idchkg
An Unflattened Identity and Change Knowledge Graph

caffetannic acid unspecified sense

concept · 12 mentions

A chemical compound in coffee

Other senses of “caffetannic acid”

chemical chemical compound compound

Connections

The concepts, people, and places this entity is most linked to by claims — node size is mention count, colour is type, dashed nodes are other senses of the same word.

caffetannic acidcaffetannic acid (chemical)caffetannic acid (chemical compound)caffetannic acid (compound)outer layers of coffee beans — 1 shared claimC_14_H_16_O_7 — 1 shared claimC_15_H_18_O_8 — 1 shared claimC_30_H_18_O_16 — 1 shared claimC_18_H_24_O_10 — 1 shared claimC_21_H_28_O_14 — 1 shared claimferric chloride — 1 shared claimcaffeic acid and glucose — 1 shared claimprotocatechuic acid — 1 shared claimcaffeic acid — 1 shared claim_coffee_ — 1 shared claimchlorogenic and coffalic acids — 1 shared claimouter layers of cof…C_14_H_16_O_7C_15_H_18_O_8C_30_H_18_O_16C_18_H_24_O_10C_21_H_28_O_14ferric chloridecaffeic acid and gl…protocatechuic acidcaffeic acid_coffee_chlorogenic and cof…
Concept

Defining properties

Perspectives

Claims grouped by the voice that makes them.

Hlasiwetz

  • caffetannic acid has composition C_15_H_18_O_8
    assertsneutralsource: coffee-pg28500
    Hlasiwetz,[124] who represents it as C_15_H_18_O_8
    judge verdicts (2)
    • groundedness 1.00 pass — The claim is directly and explicitly stated in the passage. The passage clearly indicates that Hlasiwetz represents caffetannic acid with the empirical formula C_15_H_18_O_8, which is exactly what the claim asserts.
    • qualifier_fidelity 1.00 pass — All qualifiers are faithful to the passage. The viewpoint correctly identifies Hlasiwetz as the source rather than using 'author'. The stance 'asserts' accurately reflects the passage's framing ('represents it as'). The sentiment is appropriately neutral for a factual chemical formula assignment. The time qualifiers are correctly set to null since the passage provides no temporal information. The context is appropriately empty as the passage does not restrict the claim to a particular sense or role. The quote is verbatim and directly supports the claim.
  • caffetannic acid yields on resolution caffeic acid
    assertsneutralsource: coffee-pg28500
    resolved a caffetannic acid, which he had isolated, into glucose and a peculiar crystallizable acid, C_8_H_8_O_4, which he named caffeic acid
    judge verdicts (2)
    • groundedness 1.00 pass — The claim is directly stated in the passage. The text explicitly states that Hlasiwetz 'resolved a caffetannic acid, which he had isolated, into glucose and a peculiar crystallizable acid, C_8_H_8_O_4, which he named caffeic acid,' which directly supports the claim that caffetannic acid yields caffeic acid upon resolution.
    • qualifier_fidelity 1.00 pass — All qualifiers are faithful to the passage. The viewpoint correctly attributes the claim to Hlasiwetz as named in the passage. The stance 'asserts' appropriately reflects the passage's presentation of this as a factual scientific finding. The sentiment is neutral, matching the passage's objective tone. Time qualifiers are correctly null as the passage provides no temporal information. Context is empty as appropriate, since the passage does not restrict this claim to a specific sense or role. The quote is verbatim from the passage and accurately supports the claim about caffetannic acid yielding caffeic acid upon resolution.
  • glucose is result of resolving caffetannic acid
    assertsneutralsource: coffee-pg28500
    Hlasiwetz,[161] who resolved a caffetannic acid, which he had isolated, into glucose and a peculiar crystallizable acid
    judge verdicts (2)
    • groundedness 1.00 pass — The claim is directly stated in the passage. The text explicitly states that Hlasiwetz 'resolved a caffetannic acid, which he had isolated, into glucose and a peculiar crystallizable acid,' confirming that glucose is a result of resolving caffetannic acid according to Hlasiwetz's work.
    • qualifier_fidelity 1.00 pass — All qualifiers are faithful to the passage. The viewpoint correctly attributes the finding to Hlasiwetz as named in the passage. The stance 'asserts' accurately reflects the passage's presentation of this as a scientific claim. The sentiment is appropriately neutral for a factual scientific finding. The time qualifiers are correctly null since the passage provides no temporal information. The context is appropriately empty as the passage does not restrict this claim to a particular sense or role. The quote is verbatim from the passage and directly supports the claim about Hlasiwetz resolving caffetannic acid into glucose and caffeic acid.

William H. Ukers (author)

  • caffetannic acid gives dark green coloration with ferric chloride
    assertsneutralsource: coffee-pg28500
    A dark green coloration is given with ferric chloride
    judge verdicts (2)
    • groundedness 1.00 pass — The claim is directly stated in the passage: 'A dark green coloration is given with ferric chloride' appears verbatim in the second paragraph describing the chemical reactions of caffetannic acid. This is fully supported without requiring outside knowledge or over-generalization.
    • qualifier_fidelity 1.00 pass — All qualifiers are faithful to the passage. The viewpoint is correctly attributed to the author (the passage states this as established fact without attributing to a named source). The stance is appropriately 'asserts' as the passage presents this as agreed-upon chemical knowledge. Sentiment is neutral, matching the passage's matter-of-fact tone. Time qualifiers are all null, which is correct since the passage provides no temporal information. Context is empty, which is appropriate as no specific sense or role restriction is mentioned. The quote is verbatim from the passage and directly supports the claim.
  • caffetannic acid produces upon boiling with alkalies or dilute acids caffeic acid and glucose
    assertsneutralsource: coffee-pg28500
    upon boiling it with alkalies or dilute acids, caffeic acid and glucose are formed
    judge verdicts (2)
    • groundedness 1.00 pass — The claim is directly stated in the passage. The text explicitly states: 'upon boiling it with alkalies or dilute acids, caffeic acid and glucose are formed,' which exactly matches the subject-predicate-object relationship in the claim.
    • qualifier_fidelity 1.00 pass — All qualifiers are faithful to the passage. The viewpoint is correctly attributed to the author (the passage states facts without attributing to a named source). The stance 'asserts' correctly reflects the passage's declarative statement about chemical reactions that 'are generally agreed upon.' Sentiment is neutral, matching the scientific tone. Time qualifiers are appropriately null since the passage provides no temporal information. Context is empty, which is appropriate as the passage does not restrict this claim to a particular sense or role. The quote appears verbatim in the passage and directly supports the claim.
  • caffetannic acid produces upon fusion with alkali protocatechuic acid
    assertsneutralsource: coffee-pg28500
    Fusion with alkali produces protocatechuic acid
    judge verdicts (2)
    • groundedness 1.00 pass — The claim is directly stated in the passage: 'Fusion with alkali produces protocatechuic acid.' This is a straightforward assertion about the chemical reaction of caffetannic acid with alkali, with no rewording or interpretation required.
    • qualifier_fidelity 1.00 pass — All qualifiers are faithful to the passage. The viewpoint is correctly attributed to the author (the passage presents this as established fact without attribution to a named source). The stance is properly marked as 'asserts' since the passage states this as agreed-upon chemical knowledge. Sentiment is appropriately neutral for a factual chemical reaction. Time qualifiers are correctly null as the passage provides no temporal scope. Context is appropriately empty as no specific sense restriction applies. The quote is verbatim and directly supports the claim.

John E. King

  • caffetannic acid exists in coffee 1917
    disputesneutralsource: coffee-pg28500
    caffetannic acid did not exist in coffee
    judge verdicts (2)
    • groundedness 0.70 pass — The claim accurately captures John E. King's position stated at the 1917 convention: he announced that 'the much-discussed caffetannic acid did not exist in coffee.' The claim correctly attributes this view to King with neutral sentiment and the proper timestamp, though it frames it as 'disputes' rather than simply stating his negative position.
    • qualifier_fidelity 0.85 pass — Mostly faithful qualifiers. Viewpoint correctly attributes to John E. King. Stance appropriately uses 'disputes' since King stated the acid 'did not exist.' Sentiment is neutral. Time is accurate to 1917 convention. Context is appropriately empty. Quote is accurate. Minor deduction: the claim's predicate 'exists in' with the perspective that it 'did not exist' creates a slight logical tension in how the claim is framed, though the qualifiers themselves correctly capture King's position.
  • caffetannic acid is a mixture of chlorogenic and coffalic acids 1917
    assertsneutralsource: coffee-pg28500
    it most probably was a mixture of chlorogenic and and coffalic acids
    judge verdicts (2)
    • groundedness 0.70 pass — The claim is supported by the passage. John E. King did announce at the 1917 convention that his investigations showed caffetannic acid 'most probably was a mixture of chlorogenic and coffalic acids,' though the passage phrases it as a probabilistic assertion rather than a definitive statement, which is reflected in the minor rewording from King's qualified language.
    • qualifier_fidelity 0.85 pass — The claim is largely faithful to the passage. Viewpoint, stance, sentiment, and time are all correctly attributed to John E. King at the 1917 convention. The quote is accurate (appearing verbatim in the passage). However, there is a minor issue: the claim states the predicate as 'is a mixture of' (asserting certainty), while the passage uses 'most probably was a mixture of' (indicating probability/speculation). The stance should reflect this qualified assertion more precisely, though the quote does capture the original language. Context is appropriately empty as the passage provides none.

Allen

  • caffetannic acid has composition C_14_H_16_O_7
    assertsneutralsource: coffee-pg28500
    Allen,[123] who gives it the empirical formula C_14_H_16_O_7
    judge verdicts (2)
    • groundedness 1.00 pass — The claim is directly stated in the passage. The text explicitly attributes the empirical formula C_14_H_16_O_7 to Allen, exactly as quoted in the claim's evidence.
    • qualifier_fidelity 1.00 pass — All qualifiers are faithful to the passage. The viewpoint correctly attributes the claim to Allen (not the author), the stance is appropriately 'asserts' as the passage states Allen 'gives it' the formula, sentiment is neutral as the passage presents this matter-of-factly without positive or negative connotation, time qualifiers are correctly null as no temporal information is provided, context is appropriately empty as there is no restriction to a particular sense or role, and the quote appears verbatim in the passage and directly supports the claim.

Cazeneuve and Haddon

  • caffetannic acid has composition C_21_H_28_O_14
    assertsneutralsource: coffee-pg28500
    Cazeneuve and Haddon,[126] as C_21_H_28_O_14
    judge verdicts (2)
    • groundedness 1.00 pass — The claim is directly stated in the passage. The passage explicitly attributes the formula C_21_H_28_O_14 to Cazeneuve and Haddon when discussing various proposed compositions of caffetannic acid.
    • qualifier_fidelity 0.90 pass — All qualifiers are faithful to the passage. The viewpoint correctly attributes the formula to Cazeneuve and Haddon as named sources, stance is appropriately 'asserts', sentiment is neutral, time is correctly null (no temporal information provided), and context is appropriately empty. The quote is verbatim from the passage. Minor note: the quote could be more complete to fully support the claim (e.g., including 'Cazeneuve and Haddon,[126], as C_21_H_28_O_14' with surrounding context), but the quoted fragment does appear verbatim and does support the composition claim.

Graf

  • coffee has flowers containing caffetannic acid caffetannic acid ⟨20-year-old coffee trees⟩
    assertsneutralsource: coffee-pg28500
    he found 0.9 percent caffein, a reducing sugar, caffetannic acid, and phytosterol
    judge verdicts (2)
    • groundedness 1.00 pass — The claim is directly stated in the passage. Graf's examination of flowers from 20-year-old coffee trees explicitly found caffetannic acid among other compounds, as quoted in the passage.
    • qualifier_fidelity 1.00 pass — All qualifiers are faithful to the passage. The viewpoint correctly attributes the finding to Graf. The stance 'asserts' appropriately matches the passage's framing of Graf's examination results. The sentiment is neutral, matching the factual presentation. The time qualifiers are correctly null since no date is given. The context '20-year-old coffee trees' accurately reflects the passage's specification of the subject. The quote appears verbatim and directly supports the claim about caffetannic acid being found in the flowers.

Griebel

  • caffetannic acid has composition C_18_H_24_O_10
    assertsneutralsource: coffee-pg28500
    Griebel,[125] as C_18_H_24_O_10
    judge verdicts (2)
    • groundedness 1.00 pass — The claim is directly supported by the passage, which explicitly states that Griebel assigned caffetannic acid the formula C_18_H_24_O_10. The quote provided matches the text exactly.
    • qualifier_fidelity 1.00 pass — All qualifiers are faithful to the passage. The viewpoint correctly attributes the claim to Griebel by name. The stance 'asserts' appropriately reflects the passage's presentation of Griebel's proposal. The sentiment is neutral, matching the passage's objective enumeration of competing chemical formulas. The time is correctly set to null, as the passage provides no temporal information. The context is appropriately empty since the passage does not restrict the claim to a particular sense or period. The quote 'Griebel,[125] as C_18_H_24_O_10' appears verbatim in the passage and directly supports the claim about the chemical composition attributed to Griebel.

Richter

  • caffetannic acid has composition C_30_H_18_O_16
    assertsneutralsource: coffee-pg28500
    Richter, as C_30_H_18_O_16
    judge verdicts (2)
    • groundedness 1.00 pass — The claim is directly stated in the passage. The text explicitly mentions 'Richter, as C_30_H_18_O_16' when listing various proposed empirical formulas for caffetannic acid, confirming that Richter asserted this composition.
    • qualifier_fidelity 1.00 pass — All qualifiers are faithful to the passage. The viewpoint correctly attributes the formula to Richter (not author). The stance 'asserts' is appropriate as the passage presents Richter's formula as one of several proposed compositions without disputing or questioning it. The sentiment is neutral, matching the passage's objective presentation. The time qualifiers are correctly null since the passage provides no temporal information. The context is appropriately empty as the passage does not restrict this claim to a specific sense or period. The quote 'Richter, as C_30_H_18_O_16' appears verbatim and directly supports the claim.

von Niessen

  • caffetannic acid is concentrated in outer layers of coffee beans ⟨according to von Niessen's hypothesis⟩
    assertsneutralsource: coffee-pg28500
    it is concentrated in the outer layers of the coffee beans
    judge verdicts (2)
    • groundedness 1.00 pass — The claim is directly stated in the passage. The text explicitly states: 'If these be his precepts' followed by the description that von Niessen 'evidently argued that the so-called "caffetannic acid" is the "harmful" substance in coffee, and that it is concentrated in the outer layers of the coffee beans.' The claim accurately captures von Niessen's hypothesis as presented in the passage.
    • qualifier_fidelity 0.95 pass — The claim is nearly perfectly faithful to the passage's qualifiers. The viewpoint, stance, sentiment, time, context, and quote are all accurate and properly attributed to von Niessen. The only minor observation is that the passage frames this as von Niessen's 'evident' argument or precept rather than a direct assertion, but the claim's framing of it as occurring "according to von Niessen's hypothesis" appropriately captures this subtlety. The quote is verbatim and accurately represents the passage's attribution to von Niessen.

Change over time

1917
  • exists in coffee
  • is a mixture of chlorogenic and coffalic acids

Disagreements

has composition …