Influence of extracts from bark of deciduous trees on the activity of the amylolytic enzyme-alpha amylase

Sarmite Janceva, Anna Andersone, Liga Lauberte, Natalija Zaharova, Galina Telysheva, Jelena Krasilnikova, Inara Nokalne, Julija Janceva

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Citations (Scopus)


The effect of water extracts obtained from bark of growing in Latvia and widely spread in Europe grey alder (Alnus incana), black alder (Alnus glutinosa) and aspen tree (Populus tremula), on the amylase activity in human saliva was evaluated. The extracts were obtained using advanced ACE equipment and distilled hot water as a solvent. The total yields of extractives from bark were rather similar and varied from 16 % to 21 % based on dry bark. However, the content of proantocianidine and salicine derivatives used as diagnostic characteristic for evaluation of effect of extracts on activity of amylase – a glucose-polymers cleavage enzyme-differed significantly. The results of in-vitro tests realized using the model of human gastrointestinal pass have shown that the abovementioned extracts in micro dosages are able to increase significantly activity of amylase. However, this effect is dose dependent and when the dose is exceeded the opposite effect – inhibition of amylase activity-is observed. This effect is explained by increasing of proantocianidins component in the volume of the tested extract dose, because pure proantocianidins, isolated from grey alder bark significantly inhibited activity of amylase. The further investigation is necessary in order to estimate effective and safe dosages for application of extracts providing a guaranteed unambiguous effect of activation or inhibition of amylase activity.

Original languageEnglish
Title of host publicationMaterials Science and Applied Chemistry IV
EditorsMaris Turks
PublisherTrans Tech Publications Ltd
Number of pages6
ISBN (Print)9783035738490
Publication statusPublished - 2021
Event61st International Scientific Conference of Riga Technical University (RTU): Section of Materials Science and Applied Chemistry 2020 - Riga, Latvia
Duration: 23 Oct 202023 Oct 2020
Conference number: 61

Publication series

NameKey Engineering Materials
Volume903 KEM
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795


Conference61st International Scientific Conference of Riga Technical University (RTU)
Abbreviated titleMSAC 2020
Internet address


  • Antioxidant activity
  • Aspen (Populus tremula)
  • Biological active compounds
  • Black alder (Alnus glutinosa)
  • Extracts
  • Green extraction
  • Grey alder (Alnus incana)
  • Proanthocyanidins
  • Salicins
  • α-amylase

Field of Science*

  • 2.5 Materials engineering
  • 2.3 Mechanical engineering

Publication Type*

  • 3.1. Articles or chapters in proceedings/scientific books indexed in Web of Science and/or Scopus database


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