Observations on the Preparation of β-Lactose Octaacetate
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Abstract Attempts to substantially increase the relative proportion of β-lactose octaacetate in products of acetylation of α-lactose monohydrate using various acetylation protocols failed. Nevertheless, the revised protocol for isolation and crystallization, based on the classical work by Hudson and Johnson, rendered preparation of β-lactose octaacetate less labor intensive. It is proposed that the melting point and [α]D value are not reliable criteria of purity of β-lactose octaacetate, which can be confidently determined by 1H NMR spectroscopy. Keywords: 1,2,3,6,2′,3′,4′,6′-Octa-O-acetyl-β-lactose2,3,4,6-Tetra-O-acetyl-β-d-galac- topyranosyl-(1→4)-12,3,6-tetra-O-acetyl-β-d-glucopyranose2,3,4,6-Tetra-O-acetyl-β- d-galactopyranosyl-(1→4)-12,6-tri-O-acetyl-α,β-d-glucopyranose2,3,4,6-Tetra-O-ace- tyl-β-d-galactopyranosyl-(1→4)-12,6-tri-O-acetyl-β-d-glucopyranose; Crystallization ACKNOWLEDGMENT This research was supported by the Intramural Research Program of the NIH, NIDDK. This article not subject to US copyright law. Notes The term lactose is a trivial name reserved[ Citation 1 ] for β-D-galactopyranosyl-(1→4)-α,β-D-glucopyranose (or 4-O-β-D-galactopyranosyl-α,β-D-glucopyranose). The terms D-lactose or D-lactopyranose, which can often be found in print, are notoriously incorrect. The "D" is redundant because of the definition, and "…pyran…" is obvious because of the (1→4)-linkage involved in the structure and, therefore, unnecessary. Sigma-Aldrich has discontinued offering the compound (>98% purity), and the current price by the sole supplier in the United States, 3B Scientific Corporation (www.3bsc.com), is $980/100 g. Toronto Research Chemical, Inc. lists the compound at $1000/100 g, but the anomeric purity of the material is uncertain.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it