The Action of Ultraviolet Light upon Cellulose and Cellulose Triacetate¹

The lignin fraction of animal feeding‐stuffs. I.—preliminary examination of lignin determination procedures

“…With immature plants MacDougall & DeLong (1948) found that pre-treatment employing continuous extraction with dilute mineral acid lowered the absolute methoxyl in the lignin fraction, and this may have been due to loss of some of the lignin as well as to loss of methoxyl-containing carbohydrates. Demethoxylation of lignin during pre-treatment seems unlikely, as this did not occur under the more drastic conditions used by Heuser & Schmelz (1920). Miiller (1939) pre-treated straw with water and I:/, hydrochloric acid €or long and successive periods at boiling point, and produced a loss of 8.3% of lignin, although the lignin residue obtained was probably still not free from contamination with humin-like substances.…”

Photochemical Degradation of Cotton Cellulose

“…The work of and others [14, 15,17,211 has provided evidence for the belief that two general mechanisn~s are involved in the degradation of cellulosic materials by light in the visible and ultraviolet ranges. In the short-wave uv region (2000-3000 A ) the breakdown is believed to be due to the pl~otolysis of the cellulose chains, leading to the cleavage of the carbon-to-carbon or carbon-tooxygen linkages, without any particular evidence that reaction with oxygen is vital to the process.…”

Some Auxiliary Effects of Textile Fungicides1

“…It was previously considered that the presence of oxygen was niecessary to obtain breakdown of cellulose exposed to light, this belief relating to the observation that the breakdown products of cellulose produced in this way have the properties of the so-called reduciing type of oxycellulose. However, it has been shown by Heuser and Chamberlain (1946) that this is not the case and the more recent work of Egerton (1949) has done much to resolve some of the difficulties of this complex matter.…”