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  1. Article ; Online: Providing potential solutions by using FT-IR spectroscopy for biofluid analysis: Clinical impact of optical screening and diagnostic tests.

    das Chagas E Silva de Carvalho, Luis Felipe / de Lima Morais, Thayná Melo / Nogueira, Marcelo Saito

    Photodiagnosis and photodynamic therapy

    2023  Volume 44, Page(s) 103753

    Abstract: Background: Currently, the potential of FT-IR spectroscopy for rapid diagnosis of many pathologies has been demonstrated by numerous research studies including those targeting COVID-19 detection. However, the number of clinicians aware of this potential ...

    Abstract Background: Currently, the potential of FT-IR spectroscopy for rapid diagnosis of many pathologies has been demonstrated by numerous research studies including those targeting COVID-19 detection. However, the number of clinicians aware of this potential and who are willing to use spectroscopy in their clinics and hospitals is still negligible. In addition, lack of awareness creates a huge gap between clinicians and researchers involved in clinical translation of current FT-IR technology hence hindering initiatives to bring basic and applied research together for the direct benefit of patients.
    Methods: Knowledge and medical training on FT-IR on the side of clinicians should be one of the first steps to be able to integrate it into the list of complementary exams which may be requested by health professionals. Countless FT-IR applications could have a life-changing impact on patients' lives, especially screening and diagnostic tests involving biofluids such as blood, saliva and urine which are routinely non-invasively or minimally-invasively.
    Results: Blood may be the most difficult to obtain by the invasive method of collection, but much can be evaluated in its components, and areas such as hematology, infectiology, oncology and endocrinology can be directly benefited. Urine with a relatively simple collection method can provide pertinent information from the entire urinary system, including the actual condition of the kidneys. Saliva collection can be simpler for the patient and can provide information on diseases affecting the mouth and digestive system and can be used to diagnose diseases such as oral cancer in its early-stages. An unavoidable second step is the active involvement of industries to design robust and portable instruments for specific purposes, as the medical community requires user-friendly instruments of advanced computational algorithms. A third step resides in the legal situation involving the global use of the technique as a new diagnostic modality.
    Conclusions: It is important to note that decentralized funds for variety of technologies hinders the training of clinical and medical professionals for the use of newly arising technologies and affect the engagement of these professionals with technology developers. As a result of decentralized funding, research efforts are spread out over a range of technologies which take a long time to get validated and translated to the clinic. Partnership over similar groups of technologies and efforts to test the same technologies while overcoming barriers posed to technology validation in different areas around the globe may benefit the clinical/medical, research and industry community globally.
    MeSH term(s) Humans ; Spectroscopy, Fourier Transform Infrared/methods ; Photochemotherapy/methods ; Photosensitizing Agents ; Saliva/chemistry ; Diagnostic Tests, Routine
    Chemical Substances Photosensitizing Agents
    Language English
    Publishing date 2023-08-18
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2149918-4
    ISSN 1873-1597 ; 1572-1000
    ISSN (online) 1873-1597
    ISSN 1572-1000
    DOI 10.1016/j.pdpdt.2023.103753
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Surface-Enhanced Raman Analysis of Uric Acid and Hypoxanthine Analysis in Fractionated Bodily Fluids.

    Tian, Furong / Carvalho, Luis Felipe das Chagas E Silva de / Casey, Alan / Nogueira, Marcelo Saito / Byrne, Hugh J

    Nanomaterials (Basel, Switzerland)

    2023  Volume 13, Issue 7

    Abstract: In recent years, the disease burden of hyperuricemia has been increasing, especially in high-income countries and the economically developing world with a Western lifestyle. Abnormal levels of uric acid and hypoxanthine are associated with many diseases, ...

    Abstract In recent years, the disease burden of hyperuricemia has been increasing, especially in high-income countries and the economically developing world with a Western lifestyle. Abnormal levels of uric acid and hypoxanthine are associated with many diseases, and therefore, to demonstrate improved methods of uric acid and hypoxanthine detection, three different bodily fluids were analysed using surface-enhanced Raman spectroscopy (SERS) and high-performance liquid chromatography (HPLC). Gold nanostar suspensions were mixed with series dilutions of uric acid and hypoxanthine, 3 kDa centrifugally filtered human blood serum, urine and saliva. The results show that gold nanostars enable the quantitative detection of the concentration of uric acid and hypoxanthine in the range 5-50 μg/mL and 50-250 ng/mL, respectively. The peak areas of HPLC and maximum peak intensity of SERS have strongly correlated, notably with the peaks of uric acid and hypoxanthine at 1000 and 640 cm
    Language English
    Publishing date 2023-03-29
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano13071216
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  3. Article ; Online: Optical techniques for fast screening - Towards prevention of the coronavirus COVID-19 outbreak.

    Carvalho, Luis Felipe das Chagas E Silva de / Nogueira, Marcelo Saito

    Photodiagnosis and photodynamic therapy

    2020  Volume 30, Page(s) 101765

    MeSH term(s) Betacoronavirus ; COVID-19 ; Coronavirus Infections/diagnostic imaging ; Coronavirus Infections/epidemiology ; Coronavirus Infections/prevention & control ; Disease Outbreaks ; Female ; Humans ; Male ; Mass Screening/methods ; Optical Imaging/methods ; Pandemics/prevention & control ; Pneumonia, Viral/diagnostic imaging ; Pneumonia, Viral/epidemiology ; Pneumonia, Viral/prevention & control ; SARS-CoV-2 ; Sensitivity and Specificity ; Spectrometry, Fluorescence/methods
    Keywords covid19
    Language English
    Publishing date 2020-04-15
    Publishing country Netherlands
    Document type Letter
    ZDB-ID 2149918-4
    ISSN 1873-1597 ; 1572-1000
    ISSN (online) 1873-1597
    ISSN 1572-1000
    DOI 10.1016/j.pdpdt.2020.101765
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Surface-Enhanced Raman Analysis of Uric Acid and Hypoxanthine Analysis in Fractionated Bodily Fluids

    Furong Tian / Luis Felipe das Chagas e Silva de Carvalho / Alan Casey / Marcelo Saito Nogueira / Hugh J. Byrne

    Nanomaterials, Vol 13, Iss 1216, p

    2023  Volume 1216

    Abstract: In recent years, the disease burden of hyperuricemia has been increasing, especially in high-income countries and the economically developing world with a Western lifestyle. Abnormal levels of uric acid and hypoxanthine are associated with many diseases, ...

    Abstract In recent years, the disease burden of hyperuricemia has been increasing, especially in high-income countries and the economically developing world with a Western lifestyle. Abnormal levels of uric acid and hypoxanthine are associated with many diseases, and therefore, to demonstrate improved methods of uric acid and hypoxanthine detection, three different bodily fluids were analysed using surface-enhanced Raman spectroscopy (SERS) and high-performance liquid chromatography (HPLC). Gold nanostar suspensions were mixed with series dilutions of uric acid and hypoxanthine, 3 kDa centrifugally filtered human blood serum, urine and saliva. The results show that gold nanostars enable the quantitative detection of the concentration of uric acid and hypoxanthine in the range 5–50 μg/mL and 50–250 ng/mL, respectively. The peak areas of HPLC and maximum peak intensity of SERS have strongly correlated, notably with the peaks of uric acid and hypoxanthine at 1000 and 640 cm −1 , respectively. The r 2 is 0.975 and 0.959 for uric acid and hypoxanthine, respectively. Each of the three body fluids has a number of spectral features in common with uric acid and hypoxanthine. The large overlap of the spectral bands of the SERS of uric acid against three body fluids at spectra peaks were at 442, 712, 802, 1000, 1086, 1206, 1343, 1436 and 1560 cm −1 . The features at 560, 640, 803, 1206, 1290 and 1620 cm −1 from hypoxanthine were common to serum, saliva and urine. There is no statistical difference between HPLC and SERS for determination of the concentration of uric acid and hypoxanthine ( p > 0.05). For clinical applications, 3 kDa centrifugal filtration followed by SERS can be used for uric acid and hypoxanthine screening is, which can be used to reveal the subtle abnormalities enhancing the great potential of vibrational spectroscopy as an analytical tool. Our work supports the hypnosis that it is possible to obtain the specific concentration of uric acid and hypoxanthine by comparing the SER signals of serum, saliva and ...
    Keywords vibrational spectroscopy ; bodily fluids ; blood serum ; saliva ; urine ; surface-enhanced Raman spectroscopy ; Chemistry ; QD1-999
    Subject code 333
    Language English
    Publishing date 2023-03-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Infrared spectroscopy for fast screening of diabetes and periodontitis.

    da Silva, Sara Maria Santos Dias / Ferreira, Camila Lopes / Rizzato, Jaqueline Maria Brandão / Toledo, Giovana Dos Santos / Furukawa, Monique / Rovai, Emanuel Silva / Nogueira, Marcelo Saito / Carvalho, Luis Felipe das Chagas E Silva de

    Photodiagnosis and photodynamic therapy

    2024  Volume 46, Page(s) 104106

    Abstract: Significance: FT-IR is an important and emerging tool, providing information related to the biochemical composition of biofluids. It is important to demonstrate that there is an efficacy in separating healthy and diseased groups, helping to establish FT- ...

    Abstract Significance: FT-IR is an important and emerging tool, providing information related to the biochemical composition of biofluids. It is important to demonstrate that there is an efficacy in separating healthy and diseased groups, helping to establish FT-IR uses as fast screening tool.
    Aim: Via saliva diagnosis evaluate the accuracy of FT-IR associate with machine learning model for classification among healthy (control group), diabetic (D) and periodontitis (P) patients and the association of both diseases (DP).
    Approach: Eighty patients diagnosed with diabetes and periodontitis through conventional methods were recruited and allocated in one of the four groups. Saliva samples were collected from participants of each group (n = 20) and were processed using Bruker Alpha II spectrometer in a FT-IR spectral fingerprint region between 600 and-1800 cm
    Results: Various FTI-R peaks were detectable and attributed to specific vibrational modes, which were classified based on confusion matrices showed in paired groups. The highest true positive rates (TPR) appeared between groups C vs D (93.5 % ± 2.7 %), groups C vs. DP (89.2 % ± 4.1 %), and groups D and P (90.4 % ± 3.2 %). However, P vs DP presented higher TPR for DP (84.1 % ±3.1 %) while D vs. DP the highest rate for DP was 81.7 % ± 4.3 %. Analyzing all groups together, the TPR decreased.
    Conclusion: The system used is portable and robust and can be widely used in clinical environments and hospitals as a new diagnostic technique. Studies in our groups are being conducted to solidify and expand data analysis methods with friendly language for healthcare professionals. It was possible to classify healthy patients in a range of 78-93 % of accuracy. Range over 80 % of accuracy between periodontitis and diabetes were observed. A general classification model with lower TPR instead of a pairwise classification would only have advantages in scenarios where no prior patient information is available regarding diabetes and periodontitis status.
    Language English
    Publishing date 2024-04-25
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2149918-4
    ISSN 1873-1597 ; 1572-1000
    ISSN (online) 1873-1597
    ISSN 1572-1000
    DOI 10.1016/j.pdpdt.2024.104106
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: FTIR spectroscopy as a point of care diagnostic tool for diabetes and periodontitis: A saliva analysis approach.

    Nogueira, Marcelo Saito / Barreto, Anna Laura / Furukawa, Monique / Rovai, Emanuel Silva / Bastos, Alice / Bertoncello, Gabriella / Carvalho, Luis Felipe das Chagas E Silva de

    Photodiagnosis and photodynamic therapy

    2022  Volume 40, Page(s) 103036

    Abstract: Diabetes mellitus (DM) is a general term for heterogeneous metabolic disorders whose main characteristic is chronic hyperglycemia. Considering that conventional diagnostic methods are currently unable of early DM detection and the number of diabetic ... ...

    Abstract Diabetes mellitus (DM) is a general term for heterogeneous metabolic disorders whose main characteristic is chronic hyperglycemia. Considering that conventional diagnostic methods are currently unable of early DM detection and the number of diabetic patients has been increasing worldwide, there is a clinical need for novel diagnostic approaches. Fourier-transform infrared (FT-IR) spectroscopy technique an alternative non-invasive diagnostic method for real-time evaluation of biofluids such as saliva. This study aims evaluate the feasibility of diagnosing diabetes and periodontitis through saliva samples based on their FT-IR spectra. Our first collection and spectral analysis of samples was a pilot study and comprised a total of 23 patients, 2 healthy, 9 with diabetes and 12 with diabetes and periodontitis. By using weighted KNN as classifier, we have obtained an area under the Receiver Operating Characteristic curve of 0.92 and 0.95 when considering the diabetes or diabetes + periodontitis groups as positive groups, respectively.
    Language English
    Publishing date 2022-07-30
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2149918-4
    ISSN 1873-1597 ; 1572-1000
    ISSN (online) 1873-1597
    ISSN 1572-1000
    DOI 10.1016/j.pdpdt.2022.103036
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  7. Article ; Online: Optical techniques for fast screening – Towards prevention of the coronavirus COVID-19 outbreak

    Carvalho, Luis Felipe das Chagas e Silva de / Nogueira, Marcelo Saito

    Photodiagnosis and Photodynamic Therapy

    2020  Volume 30, Page(s) 101765

    Keywords Biophysics ; Pharmacology (medical) ; Oncology ; Dermatology ; covid19
    Language English
    Publisher Elsevier BV
    Publishing country us
    Document type Article ; Online
    ZDB-ID 2149918-4
    ISSN 1873-1597 ; 1572-1000
    ISSN (online) 1873-1597
    ISSN 1572-1000
    DOI 10.1016/j.pdpdt.2020.101765
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Oral lesions of herpes zoster in COVID-19 patients or truly associated to the disease?

    de Carvalho, Luis Felipe das Chagas E Silva / Kitakawa, Dárcio / Cabral, Luiz Antônio Guimarães

    Oral diseases

    2020  Volume 27 Suppl 3, Page(s) 774–775

    MeSH term(s) COVID-19 ; Herpes Zoster/complications ; Humans ; SARS-CoV-2 ; Skin Diseases
    Keywords covid19
    Language English
    Publishing date 2020-07-07
    Publishing country Denmark
    Document type Letter ; Comment
    ZDB-ID 1290529-x
    ISSN 1601-0825 ; 1354-523X
    ISSN (online) 1601-0825
    ISSN 1354-523X
    DOI 10.1111/odi.13472
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  9. Article ; Online: New insights of Raman spectroscopy for oral clinical applications.

    de Carvalho, Luis Felipe das Chagas E Silva / Saito Nogueira, Marcelo

    The Analyst

    2018  Volume 143, Issue 24, Page(s) 6037–6048

    Abstract: Oral injuries are currently diagnosed by histopathological analysis of biopsy, which is an invasive procedure and does not give immediate results. On the other hand, the Raman spectroscopy technique is a real-time and minimally invasive analytical tool ... ...

    Abstract Oral injuries are currently diagnosed by histopathological analysis of biopsy, which is an invasive procedure and does not give immediate results. On the other hand, the Raman spectroscopy technique is a real-time and minimally invasive analytical tool with a notable diagnostic capability. At the current stage, researchers are widely aware of the diagnostic potential of the technique and how it is considered promising for providing biochemical information in real time and without damaging the tissue. The problem originates from a lack of relevant studies and clinical trials that could show the actual use of Raman spectroscopy to help patients. Our goal here is to narrow the relationship between physicists, chemists, engineers, computer scientists, and the medical community, and in fact discuss the potential of Raman spectroscopy as a novel clinical analysis method. In the present study, we focused on the use of Raman spectroscopy as a daily clinical practice. In this context, additional studies and in vivo tests should be performed with the same approach as a real application. We want to show the scientific and industrial community what is really necessary for this, starting from a clinical point of view. Using our previous experience publishing different oral pathologies and types of samples, we also aim to discuss the current state and potential of Raman spectroscopy and what is required to implement Raman spectroscopy for oral clinical applications.
    MeSH term(s) Animals ; Clinical Laboratory Techniques/instrumentation ; Clinical Laboratory Techniques/methods ; Humans ; Mouth Diseases/diagnosis ; Spectrum Analysis, Raman/instrumentation ; Spectrum Analysis, Raman/methods
    Language English
    Publishing date 2018-11-06
    Publishing country England
    Document type Journal Article
    ZDB-ID 210747-8
    ISSN 1364-5528 ; 0003-2654
    ISSN (online) 1364-5528
    ISSN 0003-2654
    DOI 10.1039/c8an01363b
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