From the blog January 8, 2015 Modernist Cuisine Team

Keeping it Fresh: Make Your Juice Last Longer

Jack LaLanne was the world’s first fitness superhero, the “godfather of fitness.” He also really loved juice. The Jack LaLanne Juicer turned juicing into a mainstream practice and juicers into common kitchen equipment.

Research studies have yet to validate claims that juicing is more beneficial than eating whole fruits and vegetables, with some studies suggesting that cleanses or excessive consumption can do more harm than good. Juicing, within reason, is a great way to incorporate these ingredients into your diet if you aren’t naturally inclined to eat your fruits and veggies. There is also something undeniably delightful about a glass of fresh-squeezed juice or the unique flavor combinations that can be created—orange-durian-strawberry-mango-kale, anyone?

Whether you juice for health or to please your palate, here is everything you need to know about how to help your juice stay fresh and vibrantly colored for as long as possible and about selecting the proper juicer for your needs.

KIT3_Fresh Squeezed_MG_9779

How juicing works

Juicing seems like a violent practice. There are gentler ways of retrieving flavor, such as stock making, when we coax flavors from these ingredients as they simmer. Juicing, however, is a form of violence on the biological building blocks of food so that we can unlock the liquid essence within. This means rupturing cells, but the cellular violence is well worth it—juicing yields incredibly rich flavors.

The rich flavors are fleeting, reserved for the freshest juice, which explains why the fresh stuff will always taste better than store-bought counterparts. When we make juice, sugars, acids, and peel oils combine to make the unmistakable flavor of fresh juice; however, over time, the acidity ruins the incredible flavor by destroying the aromatic peel oils over time.

Making the most of your juice

Juicing is only half the battle. Freshly squeezed juice is fleeting. Although cellular destruction is required to release flavor-creating enzymes, as soon as cell walls are ruptured, the clock and biology will start working against you. The same oils that imbue juice with intense flavors and bright colors oxidize quickly. Aromas and flavors begin to diminish as flavor compounds break down.

When we cut open a piece of fruit, we know that it will eventually turn an unappetizing brown. The same applies for the liquid of those fruits. Many juices brown quickly in reaction to the trauma of juicing. Browning is a defense mechanism that plants use to prevent infection. To defend against germs, plants raise antimicrobial defenses. One mechanism is the release of the enzyme polyphenol oxidase (PPO) from tissue, which leads to the production of protective compounds, such as tannins, and to brown color. Pulp presents another issue. It typically browns long before the liquid. Pulp contains high concentrations of oxidizing enzymes and their molecular targets.

KIT3_Freeze finish_MG_3625

Browning may seem like a strange issue for those of us who are accustomed to purchasing juice at the store. Those juices, however, have already been treated to prevent color change and to preserve flavor. Although juicing is a relatively simple technique, these seven tips, used alone or in combination, will help you to improve your product and get the most out of your produce.

  • First, keep everything cold. Browning is caused by enzymes that respond to heat: for every 10°C/ 18°F drop in temperature, enzymatic activity falls by about half. You can safely chill most fruits to just above freezing before juicing them; however, avoid chilling subtropical produce, such as bananas, mangoes, avocados, and strawberries. Chilling these fruits can induce chilling injury, wherein low temperatures reduce the quality of produce.
  • Freezing produce prior to juicing will also prevent browning. Deep-freezing will permanently destroy the browning enzymes; however, flavor-creating enzymes might take a bit of a hit. If you decide to freeze your produce, thaw prior to juicing, unless you want to have a smoothie on your hands.
  • A three-minute dip in boiling water destroys browning enzymes. Blanching requires high temperatures, though, which will partially cook food by the time the enzymes break down.
  • Although some of us prefer a little pulp in our juice, filtering it out will eliminate the tissue that enzymes act on to form brown pigments.
  • Try lowering the pH of your juice. The more acidic the juice, the slower the enzymatic reactions that cause discoloration. High acidity also acts directly on brown pigments to lighten their color.
  • If you own a vacuum sealer, use it to help prevent oxidation. Although some oxygen is dissolved into the juice itself, vacuum sealing the juice will help slow down browning by removing oxygen.
  • Natural preservatives are another way to retain color and restore flavor. Ingredients like ascorbic acid (vitamin C), citric acid, malic acid, and honey will prevent browning, while essential oil, alpha tocopherol (vitamin E), or even a squirt of fresh juice from a different batch will preserve flavor.

Picking a juicer

The type of juicier you own will also make an impact on your juice. Devout juicing advocates prefer cold-press juicers over equipment that introduces any heat to the process. In truth, the mechanisms that make each juicer work can affect the quality of your product, yield size, and even what types of produce you can juice.

Centrifugal-style juicers:

Centrifugal-style juicers are similar to blenders—they pulverize food with a broad, flat blade that sits at the bottom of a spinning mesh basket. The pulverized food is flung against the basket wall, where centrifugal force expels most of the juice from the pulp through the mesh and into a waiting container. These juicers handle both fruits and vegetables well, but look for machines that are designed to automatically dispel pulp deposits to make cleaning easier and to prevent clogs forming in the basket. With centrifugal force comes one major drawback: the friction of the force oxidizes the juice faster, which damages the flavor and color. You’ll also find that the yield from these machines is smaller than its Champion-style counterpart.

KIT3_Juicers centrifugal_Y2F1124

Champion-style juicers:

Champion-styles juicers are workhorses. Food is pushed down a chute onto a serrated, rotating blade. As fruits and vegetables pass through the blades, cell walls rupture, releasing their contents, which rapidly collect in a bowl. These appliances excel at separating solids from liquids: pulp is discarded into a separate waste receptacle. Champion-style juicers are also ideal for juicing relatively dry foods, like wheatgrass or leafy greens that can be difficult for other machines to pulverize. The primary shortcoming of this style of juicer is that the pulp still retains some liquid, which reduces overall yield.

KIT3_Juicers champion_MG_8374

Food presses:

Food presses or cold-press juicers (also known as masticating juicers) force liquids out mechanically by squeezing food between two hard, unyielding surfaces, one of which is perforated. These machines, which theoretically seem like a medieval torture device for fruits and vegetables, are often preferred by serious juicers because they use less heat. Juice presses are great for softer foods or for foods that have been softened with sugar, enzymes, or a little heat. In some presses, including cider presses, food is placed between flat plates, often between multiple layers of plates. Citrus fruit presses accommodate the shapes of citrus fruits by using convex and concave pressing surfaces. Muscle power fuels juice presses, which causes juice yields to vary depending on the user. If you enjoy pulp in you juice beware— your juice will contain fewer particles because food is compressed, as opposed to being torn or shredded.

KIT3_Juicers press_MG_6835

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Discussion

  1. Steven@healthyarea February 6, 2015 Reply

    This article is very helpful. Yeah, as we all know, drinking juice is an easier way to take in nutrients of fruits and vegetables, sometimes we just do not have too much time to eat an apple bite by bite. The bad side is, the pulp content will be filtered out. So, juicing is an great lifestyle, it could not replace eating fruits directly. Great post, thanks

  2. Conan Bardwell November 27, 2015 Reply

    I knew this wasn’t worth reading when boiling was introduced as less violent than juicing.

  3. shubham khanna January 22, 2016 Reply

    Hi,
    Can i get to know how these cold press plastic bottles are sealed.
    Do they use any kind of sealer or they just fill the bottle manually and close the cork and keep it refrigerated.
    We are a startup in India, looking for your help.
    Thanks

  4. Bheki Nzabe March 26, 2016 Reply

    Hi please advise as to how much of citric acid or one of the preservatives should I add in a 1litre bottle or a 250ml. Thank you for this website, I’m a startup from South Africa.

  5. kojo noah July 28, 2016 Reply

    Hi I want to know how to bottle watermelon juice and how long it can keep thanks

  6. catherine March 6, 2017 Reply

    I would like to know how much citric acid or other preservatives I should put on a 500ml bottle of juice an how much in 250ml of juice.
    Thanks.
    My email is: gingerjuice84@gmail.com

  7. Susie March 11, 2017 Reply

    Starting a natural fruit juice business. I will need your help in what preservative and how much of it in for e.g. in 5litres. Using pineapple, pinneaple skin, lemon grass and lemon. Please contact me-suarkk@yahoo.com

    • Lovette March 25, 2018 Reply

      Please send me your answers . As usual I’m quite confused with the chemistry.

  8. Niyi Ademola March 12, 2017 Reply

    Good day please I want to know how much of sudium benzoate or other preservative , one should add to a litre of green leave extracted juice for a good preservation.

  9. Salomi April 26, 2017 Reply

    I want know the preservative that can a keep a naturally fermented drink fresh 4 a long period of time

  10. Motunrayo May 11, 2017 Reply

    Which of the preservative is the best for Ginger juice.

  11. Motunrayo May 11, 2017 Reply

    Which of the preservative can I use for Ginger juice of one litre

  12. kareebi victor June 5, 2017 Reply

    Good after noon thanks much for this kind of information, i would like to know preservatives that i can use in fruits joice, in my business thanks

  13. Oladele June 7, 2017 Reply

    Good day sir/madam
    Your writeup is so educative. Exactly what I’ve been searching for, for months. Please I’ll like to be enlightened on the quantity of preservative(citric acid) can be used for 25cl, 50cl and 1L bottles. I am a startup. Thank you in anticipation of your response. Email is sunylatsega@yahoo.com

  14. Eddie Sozi June 9, 2017 Reply

    Kindly advise me which preservatives can keep a mixture of pineapple and ginger juice later longer than a month and in which qualities.
    Thanks

  15. Ramakrishna June 13, 2017 Reply

    Hi sir,
    I want to make mango juice for long time storage purpose, please try to send your advice what are the preservatives I will be add, tell me at what pH is suitable for long time storage,

  16. Kalp June 27, 2017 Reply

    Hi I want know about fruit juice preparation and long term storage. Did you provide any classes for it. I am very interested . Thank you

  17. david August 10, 2017 Reply

    Hi, Good day please I want to know the kind of preservatives I would use in preserving juice from tiger but and dates.. and the measurements for 500ml of the juice.

  18. Evelyn September 26, 2017 Reply

    Thank you for this information, please I will like to know the quantity of preservatives(citric acid) I will use for 1litre mix fruit juice.

  19. Vasco October 29, 2017 Reply

    Hi i am interested to produce natural juice, i would like to know how much percentage of lemon juice i should use as preservative.

    Many thanks for the replies

  20. Judith November 6, 2017 Reply

    Hello!! I want to start a juicing business and i would like to know about the preparation, the long term storage, sealing of bottles and the preservatives for mangos, bananas, apples, and oranges please.

  21. Nazri November 15, 2017 Reply

    Hi..I did a homemade juices with lemon/garlic/ginger mix in…It`s only can stay 5 days outside the fridge..what can I do to make it stay longer at outside…what kind of presevative i need to add in.Thanks

  22. Maxwell wealth December 12, 2017 Reply

    Hello… I really want to start a juicing business and I would like to know the kind preservative and measures for preparing fruit juice to last long not being harmful.. Like banana, strawberry, cocktail, pineapple etc. Thanks

  23. Mary January 8, 2018 Reply

    Hello, I want to start a juicing business like pineapple lemonade and ginger lemonade and other types of juice, I would like to know the kind preservatives and measures for preparing for it to last longer

    • Ngwet Umrene April 7, 2018 Reply

      Hello, please i want to know the type of local preservative i can use to store fruit juice for about 2 months.

  24. Fazhir January 25, 2018 Reply

    Hi
    I would love to know if the type of packaging material has anything to do with the storage time of my cocktail. Which material is best for storing juice. Or the shelf life of the juice is entirely dependent on the type of preservatives used!! Thanks for this great document.

    • Joy March 7, 2018 Reply

      Please you had responded to to a question on a your blog and asked How to preserve juice , I am starting a juice business and I need help on how to keep my juice longer. Please help me I really do need your . Thank you so much

  25. Michael February 7, 2018 Reply

    I made vegetable drink how do i preserve it and what preservatives do i use to make last long for public consumption , please help thank you .

  26. norjanah February 12, 2018 Reply

    hi sir! i would like to know how to make a juice that will long for 1 month. thank you 😂

  27. Seyi March 5, 2018 Reply

    Thanks for this piece of information. Please I also want to know the quantity of preaervative like citric acid that can go with 20 littres of watermelon, beetroot, cucumber and pineapple.

    Seyi

  28. Naqiyah March 7, 2018 Reply

    I want to preserve lime mint ginger juice. What type of packaging n preservative would u suggest.

  29. Margaret March 12, 2018 Reply

    What natural preservative can i use for juice and what are the proportion mixtures

  30. DIJKSTEEL LETITIA March 29, 2018 Reply

    Good afternoon can you tell me what preservatives i have to use for coconut syrup ,to keep fresh for a long time.

  31. Freddie April 15, 2018 Reply

    Good day sir/madam
    Your writeup is so educative. Thank you so much for this very piece of information, this is what I’ve been searching for. Please I’ll like to be enlightened on the quantity of preservative(citric acid) can be used for 25cl, 50cl and 1L bottles of orange, pineapple and water melon juice.
    Also I want to knw if sodium benzoate will work perfectly for these types of juice I mentioned . Thank you in anticipation of your response.

  32. sylvester May 17, 2018 Reply

    Hello, please I find your article really helpful. Could you help me with the preservatives for drinks which are extracted from leaves.

  33. tony August 6, 2018 Reply

    The proccess is known as steeping.

    This is a natural chemical reaction with vegetable glycerin. Whenever the ejuice experiences vibrations, the vegetable glycerin will turn darker, and taste sweeter. To avoid this process from happening, store your ejuice in a room temperature environment, away from sunlight and in a place where it won’t be shaken. This will also ensure your ejuice won’t expire as quickly. (e-juice typically expires after 1 year) Never keep e-juice in a car or a bookbag/purse.
    http://bit.ly/2O5u8Hx

  34. Emmanuel. August 8, 2018 Reply

    Compliments of the season sir/ma.
    please i will want to know the best preservatives for mango juice, orange juice and pineapple juice and the quantity to add to 25cl, 50cl, 1L.

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