Selecting L-Leucine in Industrial Chemicals, explained properly

A recent Industrial Chemicals selection case got stuck on how to pair and compatibilise L-Leucine (CAS 61-90-5). Worth walking the logic through using that example.

How it works

Before jumping to conclusions —

Industrially, the value of L-Leucine (CAS 61-90-5) is rarely on the spec sheet — it is whether it stably meets your process window. In Industrial Chemicals, its purity, impurity profile and batch consistency usually matter more than a single 'assay' number, because what really moves the finished result is often the ignored impurities and physical properties. Comparable grades:

• L-1,2,3,4-TETRAHYDRO-QUINOLINE-2-CARBOXYLIC ACID HYDROCHLORIDE (CAS 63430-98-8)：a comparable grade often evaluated alongside。
• L-1,2,3,4-Tetrahydroisoquinoline-3-carboxylic acid (CAS 74163-81-8)：a comparable grade often evaluated alongside。
• L-1,2,3,4-TETRAHYDRONORHARMAN-3-CARBOXYLIC ACID (CAS 42438-90-4)：a comparable grade often evaluated alongside。
• L-1-Boc-Nipecotic acid (CAS 88495-54-9)：a comparable grade often evaluated alongside。
• L-1-CBZ-PIPECOLINAMIDE (CAS 61703-39-7)：a comparable grade often evaluated alongside。

Key selection dimensions

The single most important one: Define the end use and process window first, then work back to required purity and impurity limits — not the other way around.

Check compatibility with other materials in the system; run a trial when unsure.

Match packaging and feeding method to on-site equipment so the material is usable on arrival.

Retain samples of critical lots and run third-party checks; do not rely on the supplier COA alone.

Its typical specs: name L-Leucine, CAS 61-90-5, formula C6H13NO2, MW 131.09 g/mol, standard purity per batch COA, packaging confirmed per order, storage keep sealed in a cool, dry place. Final values follow the batch COA and order confirmation.

Don't trip on these

Comparing price but not impurity profile: same assay with different impurities can yield wildly different results.

Skipping samples and scaling up: going straight to volume most often fails on compatibility.

Ignoring transport and storage: most 'arrived-dead' cases trace back to loose handling.

Q&A

When buying L-Leucine, which batch documents should I expect?

Standard flow: COA with each shipment, MSDS and TDS on request; if you have a target spec or customer acceptance criteria, list the key limits up front — the supplier will match to your grade, which beats a generic COA.

What should I compare between different batches of L-Leucine?

Beyond assay, the impurity profile and batch-to-batch consistency matter most — residual solvent, colour, heavy metals can shift significantly at the same nominal purity, and that is what moves the finished result. Hold samples of critical lots for third-party checks.

What usually goes wrong with L-Leucine in transport and storage?

Most 'arrived-dead' cases trace back to loose handling: moisture, over-temperature, or commingling. Keep sealed packaging in a cool, dry store, and verify lot numbers and arrival temperature before dosing.

What is the molecular formula and weight of L-Leucine?

For L-Leucine, the molecular formula is C6H13NO2 and molecular weight about 131.09 g/mol (CAS 61-90-5). These are published physical properties; exact purity, specification and packaging follow the batch COA and order confirmation.

Close cousins in the range

• L-1,2,3,4-TETRAHYDRO-QUINOLINE-2-CARBOXYLIC ACID HYDROCHLORIDE (CAS 63430-98-8)
• L-1,2,3,4-Tetrahydroisoquinoline-3-carboxylic acid (CAS 74163-81-8)
• L-1,2,3,4-TETRAHYDRONORHARMAN-3-CARBOXYLIC ACID (CAS 42438-90-4)
• L-1-Boc-Nipecotic acid (CAS 88495-54-9)
• L-1-CBZ-PIPECOLINAMIDE (CAS 61703-39-7)

See site search for L-Leucine or browse the Organic Chemicals directory.

Procurement contact

Jinan Shenghe Chemical Co., Ltd. supplies chemical raw materials and fine chemicals; a COA ships with every batch, with MSDS and technical data sheets available on request. In your enquiry include product name, CAS, target purity and packaging, and we will provide documents and a quote to the relevant standard.

Contact: info@chemsp.cn | +86-18553102138

Note: This page is for industrial raw-material technical discussion only. Products are supplied for industrial and research use, not for consumer or medical use. Drinking-water, food, cosmetic or pharmaceutical applications must meet applicable regulations and customer standards; specifications, compliance documents and transport requirements follow the batch COA and order confirmation.

Data source & notes

Physical data in this page (formula, molecular weight, etc.) is referenced from public chemical databases such as PubChem, ChemSpider and the CAS Registry — intrinsic published properties of the substance.The CAS number (61-90-5) of L-Leucine is the authoritative registry identifier from CAS, useful for precise cross-database verification.Purity, packaging, storage and transport follow the batch COA and order confirmation documents; application notes are general industry experience and any specific process must be validated and assessed for compliance.