Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Indicators02:39

Indicators

Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are called...
Pigmentation01:19

Pigmentation

The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...
Photoreceptors and Plant Responses to Light02:00

Photoreceptors and Plant Responses to Light

Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Scleroma; a clinico-pathological study of seven cases in one family.

The Annals of otology, rhinology, and laryngology·2010
Same author

Aldosteronism associated with adrenal cortical adenoma.

California medicine·1956
Same author

THE DIAGNOSIS OF SCLEROMA.

California medicine·1948
Same author

Contagiousness of Scarlet Fever.

California and western medicine·1944
Same author

Wartime Problems of a County Health Officer.

American journal of public health and the nation's health·1944
Same author

UNDULANT FEVER: REPORT OF AN UNUSUAL CASE.

California and western medicine·1943

Related Experiment Video

Updated: Jul 11, 2026

Autofluorescence Imaging to Evaluate Red Algae Physiology
05:54

Autofluorescence Imaging to Evaluate Red Algae Physiology

Published on: February 17, 2023

FRUIT AND VEGETABLE PIGMENTS AS INDICATORS.

O B Pratt, H O Swartout

    Science (New York, N.Y.)
    |May 9, 1930
    PubMed
    Summary

    Fruit pigment solutions serve as effective pH indicators, offering a stable and accessible option for chemical analysis. They are particularly useful for creating inexpensive test papers for acid-base titrations.

    Area of Science:

    • Analytical Chemistry
    • Biochemistry
    • Organic Chemistry

    Background:

    • Traditional pH indicators are widely used in chemical titrations.
    • The need for accessible and cost-effective indicator solutions persists in various laboratory settings.
    • Natural pigments offer a potential source for novel indicator development.

    Purpose of the Study:

    • To evaluate the efficacy of fruit pigment solutions as pH indicators.
    • To determine the stability and pH transition range of these natural indicators.
    • To explore the application of fruit pigment indicators in acid-base titrations and test paper preparation.

    Main Methods:

    • Preparation of pigment solutions from various fruits.
    • Determination of pH transition ranges through controlled acid-base titrations.

    More Related Videos

    Valorization of the Red Seaweed Gracilaria gracilis Through a Biorefinery Approach
    10:18

    Valorization of the Red Seaweed Gracilaria gracilis Through a Biorefinery Approach

    Published on: November 21, 2023

    Measurement of Carotenoids in Perifovea using the Macular Pigment Reflectometer
    09:35

    Measurement of Carotenoids in Perifovea using the Macular Pigment Reflectometer

    Published on: January 29, 2020

    Related Experiment Videos

    Last Updated: Jul 11, 2026

    Autofluorescence Imaging to Evaluate Red Algae Physiology
    05:54

    Autofluorescence Imaging to Evaluate Red Algae Physiology

    Published on: February 17, 2023

    Valorization of the Red Seaweed Gracilaria gracilis Through a Biorefinery Approach
    10:18

    Valorization of the Red Seaweed Gracilaria gracilis Through a Biorefinery Approach

    Published on: November 21, 2023

    Measurement of Carotenoids in Perifovea using the Macular Pigment Reflectometer
    09:35

    Measurement of Carotenoids in Perifovea using the Macular Pigment Reflectometer

    Published on: January 29, 2020

  • Fabrication and testing of indicator test papers using fruit pigment solutions.

    • Main Results:

    • Many fruit pigment solutions exhibit clear color changes within a useful pH range, often near neutral.
    • These solutions demonstrate good stability for practical applications.
    • Indicator test papers made from fruit pigments are effective and inexpensive.

    Conclusions:

    • Fruit pigment solutions are viable and practical pH indicators.
    • Their utility is maximized in the preparation of simple, cost-effective indicator test papers.
    • These natural indicators present a valuable alternative for certain analytical procedures.