilic fraction. A co-solvent system containing propylene glycol at 10–20% v/v and polysorbate 80 at 0.5–1.0% v/v maintains clarity at 2–8°C for 24 h in short-term stability screening. The pH of the injection solution should be 5.0–6.5; at pH 4.0 or below, hydrolysis of phenolic esters is accelerated, and at pH 7.5 or above, oxidative browning occurs with an assay loss of 8–12% for chlorogenic acid over 72 h at 25°C exposed to light. Terminal sterilization at 121°C for 15 min is not recommended without forced-degradation verification because marker content may decrease by more than 10%. Aseptic filtration through a 0.22 µm sterilizing-grade membrane is the preferred method when the finished dosage form must meet sterility per USP <71>.

Lyophilized injection-grade material uses mannitol at 5–15% of total solids as a bulking agent. The lyophilization cycle includes freezing to −35°C, primary drying at −10°C under 50 Pa for 24 h, and secondary drying at 25°C for 6 h. Differential scanning calorimetry per ISO 11357-2:2020 is used to confirm the absence of a detectable crystalline unfrozen fraction; collapse is an observed failure when the primary drying temperature exceeds −5°C. The reconstituted product should be used within 6 h when stored at 25°C, because phenolic marker degradation progresses in aqueous solution. Particulate matter after reconstitution should be evaluated according to USP <788> for small-volume injections, because the spray-dried matrix may contribute subvisible particles if filtration is incomplete.

Combination with synthetic antipyretic or antibiotic APIs requires compatibility screening because the polyphenolic fraction can chelate metal ions from mineral premixes and may alter the dissolution profile of basic drugs. Blending with amine-based excipients should be avoided at moisture uptake above 3%, because Maillard-type browning has been observed at 40°C and 75% RH within 7 days. The finished product assay and impurity monitoring should use a stability-indicating HPLC method validated according to ICH Q2(R1) for linearity, precision, and accuracy. The API is not intended for direct administration without formulation and is supplied as a non-sterile bulk material except for the injection-grade fraction that has been subject to endotoxin control but not terminal sterilization. Batch-to-batch marker content variance is controlled to within ± 10% of label claim across three consecutive commercial lots of 500 kg spray-dried material, based on manufacturer release records. Long-term stability data for this specific configuration in all listed dosage forms is limited, and formulators should qualify each finished product under 25°C and 60% RH conditions before assigning shelf life.

HS Code	906605
Product Name	Yinqiao Powder Veterinary Grade API for Tablets / Injections / Capsules / Powders / Granules / Premix / Solutions
Product Category	Veterinary API (Active Pharmaceutical Ingredient) based on traditional Chinese veterinary medicine formula
Active Ingredients	Honeysuckle, Forsythia, Mint, Schizonepeta, Prepared Soybean, Burdock, Platycodon, Lophatherum, Licorice, and Phragmites
Physical Appearance	Brown to yellowish-brown powder with a characteristic aromatic odor and slightly bitter taste
Solubility	Partially soluble in water, forming a colloidal or suspended mixture when dissolved
Dosage Form Compatibility	Compatible with production of tablets, injections, capsules, powders, granules, premixes, and oral solutions
Primary Indications	Wind-heat cold, fever, respiratory infections, inflammatory conditions, and epidemic diseases in livestock and poultry
Pharmacological Actions	Clearing heat, detoxifying, dispelling wind-heat, antipyretic, anti-inflammatory, antiviral, and antibacterial activities
Target Species	Pigs, cattle, sheep, goats, chickens, ducks, geese, and other livestock and poultry
Administration Route	Oral administration through feed or water, or via prepared dosage forms; injectable route when formulated under veterinary guidance
Safety Profile	Low toxicity, generally well-tolerated in veterinary use, with no significant adverse effects at recommended dosages
Storage Conditions	Keep in airtight, moisture-proof containers in a cool, dry place, protected from light and high temperature
Shelf Life	24 months under recommended storage conditions
Quality Standard	Meets veterinary pharmacopoeia requirements for API purity, microbial limits, and heavy metal content

Packing	Yinqiao Powder veterinary-grade API is packaged in 25 kg sealed double-layer polythene bags inside fiber drums, ensuring safe, stable delivery for pharmaceutical production.
Container Loading (20′ FCL)	20′ FCL loading of Yinqiao Powder veterinary API: drummed, palletized, securely stowed, with proper segregation and ventilation to ensure cargo safety.
Shipping	Yinqiao Powder Veterinary Grade API is shipped in sealed, tamper-proof containers to preserve stability and potency. Transport complies with international regulations for pharmaceutical powders, with full documentation, traceability, and temperature-controlled logistics available. Proper labeling and safe handling protocols ensure secure delivery for tablet, injection, capsule, powder, granule, premix, or solution manufacturing.
Storage	Store in a tightly sealed, light-resistant container in a cool, dry, well-ventilated area at controlled room temperature (15–30°C). Protect from moisture, direct sunlight, and extreme heat. Keep away from oxidizing agents and incompatible materials. Ensure container remains closed when not in use to preserve purity, potency, and stability throughout shelf life.
Shelf Life	Shelf Life: 24 months in original sealed containers, stored in a cool, dry place away from light and moisture.

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Yinqiao Powder Veterinary Grade API for Tablets / Injections / Capsules / Powders / Granules / Premix / Solutions