Bridging the gaps: Bole and terra sigillata as artefacts, as simples and as antibacterial clays

Danae Venieri, Iosifina Gounaki, George E. Christidis, Charles W. Knapp, Petros Bouras-Vallianatos, Effie Photos-Jones

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Abstract

Medicinal earths are an important and yet, so far, little scientifically explored archaeological resource. They are almost always identified by their source locality. Our work over the last few years has focused on their chemical and mineralogical characterization and their testing as anti-bacterials. This paper presents the results of the mineralogical analysis and antibacterial testing of six medicinal earths, bole or Terra Sigillata (stamped earth) of unknown date and provenance in the Pharmacy Museum of the University of Basel. Only one of them, a red (Armenian?) ‘bole’, was found to be antibacterial against both Gram-positive and Gram-negative bacteria. A yellow powder of Terra Tripolitania was mildly antibacterial and against one pathogen only. We argue that medicinal earths are in a pivotal place to bridge the gap between currently dispersed pieces of information. This information relates to: (a) their nature, attributes, and applications as described in the texts of different periods, (b) the source of their clays and how best to locate them in the field today, and (c) the methods employed for their beneficiation, if known. We propose that work should be focused primarily onto those medicinal earths whose clay sources can be re-discovered, sampled and assessed. From then on, a parallel investigation should be initiated involving both earths and their natural clays (mineralogy at bulk and nano-sized levels, bio-geochemistry, microbiological testing). We argue that the combined study can shed light into the parameters driving antibacterial action in clays and assist in the elucidation of the mechanisms involved.
Original languageEnglish
Article number348
Number of pages11
JournalMinerals
Volume10
Issue number4
DOIs
Publication statusPublished - 14 Apr 2020

Keywords

  • Armenian bole
  • terra sigillata
  • antibacterial clays
  • Lemnian Earth

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  • Research Output

    On metal and 'spoiled' wine: analysing psimythion (synthetic cerussite) pellets (5th-3rd centuries BCE) and hypothesising gas-metal reactions over a fermenting liquid within a Greek pot

    Photos-Jones, E., Bots, P., Oikonomou, E., Hamilton, A. & Knapp, CW., 19 Aug 2020, (Accepted/In press) In : Archaeological and Anthropological Sciences. 35 p.

    Research output: Contribution to journalArticle

  • The interweaving roles of mineral and microbiome in shaping the antibacterial activity of archaeological medicinal clays

    Christidis, G. E., Knapp, C. W., Venieri, D., Gounaki, I., Elgy, C., Valsami-Jones, E. & Photos-Jones, E., 26 Apr 2020, In : Journal of Ethnopharmacology. 260, 112894.

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Greco-Roman mineral (litho)therapeutics and their relationship to their microbiome: the case of the red pigment miltos

    Photos-Jones, E., Knapp, C. W., Venieri, D., Christidis, G. E., Elgy, C., Valsami-Jones, E., Gounaki, I. & Andriopoulou, N. C., 31 Dec 2018, In : Journal of Archaeological Science: Reports. 22, p. 179-192 14 p.

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    Activities

    Aegean volcanic islands, Greece - sampling expedition

    Effie Photos-Jones (Advisor), Charles Knapp (Recipient) & George Christidis (Participant)

    21 Jun 20164 Jul 2016

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    Cite this

    Venieri, D., Gounaki, I., Christidis, G. E., Knapp, C. W., Bouras-Vallianatos, P., & Photos-Jones, E. (2020). Bridging the gaps: Bole and terra sigillata as artefacts, as simples and as antibacterial clays. Minerals, 10(4), [348]. https://doi.org/10.3390/min10040348