Talk:Lignin

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Wiki Education Foundation-supported course assignment

This article is or was the subject of a Wiki Education Foundation-supported course assignment. Further details are available on the course page. Student editor(s): Awilson0.

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Buying lignin

Does anybody know where can I purchase lignin to analyze? I ordered some from Fisher, and it has huge background in Raman. I would like to try different source. Thanks! 21:27, 14 September 2007 (UTC)Lizardstone 21:27, 14 September 2007 (UTC)lizardstone

Kraft lignin may be hard to purchase since most of it is burned and there isn't much other use for it, despite a lot of effort. Lignosulfonate from the sulfite pulping process is more readily available. You could try contacting: [1] to request a sample. Silverchemist 01:36, 15 September 2007 (UTC)

Both these types of technical lignins are very different from natural lignin. I do not knew anyone selling natural lignin. The best is to prepare it yourself (there are descriptions in the litterature), or contact any academic department in wood chemistry - they mmight be able to help you. —Preceding unsigned comment added by 83.251.156.87 (talk) 16:18, 13 April 2008 (UTC)

Evolutionary origin

I'd love to see (and am incompetent to write) a section on the evolutionary history of lignin in this article. My hazy understanding is that lignin-producing plants originated in the Devonian and became widespread in the Carboniferous, but I'd like to know more about the evolutionary pressures that led to the development of lignin in the first place. arkuat (talk) 06:27, 2 June 2008 (UTC)

Eating Lignin

I arrived at this page from the Dietary Fiber entry hoping to learn more about food sources of Lignin and its effects on eaters. I hope somebody can contribute that to this article. Anotherviewkhh (talk) 00:20, 11 July 2010 (UTC)

The article indicates that lignin is not degraded by animal enzymes, so it cannot be absorbed into the bloodstream and has no direct nutritional value. If you Google the topic, you will find discussions of the beneficial effects of lignin on cows, but cows have rumens, and we dont. According to the lignin article, lignin actually detracts from the nutritional benefits of foods by blocking their absorption. The precursors to lignin, lignols are antioxidants and the type of things that certain food enthusiasts like to eat, but lignin cannot be reverted to lignols.--Smokefoot (talk) 13:40, 11 July 2010 (UTC)

Who determined the structure of plants ? Wow!! Does it "always look like that?"

That is one complicated molecule. The way it is presented in the article figure I assume that lignin is a well defined molecule (i.e. has that exact structure and does not normally appear as a range of MW variants like PEG). Anyone know if this is correct?Johnfravolda (talk) 18:21, 12 May 2011 (UTC)

Lignin is highly variable and the picture only represents an example of the entire molecule. It can be found in smaller fragments (mono-lignols) or huge structures. Native lignin is much larger than industrial lignin (Kraft etc). The MW is usually given as a broad range. Gibby is gibby (talk) 17:21, 31 January 2013 (UTC)

Rhodococcus jostii

identified as producing a lignin digesting enzyme, potentially increasing our capacity to produce biofuels from woody plant material.[2] [3](mercurywoodrose)75.61.141.184 (talk) 00:32, 12 June 2011 (UTC)

Degradation of Lignin while burning

This article does not mention the primary effect that burning lignin has on the flavor and/or aroma of food.Wjhonson (talk) 16:53, 8 July 2013 (UTC)

Composition

I would like to know what the elemental composition is – how much carbon, oxygen, and hydrogen. It probably varies from species to species, but can someone give us the ranges? Eric Kvaalen (talk) 20:13, 16 April 2014 (UTC)

This source [4] gives Carbon 63.4%, Hydrogen 5.9%, Oxygen 30.0%. Plantsurfer (talk) 08:06, 17 April 2014 (UTC)

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Angiosperm/Gymnosperm issue

The section describing the broad groupings of lignins by lignol source makes references to angiosperms as hardwoods and gymnosperms as softwoods/grasses. As a botanical definition this is incorrect because all grasses are angiosperms. I believe the wording of this section may be conflating the hard/soft wood as defined by industry (e.g., lumber, furniture, flooring) and the broad taxa encompassed by the gymnosperm and angiosperm groupings. I think it would be helpful to clarify the article by removing the references to gymnosperm and angiosperm. The softwood and hardwood grouping references can be left, perhaps with additional references to their common sources or features in usage. That seems like it would still adequately differentiate the two lignin groups involved without requiring a digression into the reproductive physiology of the source plant groups. Ajm1205 (talk) 00:50, 29 September 2022 (UTC)