scholarly journals ’n Ondersoek na die opname van sink deur Chrysopogon zizanioides uit gekontamineerde oppervlakwater

Author(s):  
L Keay ◽  
V Wepener ◽  
CT Wolmarans

Die verwydering van metale uit die omgewing kan deur verskeie prosesse, waarvan fitoremediëring die mees natuurlike is, gedoen word. Chrysopogon zizanioides is in hierdie studie gebruik om die opname en akkumulasie van sink (Zn) deur hierdie plant vanuit ’n akwatiese omgewing te bestudeer. Voorbereide eksemplare van C. zizanioides is oor ’n tydperk van 28 dae aan verskeie sinkkonsentrasies blootgestel. Water-, wortel- en blaarmeristeemmonsters is op 1 uur, 7, 14 en 28 dae na sinkblootstelling versamel en verwerk, waarna die sinkinhoud met behulp van atoomabsorpsiespektrofotometrie (AAS) bepaal is. Uit die resultate is dit duidelik dat die persentasie afname van Zn in die water oor die totale blootstellingsperiode die laagste was by die hoogste sinkkonsentrasie (15 en 30 mg/L). Terwyl dit by 0.1 mg/L en 1.5 mg/L met onderskeidelik 38% en 47% teen dag 28 afgeneem het. Verder het die biokonsentrasie faktor aangedui dat die persentasie Zn opgeneem deur die wortels per massa eenheid by al die bloostellingskonsentrasies en periodes hoër as in die blare was. Wat die translokasie faktor soos bereken vir die onderskeie wortel- en blaarmonsters betref, het dit nooit 1 oorskry nie. Dit dui daarop dat die blare nie ’n prominente rol in die akkumulasie van Zn gespeel het nie. Hierdie studie het aangetoon dat C. zizanioides by sinkkonsentrasies van 0.1 mg/L en 1.5 mg/L effektief mag wees as fitoremediëringsplante. Langertermyn studies sou moontlik kon aandui of Zn enigsins deur die blare getransporteer en gestoor word.

Author(s):  
S. Sai Kiran ◽  
S. Madhu ◽  
Chidambaranathan Bibin ◽  
Mebratu Markos Woldegiorgis ◽  
P. Kumran

Planta Medica ◽  
2021 ◽  
Author(s):  
Fadilah Kurrimboccus ◽  
Ané Orchard ◽  
Michael Paul Danckwerts ◽  
Sandy van Vuuren

AbstractAcne is a skin condition arising from excess sebum production and microbial overgrowth within the pilosebaceous unit. Several commercial essential oils have shown promising activity against acne-related pathogens. Due to their volatility and thermal instability, the formulation of essential oils into commercial products remains a pharmaceutical challenge. Thus, this study aimed to develop a viable anti-acne topical treatment as an oil-in-water emulsified lotion to overcome these challenges. Chrysopogon zizanioides (vetiver) displayed noteworthy antimicrobial activity with a mean minimum inhibitory concentration of 0.14 mg/mL against Cutibacterium acnes, Staphylococcus aureus, Staphylococcus epidermidis, and Streptococcus pyogenes. Emulsified lotions containing C. zizanioides were developed through the hydrophilic-lipophilic balance approach. At tested hydrophilic-lipophilic balance values of 8, 9, and 10, C. zizanioides emulsified lotions displayed maximum stability at hydrophilic-lipophilic balance 9 with a minimum change in mean droplet size and polydispersity index of 20.61 and 33.33%, respectively, over 84 days. The C. zizanioides emulsified lotion at optimum hydrophilic-lipophilic balance 9 completely inhibited the growth of C. acnes and killed S. aureus, S. epidermidis, and S. pyogenes within 24 h. Additionally, the lotion retained antimicrobial activity against these test micro-organisms over the 84-day stability test period. Thus, the C. zizanioides emulsified lotion demonstrated physical stability and antimicrobial efficiency, making it an ideal natural product anti-acne treatment.


2016 ◽  
Vol 22 (1) ◽  
pp. 123-132 ◽  
Author(s):  
Nilton de Freitas Souza Ramos ◽  
Alisson Carraro Borges ◽  
Gustavo Castro Gonçalves ◽  
Antonio Teixeira de Matos

RESUMO No presente estudo avaliou-se a remoção de demanda bioquímica de oxigênio (DBO), nitrogênio total (NT) e fósforo total (PT) da água residuária de suinocultura (ARS) em sistemas alagados construídos (SACs) de escoamento horizontal subsuperficial, além da contribuição das espécies vegetais cultivadas: Polygonum punctatum (erva-de-bicho) e Chrysopogon zizanioides (capim-vetiver). Foram implantados três SACs, utilizando-se argila expandida como meio suporte, sendo um cultivado com P. punctatum (SACE), outro cultivado com C. zizanioides (SACV) e um mantido como controle, sem cultivo (SACC). Para um tempo de retenção hidráulica nominal (τ) de 3,2 dias, observou-se remoção de DBO, NT e PT, ao longo do período experimental, com eficiências médias de 85, 38 e 51% (SACC), 89, 48 e 69% (SACE) e 81, 36 e 45% (SACV), respectivamente. O melhor desempenho foi observado no SACE. Foram obtidas, em termos de matéria seca, produtividades de 2,79 e 1,91 g m-2 d-1 e remoções de NT de 1,54 e 1,01% e de PT de 0,81 e 1,19%, da carga aplicada, para a erva-de-bicho e o capim-vetiver, respectivamente.


2019 ◽  
Vol 26 (10) ◽  
pp. 10057-10069 ◽  
Author(s):  
Elisa Fasani ◽  
Giovanni DalCorso ◽  
Andrea Zerminiani ◽  
Alberto Ferrarese ◽  
Paolo Campostrini ◽  
...  

2012 ◽  
Vol 22 (2) ◽  
pp. 443-450 ◽  
Author(s):  
Gabrielle M. Lima ◽  
Lucindo J. Quintans-Júnior ◽  
Sara M. Thomazzi ◽  
Emyle M. S. A. Almeida ◽  
Mônica S. Melo ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document