Quality Control in Pharmaceutical Packaging: Methods and Emerging Trends

Abstract

Packaging is crucial for maintaining the quality, safety and stability of pharmaceutical products by protecting them from moisture, gases, microbes and other environmental factors. Materials used includes glass, plastic, paper, metal and sealing components such as cork, rubber and aluminium. Traditional QC methods focus on ensuring container closure integrity and protection against environmental factors Advanced nondestructive methods are reshaping the way packaging is evaluated in line with emerging trends. The adoption of smart packaging with sensors enables real time monitoring of temperature, humidity and tampering, enhancing patient safety. Overall pharmaceutical packaging QC is shifting from traditional methods towards sustainable, intelligent, and automated solutions ensuring robust protection of medicines while supporting innovations and regulatory expectations.

Keywords

Introduction

Fig 1. Represents the traditional and new emerging trends in pharmaceutical packaging

Quality Control Test For Glass Container

1. Crushed–Glass Test :

The principle involved in the powdered glass test estimate the amount of alkali leached from the powdered glass which usually happens at the elevated temperatures²

Rinse glass containers with purified water → Dry

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Grind dried containers in mortar → Pass through sieve no. 20 → Collect portion passing sieve no. 50

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Weigh 10 g of powdered glass

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Wash with acetone → Dry

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Add 50 ml purified water to dried sample

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Autoclave at 121°C for 30 minutes

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Cool → Decant liquid

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Using methyl red as an indicator, carry out titration of the decanted liquid with 0.02 N H?SO?

Record the burette reading of acid used, then determine the alkali leached.

2. Hydrolytic resistance of glass containers:

The resistance to the release of     soluble mineral compounds into water under the specified conditions of contact between the inner surface of the container or glass grains and water is a measure of the hydrolytic stability of glass containers used in pharmaceutical applications.

Rinse containers three times with CO?-free water

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Fill with CO?-free water to filling volume

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Cover vials/bottles

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Autoclave at 100°C for 10 min

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Increase temp from 100°C → 121°C over 20 min

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Maintain 121–122°C for 60 min

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Cool containers

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Combine liquids → Measure total volume

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Titrate with 0.01 M HCl using methyl red

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Record acid volume → Determine hydrolytic resistance

3. Water Attack Test

It is only utilized for containers subjected to SO? fumes in controlled humidity settings. The glass is now more resistant to chemicals. The Water Attack Test's basic idea is to determine whether the amount of alkali that leaks from the container's surface stays within predetermined bounds. The full container (ampoule) must be used because the inner surface is being tested.      

Rinse containers thoroughly with high-purity water

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Each container is to be filled with water to 90% of the overflow volume

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Autoclave at 121°C for 30 minutes

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Cool containers

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Decant liquid

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Titrate decanted liquid with 0.02 N H?SO? using methyl red indicator

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Measure volume of acid consumed

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Determine amount of alkaline oxides present in glass

4. Arsenic Test :

Glass containers used for aqueous parenterals are subject to this test. By turning the arsenic in a sample under test into arsine and passing it through a solution of silver diethyldithiocarbamate to create a red complex, this process is intended to detect the presence of trace levels of arsenic.

Wash inner and outer surfaces of container with fresh distilled water for 5 minutes

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Repeat steps of hydrolytic test until final combined solution is obtained

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Pipette 10 ml from the final combined solution

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Add 10 ml HNO? to the sample

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Dry in oven at 130°C

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Add 10 ml hydrogen molybdate solution

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Reflux for 25 minutes

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Cool the solution

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Measure absorbance at 840 nm

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Compare absorbance to standard:  Test absorbance < absorbance from 0.1 ml of arsenic standard (10 ppm)

5. Thermal Shock Test 

The practice of rapidly transferring a product between two extremely high and low temperatures in order to determine its durability and pinpoint possible breaking points is known as thermal shock testing. The purpose of this testing is to simulate, in a more rapid setting, the wear and tear that a product would experience under normal circumstances or with regular use.²

Place samples upright in a tray

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Immerse tray in hot water for specified time

(temperature controlled)

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Transfer immediately to cold water bath (temperature controlled)

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Inspect bottles for cracks or breaks before and after the test

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Note: Thermal shock resistance depends on bottle size, design, and glass distribution ↓

Typical performance:

• Small bottles: withstand 60–80°C temperature difference
• 1 point bottles: withstand 30–40°C temperature difference

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Standard test: uses ~45°C temperature difference between hot and cold baths

6. Internal Bursting Pressure Test 

Burst is a condition where internal pressure exceeds pressure loading. Burst can happen in several situations, such as well control, pressure test casing/tubing, pumping operation, etc.

Fill test bottle with water

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Place bottle inside test chamber

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Apply sealing head

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Increase internal pressure in increments

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Hold each pressure increment for a set time

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Continue test until:

• Preselected pressure level is reached, or
• Bottle bursts

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Record burst pressure

Quality Control Test For Plastic Container

1. Leakage Test : One popular technique for leak testing is air leak testing. It is an adaptable test technique that may be applied to a broad range of components and uses.

Ten water-filled  containers  with  the proper closures are  installed.

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For a full day, they are stored upside down at room temperature.

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If there are no indications of leakage from any containers, the test is considered successful.

2. Clearity of Aqueous Extract

Select a suitable container at random

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Choose unlabeled, unmarked, non-laminated portions

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Cut selected portions into strips (surface area < 20 cm² each)

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Wash strips to remove extraneous matter:

Shake with ≥ 2 separate portions of distilled water (30 sec each)

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Transfer processed strips into a clean flask

(Flask pre-cleaned with chromic acid and rinsed with distilled water)

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Add 250 ml distilled water to flask

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Cover flask and autoclave at 121°C for 30 minutes

Quality Control Test For Closures

1. Penetrability test: This is used to determine how much effort is needed to allow a hypodermic needle to pass through the closure with ease. A piercing machine is used to measure it. The measurement is done with a piercing machine. The piercing force has a set limit. If it surpasses that specified amount, the hypodermic needle may sustain damage due to the closures' unfavorable hardness.³

2. The fragmentation test: 20 closures are subjected to this test. In a piercing machine, a hypodermic needle is used to puncture each closure five times in a small area. Any fragments are then transferred by washing the needle. The pieces are tallied after the contents are filtered through colored paper that contrasts with the rubber. Generally speaking, each unit should have no more than three pieces. 

3. Extractive test: In this test, water is boiled with the closure for four hours while it is refluxing, and the water is then evaporated until it is completely dry. The residue cannot be more than what is required.

4. Compatibility test: This test makes sure that there is no contact between the closure and the contents of the bottle by determining if rubber closures are compatible with different kinds of substances. 

5. Light absorption : Use a membrane filter to filter solution A. Measure the filtrate's light absorbance between 220 and 360 nm using a blank solution that has been made identically to solution A. There is not more absorption than 2.

WHO Guidelines for Quality Assurance of Packaging Materials

All containers and closures intended for use must comply with the requirements of the Pharmacopoeia and relevant regulatory standards. Appropriate specifications, quality standards, cleaning, and sterilization procedures must be strictly followed. Packaging materials, including plastic granules, must meet pharmacopoeial requirements for physical, chemical, and biological testing.

Before use, all containers and closures should be washed with water for injection according to documented sterilization protocols. Sealing, capping, and stoppering should ensure an airtight closure without compromising product quality. Containers and lids selected for specific products must not interact adversely with the contents.

For glass bottles, a maintenance program should be implemented. Containers for injections and ophthalmic preparations should be inspected in diffused light against a black background to ensure they are free from visible foreign matter. Glass bottles must have appropriate shapes and designs and should be made from USP Type I or Type II glass. USP Type III glass may be used for sterile, non-parenteral products.

For plastic containers, manufacturing should be carried out internally using automated machinery. Molding, sealing, and filling operations must be performed in equipment that meets regulatory guidelines. For rubber stoppers used in large containers, the requirements of the Indian Pharmacopoeia must be followed.⁴

Current Trends In Pharmaceutical Packaging

The pharmaceutical packaging industry is undergoing a rapid transformation, driven by rising market demand and the push for smarter, safer solutions. Between 2024 and 2032, the global market is forecast to grow from $110.55 billion to $176.94 billion, at a strong CAGR of 6.06%. This growth isn’t simply due to more medicines being produced—it’s fueled by the complexity of modern treatments, particularly biologics and personalized therapies, which require packaging that does far more than just hold a product.

Multiple forces are propelling this change:

• Regulatory demands: Stricter and evolving rules are prompting manufacturers to adopt packaging that ensures traceability, tamper resistance, and patient safety—especially for high-value or high-risk drugs.
• Therapeutic advances: The surge in biologics and other sensitive therapies calls for packaging that can protect stability and potency throughout the supply chain.
• Patient-focused design: User-friendly features such as easy-open systems, integrated dosing tools, and clear labeling improve adherence and safety, particularly for older adults or those with chronic conditions.
• Global supply chain expansion: With medicines traveling farther and crossing diverse climates and regulations, packaging must be adaptable to a variety of environments and compliance standards.⁵

Recent Packaging Technologies

1. Aseptic Blow-Fill-Seal (BFS) technology is an advanced packaging process in which plastic containers are formed, filled with sterile-filtered products, and sealed in a single, continuous operation within a controlled sterile environment. Recognized globally for its high sterility assurance and operational efficiency, BFS offers several advantages over conventional aseptic methods, including flexible container design, reduced operating costs, minimal staffing requirements, and compact equipment footprint. It supports multiple polymers such as low- and high-density polyethylene and polypropylene, enabling customized packaging solutions that improve usability and integrate easily with modern drug delivery systems, particularly in respiratory therapy.
2. Counterfeit prevention in pharmaceuticals relies heavily on advanced packaging technologies to ensure product authenticity and supply chain security. Techniques include microtext, embossing, holograms, tamper-evident seals, and customized graphics. Ink-based security features reveal hidden colors when rubbed, while RFID tags provide authentication, product tracking, and pedigree record maintenance.  
   1. Holograms: This anti-counterfeiting technology uses logos, nano-text, and hidden graphics visible only to experts, with high-quality holograms and invisible markers adding extra security.
   2. Tamper-evident stickers: are made from cellulose acetate film, which shatters into small fragments if removed. They can be easily applied using automatic dispensers. Though vinyl is cheaper, acetate is still used for specialized needs.
   3. Sequential product numbering: assigns each product a unique number in ascending or descending order to aid counterfeit detection, though it can be predicted or copied.
   4. On-product marking: uses unique images or codes on dosage forms, effective if packaging remains intact.
   5. Invisible printing: employs special inks visible only under UV or IR light, changing color with wavelength.
   6. Embedded images: reveal hidden graphics through special filters, resistant to standard scanning.
   7. Digital watermarks: hide data in visuals, readable by scanners or mobile devices but invisible to the eye.
   8. Hidden marks and printing: place discreet, hard-to-replicate images on products.
   1. Anti-copy/ anti-scan designs: use background patterns that reveal concealed images after scanning, requiring specialized laser coding tools.⁶
3. Child-resistant (CR) packaging Closures easy-to-open designs can increase the risk of accidental child consumption. To address this, child-resistant closures have been developed, requiring multiple simultaneous actions—such as turn-and-push, squeeze-and-lift, turn-and-lift, or squeeze-and-turn—that are difficult for children to perform, thereby enhancing safety.
   1. Tamper-Evident Containers: These containers prevent leaks, tampering, and unauthorized access, playing a vital role in child-resistant packaging by reducing the risk of accidental misuse.
   2. Blister and Strip Packaging: In blister packs, individual doses are sealed in aluminum cavities. Variations include:
   3. Side Squeeze: Applying pressure to the sides releases the blister.
   4. Press and Pull: Pressure on the upper section unlocks the pack to remove the blister.
   5. Combination Lock: To release the tablet, the cavity and exit point must be precisely aligned.
   6. Pill Closure: Designed for larger adult hands to open, making it harder for children to access the contents.
4. Intelligent packaging is a form of smart packaging that uses both internal and external indicators to provide information about changes in a product or its surrounding environment. By incorporating technologies such as barcode labels, biosensors, time–temperature indicators, oxygen and carbon dioxide sensors, microbial growth detectors, pathogen indicators, and gas sensors, intelligent packaging continuously monitors product conditions and communicates valuable safety and quality insights to consumers.
   1. Time–Temperature Indicators (TTI): TTIs provide a comprehensive temperature history during distribution by monitoring changes in mechanical, chemical, or enzymatic processes.  For example, a shift in ambient temperature that alters product quality can cause the indicator to change color—from red to green—offering a simple visual cue of the product’s freshness and safety.
   2. Gas Concentration Indicators: These indicators detect changes in the internal gas composition of a package caused by chemical or enzymatic reactions. Oxygen indicators shift color (e.g., from pink to blue) when oxygen is present, while carbon dioxide indicators are used in packages requiring high CO? levels. Such tools enable quick quality checks and ensure products are repackaged or stored under optimal conditions.⁷

Fig 2. Represent different emerging packages in pharmacy

4. Patient Compliance through Specialized Packaging

 Patient compliance is a critical factor in the pharmaceutical industry, directly influencing the effectiveness of treatments. Accurate and consistent medication intake is essential for achieving optimal therapeutic outcomes, prompting the development of innovative packaging solutions that ensure dose accuracy, proper administration, and adherence to prescribed regimens.

For visually impaired patients, medication management poses significant challenges, leading to risks of dosage errors and reduced independence. Solutions under development include Braille labeling, NFC tags, and talk packs to improve accessibility.

• Braille Labeling: Introduced in 1829 by Louis Braille, this tactile system of raised dots allows blind patients to identify medications, dosage details, and expiration dates by touch.
• 3D-Printed Tablets (Printlets): Using selective laser sintering (SLS), tactile Braille or moon patterns can be directly embedded into tablets, enabling visually impaired individuals to identify and self-administer medications accurately, reducing the risk of errors.
• NFC Tags: Developed by VTT Technical Research Centre, these short-range wireless devices can be embedded in pharmaceutical packaging. When tapped with an NFC-enabled phone, they provide accessible medication information in audio, text, or web formats—particularly beneficial for blind or visually impaired users.⁵

5. Improving Patient Compliance in Alzheimer’s Disease

Alzheimer’s disease, a leading cause of medication non-adherence in older adults, demands patient-friendly solutions. Calendar-integrated prescription packs help patients and caregivers track doses, providing a clear visual reminder aligned with daily or weekly schedules. This simple yet effective packaging innovation supports adherence, eases medication management, and enhances overall care for individuals living with Alzheimer’s.⁴

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