#e-liquid

Black Diamond CBD by LitMistCo is a lab tested premium CBD blend crafted for purity, potency, and smooth results. Designed for quality-conscious users, it delivers reliable wellness support with rich flavor and clean extraction.

cooling agent ws-23, ws-3, ws-5...for making e-liquid

In the world of vaping, ensuring the safety of e-liquids is more important than ever. With regulations tightening around what can and can't be added to these products, substances like caffeine and taurine are strictly off-limits to protect users' health. But detecting both at the same time has been tricky because of their differing polarities. That's where our research comes in—we've developed a reliable method using high-performance liquid chromatography coupled with tandem mass spectrometry (HPLC-MS/MS) to measure these compounds simultaneously in e-liquids.

Abstract

To safeguard consumer health, e-liquids are prohibited from containing caffeine and taurine. However, simultaneously detecting these two compounds poses challenges due to their significant polarity differences. In this study, we screened and optimized chromatographic columns with various functional groups and separation conditions. By selecting a column that supports multiple separation modes, we established an HPLC-MS/MS method for the simultaneous determination of caffeine and taurine in e-liquids. Samples were extracted with a 50% acetonitrile aqueous solution, separated using acetonitrile and 0.1% formic acid aqueous solution (containing 10 mmol/L ammonium formate) as the mobile phase in gradient elution mode on a Phenomenex FMD Comixsil ACRP column (100 mm × 2.1 mm, 3.0 µm). Detection was performed via tandem mass spectrometry in multiple reaction monitoring (MRM) mode, with quantification by external standard method.

The results showed excellent retention and peak shapes for both caffeine and taurine, with no tailing. Caffeine exhibited good linearity in the range of 1.00–100 µg/L (r = 0.997), while taurine showed linearity from 10.0–1,000 µg/L (r = 0.998). The limits of detection (LOD) were 0.100 mg/kg for caffeine and 1.00 mg/kg for taurine, with limits of quantification (LOQ) at 0.250 mg/kg and 2.50 mg/kg, respectively. At three spiking levels (1×, 2×, and 10×), recoveries ranged from 88.2% to 99.0%, with relative standard deviations (RSD) of 2.2%–6.6% (n=6). This method is straightforward, rapid, and highly sensitive, providing valuable technical support for e-liquid quality regulation.

Sample Preparation

Getting the sample ready is a crucial first step, and we've kept it simple to make the process efficient. Weigh approximately 0.20 g of e-liquid sample (accurate to 0.001 g) into a container. Add 50 mL of 50% acetonitrile aqueous solution, vortex for 1 minute to mix thoroughly, then ultrasonicate for 15 minutes to extract the compounds. Filter the extract through a 0.22 µm polytetrafluoroethylene (PTFE) membrane, and the filtrate is ready for analysis. This approach ensures minimal hassle while maximizing extraction efficiency.

Analytical Conditions

Chromatographic Conditions

We used a Phenomenex FMD Comixsil ACRP column (100 mm × 2.1 mm, 3.0 µm) for separation—it's versatile and handles multiple modes well, which was key to our success. The mobile phase consisted of A: acetonitrile and B: 0.1% formic acid aqueous solution (containing 10 mmol/L ammonium formate). The gradient elution program was as follows:

0–2.0 min: 95% A

2.0–7.0 min: 95% A to 70% A

7.0–10.0 min: 70% A

Column temperature was maintained at 30°C, with a flow rate of 0.2 mL/min and an injection volume of 1 µL. These settings helped us achieve clean separations without any overlapping peaks.

Mass Spectrometry Conditions

For detection, we employed an electrospray ionization (ESI) source in positive ion mode, with multiple reaction monitoring (MRM). Nitrogen was used for nebulizer gas, drying gas, and heating gas. Key parameters included:

Curtain gas (CUR) pressure: 276 kPa (40.0 psi)

Nebulizer gas (GS1) pressure: 241 kPa (35.0 psi)

Auxiliary gas (GS2) pressure: 483 kPa (70.0 psi)

Electrospray voltage: 3.0 kV

Desolvation temperature (TEM): 350°C

Detailed mass spectrometry information for caffeine and taurine can be found in the original Table 1. This setup allowed for precise and sensitive detection, making sure we caught even trace amounts.

Conclusion

Finding the right E-Liquid can be overwhelming, especially with so many choices flooding the market. With 2025 just around the corner, the vaping world continues to evolve, offering new flavors, stronger nicotine formulations, and improved technology. Whether you're a beginner or an experienced vaper, selecting the right e-liquid is crucial for an enjoyable vaping experience.

In this article, we’ll cover expert recommendations for the best e-liquid brands of 2025. Whether you prefer fruity blends, menthol, dessert flavors, or something more exotic, we've got you covered. Premium brands like Bar Juice 5000, Dinner Lady, SKE Crystal, Elux, and Lost Mary are setting the bar for the best e-liquids of 2025.

What Makes a Great E-Liquid? Key Factors to Consider

Before diving into our expert recommendations, it's essential to understand what makes an e-liquid truly great. Here are the most important factors to consider when selecting your next vape juice:

Flavor Variety: A great e-liquid should offer a variety of flavors to suit your taste. From fruity blends to menthol, tobacco, and dessert-inspired options, there’s something for every vaper.

VG/PG Ratio: The VG/PG (Vegetable Glycerin/Propylene Glycol) ratio affects your vaping experience. Higher VG means larger clouds and a smoother hit, while a higher PG ratio delivers a more intense throat hit.

Nicotine Strength: Nicotine strength varies between brands and personal preference. Make sure to choose an e-liquid with a nicotine level that suits your needs, whether you’re looking for a light hit or a stronger experience.

Consistency and Quality: The best e-liquids offer consistent flavor and performance throughout the bottle. Low-quality liquids often degrade over time, affecting flavor and overall satisfaction.

Ingredient Quality and Safety: Quality ingredients are key to a smooth, enjoyable vape. Ensure your e-liquid is made from high-quality, pharmaceutical-grade nicotine and safe, regulated ingredients.

Top E-Liquid Brands for 2025

We’ve compiled a list of top e-liquid brands for 2025, each known for its exceptional flavor, quality ingredients, and reliable performance:

1. Bar Juice 5000: Experience the Future of Flavor.

Bar Juice 5000 is a top-tier e-liquid brand known for delivering mouth-watering flavors, satisfying nicotine hits, and unmatched quality in every puff. Crafted with vapers in mind, these e-liquids are the perfect alternative to Refillable Vape Kit—offering the same great taste and convenience, but with better value and sustainability.

Whether you're after something fruity and refreshing, cool and icy, or sweet and indulgent, Bar Juice 5000 has got your cravings covered. Each flavor is formulated with a balanced 50VG/50PG blend, making it ideal for use in pod kits and low-powered MTL devices, ensuring dense clouds and smooth throat hits.

Top 5 Bar Juice 5000 Flavours:

Menthol Mint – A crisp, clean blend that delivers ultimate refreshment with every puff. Perfect for ex-smokers or anyone who loves a cooling hit.

Banana Pear – A smooth, creamy banana base uplifted by the juicy freshness of ripe pear. Sweet, mellow, and seriously moreish.

Blueberry Watermelon – The perfect fruit duo! Bursting with the sweetness of blueberries and the hydrating coolness of watermelon.

Coconut Pineapple – A tropical escape in every drag. Think creamy coconut layered with bright, tangy pineapple—like a vacation in your vape.

Cherry Ice – Bold, sweet cherries with a chilling menthol finish. A balanced flavour for vapers who want fruit with a frosty twist.

E-Liquid Specs

VG/PG Ratio: 50VG / 50PG – Ideal for flavour and cloud balance

Nicotine Strengths: 10mg and 20mg salt nicotine – Smooth and fast absorption

Bottle Size: 10ml TPD-compliant bottles

Whether you're new to vaping or a seasoned user switching from disposables, Bar Juice 5000 delivers a consistent and enjoyable experience.

Ready to Upgrade Your Vape Game? 👉 Explore the Bar Juice 5000 Collection

Dinner Lady has carved a legendary reputation in the vaping world for its decadent dessert-inspired e-liquids and bold fruity blends. Known for their award-winning Lemon Tart and Strawberry Macaroon, Dinner Lady continues to impress vapers worldwide with rich, satisfying flavours that feel like a treat in every puff.

But it's not just about desserts anymore — Dinner Lady’s expanded range now includes refreshing fruit medleys and ice-kissed blends, all crafted to deliver smooth throat hits and well-balanced vapour with their 50/50 VG/PG ratio.

Top Dinner Lady Flavours to Try:

Mixed Fruit – A juicy fruit explosion of your favourite sweet picks.

Banana Ice – Ripe banana chilled with an icy twist for a creamy-cool finish.

Strawberry Ice – Classic strawberries cooled with a frosty menthol exhale.

Strawberry Watermelon – A sweet summer duo with bold flavour and a refreshing kick.

Kiwi Lime Passion Fruit – A zesty and tropical trio bursting with tangy depth and tropical sweetness.

E-Liquid Specs

VG/PG Ratio: 50VG / 50PG – Balanced for flavour and smooth MTL vaping

Nicotine Strengths: Available in 5mg, 10mg, 20mg salt nicotine

Ideal for: Pod systems, starter kits, and mouth-to-lung (MTL) vapers

Indulge in Premium Flavours Without Compromise 👉 Shop the Full Dinner Lady Collection

3. SKE Crystal: Where Flavor Meets Perfection.

SKE Crystal delivers a smooth, no-fuss vaping experience that balances premium flavour, affordability, and user-friendly design. Known for their crystal-clear aesthetics and consistent performance, SKE Crystal e-liquids are a go-to for both beginners and seasoned vapers looking for bold taste without complications.

From classic menthols to juicy fruit blends, SKE Crystal offers a wide variety of satisfying flavours, each crafted to provide a balanced throat hit and full-bodied vapour with a 50VG/50PG blend — perfect for mouth-to-lung (MTL) devices and pod kits.

Top SKE Crystal Flavours You’ll Love:

Watermelon Cherry – A fruity fusion of summer watermelon and bold cherry tones.

Gami Rare – A mysterious and unique flavour combo, crafted for adventurous palates.

Triple Mango – A mango lover’s dream — rich, layered, and incredibly juicy.

Blueberry Peach Ice – The sweetness of blueberries and peaches with a cool menthol twist.

Watermelon Strawberry – Two crowd-favourites combined into a refreshing fruit blend.

E-Liquid Specs

VG/PG Ratio: 50VG / 50PG – Perfect balance for smooth hits and reliable flavour

Nicotine Strengths: Available in 10mg and 20mg salt nicotine

Bottle Size: 10ml TPD-compliant bottles

Ideal for: Pod kits, refillable vape pens, and MTL devices

Bold Flavour. Smooth Experience. Everyday Vaping, Crystal Clear.👉 Browse the Full SKE Crystal Collection

4. Elux: For the Vape that Speaks to You.

Elux has become a go-to choice for vapers seeking powerful flavour, sleek disposables, and on-the-go convenience. With its stylish designs and rich flavour delivery, Elux devices are crafted to offer a smooth, hassle-free vaping experience — perfect for both newcomers and everyday vapers.

Whether you prefer cool menthols, sweet fruits, or unique blends, Elux’s range offers something to satisfy every palate. With a balanced 50VG/50PG ratio and nicotine strengths of 10mg and 20mg, you’ll get both a satisfying throat hit and great cloud production — ideal for mouth-to-lung (MTL) devices and pod systems.

Top Elux Flavours Loved by Vapers Grape Gummy Bear – Sweet and candy-like, with a fruity grape explosion Blueberry – Simple, bold, and juicy — perfect for daily vaping Blackberry Ice – Dark, sweet berries balanced with a cool menthol chill Strawberry Ice – Fresh strawberry sweetness layered with icy refreshment Blue Raspberry Cherry – A zingy combo of tangy blue razz and ripe cherry

 Elux Device Subtypes

  Elux Legend

Iconic design, long-lasting puff count, and top-selling flavour options

Perfect for users who want performance and simplicity in a single device

  Elux Fire Rose

Sleek, floral-inspired design with an elevated visual aesthetic

Delivers the same great flavours with a stylish, premium look

E-Liquid Specs

VG/PG Ratio: 50VG / 50PG – Smooth draws with satisfying cloud output

Nicotine Strengths: 10mg and 20mg salt nicotine

Device Type: Disposable & pod-compatible formats

Best for: MTL vapers, ex-smokers, and those looking for easy, reliable performance

Big on Flavour. Built for Convenience. Choose Elux. 👉 Shop the Full Elux Collection Now

5. Lost Mary: The Perfect Vape for Every Moment.

Lost Mary delivers an elevated vaping experience through its premium, disposable devices crafted for flavour lovers and style seekers alike. Known for their fruit-forward and cocktail-inspired blends, Lost Mary is all about combining bold taste, smooth nicotine hits, and sleek device design for vapers who crave something a cut above the rest.

Whether you're into tropical blends, cool mints, or exotic beverage twists, Lost Mary has something that hits the spot — every single time. With a smooth 50VG/50PG ratio and available in 10mg or 20mg salt nicotine, these e-liquids are tailored for mouth-to-lung (MTL) vaping and pod systems, giving you satisfying clouds without compromising on throat hit.

Top Lost Mary Flavours Worth Trying

Citrus Lime Rum – Zesty lime with hints of citrus and rum for a cocktail-like vape Tobacco – A refined, mellow tobacco blend — smooth and rich for classic lovers Blackcurrant Orange Vodka – Dark berries, tangy orange, and vodka notes for an indulgent experience

Cherry Lemon Mint – A sweet-tart cherry and lemon fusion cooled down with mint

Lemon Sour Strawberry Watermelon – A punchy blend of sour lemon, fresh strawberry, and juicy watermelon

E-Liquid Specs

VG/PG Ratio: 50VG / 50PG – Perfect for flavour clarity and smooth MTL vaping

Nicotine Strengths: Available in 10mg and 20mg salt nicotine

Best For: Refillable Vape Kit, refillable pods, and daily use

Keep it 100 Dew Drop 100ml E-Juice