Thiazole, 2,4,5-Trimethyl-,
|
HS Code |
591366 |
| Chemical Formula | C6H9NS |
| Molar Mass | 127.21 g/mol |
| Appearance | Colorless to pale yellow liquid |
| Odor | Characteristic sulfurous odor |
| Density | 1.01 g/cm³ (approximate) |
| Boiling Point | 174 - 176 °C |
| Solubility In Water | Insoluble |
| Solubility In Organic Solvents | Soluble in many organic solvents like ethanol, ether |
| Flash Point | Approx. 60 °C |
| Stability | Stable under normal conditions but may react with strong oxidizing agents |
As an accredited Thiazole, 2,4,5-Trimethyl-, factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | 100g of 2,4,5 - Trimethyl - thiazole packaged in a sealed chemical - grade bottle. |
| Shipping | Thiazole, 2,4,5 - Trimethyl - is shipped in specialized containers, ensuring tight - sealed conditions. It adheres to strict chemical shipping regulations to prevent leakage and maintain safety during transit. |
| Storage | Thiazole, 2,4,5 - Trimethyl - should be stored in a cool, dry, well - ventilated area away from sources of ignition. Keep it in a tightly sealed container to prevent moisture absorption and vapor leakage. Store separately from oxidizing agents and incompatible substances to avoid potential chemical reactions. This helps maintain its stability and safety during storage. |
In extrusion-cooked snack seasonings, 2,4,5-trimethylthiazole is introduced as a top-note impactor through a lipid-based carrier pre-emulsified with standard mono- and diglycerides (E471) to ensure adhesion to low-moisture (3.5 %) puffed matrices. Regulatory clearance for this application derives from its listing as FEMA GRAS 3325 and its inclusion in 21 CFR § 172.515 (synthetic flavoring substances), with parallel acceptance under EU Regulation 1334/2008 (FL No. 15.027). The typical dosing in a finished dry seasoning blend ranges from 0.05 to 0.25 weight percent, translating to a residual concentration of 0.5–2.0 ppm in the snack base. Production lines often employ a continuous drum coater equipped with pneumatic atomizing nozzles operating at 2–4 bar, where the seasoning slurry is sprayed onto product at 40–50 °C. Process records show batch-to-batch top-note loss if the slurry holding time exceeds 90 minutes without nitrogen blanketing, owing to thioether auto-oxidation during recirculation. Terminal products include potato crisps, extruded corn collets, and pellet-fried snacks bearing burnt-meat or roasted-nut profiles. In these systems, the compound is frequently co-dosed with 2-acetylpyrazine and 4-methyl-5-hydroxyethylthiazole to replicate Maillard-type depth. A known operational boundary is the incompatibility with acidic seasoning components (e.g., citric acid below pH 4.0) that protonate the thiazole nitrogen, temporarily altering partition coefficients and causing a muted aroma release upon mastication.What Mechanism Protects Volatile Thiazoles in Hard-Boiled Sugar Masses?In the confectionery sector, 2,4,5-trimethylthiazole supplies the toasted, cocoa-like underlay typical of caramel-centered lollipops and toffees. The principal technical challenge is survivability through open-pan cooking where sugar syrups reach 140–150 °C and water activity drops below 0.3. To mitigate evaporative half-life reduction of approximately 40 % (measured via headspace GC-MS on a DB-WAX column, 30 m × 0.25 mm, 0.25 µm film), the flavor is pre-dispersed in a chilled hydrogenated vegetable fat carrier with a slip melting point of 34–38 °C and added only after the mass cools to 115–120 °C on an oil-jacketed cooling wheel. The inclusion rate in boiled sugar is typically 1.5–3.0 ppm based on finished weight. For chewing gum, a two-stage sigma-blade mixer is employed: the thiazole component, dissolved in triacetin (glyceryl triacetate) at a 1 % dilution, is incorporated into the gum base at 55–60 °C during the final plasticizing phase, with a final strip concentration of 5–12 ppm. Compliance with JECFA specification 1030 (assay ≥ 98 %) is mandatory, and manufacturers using isopropanol as a process solvent in concentrate manufacturing must verify residual solvent falls below the ICH Q3C Class 3 limit of 500 ppm in the delivered flavor. Confectionery-grade stability tests per ASTM D4169 (distribution cycle simulation) demonstrate less than 5 % sensory deviation when the flavor is encapsulated in a modified starch (OSA-starch) matrix prior to acid sanding.Processed Meat Brine Injection and Smoke-Replace SystemsFor restructured ham and poultry deli loaves, 2,4,5-trimethylthiazole contributes a char-grilled outer-belt note without requiring actual smokehouse treatment. The compound is insoluble in water (0.31 g/L at 25 °C) and must be solubilized into a brine system containing 6–12 % sodium chloride, 0.3–0.5 % sodium tripolyphosphate, and 0.5–1.0 % functional soy protein isolate as an emulsion stabilizer. A typical injection brine carries the thiazole at 8–15 ppm, delivering 1–2.5 ppm in the cooked muscle via multi-needle injectors operating at 1.2–1.8 bar with a 15–20 % pump uptake. The post-injection tumbling cycle (4 h at 2–4 °C under 80 kPa vacuum) must not exceed 6 hours total contact time with dissolved nitrite, because nitrosation at the thiazole C-5 position can generate a measurable yellow discoloration and an off-aroma detectable at 0.02 ppb. Cooking to a core temperature of 72 °C in a steam-circulated Kalle oven does not fully expel the thiazole; residual levels of 0.8–1.4 ppm are confirmed via SPME-GC/MS. This application aligns with USDA 9 CFR 424.21 for flavoring substances in meat products and must be declared on the ingredient panel as “artificial flavor” in the United States, while EU 1169/2011 requires its FL classification.When an oil-soluble thiazole must disperse in high-water-activity beverages, the formulation cannot rely on simple propylene glycol co-solvency alone to prevent ringing (separation) in the bottle neck. A two-stage high-pressure homogenization procedure is standard on production skids rated for 250–350 bar, processing a pre-emulsion containing 0.01–0.05 % 2,4,5-trimethylthiazole pre-blended in a medium-chain triglyceride (MCT) oil phase, together with 10–15 % gum arabic (Acacia senegal, with a weight-average molecular weight > 1.5 × 10⁶ Da) and 1–2 % citric acid ester emulsifier E472c. The particle size target is D[4,3] ≤ 0.55 µm, confirmed via laser diffraction (Malvern Mastersizer 3000, Hydro MV dispersion unit). The concentrate is let down into still beverages at rates that yield a final thiazole concentration of 0.08–0.25 ppm, contributing a creamy, nutty mouthfeel synonymous with cocoa-flavored dairy alternatives and so-called “brown” protein drinks. A process audit point is the minimum emulsifier hydration time: cold-water swelling of gum arabic requires ≥ 2 h under moderate agitation at 30–35 °C to achieve maximum surface load; otherwise, coalescence leads to accelerated Ostwald ripening during a 12-week shelf-life at 35 °C (ASTM F2410). Carbonated soft drinks (pH 2.8–3.2) must use an ester gum weighting agent (E445, 100–150 ppm) to balance the density of oil droplets against the carbonated aqueous phase and prevent buoyancy-driven separation.How Does 2,4,5-Trimethylthiazole Influence Sensory Fracture in Low-Tar Cigarettes?In American-blend cigarettes and roll-your-own tobaccos, this thiazole modulates the phenolic harshness of flue-cured Virginia lamina while reinforcing a toasted, nutty top character that survives tobacco burning temperatures of 700–900 °C at the pyrolysis zone. The flavor is typically dissolved in a ternary solvent system of propylene glycol, ethanol, and water (ratio 50:35:15 v/v) to a final thiazole strength of 0.3–0.8 %. Application onto cut-rag occurs in a rotating casing cylinder via air-atomized spray nozzles at a loading of 5–12 g per 100 kg of tobacco, delivering a concentration of 0.5–12 ppm in the finished cigarette filler. This use is sanctioned within the EU Tobacco Products Directive (2014/40/EU) reporting framework, where 2,4,5-trimethylthiazole must be disclosed on the EU-CEG ingredient portal under tobacco flavor category 9. Thermal transfer efficiency studies using a Borgwaldt RM-20H smoking machine and a Cambridge filter pad demonstrate a mainstream smoke transfer rate of 3.5–5.8 % of the applied amount, with the remainder lost to sidestream combustion or pyrosynthesis. A critical formulation restriction is the co-presence of reducing sugars (> 8 % by weight in casing) which accelerate Amadori rearrangements during tobacco storage, progressively binding the thiazole into non-volatile melanoidin-like macromolecules and causing a 15–20 % drop in headspace potency over 6 months at 22 °C and 60 % RH.Pet food palatants for dry kibble rely on the roasted-meat sulfur note of 2,4,5-trimethylthiazole to duplicate the profile of commercial retorted wet foods in a low-moisture format. The compound is added to a liquid animal digest carrier (chicken or pork liver hydrolysate, with a degree of hydrolysis 30–45 %) at 100–250 ppm on a dry-weight basis, and the resulting slurry is sprayed onto expanded kibble exiting a single-screw extruder (Wenger X-185, 25:1 L/D) at a temperature of 65–75 °C in a rotary coating drum. Final concentration in the finished pet food is 0.4–1.5 ppm. Because the palatant coating must withstand 12–18 months of warehouse storage without rancidity, antioxidant synergists (mixed tocopherols 200 ppm, ascorbyl palmitate 50 ppm, and rosemary extract standardized to 7 % carnosic acid) are co-blended into the flavor premix. No specific AAFCO approval exists for individual flavor chemicals, but the overall palatant must comply with the Ingredient Definitions for pet food under the Model Bill. The sulfur heterocycle’s high volatility necessitates that the coated kibble cool to ambient temperature (25–30 °C) on a forced-air belt within 12 minutes; extended residence on a hot bed results in fade losses of 18–25 % as measured by a paired comparison sensory panel against a frozen reference.Within Laundry Detergent Fragrances, Encapsulation Protocols for Sustained HeadspaceThe use of 2,4,5-trimethylthiazole in household and personal care perfumery targets a roasted-coffee facet in masculinized fine fragrance accords and an edible edge in vanilla-scented body washes. In a liquid laundry detergent with a pH of 8.5–10.0, the free thiazole undergoes rapid base-catalyzed ring hydrolysis at the C=N bond, generating mercaptoketone intermediates that trigger an undesirable sulfury, alliaceous off-odor in the wash liquor. To circumvent this, the molecule is embedded in a melamine-formaldehyde (MF) core-shell microcapsule (D[50] 15–25 µm, shell thickness 120–180 nm) via interfacial polymerization in a high-shear IKA Magic LAB reactor at 8,000–12,000 rpm. The slurry is post-added to the detergent base at a level corresponding to 0.02–0.08 % encapsulated fragrance. Capsule rupture during fabric drying releases a burst of thiazole, providing residual fabric-nut odor persistence rated at a mean 3.5 on a 5-point Olfactoscan scale after 24 h line-drying. Fragrance compound compliance is governed by IFRA Standards (thiazole class under the 48th Amendment) and the International Nomenclature of Cosmetic Ingredients (INCI) listing as “2,4,5-Trimethylthiazole” on consumer-article labels. The critical compatibility exclusion is the combination with hypochlorite bleach-containing (chlorine) cleaning systems, where rapid oxidation to a sulfoxide and sulfone obliterates odor contribution within 30 s of contact.Heterocyclic Scaffold Utilization in Agrochemical Intermediate SynthesisAs a tri-substituted thiazole building block, 2,4,5-trimethylthiazole participates in regioselective electrophilic substitution at the 5-methyl position when treated with N-chlorosuccinimide in anhydrous acetonitrile at reflux (82 °C), yielding the corresponding 5-chloromethyl derivative, a key precursor for coupling with thioamides to form dithiazole-linked pharmacophores. A documented procedure run at 5-mol scale in a glass-lined steel reactor (Pfaudler, 200 L) with a jacket temperature setpoint of 85 °C and nitrogen blanket of 0.5 bar gauge achieves 78 % isolated yield after vacuum distillation (bp 94–96 °C at 12 mmHg). Bulk industrial supply for this intermediate application is governed by REACH registration requirement for substances manufactured or imported above 1 tonne per annum, demanding a full chemical safety report including a Derived No-Effect Level (DNEL) for dermal and inhalation routes. Published data for downstream crop protection compounds originating from this exact intermediate remains limited to patent families claiming use as a nematocide synergist; however, the molecule itself is not a registered active ingredient with an ISO common name. A practical handling constraint encountered in kilo-lab settings is the material’s sensitivity to prolonged light exposure, developing a deep amber tint when stored in clear borosilicate under laboratory fluorescence beyond 2 weeks, which necessitates amber glass or UN-certified HDPE drums with UV barrier for export shipment.Aroma Carry-Through in Nutritional Bar Matrixes Subjected to Multiple Thermal ProfilesHigh-protein meal replacement bars operate across incompatible thermal histories: a hot-mix cook of sugar syrups at 110–130 °C, a cooling trough passage to 45 °C, and a final enrobing step where chocolate is tempered at 29–31 °C. 2,4,5-Trimethylthiazole, if dosed purely into the syrup phase, suffers a quantifiable blow-off in the range of 55–70 % due to steam flash evaporation upon vacuum release in the cooker. Industrial mitigations developed on continuous Sollich bar lines involve pre-absorption of the thiazole (0.8–1.5 ppm in the final bar) onto a porous calcium silicate anti-caking agent (median pore diameter 3.5 nm) pre-blended into the dry protein mix (whey or soy isolate) and added only during the low-temperature ribbon blender stage, after the syrup mass temperature drops below 60 °C. Sensory validation using a difference-from-control test (ISO 4120:2021) showed no significant perceptible difference (α = 0.05) in nutty roast character between the thiazole-fortified prototype and a positive control that had undergone only ambient blending. The regulatory pathway for such “nutraceutical-like” products defaults to GRAS affirmation under 21 CFR 170.30 for the flavor component, provided it is used in a quantity not exceeding that reasonably required to accomplish the intended physical effect, which is strictly organoleptic. A documented failure mode is the interaction of thiazole with the reducing sugar tagatose (used in diabetic bars): an accelerated Maillard browning resulted in a visually unacceptable darkening (ΔE*ab > 5.0 versus control) after 3 months under ICH conditions of 40 °C and 75 % RH. |
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The chemical catalogued under CAS 13623-11-5, systematically designated 2,4,5-trimethylthiazole, represents a fully methyl-substituted sulfur–nitrogen heterocycle within the thiazole family. Its empirical formula C6H9NS and molecular weight of 127.21 g/mol place it among the lower-molecular-mass aroma actives, yet the arrangement of three methyl groups on the thiazole ring—at positions 2, 4, and 5—yields a potency and organoleptic character sharply distinct from its dimethyl- and mono-substituted analogues. Where 2,4-dimethylthiazole conveys green, vegetable-like undertones and 2,5-dimethylthiazole veers toward boiled beef and sulfury cooked notes, the 2,4,5-trimethyl substitution pattern introduces a pronounced roasted cocoa and dark coffee signature superimposed on a nutty, pyrazine-like backbone. This structural threshold effect, wherein the introduction of a third methyl group shifts the aroma vector from savory-meaty to brown-roasted, makes the compound a cornerstone in process flavorings designed to replicate thermally generated food matrices without reliance on pyrazine feedstocks. Industrial batches of 2,4,5-trimethylthiazole are typically isolated via fractional distillation following cyclization of α-haloketones with thioamides, a route that can generate isomeric contaminants such as 2,4,5-trimethylthiazole N-oxide or residual 2,5-dimethylthiazole intermediates; rigorous post-synthesis purification on structured packing columns of 15–20 theoretical plates is required to reach organoleptic-grade purity.
Flavor chemists have long observed that thiazoles substituted with three methyl groups mimic the sensory attributes of roasted cocoa and coffee far more faithfully than di-substituted variants. 2,4,5-Trimethylthiazole exhibits an odor detection threshold in water reported as 2.5–5.0 µg/L (odor activity value calculations from GC-olfactometry data published in peer-reviewed flavor science literature), a concentration range that positions it among high-impact aroma chemicals comparable to 2-acetyl-1-pyrroline. When formulated into a cocoa-replacer base free of tetramethylpyrazine, addition of 0.2–1.0 ppm of 2,4,5-trimethylthiazole in propylene glycol diluent shifts the descriptive sensory profile from simple brown sweetness to a complex roasted, slightly phenolic profile that panelists associate with Ghanaian unfermented cocoa liquor. Comparative triangle tests conducted with 4,5-dimethylthiazole (FEMA 3274) and 2,4-dimethylthiazole (FEMA 3279) reveal that whereas the di-methyl compounds require 3–5× higher dosage to approximate similar brown notes, they simultaneously introduce earthy and musty by-notes absent in the tri-methylated homologue. This specificity is attributed to steric shielding of the thiazole nitrogen by the 2- and 4-methyl groups, which modulates hydrogen-bonding interactions with olfactory receptor sites while preserving sufficient volatility at oral cavity temperatures.
In high-temperature process flavor manufacture—specifically, extrusion-cooked cereal-based snacks processed in twin-screw equipment with barrel temperature profiles of 140–170 °C—loss of 2,4,5-trimethylthiazole through steam volatilization can exceed 40% of the spiked dose unless the compound is pre-emulsified in a lipid carrier with a melting point above 45 °C. Plant trials on a Bühler twin-screw extruder (L/D 32) demonstrated that microencapsulation in hydrogenated palm stearin reduced process loss to 12–15%, while direct liquid injection into the preconditioner barrel resulted in aroma carryover into subsequent production runs, a documented contaminant memory effect requiring 2–3 purge cycles. This processing bottleneck underscores the necessity of integrating the aroma chemical into the fat phase rather than the dry premix, a practice now codified in standard operating procedures for shelf-stable snack seasoning lines.
| Compound | FEMA No. | Odor Threshold (µg/L in H2O) | Boiling Point (°C) | Flash Point (°C) | Predominant Aroma Descriptors |
|---|---|---|---|---|---|
| 2,4,5-Trimethylthiazole | 3325 | 2.5–5.0 | 166–168 | 56 | Roasted cocoa, dark coffee, nutty, slight meaty |
| 4,5-Dimethylthiazole | 3274 | 10–20 | 158–162 | 48 | Roasty, green, sulfury, earthy |
| 2,4-Dimethylthiazole | 3279 | 15–30 | 144–147 | 42 | Green, nutty, vegetable, asparagus |
| 2,5-Dimethylthiazole | 3280 | 5–10 | 152–155 | 44 | Boiled beef, metallic, roasted nut |
A direct comparison of boiling points and flash points across the methylated thiazole series highlights the systematic vapor pressure reduction achieved with each incremental methyl addition. The 2,4,5-trimethyl derivative’s flash point of 56 °C (closed cup, ASTM D93) places it in a higher storage-class category than 2,4-dimethylthiazole, which flashes at 42 °C, a factor that simplifies warehousing in ambient conditions in temperate climates but does not eliminate the requirement for nitrogen-purged headspace in containers exceeding 25 kg. Isomer differentiation by routine GC analysis on a polar phase such as a DB-WAX column (30 m × 0.25 mm, 0.25 µm film thickness) yields retention index values of 1510–1520 for the 2,4,5-compound, distinctly separated from 2,4-dimethylthiazole at 1380–1390. Quality control protocols typically specify a minimum purity of 98.0% (area normalization, FID detection) with individual non-conforming isomer content not exceeding 0.5% each.
2,4,5-Trimethylthiazole is affirmed as Generally Recognized As Safe (GRAS) by FEMA under number 3325 and is listed in the European Union Register of Flavouring Substances with FL No. 15.025. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) monograph requires a minimum assay of 98%, refractive index nD20 between 1.517 and 1.521, and specific gravity at 20 °C in the range 0.974–0.980. Current production lots inspected against these compendial methods routinely achieve purity of 99.2–99.7% when additional rectification is performed under reduced pressure (30–40 mbar). The pale yellow liquid may develop amber discoloration upon prolonged exposure to visible light, a degradation pathway traceable to singlet oxygen oxidation at the thiazole C-2 methyl group; this is mitigated by amber glass packaging and maintenance of headspace oxygen below 0.5% v/v. Storage stability studies indicate that when held at 2–8 °C under inert gas, the compound retains >99% of its original assay for 24 months.
In product development for clean-label meat analogues, 2,4,5-trimethylthiazole is frequently dosed at 0.05–0.5 ppm in the finished consumer product, typically via a liquid flavor concentrate prepared with triacetin or medium-chain triglyceride solvents to avoid solvent-derived off-notes. High-shear mixing of the concentrate into structured vegetable protein pastes prior to thermal setting requires careful monitoring of paste temperature, as local hot spots above 65 °C can drive off the thiazole and deplete the top-note impact. Extruded meat analogue production lines equipped with closed injection ports positioned downstream of the cooling die—operating at mass temperatures of 45–55 °C—have been shown to achieve retention efficiencies exceeding 90%, provided the injection nozzle diameter is matched to a Reynolds number consistent with laminar additive flow into the viscoelastic protein melt. This process arrangement avoids the losses observed when the volatile is introduced into the raw mix upstream of the high-temperature cooking zone.Confectionery flavor houses periodically evaluate the substitution of ethyl-2-methylthiazole (FEMA 3287) with 2,4,5-trimethylthiazole in dark chocolate enhancer compositions. Ethyl-2-methylthiazole imparts a distinctive cocoa-powdery note with a faintly astringent, bitter aftertaste that can accentuate the dryness of high-cocoa-solids formulations. Replacing it—at a 1:0.3 weight ratio—with 2,4,5-trimethylthiazole shifts the temporal aroma profile toward a rounder, creamier cocoa mid-palate while maintaining the roasted cereal top note that consumers associate with freshly processed cocoa nibs. Sensory panel data collected using nine-point hedonic scaling (ISO 11136:2014) demonstrated that in a model dark chocolate containing 70% cocoa mass, the substituted formula scored 0.8–1.1 points higher on brown-roasted intensity without statistically significant change in bitterness perception (p > 0.05). The substitution is not universally beneficial, however: in milk chocolate with fat content above 30%, the partition coefficient of 2,4,5-trimethylthiazole into the lipid phase reduces its headspace concentration below sensory threshold unless the dosage is adjusted upward, a matrix effect documented by static headspace GC-MS analysis indicating a 35–50% reduction in the compound’s air–lipid partition coefficient relative to the less lipophilic ethyl-2-methylthiazole.
In savory bouillon and reaction flavor pastes, the same thiazole operates through a complementary mechanism, enhancing the robustness of meaty notes without pushing the profile into sulfurous over-charred territory. A typical process uses a Maillard reaction base of hydrolyzed vegetable protein and reducing sugars reacted at 110 °C for 90 min, into which 2,4,5-trimethylthiazole is post-added at 0.1–0.3% of the paste mass after cooling to 40 °C. This sequence avoids thermal degradation of the thiazole and preserves the integrity of the roasted note. Published comparative data between 2,4,5-trimethylthiazole and the structurally similar 2-acetylthiazole (popcorn, nutty) indicate that the acetyl derivative promotes a distinctly different caramel-popcorn trajectory, making them functionally non-interchangeable in beef and chicken flavor applications. Formulators exploiting this differentiation can create layered roast profiles by combining the trimethylthiazole at sub-threshold levels (0.5–1.5 ppb in ready-to-consume broth) with bis(2-methyl-3-furyl)disulfide, achieving a sulfury-meaty core wrapped in a brown-roasted outer layer.
Production-scale synthesis via the Hantzsch thiazole route—condensing 2-bromo-3-pentanone with thioacetamide—yields crude 2,4,5-trimethylthiazole containing up to 4–8% of positional isomers, predominantly 2,4-dimethylthiazole arising from premature dehydrohalogenation. Fractional distillation through a spinning-band column of 30 theoretical plates at a reflux ratio of 10:1 is required to meet chromatographic purity specifications. In one documented kilo-scale campaign, distillation cuts collected at overhead temperatures of 165–167 °C and 28 mbar vacuum yielded the target compound at 99.4% GC purity, while the preceding cut (162–164 °C) contained 12% of the dimethyl impurity. This narrow boiling point window necessitates automated fraction collection linked to a real-time inline refractometer set to trigger a cut when nD20 crosses 1.5180.
| Parameter | Specification Limit | Test Method |
|---|---|---|
| Assay (GC, area%) | ≥ 98.0 | In-house GC-FID, DB-5 column |
| Refractive Index nD20 | 1.517–1.521 | ISO 280:1998 |
| Specific Gravity (20/20°C) | 0.974–0.980 | ASTM D4052-22 |
| Acid Value (mg KOH/g) | ≤ 1.0 | ASTM D664-18e1 |
| Water Content (Karl Fischer) | ≤ 0.2% | ISO 760:1978 |
| Appearance | Pale yellow clear liquid, free of sediment | Organoleptic |
Operational boundaries for safe handling reflect the compound’s classification as a combustible liquid with closed-cup flash point 56 °C. Local exhaust ventilation designed for a capture velocity of 0.5 m/s at the weighing station is mandated, and personnel exposure must be kept below the internal occupational exposure limit of 2 ppm (8-hour TWA, as derived from structure-activity relationship assessment in the absence of a published regulatory OEL). When the compound is intended for spray-dried encapsulated flavor powders, pre-emulsification with gum arabic and maltodextrin at a wall-material-to-core ratio of 4:1 is essential to minimize surface oil and oxidative loss during atomization at inlet temperatures of 180–190 °C. Test data from a Niro MOBILE MINOR™ spray dryer indicate that without such encapsulation, the recovery of 2,4,5-trimethylthiazole in the powder can drop to 25–30%, an economically prohibitive loss.
